4th Floor, Irwin House, 118 Southwark Street, London, SE1 0SW
Telephone + 44 (0) 20 7922 8900 Fax + 44 (0) 20 7922 8901
Email: gm@globalmaritime.com Website: http://www.globalmaritime.com
GMOOR
v9.41
GM-44445-0407-37028
c Global Maritime Consultancy Ltd
July 2007
Contents
Contents
i
Figures
xi
1 General Background
1.1
1.2
1.3
1.4
1
Introduction . . . .
Outline of Program
Options . . . . . .
Design Codes . . .
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2 Installation
2.1
2.2
2.3
2.4
2.5
5
Versions . . . . . . . . . . . . . . .
Installation Overview . . . . . . . .
Installation Options . . . . . . . . .
Sentinel Dongle Drivers Installation .
Licensing Checks . . . . . . . . . .
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3 GMOOR Quick Start Guide
3.1
3.2
3.3
3.4
3.5
3.6
3.7
Data Files . . . . . . . . . .
Starting the Program . . . .
Entering Weather Conditions
Changing Line Payouts . . .
Altering Units . . . . . . . .
Printing Results . . . . . . .
Moving an Anchor . . . . . .
5
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6
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4 GMOOR Basics
Page i
1
1
2
3
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11
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15
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18
23
27
GM-44445-0407-37028
Global Maritime
GMOOR
CONTENTS
4.1
4.2
4.3
4.4
4.5
4.6
4.7
The Mooring System
Getting Started . . .
Spread File Selection
Running Gmoor32 . .
Getting Results . . .
Interactive Reports .
Batch Mode . . . . .
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5 Main Screen
35
5.1 Field View . . . . . . . . . . . . . . . . . . . . .
5.1.1 Right Click Menu . . . . . . . . . . . . .
5.1.2 Edit Mooring Line . . . . . . . . . . . .
5.2 Head-Up View . . . . . . . . . . . . . . . . . . .
5.3 Leg View . . . . . . . . . . . . . . . . . . . . .
5.4 Position View . . . . . . . . . . . . . . . . . . .
5.4.1 Note on Reference and Target positions .
5.5 Motion View . . . . . . . . . . . . . . . . . . . .
5.6 Summary1 Tab . . . . . . . . . . . . . . . . . .
5.6.1 Position . . . . . . . . . . . . . . . . . .
5.6.2 Line Tensions . . . . . . . . . . . . . . .
5.6.3 Riser . . . . . . . . . . . . . . . . . . . .
5.7 Wind, Current, Sea & Swell Dials . . . . . . . .
5.8 Summary2 Tab . . . . . . . . . . . . . . . . . .
5.8.1 Tide & Draft . . . . . . . . . . . . . . .
5.8.2 Mean Loads . . . . . . . . . . . . . . . .
5.8.3 Motions . . . . . . . . . . . . . . . . . .
5.9 Files Tab . . . . . . . . . . . . . . . . . . . . . .
5.10 User Options Tab . . . . . . . . . . . . . . . . .
5.10.1 General . . . . . . . . . . . . . . . . . .
5.10.2 Wind . . . . . . . . . . . . . . . . . . .
5.10.3 Wave . . . . . . . . . . . . . . . . . . .
5.10.4 Current . . . . . . . . . . . . . . . . . .
5.10.5 Simulation . . . . . . . . . . . . . . . . .
5.10.6 Cursor Co-ordinates . . . . . . . . . . .
Global Maritime
27
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31
31
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32
33
GM-44445-0407-37028
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36
36
36
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Page ii
GMOOR
CONTENTS
5.11 Transient Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6 File Menu
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
43
New Spread... . . . . .
New Single Leg... . . .
Open... . . . . . . . .
Close . . . . . . . . . .
Save As . . . . . . . .
Import Live Data . . .
Write Results . . . . .
Launch Report... . . .
Print and Print Preview
Print Set-up . . . . . .
Job Details . . . . . .
6.11.1 NOTE . . . . .
6.12 Exit . . . . . . . . . .
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7 Edit Menu
47
7.1 Spread... . . . . . . . . . . . . . . . . . . . .
7.2 Move . . . . . . . . . . . . . . . . . . . . . .
7.2.1 To Target . . . . . . . . . . . . . . .
7.2.2 Change Target . . . . . . . . . . . .
7.3 Zero . . . . . . . . . . . . . . . . . . . . . .
7.3.1 Payout Counters . . . . . . . . . . .
7.3.2 Environment . . . . . . . . . . . . .
7.4 Relay... . . . . . . . . . . . . . . . . . . . . .
7.4.1 Moving the Vessel . . . . . . . . . .
7.4.2 Moving Individual Anchors . . . . . .
7.4.3 Drag and Drop . . . . . . . . . . . .
7.5 Interactive... . . . . . . . . . . . . . . . . . .
7.6 Miscellaneous Options... . . . . . . . . . . .
7.6.1 Paper Size for PDF Reports . . . . .
7.6.2 Disable Non-Matching License Errors
8 Spread Editor
Page iii
44
44
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45
45
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46
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47
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51
GM-44445-0407-37028
Global Maritime
GMOOR
CONTENTS
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Supplying a working title .
Specifying other data les
General parameters . . . .
Leg conguration . . . . .
Editing Leg Types . . . .
Gangway settings . . . . .
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9 Units & Analysis Settings
9.1 Units . . . . . . . . . . . . . . . .
9.2 General . . . . . . . . . . . . . .
9.2.1 Directions . . . . . . . . .
9.2.2 Payouts . . . . . . . . . .
9.2.3 All Other Lengths . . . . .
9.2.4 Forces . . . . . . . . . . .
9.2.5 Reference Grid . . . . . .
9.3 Wind . . . . . . . . . . . . . . . .
9.3.1 Speed . . . . . . . . . . .
9.3.2 Averaging Period . . . . .
9.3.3 Force Calculations at 10m
9.3.4 Gust Factors . . . . . . .
9.3.5 Reference Height . . . . .
9.3.6 Anemometer . . . . . . .
9.3.7 Wind Spectrum . . . . . .
9.4 Wave . . . . . . . . . . . . . . .
9.4.1 Period . . . . . . . . . . .
9.4.2 Spectrum . . . . . . . . .
9.4.3 Spreading . . . . . . . . .
9.4.4 Duration . . . . . . . . .
9.5 Current . . . . . . . . . . . . . .
9.5.1 Data Entry . . . . . . . .
9.5.2 Type . . . . . . . . . . . .
9.5.3 Wind Induced . . . . . . .
9.5.4 Speed . . . . . . . . . . .
9.5.5 Direction Convention . . .
Global Maritime
52
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Page iv
GMOOR
CONTENTS
9.6
9.7
9.8
9.9
9.10
9.5.6 Depth Units . . . . . . . . .
9.5.7 View/Edit . . . . . . . . . .
9.5.8 Direction Relative To Wind
9.5.9 Mixing Layer Thickness . . .
Code . . . . . . . . . . . . . . . . .
Default Values . . . . . . . . . . . .
Simulation . . . . . . . . . . . . . .
9.8.1 Simulation Period . . . . . .
9.8.2 Time Step . . . . . . . . . .
Consequence . . . . . . . . . . . .
9.9.1 Line Tension . . . . . . . .
9.9.2 SlipJoint Stroke . . . . . . .
9.9.3 Upper FJ Angle . . . . . . .
9.9.4 Lower FJ Angle . . . . . . .
9.9.5 Oset . . . . . . . . . . . .
Beaufort Scale . . . . . . . . . . . .
9.10.1 Wind Description . . . . . .
9.10.2 Sea Height . . . . . . . . .
9.10.3 Period . . . . . . . . . . . .
9.10.4 Wind Speed . . . . . . . . .
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10 View Menu
69
10.1 Status Bar . . . . . . . . . . . .
10.2 Toolbars . . . . . . . . . . . . .
10.2.1 Standard . . . . . . . .
10.2.2 Edit . . . . . . . . . . .
10.2.3 View . . . . . . . . . . .
10.2.4 Graph . . . . . . . . . .
10.2.5 Field . . . . . . . . . . .
10.2.6 Rings . . . . . . . . . .
10.2.7 Rings Current . . . . . .
10.2.8 Zoom In & Zoom Out .
10.2.9 Close Up & Wide Angle
10.3 Settings . . . . . . . . . . . . .
Page v
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GM-44445-0407-37028
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69
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71
Global Maritime
GMOOR
CONTENTS
10.3.1
10.3.2
10.3.3
10.3.4
Colour Settings . .
Rings Settings . .
Field View Options
Force Summary . .
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11 Guidance Menu
72
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73
11.1 Guidance Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
11.2 Guidance Results Screen . . . . . . . . . . . . . . . . . . . . . . 74
12 Interactive Dialog
77
12.1 General . . . . . . . . . . . . . . .
12.1.1 Case Title . . . . . . . . . .
12.1.2 Time Label . . . . . . . . .
12.1.3 Water Depth, Draft & Tide
12.1.4 Forces . . . . . . . . . . . .
12.2 Weather . . . . . . . . . . . . . . .
12.2.1 Beaufort . . . . . . . . . . .
12.2.2 Summary . . . . . . . . . .
12.2.3 Wind Speed . . . . . . . . .
12.2.4 Sea & Swell Wave Height .
12.3 Current . . . . . . . . . . . . . . .
12.3.1 Surface Current . . . . . . .
12.3.2 Current Prole . . . . . . .
12.4 Force (Extra Force) . . . . . . . . .
12.4.1 Axis System . . . . . . . . .
12.4.2 Radial or Cartesian . . . . .
12.4.3 Force & Direction . . . . . .
12.4.4 Longitudinal & Transverse .
12.4.5 Moment . . . . . . . . . . .
12.5 Motion (Extra Motion) . . . . . . .
12.5.1 Axis System . . . . . . . . .
12.5.2 Co-ordinates . . . . . . . .
12.5.3 Excursion & Direction . . .
12.5.4 Longitudinal & Transverse .
Global Maritime
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78
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Page vi
GMOOR
CONTENTS
12.5.5 Yaw . . . . . . . . . . . . . . . . . . . .
12.6 Legs . . . . . . . . . . . . . . . . . . . . . . . .
12.6.1 Line . . . . . . . . . . . . . . . . . . . .
12.6.2 Status . . . . . . . . . . . . . . . . . . .
12.6.3 Modify Line Status . . . . . . . . . . . .
12.6.4 Payout & Tension . . . . . . . . . . . . .
12.6.5 Change . . . . . . . . . . . . . . . . . .
12.6.6 Value & Units . . . . . . . . . . . . . . .
12.6.7 Show the Initial Payout & Mean Tension
12.6.8 Units . . . . . . . . . . . . . . . . . . .
12.7 Thrusters . . . . . . . . . . . . . . . . . . . . .
12.7.1 Mode . . . . . . . . . . . . . . . . . . .
12.7.2 Manual Mode . . . . . . . . . . . . . . .
12.7.3 Modify . . . . . . . . . . . . . . . . . . .
12.7.4 Individual Modify . . . . . . . . . . . . .
12.7.5 Joystick Modify . . . . . . . . . . . . . .
12.8 Riser . . . . . . . . . . . . . . . . . . . . . . . .
12.8.1 Connection . . . . . . . . . . . . . . . .
12.8.2 Top Tension . . . . . . . . . . . . . . . .
12.8.3 Mud Weight . . . . . . . . . . . . . . . .
12.9 Vessel . . . . . . . . . . . . . . . . . . . . . . .
12.10Control . . . . . . . . . . . . . . . . . . . . . .
12.10.1 Position . . . . . . . . . . . . . . . . . .
12.10.2 Redene Target . . . . . . . . . . . . . .
12.11Analysis . . . . . . . . . . . . . . . . . . . . . .
12.11.1 Failure . . . . . . . . . . . . . . . . . . .
12.11.2 Dynamic Analysis . . . . . . . . . . . . .
12.11.3 LF Frequency Domain . . . . . . . . . .
12.11.4 LF Time Domain . . . . . . . . . . . . .
13 Batch Menu & Batch Dialog
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83
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13.1 New - User Dened . . . . . . . . . . . . . . . . . . . . . . . . . 93
13.1.1 Batch Control Dialog . . . . . . . . . . . . . . . . . . . . 93
13.2 New - Forecast Based . . . . . . . . . . . . . . . . . . . . . . . . 99
Page vii
GM-44445-0407-37028
Global Maritime
GMOOR
CONTENTS
13.3 Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
14 Graphs Menu
14.1
14.2
14.3
14.4
14.5
14.6
101
Vessel Excursion and Point graphs
Catenary Prole . . . . . . . . . .
Line Load Excursion . . . . . . . .
Vessel Load Excursion . . . . . . .
Point . . . . . . . . . . . . . . . .
Save Graph As . . . . . . . . . .
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15 Data Files
15.1
15.2
15.3
15.4
15.5
15.6
15.7
15.8
15.9
105
Introduction . . . . . . . . . . .
The SPREAD (*.SPD) File . . .
Example SPREAD (*.SPD) File
The VESSEL Files . . . . . . .
Example PLAN (*.PLN) File . .
The FIELD (*.FLD) File . . . .
Example FIELD (*.FLD) File . .
Example Body File (jacket.bod)
The RISER (*.RSR) File . . . .
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A GMOOR Technical Notes
A.1 GMOOR32 - Notes on Computational Background and Models .
A.2 Equilibrium of the Moored Vessel . . . . . . . . . . . . . . . . . .
A.3 Environmental Loads . . . . . . . . . . . . . . . . . . . . . . . .
A.3.1 Wind Forces . . . . . . . . . . . . . . . . . . . . . . . . .
A.3.2 Current Forces . . . . . . . . . . . . . . . . . . . . . . .
A.3.3 Wave Forces . . . . . . . . . . . . . . . . . . . . . . . .
A.4 Estimation of Slow Drift Response . . . . . . . . . . . . . . . . .
A.4.1 Frequency Domain . . . . . . . . . . . . . . . . . . . . .
A.4.2 Time Domain . . . . . . . . . . . . . . . . . . . . . . . .
A.5 Static Catenary Theory . . . . . . . . . . . . . . . . . . . . . . .
A.6 Catenary Dynamics . . . . . . . . . . . . . . . . . . . . . . . . .
A.7 Slowly varying Wind Forces and Wind Spectra used in GMOOR32
A.7.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . .
Global Maritime
101
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104
GM-44445-0407-37028
105
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128
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142
144
145
145
Page viii
GMOOR
CONTENTS
A.7.2 Wind force spectral density . . . . . . . .
A.7.3 Harris (Ref 1) . . . . . . . . . . . . . . .
A.7.4 API RP2A / ISO 13819-2:1995E (Ref 2)
A.7.5 Ochi and Shin (Ref 1) . . . . . . . . . .
A.7.6 NPD (Ref 3) See NORSOK N-003 . . .
A.8 Comparison of Spectra . . . . . . . . . . . . . .
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B Wave Spectra
145
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149
151
B.1 JONSWAP Spectrum . . . . . . . . . . . . . . . . . . . . . . . . 151
C Software Protection System
C.1
C.2
C.3
C.4
C.5
C.6
C.7
C.8
Overview . . . . . . . . . . . . . . . . . . . . . . . . .
License Files . . . . . . . . . . . . . . . . . . . . . . .
Conguration Overview . . . . . . . . . . . . . . . . .
Stand-Alone License Installation and Conguration . .
Typical Stand-alone licensing Problems . . . . . . . .
Network License Installation and Conguration . . . .
Network Licensing Tips . . . . . . . . . . . . . . . . .
Network License Server Installation and Conguration .
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155
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D Software License Agreement
163
E Output Database
171
E.1 Overview . . . . . . . . . .
E.2 Database Tables . . . . . .
E.2.1 Clearance . . . . .
E.2.2 Compnt Table . . .
E.2.3 CompntRes Table .
E.2.4 JobDet Table . . .
E.2.5 LineDyn Table . .
E.2.6 LineRes . . . . . .
E.2.7 Loads Table . . . .
E.2.8 Motions Table . .
E.2.9 Options Table . . .
E.2.10 Position Table . . .
Page ix
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GM-44445-0407-37028
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171
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172
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182
184
186
187
189
Global Maritime
GMOOR
CONTENTS
E.2.11
E.2.12
E.2.13
E.2.14
RunDet Table .
Spread Table .
Thrust Table .
Vessel Table . .
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F References
Global Maritime
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190
191
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195
GM-44445-0407-37028
Page x
List of Figures
Page xi
2.1
2.2
2.3
2.4
2.5
Installation First Screen . . . . . . . . . . . . . .
Installation License Agreement . . . . . . . . . .
Installation Destination . . . . . . . . . . . . . .
Sentinel Dongle Drivers Installation First Screen .
Sentinel Dongle Drivers Installation Options . . .
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6
7
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8
9
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14
3.15
3.16
3.17
3.18
3.19
Data File Structure . . . . . .
Splash Screen . . . . . . . . .
Start Screen . . . . . . . . . .
File Open . . . . . . . . . . .
Main Screen Zoomed In . . . .
Main Screen Zoomed Out . .
Edit Interactive Selection . . .
Edit Interactive Dialog . . . .
Weather Tab . . . . . . . . .
Main Screen Solved . . . . . .
Leg Tab . . . . . . . . . . . .
Line Details Box . . . . . . . .
Interactive Mode Box . . . . .
Leg Tab with Payout Changed
Units Selection . . . . . . . .
Units Dialog . . . . . . . . . .
Write Results . . . . . . . . .
Launch Report . . . . . . . . .
Report Selection . . . . . . . .
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12
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GM-44445-0407-37028
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Global Maritime
GMOOR
LIST OF FIGURES
3.20
3.21
3.22
3.23
3.24
3.25
Report Selection Dialog . . . . .
Run ID Selection . . . . . . . .
Preview of Report . . . . . . . .
Relay Selection . . . . . . . . .
Relay Dialog . . . . . . . . . . .
Dropped Anchor - Relay Dialog .
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22
23
23
24
24
25
4.1
4.2
4.3
4.4
The Mooring System
Vessel Axis System .
Plan View Of Vessel .
Global Axis System .
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27
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29
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5.1 Main Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.1 File Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.2 Job Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.1 Edit Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2 Miscellaneous Options Dialog . . . . . . . . . . . . . . . . . . . . 50
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
Spread Editor - Step 1 . . . . . . .
Spread Editor - Step 2 . . . . . . .
Spread Editor - Step 3 . . . . . . .
Spread Editor - Step 4 . . . . . . .
SpreadEditor - Edit Leg Types . . .
SpreadEditor - Component Details .
SpreadEditor - Suggest Component
Spread Editor - Step 5 . . . . . . .
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52
53
53
55
55
56
56
57
9.1 Beaufort Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.1 View Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
11.1 Guidance Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
11.2 Guidance Results Screen . . . . . . . . . . . . . . . . . . . . . . 74
11.3 Guidance Graphical Results . . . . . . . . . . . . . . . . . . . . . 75
12.1 Edit Interactive Selection . . . . . . . . . . . . . . . . . . . . . . 77
Global Maritime
GM-44445-0407-37028
Page xii
GMOOR
LIST OF FIGURES
13.1
13.2
13.3
13.4
13.5
13.6
13.7
13.8
Batch Menu . . . . . . . . . . . . . . . .
Batch Control Dialog . . . . . . . . . . .
Batch Case Generator . . . . . . . . . . .
Batch Case Generator - stage 1 . . . . .
Batch Case Generator - stage 2 . . . . .
Batch Case Generator - stage 3 . . . . .
Batch Case Generator - alternate method
Batch Case Generator - special directions
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93
94
95
96
97
97
98
98
14.1 Graphs Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
C.1
C.2
C.3
C.4
Page xiii
Help-licensing dialog showing local license le
USB and Parallel port dongles . . . . . . . .
Evaluation mode warning . . . . . . . . . . .
Help-licensing in standalone mode . . . . . .
GM-44445-0407-37028
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156
158
158
159
Global Maritime
Chapter 1
General Background
1.1 Introduction
The GMOOR program simulates the behaviour of catenary moored vessels and
analyses the performance of mooring systems. The program was rst developed
by Global Maritime in 1982 as an in-house design tool for both inshore and oshore
moorings. It was rst released for licensed third party use in 1986 and since then
has been installed in over 40 sites worldwide including design oces, marine drilling
departments and on drilling and production vessels oshore. At the time of writing
the latter include the Amerada Hess AH001 FPF on Ivanhoe/Rob Roy, Santa FE
Rigs 135 and 140, and the Sedco 706 in tender assist mode for Total's Dunbar
eld.
Norwegian Maritime Directorate (NMD) has approved GMOOR by for quasi-static
mooring analysis (water depths up to 450m). This approval was rst awarded in
1987. The test cases submitted in 1987 form part of the QA procedures followed
prior to issue of each release of the program to demonstrate continued compliance.
GMOOR32 is a Windows based version of GMOOR with additional features including station-keeping analysis incorporating the marine drilling riser.
1.2 Outline of Program
Winds, waves and currents cause loads on a vessel which would, in the absence
of a mooring system or propulsion, cause the vessel to drift. The purpose of
the mooring system, aided by thrusters if necessary, is to maintain the vessel on
location. The basic problem solved by GMOOR32 is nding the response of the
moorings to the applied environmental loads and motions.
The objective of mooring analysis is to ensure that the moorings are t for purpose.
This includes checking that they are strong enough to prevent the vessel breaking
free or dragging anchors in Survival Conditions and that they can take reasonably
severe weather conditions without the need to suspend operation - Operating
Page 1
GM-44445-0407-37028
Global Maritime
GMOOR
CHAPTER 1. GENERAL BACKGROUND
Conditions.
The objective of simulation onboard is to determine the likely station keeping
behaviour of the vessel under changing weather conditions and to investigate the
probable eect of various mooring management activities such as line adjustment
(winch operation) and/or the use of thrusters. In addition the program can also
perform consequence analysis - investigating what would happen to vessel position,
line clearances, and line tensions in the event of a single failure. This failure may be
of a mooring line, a single thruster or a group of thrusters. In this way GMOOR32
can also give guidance on mooring system adjustment to attain a particular target
position and/or minimise extreme tensions or excursions. When the riser is included
GMOOR32 can be used in a similar way to determine the operating limits of critical
riser components.
1.3 Options
Gmoor32 is now supplied as one of three program options. The options have
varying levels of capability as described below.
Gmoor32M Multi-component lines, environment applied as force/moment
Gmoor32Q As Gmoor32M, but can use CVF les with environment input as
weather
Gmoor32D As Gmoor32Q, with additional dynamic analysis of mooring lines
Options M and Q use the quasi-static mooring analysis method which assumes
that the vessel takes up a mean oset where the moorings exactly balance the
mean environmental loads (force and torque) and oscillates about this mean position in response to wave forces. The analysis method assumes that wave-induced
surge, sway and yaw motions of the vessel (at wave periods, typically from 4 to 20
seconds) are not aected by the mooring system. These assumptions are reasonable for all large vessels with typical chain or wire moorings in water depths up to
450m (1500ft) and are accepted and widely used by both certication authorities
and designers.
Gmoor32M calculates the mean and maximum line tensions, maximum anchor
loads, maximum and minimum lengths of grounded line and vessel excursions
for multi-leg catenary mooring systems including the eects of seabed friction,
seabed slope and non-linear line elasticity. The calculation of transient motion
following sudden line failure is also included and eld features at the mooring
location are graphically displayed. Gmoor32M can handle multi-component lines
with intermediate buoys or sinkers.
Gmoor32Q allows the use of a Custom Vessel File (CVF). This le contains wind,
current, and wave drift force coecients, and motion RAOs for a particular vessel.
The environment can be entered as wind speed, wave height, etc, and Gmoor32Q
will calculate the environmental loads and motions acting on the vessel. Another
Global Maritime
GM-44445-0407-37028
Page 2
GMOOR
CHAPTER 1. GENERAL BACKGROUND
advantage of the CVF is that low frequency (second order) motions can be calculated and included in the quasi-static analysis.
Used in conjunction with RISERDYN, Global Maritime's in-house riser analysis
program, Gmoor32Q can analyse moorings with a marine drilling riser present to
calculate the prole of the riser and the interaction with the vessel.
Gmoor32D, extends the program's capability to include line dynamics. The method
used for the dynamic analysis assumes that the steady environmental loads and
the low frequency motions can be applied statically to give a mean oset. The
vessel motions at the fairleads are then calculated and applied to the mooring
lines. A frequency domain technique is used to determine the dynamic tensions
taking account of drag and inertia forces. A more detailed description of the
technique used for the dynamic analysis is contained in Global Maritime report
GM-33053-1299-37055.
Where features are specic to a particular program option this is identied in the
manual.
1.4 Design Codes
Codes of Practice, Guidelines and/or Rules have been published by the American Petroleum Institute (API RP2P, RP2SK), Norwegian Maritime Directorate
(NMD Rules and Guidelines), Det Norske Veritas (DNV-OS-E301 which replaced
POSMOOR Classication Rules) and Lloyds Register of Shipping. There are also
guidelines in preparation by the IMO.
Gmoor32 has been designed to enable code checking to API RP2SK, DnV-OSE301 and DnV POSMOOR. However, this code checking must be treated with
caution as most of the above codes and, just as signicantly, their interpretation
are subject to change.
Mooring codes prescribe 4 main elements
Input:
Design Environmental Criteria
Performance Criteria: Allowable Line Tensions and Vessel Oset
Permitted Adjustment: Active Control of Line Tensions and Thrusters
Method:
Analysis Technique (Quasi-static or Dynamic)
The exibility designed into the program will allow designers to implement their
own interpretations of the various rules and codes.
In addition to mooring constraints, limits are set by other vessel equipment such as
the marine riser on drilling rigs. Often it will be necessary to run a mooring analysis
in conjunction with a riser analysis to determine the optimum mooring pretensions
for operating conditions. It is stressed that it is the user's responsibility to check
that the criteria used are current, appropriate and valid.
It is suggested that you obtain copies of the latest versions of codes you intend
to use and keep these, together with summaries of any additional criteria your
company applies, with this manual for reference purposes.
Page 3
GM-44445-0407-37028
Global Maritime
GMOOR
Global Maritime
CHAPTER 1. GENERAL BACKGROUND
GM-44445-0407-37028
Page 4
Chapter 2
Installation
2.1 Versions
The following versions of the program are available
Gmoor32M
Gmoor32Q
Gmoor32D
In addition, the program will run in an unlicensed mode as what is referred to
as GMOOR32S, which can only open the demo les which get installed with the
program
There is a utility program, MAKECVF, which always gets installed along with
GMOOR. MAKECVF however, requires a separate license le in order to run.
The installation executable is the same for all versions of the program, the option
that is enabled is triggered by a separate license le.
2.2 Installation Overview
In order to install GMOOR you will need the following :Page 5
GM-44445-0407-37028
Global Maritime
GMOOR
CHAPTER 2. INSTALLATION
Installation Program Exectutable This will be either supplied on a CD
or downloaded from http://support.
globalmaritime.com. The executable will
typically have the version number as part of
the name (eg GMOOR v9409c full.exe)
Dongle Drivers
In standalone licening mode, GMOOR is protected by a security dongle (normally USB).
This dongle requires drivers to be installed in
order to operate it. the driver installation is
separate from the GMOOR program installation. You do not need to install the dongle
drivers for the network licensing version.
License File
In standalone licensing mode, a license le
needs to be copied into the GMOOR program
folder after running the install program. The
license le will normally be e-mailed to you.
It is also normally available for download on
the client support web site http://support.
globalmaritime.com if you log in using your
client specic username and password. You do
not need a local license le if you are using network licensing
2.3 Installation Options
The installation begins with start screen shown in gure 2.1
Figure 2.1: Installation First Screen
You can normally take the defaults for all the program options shown during the
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installation, however a couple of screens are noteworthy
Figure 2.2: Installation License Agreement
The license screen (gure 2.2) displays the GMOOR license agreement. By proceeding beyond that screen you are accepting the license terms and conditions
so it is advisable to review them if you have not doewn so already. You should
have been supplied with a copy of the license agreement with your enquiry for the
program. It is also at the back of this manual
The Installation Destination screen (2.3) displays the folder where GMOOR will
be installed. This by default is fProgram Filesg
Global Maritime
Gmoor32. fProgram Filesg is normally on your C: drive but may be elsewhere if
your IT department has moved it.
Once the program has been installed, then if you are using standalone mode you
should copy the license le into the program folder - location as noted during the
installation process.
2.4 Sentinel Dongle Drivers Installation
The sentinel dongle drivers currently have their own installation program (g 2.4).
If you use only a license server and don't have either the usb or parallel port
dongles, then you don't need to install the drivers.
As with all drivers, you will need to have local admin rights on your computer to
run the installation.
There are separate drivers for usb and parallel port dongles. By default both are
installed (see 2.5 )so it is safe just to take the default options. TipIf you only
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Figure 2.3: Installation Destination
have a USB dongle, then you will need to install the parallel driver as well, as it
seems to be required for it to function, for some reason.
Figure 2.4: Sentinel Dongle Drivers Installation First Screen
2.5 Licensing Checks
Having done all the above, if the program starts up and says \Starting in Evaluation
Mode", then something is wrong with the licensing.
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Figure 2.5: Sentinel Dongle Drivers Installation Options
The best place to go to diagnose the problem is the Help-licensing dialog within
GMOOR. This is discussed further in Appendix C.2
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Chapter 3
GMOOR Quick Start Guide
We will rst describe the data le structure used by the program and then lead the
user through a simple analysis. The methods used to apply weather conditions,
change line payouts, move anchors, etc, will all be covered.
3.1 Data Files
The data le structure used in Gmoor32 is shown in gure 3.1
The Spread File is the main driving le for the mooring analysis. This le contains
data for the anchor layout, line make-up, and water depth. The Spread File also
calls other les including a le containing details of the vessel.
There are two dierent ways in which vessel data can be input. A Custom Vessel
File (CVF) contains details of fairleads positions, displacement and draughts plus
wind, wave and current force coecients and motion RAOS. An ordinary vessel le
(VSL) contains only fairlead positions, displacement and draughts. The advantage
of a CVF is that when Gmoor32 is run weather conditions can be input directly
by wind speed, wave height, etc, and Gmoor32 will automatically calculate the
environmental loads and motions. A VSL le on the other hand requires that the
loads and motions and already known and the forces and osets must the entered
directly.
The Field File (FLD) is used to represent the eld layout. This may consist of
pipelines, platforms, etc, and aids the user to visually identify no-anchor areas and
obstructions. If the anchoring area is clear of all obstructions then this le can be
omitted. The Body File (BOD) is used by the Field File to represent individual
items, such as a platform or jack-up.
Certain users may have purchased the optional integrated riser package. If they
have then the riser make-up is dened in the Riser File (RSR).
The manual contains a full description of the data le structures.
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Figure 3.1: Data File Structure
3.2 Starting the Program
Gmoor32 can be started either by clicking on the Icon on the desktop or by the
standard Windows Start/Programs menu.
Figure 3.2: Splash Screen
The program will take several seconds to start up. A splash screen will appear
briey (g 3.2), followed by the main start screen (g 3.3).
A spread le must now be opened by clicking on File/Open (g 3.4).
Once the correct directory is found click on the desired spread le and Gmoor32
will open it and show the default window.
In this case the le Istiglal CVF.SPD is selected and the screen shown in gure
3.5 is displayed.
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GMOOR
Figure 3.3: Start Screen
Figure 3.4: File Open
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Figure 3.5: Main Screen Zoomed In
This screen shows the mooring system layout and the payout and mean tension of
each line is indicated. The weather dials show that no weather has been applied.
To view the anchor locations the wide angle view can be selected via the View
menu, producing the layout show in gure 3.6.
Figure 3.6: Main Screen Zoomed Out
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3.3 Entering Weather Conditions
Gmoor32 can be run in either interactive or batch mode. New users should rst
familiarise themselves with running the program interactively. Once this has been
done the batch mode is relatively straightforward as it is based on multiple interactive runs.
To enter the interactive mode select Edit/Interactive (g 3.7).
Figure 3.7: Edit Interactive Selection
A dialogue box (g 3.8) will appear which can be used for entering weather conditions, altering payouts, changing draft or vessel position. Each time the Interactive
Mode dialogue box is exited by clicking the OK button Gmoor32 will solve and a
new equilibrium position found.
For example, select the Weather tab (g 3.9) and click the Beaufort Enabled
check box. Now enter 9 in the Beaufort Force box and click OK.
Gmoor32 now solves and shows new line tensions and vessel position (g 3.10).
Line status, tensions and grounded lengths are shown on the Leg Tab (g 3.11)
on the main screen. The other tabs on the main screen show: a head-up view with
mean line tensions and mean environmental loads, the mean position of the vessel
and the oset from the target or reference position, details of vessel motions in
all six degrees of freedom.
3.4 Changing Line Payouts
To alter line payouts the Interactive Mode dialogue box should be reopened and
the Legs tab selected. Double click on a line number (you must highlight a line
number in the left most column) and a Line Details box will appear. This box
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Figure 3.8: Edit Interactive Dialog
Figure 3.9: Weather Tab
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GMOOR
Figure 3.10: Main Screen Solved
Figure 3.11: Leg Tab
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allows you to change the status of the line by breaking it for a static single line
failure case, adjusting payout, or adjusting tension (g 3.12).
Figure 3.12: Line Details Box
In gure 3.13, case Line 1 was selected and the payout changed by 10 metres and
the Line Details box quit by clicking OK. Now click OK on the Interactive Mode
box and Gmoor32 will resolve and give new line tensions
The resulting line tensions, etc, are shown in the Leg tab in the main screen. The
change in payout of line 1 is clearly indicated in gure 3.14.
There is a quick way of changing payouts or line status.
Just double click on a mooring line on the main screen.
3.5 Altering Units
It is possible to alter the units in which Gmoor32 is working at any time during an
analysis. Select the Options menu from the main Edit menu and click on Units
(g 3.15).
A dialogue box appears in which a number of default values can be altered. The
units for force, length and payouts are on the general tab. The other tabs allow
for changes from knots to m/s to ft/s for wind and current speed. The design
code to be used in batch runs can be selected here also (g 3.16).
3.6 Printing Results
Print out of results is obtained via a database le. In order to have results to print
they must rst be written to the database. Selecting the Write Results command
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GMOOR
Figure 3.13: Interactive Mode Box
Figure 3.14: Leg Tab with Payout Changed
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Figure 3.15: Units Selection
Figure 3.16: Units Dialog
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from the File menu does this (g 3.17). The present set-up, weather conditions
and units will be written to a series of text les in a subdirectory of the Spread
File directory.
Figure 3.17: Write Results
To preview the printed output select the Launch Report command from the File
Menu (g 3.18).
Figure 3.18: Launch Report
A dialogue box will appear giving a choice of report types (g 3.19). Current view
will give a graphical printout of the spread arrangement. Anchor locations gives a
one page report detailing the anchor range and bearings from the vessel position.
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see the manual for more information. Component details gives a report showing
the make-up of each mooring line. And nally the Detailed Output gives a report
of each analysis case written to the database.
Figure 3.19: Report Selection
In the example shown in gure 3.20 we choose the Detailed Output report and
click OK.
Figure 3.20: Report Selection Dialog
Once a number of runs have been written to the database it is possible to either
select them all for output or they can be printed individually. In this case (g 3.21)
we have only written one set of results so clicking Run ID 1 will give us the results
we want.
Acrobat Reader (or your preferred PDF viewer) will appear showing a preview of
the output (g 3.22). Maximising the window will allow the user to view the
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Figure 3.21: Run ID Selection
results before printing.
Figure 3.22: Preview of Report
3.7 Moving an Anchor
The eect of moving an anchor can be investigated by using the Edit/Relay menu
(g 3.23).
A box (see gure 3.24) appears showing the present vessel and anchor positions.
Editing the numbers in the boxes allows the anchors to be relayed. The Apply
button will move an anchor and keep the Relay box open, the OK button moves
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Figure 3.23: Relay Selection
the anchor and closes the box.
Figure 3.24: Relay Dialog
A quick way of moving an anchor is to go to the wide-angle view and drag and
drop the anchor in the desired location. The Relay box will appear and give you
the chance to cancel or ne tune the move as required (g 3.25).
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Figure 3.25: Dropped Anchor - Relay Dialog
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Chapter 4
GMOOR Basics
4.1 The Mooring System
Figure 4.1: The Mooring System
The mooring system comprises of a number of mooring lines attached at one
end to the vessel, usually via some form of winch system, and at the other to
a drag anchor or pile embedded in the seabed. On a semi-submersible vessel,
as illustrated in Figure 4.1, the mooring lines lead from anchors through pulley
wheels to a tensioning device. The pulley wheels are known as FAIRLEADS and
the tensioners as LIFTERS, WINDLASSES or WINCHES.
The mooring lines may be made up from various sizes of CHAIN, WIRE ROPE
or SYNTHETIC FIBRE ROPE or a mixture of these arranged as a series of components. Between each component there may be a heavy weight (SINKER), a
BUOY, or just a shackle whose weight may usually be neglected.
If the vessel position varies slowly, the forces exerted by the water on the mooring
lines may be neglected and the tension depends only upon the line properties of
WEIGHT PER UNIT LENGTH, the LINE LENGTH (PAYOUT) and the distance
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(RANGE) from the anchor to the fairlead. The stretch of the mooring lines may
also be important especially at high tensions or if the material is very exible thus we must also consider the ELASTICITY. The dynamic eects due to drag
as lines are lifted through the water by surge and sway motions of the vessel are
normally ignored in quasi-static analysis. The safety factors on line tensions are
assumed to take account of this approximation, at least in water depths up to
450m according to common practice in the North Sea. Beyond this water depth a
dynamic analysis becomes essential and a dierent technique must be employed.
This is discussed in more detail in the section on dynamic analysis.
The eects of the moorings on the vessel depend upon where the lines are attached
to the vessel, the directions of the lines and the tensions. The direction of each
line is controlled by the placing of the anchors - the ANCHOR PATTERN. Usually
a symmetric pattern is desirable but often the constraints of eld architecture
(platforms, pipelines, and other vessels) force highly asymmetric arrangements.
Figure 4.2: Vessel Axis System
The axis convention Gmoor32 uses for dening points on the vessel is shown in
Figure 4.2. The co-ordinate system is right handed with X positive to Starboard,
Y positive Forward and Z positive upward - it has been chosen this way so that a
'head-up' display has Y vertical and X to the right. The origin for the vessel axis
system is the plan position of the centre of gravity at the keel. You may normally
assume that the centre of gravity is on the centreline amidships. This axis system
is the VESSEL AXIS SYSTEM and moves with the vessel.
Figure 4.3 shows a plan view of a vessel - this is equivalent to the 'head-up' display
referred to earlier. This plan view is described in vessel les so that it can be drawn
and shown in relation to both target position and adjacent eld features.
Figure 4.4 shows the co-ordinate system used for dening the anchor positions
relative to the earth - this is the GLOBAL AXIS SYSTEM and should normally
be with the UTM grid for the location. There may a dierence (albeit small)
between the vessel headings dened relative to grid and true North. The origin of
the global axis system is termed the FIELD ORIGIN.
The vessel's position in the eld is dened by the location of the origin of the
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Figure 4.3: Plan View Of Vessel
Figure 4.4: Global Axis System
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VESSEL AXIS SYSTEM in these GLOBAL or FIELD COORDINATES - this
point is termed the TARGET POSITION of the vessel and would be over the
wellhead for a drilling vessel. The position includes Easting (X), Northing (Y)
and heading. Note that the heading is dened as the angle measured (positive
clockwise) from the GLOBAL Y axis to the VESSEL Y axis as shown in Figure 4
(a positive moment will reduce heading).
Anchor positions may be dened in a number of ways; practically the positions
are often uncertain, the precision is rarely better than 5m, often worse. Gmoor32
therefore permits the positions to be dened in a number of dierent ways. In
the rst instance suppose that the anchor locations are known precisely, Gmoor32
allows these absolute positions to be dened in one of two ways:
In GLOBAL COORDINATES Range and Bearing relative to the TARGET POSITION or in VESSEL COORDINATES Range and Bearing from each individual
FAIRLEAD.
It is also possible to dene the anchor position indirectly by specifying the bearing
of the anchor from the Target position and mooring line payout and tension. This
is commonly the best way to reconcile measured and predicted tensions onboard
although caution is required as far as the accuracy of line tension and payout
meters is concerned.
The make-up of the mooring lines is dened by the properties and arrangement
of a number of components, most frequently just one - e.g. 76mm chain. The
convention for line component numbering is the rst component is always at the
anchor and the last component at the vessel. When Gmoor32 displays a catenary
prole it is normally shown as: Anchor to the Left and Vessel to the Right.
Before you can run a Gmoor32 simulation the program needs to be told the geometry of the mooring system and mooring line properties, the vessel characteristics
and, if you wish to see the mooring arrangement with location specic features, a
plan of the eld. Also if you want to include the riser in the analysis the physical
and dynamic properties of the riser need to be included. This information is identied in data les whose format is particular to Gmoor32 - this manual explains
these in detail later. The basic le, which denes the anchor pattern and identies
three other les that describe the vessel, eld plan and riser, is called the SPREAD
FILE. All Gmoor32 simulations start by selecting the SPREAD FILE to be used.
We shall assume at rst that the vessel characteristics have been dened in a special kind of le called a CUSTOM VESSEL FILE (CVF). These les describe the
way the wind, waves and current generate forces acting on the vessel, requiring
that the user only dene the weather conditions (wind speed, wave height, wave
period and current speed) - the vessel loads and motions are calculated automatically. The CVF also contains details of the vessel's geometry, mass and damping
characteristics.
If the version of the program you have does not support CVFs, or you do not
have a CVF for the vessel of interest, then a VSL le can be used. The VSL le
contains details of the vessel's fairlead positions, and the vessel's geometry, mass
and damping characteristics. The environmental loads and motions acting on the
vessel must be pre-calculated.
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The program is run interactively - once the data les have been set up on disk all
further input is via the keyboard/mouse. For most of the time the user will see
a main screen display giving a visual representation of the vessel at the location
with a summary of the riser loads and components, vessel position, mooring lines
and weather conditions acting upon the vessel. Load cases and mooring system
adjustments can all be changed by the PULL DOWN MENU's (or ICON's) on the
main screen (Field View). The structure of these is described below.
4.2 Getting Started
To run Gmoor32 simply select the Gmoor32 icon in the Start Menu or double-click
the icon on desktop and an initialisation screen will appear.
To open a Spread File, the Gmoor32 initialisation le, select the Open command
from the File Menu. Alternatively the user can press the Open icon on the Standard
Toolbar which will also initialise the Open Window.
4.3 Spread File Selection
The Open Window will default to the Gmoor32 directory produced in the installation procedure, where the example le G32 EXAM.SPD is located.
The default le type for the Open Window is *.SPD. Gmoor32 will open existing
Spread Files produced for previous versions of GMOOR but will not open any other
form of le. A le in an alternative location may be chosen using the standard
Windows commands. Once the Spread File has been selected Gmoor32 will begin
to initialise the spread layout, showing an Initialisation Window giving a display of
the progress. This will take between 5 and 20 seconds depending on the speed of
your PC.
Once the initialisation is complete the main screen will appear with the Field View
open showing the vessel and the mooring system layout. The Field View window
defaults to the close up view as dened in the Spread File. The line payouts and
mean tensions are shown on the Field View with the mooring system in equilibrium.
4.4 Running Gmoor32
To run an analysis two options are available; Interactive or Batch. For the new
user the Interactive option should be used rst to get a feel for how Gmoor32
is congured. The Batch option is similar to Interactive, but allows numerous
analyses to be run automatically.
Start the Interactive Mode by selecting Edit, Interactive, or the Interactive Icon on
the Toolbar. A window will appear with a number of tabs. These tabs can be used
to input weather conditions, change line payouts, switch on thrusters, etc. Once
the appropriate conditions have been set click OK at the bottom of the Interactive
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Mode window and the conditions will be applied and the program will return to
the Main Screen with the mooring system in the new equilibrium position.
If more than one set of conditions is to be changed at the same time, for example,
applying wind, current and thrusters all from a new direction, then the OK button
should not be clicked until all the tabs have been edited.
Units, wind and wave spectra, current types, etc, can all be changed during an
analysis by using the Options Menu accessed via the Edit Menu. If any options are
changed during an analysis, for example, units changed from metric to imperial,
the program will resolve and show the results on screen in the new units.
Running the program interactively does not directly produce results for output to a
printer. To save results for post processing and output the Write Results command
must be selected from the File Menu. Alternatively an icon on the toolbar can be
used. An outline of how the results are post processed and output generated is
contained in the next section.
4.5 Getting Results
Gmoor32 uses a database to allow post processing of results. With the new batch
analysis capability large quantities of data can be generated and it is necessary to
be able to lter these to nd the design cases. The results database is a series of
linked text les that are used to produce output reports.
These database les are written to a subdirectory of the directory where the Spread
File is located. The subdirectory will be assigned a name corresponding to the
Spread File name with the extension .wrk. The database les are available after
the program is closed and it is therefore possible to quit Gmoor32 and restart
without losing results. Care must be taken not to make major changes to the
Spread File between runs as appended results may not be consistent with earlier
runs. If major changes are made (ie additional mooring lines, dierent vessel, etc)
then the database should be overwritten.
4.6 Interactive Reports
Consider rst running in the Interactive mode. Results from an Interactive run
are written to the results database when the Write Results command is issued.
Each time this command is issued a new set of results is generated and assigned
a unique Run ID. This Run ID is then used to identify each run during reporting
or post processing.
After issuing the Write Results command the results can be printed using the
Print/Print Preview commands in the File Menu. To preview the output for a
particular run select Print Preview and the Report Selection window will appear.
Select Detailed Output and click OK. A dialogue box will appear where the user is
prompted for the Run ID number. If All is selected then a report is generated for
all cases run since the results database was initialised. If the program is being run
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interactively then there may be only a few cases in the database and it is easy to
step through the results to nd the case required. If Batch cases have been run
then a large number of Run IDs will have been generated and it may be simpler to
enter the correct Run ID at the prompt. The Batch reports described below lter
the results to nd the design case and report which Run ID to select for detailed
output. Reports can be sent to the printer using the Print Icon in the GMOOR
Reports window.
The other reports available for Interactive runs are Anchor Locations and Component Details. In both these reports the details are only updated if there is a
change to the spread layout such as if the anchors are moved or the component
properties altered during an analysis. The spread applicable at any stage is kept
track of via the Spread ID. If changes are made to the spread during a run then it
must be ensured that the correct Spread and Run ID's are in all related reports.
The latest Run ID is shown on the Summary 1 tab.
4.7 Batch Mode
When a Batch analysis is run results are automatically written to the results
database. It is therefore not necessary to use the Write Results command. Each
individual analysis within a Batch will be assigned a unique Run ID and this can
be used for reporting later.
Three reports are presently available exclusively for Batch analyses. These reports
are Batch Tabular Results, Batch Detailed Results and Batch Weather Details.
Batch Tabular Results produces tables showing the maximum line tension in each
line summarised by analysis type. The analysis types are Intact, Static SLF, and
Transient SLF.
Batch Detailed Results searches through the batch runs and nds the three runs
with the highest line tensions. A more detailed report is produced showing the input
Environmental forces and tensions in all lines. Again the results are summarised
by analysis type: Intact, Static SLF, and Transient SLF.
Batch Weather Conditions produces a table relating the Run ID for each batch run
to the weather conditions input. This is useful for cross checking that all weather
directions have been considered and that the input values are correct.
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Chapter 5
Main Screen
Gmoor32 will after initialisation show the main screen with the Field View activated using the data in Spread, Field and Vessel les. Summary1 & Summary2,
Files and User Options Tab Dialogues are also displayed (see gure 5.1).
Figure 5.1: Main Screen
Additional views of Head-Up, Leg, Position and Motion are available to the user
to display and summarise all details of the analysis.
Pull down menus are available to the user to assist in running the program:- File,
Edit, View, Graphs, Guidance, Batch, Window and Help. This section is designed
to familiarise new and existing users with the new Windows interface and additional
features.
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5.1 Field View
The default screen on start-up shows an outline of the vessel (dened in the Plan
File) over the reference location, all anchor lines deployed (as dened within the
Spread File) and with no environmental forces. The individual line tensions and
payouts are shown as text on the appropriately numbered anchor lines. Initial
case will give all lines deployed in a state of equilibrium. The thrusters are shown
with arrows and values indicating the amount and direction of the thrust provided.
Initially the thrusters are inactive, though their positions can be seen with the
symbols T1, T2, etc. On the right hand side of the main screen there are Tab
Dialogues titled Summary1, Summary2, Files and User Options.
Cursor co-ordinates are situated in the bottom right of the screen below the tab
dialogues. If the cursor co-ordinates are not visible click on the Field View window
and they should appear. If they are still not visible ensure that the Status Bar is
enabled in the View Menu.
5.1.1 Right Click Menu
Right clicking the mouse brings up a shortcut menu for overlaying rings on the
eld view and for changing display settings.
5.1.2 Edit Mooring Line
Double clicking on a mooring line will bring up the line status dialogue box. This
is a short cut to the Edit, Interactive - Leg Menu and it is possible to alter the
payout, tension, or status of a line.
Dragging and dropping the anchors activates the Anchor Relay Menu. It is possible
to rapidly alter the mooring spread interactively using these features.
5.2 Head-Up View
The user can tab between the displays of Field, Head-Up, Leg, Position and Motion. The Head Up View shows an outline of the vessel with arrows depicting the
forces from the mooring lines, thrusters, riser and resultant force. The force value
is displayed alongside the arrow in the user specied units. The numbering of both
the fairleads and thrusters is also shown on this view.
5.3 Leg View
The Leg tab gives the user a table displaying the current status of the mooring
legs. Information is displayed, in a non-editable form, on Status, Payout, Change,
Minimum Fairlead Tension (Min Fld Ten), Mean Fairlead Tension (Mean Fld Ten),
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Maximum Fairlead Tension (Max Fld Ten), Anchor Tension (Anchor Ten), Anchor
Vertical Tension (Anchor Vert), Maximum % Breaking (Max % Brk), Minimum
Grounded Length (Grnd Min), Maximum Grounded Length (Grnd Max), Mean
Horizontal tension at Fairlead (Mean TH), Maximum Uplift Angle at Anchor (Uplift Ang), and Minimum Angle at Fairlead (Fld Ang) in the appropriate user dened
units.
When a dynamic analysis is run additional information will be displayed on this tab.
5.4 Position View
The Position tab gives the user a non-editable display of the Reference, Target
and Mean vessel position. Information is given on Easting, Northing and Heading.
These values are shown as UTM (metres) units.
The Oset of the Mean position from both the Target position and the Reference
position are shown with components of Easting, Northing, Resultant and Heading
in the user specied units.
5.4.1 Note on Reference and Target positions
Reference position is dened in the *.SPD le and is read into the program on
initialisation of the spread. It is often necessary to know the location of the vessel
relative to another location and this may be accomplished by dening a new Target
position. Initially the Reference and Target positions are at the same point but
the Target position may be altered using the Control Tab in the Edit, Interactive
window.
5.5 Motion View
The Motion tab gives the user a non-editable display of motions of the vessel.
Information is given on the Signicant and Maximum rst order motions for Surge,
Sway, Heave, Pitch, Roll and Yaw and second order motions for Surge, Sway and
Yaw. All motions are in the user specied units.
The maximum Second Order motion is calculated using the method dened in the
Code selected on the Code Tab of the Edit, Interactive window.
H CVF
5.6 Summary1 Tab
The Summary1 Tab Dialogue will display information from the Vessel Position,
Anchor Lines, Riser, and Weather. The current Run ID is also displayed.
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5.6.1 Position
The Position information section gives a non-editable summary of the vessel position.
The present Easting and Northing Co-ordinates of the vessel are given in Universal
Transverse Mercator's (UTM's), metres. The Oset, the distance of the mean
position from the Reference Position, is also displayed in the user specied units.
The initial value for the position is taken from the Spread File.
The present Heading of the vessel is given in degrees. The Oset, the bearing
from the initial spread vessel heading, is also displayed. The initial value is taken
from the Spread File.
5.6.2 Line Tensions
The Mean Tension and Payout are displayed as non-editable elds for all of the
vessel's anchor Lines. Units are user specied.
5.6.3 Riser
H Riser
The Riser information section gives a non-editable summary of the properties of
the riser. If no riser le, *.RSR, is included in the Spread File this section will not
be displayed.
Tension
The Mean Tension for the Riser is displayed with the user specied units. Throughout Gmoor32 the corresponding units are displayed for each individual eld as
dened by the user for each Spread File chosen. The user's choice of units are
dened within the Units section from the Edit, Options pull down menu or the
Unit Options Icon on the desktop.
UFJ Angle & LFJ Angle
The Mean and Max Upper Flexjoint (UFJ) and Lower Flexjoint (LFJ) Angles are
displayed. The units are degrees.
Stroke
The Mean, Max and Min Slip Joint Strokes are displayed with the user specied
units (see Edit, Options).
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5.7 Wind, Current, Sea & Swell Dials
Dials are given to show a representation of the Wind, Current & Wave environmental forces. The speed and direction (relative or absolute) of the wind and current
forces are displayed, and also the wave height, period and direction (relative or
absolute) for the Sea & Swell components. Units are user specied.
H CVF
5.8 Summary2 Tab
The Summary2 Tab Dialogue will display information for the Water Depth, Tide
and Draft, Mean Loads and Motions.
5.8.1 Tide & Draft
This section gives a summary of the Water Depth, Tide Level and Vessel Draft.
The values are read from the Spread File on start-up and are displayed in noneditable text boxes using the user specied units.
Tide height and vessel draft can both be altered at run time using the General
Tab on the Edit, Interactive window.
5.8.2 Mean Loads
This section gives a summary of the mean loads acting upon the vessel using the
present environmental forces and layout. The Force, Direction (towards), Moment
and Arm are displayed using the user specied units.
5.8.3 Motions
This section gives a summary of the motions of the vessel as a result of the
environmental loading. Signicant and Maximum First Order Surge, Sway, Heave,
Pitch, Roll & Yaw motions are displayed using the user specied units.
Also displayed are Second Order motions for Surge, Sway and Yaw.
H CVF
5.9 Files Tab
The Files Tab Dialogue gives non-editable elds of the le locations for the input
and output from Gmoor32.
The full path for the current Project is displayed here. The path is the location for
the Spread File, and subsequent Field, CVF, VSL, Plan, Riser and DXF les which
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are used by Gmoor32 for the analysis. The DXF option is not presently available
in this version of Gmoor32.
On initialisation Gmoor32 creates a sub-directory (folder) which is used for storing
output text les. This sub-directory is named based on the Spread le name with
the extension .WRK, and is referred to as the Spread Working Directory.
E.g. Spread name C:\gmoor\G32_EXAM.spd
Output directory C:\gmoor\G32_EXAM.wrk
5.10 User Options Tab
The User Options section gives a summary of the options chosen by the user
from the Edit - Options section and adopted throughout the analysis. Options are
displayed for General, Wind, Wave, Current and Simulation.
5.10.1 General
The user specied General options of Direction (True or Relative), Payouts (metres
or feet), Lengths (metres or feet) and Forces (Tonnes, kN or Kips) are displayed
here.
5.10.2 Wind
H CVF
The user specied Wind options of Speed (m/s, knots or ft/s), Averaging Period
(1 hour, 10 min or 1 min), Reference height (Standard 10m or Anemometer) and
Wind Spectrum.
5.10.3 Wave
H CVF
The user specied Wave options of Period (Tz or Tp), Spectrum (PM or Jonswap)
and Spreading (O or On).
5.10.4 Current
H CVF
The user specied Current options of Wind Induced (O or On), Speed (m/s,
knots or ft/s), Direction (from or towards) and Depth (metres or feet).
5.10.5 Simulation
The user specied Simulation options of Simulation Period in seconds and Time
Step in seconds. These values are used during transient analyses.
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5.10.6 Cursor Co-ordinates
The co-ordinates of the cursor are displayed as UTM's (always in metres) in the
bottom right hand corner of the window below the dialogue tabs. To enable or
re-enable these click on the display in the Field View.
5.11 Transient Tab
The transient tab appears at the end of a transient analysis. It is usually hidden.
It contains two tables. One gives some position details relating to the maximum
transient oset and the other gives the maximum tensions in individual lines.
Note also that the position screen is updated after a transient analysis, giving
further details of the transient osets.
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Chapter 6
File Menu
Figure 6.1: File Menu
The File pull down menu contains the following options; Open, Close, Save As,
Write Results, Print, Print Preview, Print Set-up, Job Details, Exit and a list of
the last four opened Spread Files.
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6.1 New Spread...
This option brings up the interactivce Spread Editor.
6.2 New Single Leg...
This option brings up the interactivce Leg Editor.
6.3 Open...
The Open selection will bring up a standard Windows File Open Dialog to allow
the selection of any existing Spread File. The user may also use the Open Icon in
the Toolbar. This window is described in the section on Spread File Selection.
It is possible to have more than one spread le open at the same time.
6.4 Close
The Close selection allows the user to close the active Spread File.
6.5 Save As
The Save As command allows the user to save a spread le under a new name or
in a new directory. This is useful if the anchor relay option has been performed. If
the spread le is saved to a new directory then any referenced VSL, CVF or FLD
les must also be copied to the new directory.
6.6 Import Live Data
This option will import the current live data as it has been written to the database
from the Data Acquisition application. This is only available for the version
of Gmoor32 written specically for SKAAS systems and requires the Borland
Database Engine to be installed.
6.7 Write Results
The Write Results command is used to generate output data for post processing.
The use of this command is the rst step in producing printed output during an
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CHAPTER 6. FILE MENU
interactive run. Selecting Write Results causes the program to write results to a
series of text les located in the Spread Working Directory. To print or preview
results select the corresponding command from the File menu. The text les in
the Spread Working Directory will remain available even after Gmoor32 is closed.
On restarting an analysis it is possible to access the stored results provided the
same spread le is opened in the same data directory. If an analysis is restarted,
the rst time the Write Results command is selected a dialogue box will appear
asking whether the user wishes to overwrite existing results or append the latest
results to the existing les. During Batch and Consequence Analysis results are
automatically written to the output text les in the Spread Working Directory.
6.8 Launch Report...
To preview the printed output select the Launch Report command from the File
Menu (g 3.18).
6.9 Print and Print Preview
The user may also use the Print Icon in the Toolbar.
The Print and Print Preview selections enable a window that shows a list of the
available reports. A number of standard report types are available which should
provide the user with sucient information for most standard mooring analyses.
It is possible to create customised reports using the program Crystal Reports, ask
Global Maritime for more details.
Select the report you wish to preview/print.
The user may also use the Print Icon in the Toolbar.
For more detailed information on reporting results from Gmoor32 see Getting
Results.
6.10 Print Set-up
The Print Set-up selection will enable the Print Set-up window to allow the user
to change the printer or the printer settings.
6.11 Job Details
The Job Details selection enables the window, GMOOR Program Information,
which allows the user to enter the following job specic information. Client,
Project, Run Title, Run By and Run Date.
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Figure 6.2: Job Details
The Run By and Run Date elds are entered automatically by picking up the user
logged on and the current date from the PC, though the user can alter these at
run time. This window also displays the program Version No, and the program
Licensee.
6.11.1 NOTE
The job details entered here will be reproduced on the output, provided it is entered
prior to the rst Write Results command.
6.12 Exit
Exits Gmoor32.
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Chapter 7
Edit Menu
Figure 7.1: Edit Menu
The Edit pull down menu contains the following selections: Move, Zero, Relay,
Interactive and Units & Analysis Settings.
7.1 Spread...
Brings up the interactive Spread Editor (see chapter ??)
7.2 Move
This is a short cut to the Control Tab on the Edit, Interactive window.
It is possible to redene the Target position and move the vessel to the target
position using the two commands in this menu.
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7.2.1 To Target
Moves the vessel to the currently dened Target position. The mooring line payouts are adjusted to move the vessel whilst maintaining the current line tensions.
This may not always be possible if the distance to be moved is large and some
alteration in tensions may be necessary.
If the target position is not reached on the rst Move to Target command retry a
second time.
7.2.2 Change Target
Initially the Target position is the same as the Reference position given in the
Spread File. The Target position can be changed using this command, which
brings up a dialogue box. In this dialogue box the new Target position can either
be entered directly in UTM co-ordinates, or can be calculated using the user
dened units.
7.3 Zero
7.3.1 Payout Counters
After moving the vessel or adjusting mooring line payouts the amount of adjustment is shown in the Change value in the Leg View. It is often convenient to
reset this value to zero prior to an analysis and this is achieved by selecting this
command.
7.3.2 Environment
This command will reset all environmental conditions (ie. Wind, wave and current)
to zero.
7.4 Relay...
The mooring spread can be altered interactively using the Relay Anchors Menu.
All anchors can be moved simultaneously to alter the vessel's heading or position,
or each anchor can be moved individually. This menu is activated via the Edit
Menu or by dragging and dropping a selected anchor.
When this menu is selected a dialogue box appears showing the position of the
vessel and all the anchors currently deployed.
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7.4.1 Moving the Vessel
If the vessel heading is to be altered or a global shift in position is required then
the new vessel location/heading is entered in the top half of the dialogue box.
Clicking on the Apply button will move the anchors and keep the dialogue box on
the screen. The OK button closes the dialogue box and moves the anchors. The
Cancel button closes the box with no changes made.
The vessel and anchors can also be moved using the Relay Here command which
is activated by right clicking the mouse when the Field View tab is active. The
vessel Easting and Northing will be set to the position of the mouse pointer when
the right button is clicked.
7.4.2 Moving Individual Anchors
Each anchor can be moved individually in turn. The anchor positions can be dened
in several ways: range and bearing from fairlead, range and bearing from Vessel
Centre, Northing and Easting, or by Payout/Tension.
7.4.3 Drag and Drop
You can also move the Anchors by drag and drop with the left menu button. Click
near to the anchor to be moved and holding the left menu button down, drag it
to the required location and let go of the left mouse button. The Relay dialog
will appear and the proposed new anchor location will be highlighted with a dotted
line. You can accept the new position using either OK or Apply.
The Relay Dialog is a modeless dialog, so you can now keep the dialog open and
carry on relaying anchors - either by editing the grid or by dragging and dropping.
7.5 Interactive...
Brings up the main Interactive editing dialog (see chapter 12)
7.6 Miscellaneous Options...
Brings up the miscellaneous options dialog (g 7.2)
This dialog allows you to edit some options that aren't relevent to the open spread
le.
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CHAPTER 7. EDIT MENU
Figure 7.2: Miscellaneous Options Dialog
7.6.1 Paper Size for PDF Reports
Reports are generated on the y in Adobe PDF format. The PDF has it's own
paper size commands embedded in the document. This enables the default to be
set
7.6.2 Disable Non-Matching License Errors
This is relevent to the licensing system and the license les. A detailed explanation
of the licensing system is given in Appendix C.2.
Basically, in stand-alone licensing mode, GMOOR requires a license le with le
extension (*.lic) to be present in the GMOOR program folder. This contains a
locking code which is specic either to the computer or to the dongle. If a license
le is detected with a locking code that does not match the computer or dongle
then a warning is given, which can be irritating if you have several *.LIC les in
the folder, say, from your previous laptop. The message is really just a reminder
that you should delete the indicated LIC les.
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Chapter 8
Spread Editor
The spread editor allows changes to be made to the conguration of the open
spread le without aecting other run time settings, such as the weather parameters.
These changes may optionally be written back to the spread le for future use.
The spread editor takes the form of a wizard which guides the user through ve
stages of conguration:
1. Supplying a working title for the spread le
2. Specifying other data les (vessel or custom vessel le; optional riser le and
optional eld le)
3. General parameters (units of measurement; vessel position and water depth)
4. Leg conguration
5. Gangway setings
The spread editor can be invoked in 2 ways :From the menu using File New - in this case you create a new spread le
from scratch, although you have the option of importing an existing le and
using it as a template. At the end of the wizard you are prompted for a new
spread le name and a new spread le is created.
From the Edit-Spread Menu - in this case you are editing the open spread.
When the wizard closes you do not get the option of saving to another
spread. A temporary spread is made in the project working directory. When
you eventually close the spread le, you have the option of saving the modied spread. This OVERWRITES your original spread le.
It might also be useful to look through the documentation for the spread le format
.
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CHAPTER 8. SPREAD EDITOR
8.0.3 Supplying a working title
The rst stage of the spread editor wizard allows the user to specify a working
title for the spread le (see g 8.1.
Figure 8.1: Spread Editor - Step 1
8.0.4 Specifying other data les
The spread editor's second step requires the user to enter the location of the
vessel le (VSL) or custom vessel le (CVF). Locations can also be specied for
the optional riser le and eld le (see g 8.2.
The box to the left of the location should be checked for any les which should be
included. Note that a vessel le or custom vessel le must be specied, but only
one may be checked for inclusion at any one time.
8.0.5 General parameters
The third step of the spread editor congures the type of units used; the position
of the vessel, and the water levels (see g 8.3.
Units may be specied in either metric (i.e. metres & tonnes) or imperial measures
(i.e. feet & kips).
The vessel position is given as an easting & northing in Universal Transverse
Mercator coordinates, and a heading in degrees clockwise from True North.
Finally for this screen, the water depth, tide height and initial draft are entered in
either metres or feet, according to the unit setting above.
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Figure 8.2: Spread Editor - Step 2
Figure 8.3: Spread Editor - Step 3
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8.0.6 Leg conguration
The fourth step in the spread editor allows the legs to be congured.
The quickest way to create a conguration is to start with a predened arrangement by selecting an option from the list in the Mooring Predened Layouts box
and clicking Apply.
The Dened Legs grid will display a row for each fairlead present on the selected
vessel le.
Each fairlead must be allocated a Leg Type or marked as unused in this column.
A leg type is identied by number, and must be dened before use (see below) .
A leg may be moved from one fairlead to another by double clicking its fairlead
number and entering the number of the fairlead it should move to. If the destination fairlead already has a leg attached, it will be swapped with the one being
moved.
For each leg used, a range or payout must be entered which is relative to the
centre of the vessel or the fairlead according to the Leg Options setting above.
Either a pretension value or adjustable length is specied, aecting only the adjustable component on the leg.
The bearing of the leg is given either relative to north, if the Leg Options are set
to Centre of Vessel, else it is relative to the heading of the vessel.
Anchor depth is specied in metres or feet according to the unit settings, and
slope gives the gradient of the seabed beneath the anchor.
The status of the leg reects whether it is not deployed (0), intact (1) or broken
(2).
The button in the bottom right, Edit Leg Types, allows the individual leg types to
be dened as required by the rst grid column.
8.0.7 Editing Leg Types
(see gure 8.5).
A spread le can contain a number of dierent leg types. A leg type is unique in
the components which comprise it - if several legs on the same vessel are alike,
only one leg type is required to serve all of them.
Each type created is given a number which is used on the leg conguration screen
alongside the required fairlead.
Within the leg type editor, the buttons New, Copy & Delete may be used to
create or remove types, while an existing type may be selected by its number via
the drop-down list.
For each type, a maximum length for the adjustable component may be specied,
and there is a buoyx ag which, if set, indicates that the buoy should be xed to
the water surface.
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Figure 8.4: Spread Editor - Step 4
The components of the leg are maintained in the Components List, with the
component nearest the anchor at the top of the list and the one nearest the
fairlead at the bottom of the list. Components may be moved by dragging them
up or down the list, and the adjustable component is set by right-clicking on the
relevant item.
The details of a component are changed by either double clicking on an existing
component, or by adding a new component using the button on the right.
Figure 8.5: SpreadEditor - Edit Leg Types
The Component Details screen shows the various properties of the component,
and allows it to be given a name. In addition, there is a tickbox which allows the
optional dynamic properties to be turned on or o as required (see g 8.6).
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CHAPTER 8. SPREAD EDITOR
Figure 8.6: SpreadEditor - Component Details
The Suggest button (see g 8.7) provides a mechanism for quickly creating leg
components based on predened formulae for certain materials.
Simply select the component type and diameter to ll out the non dynamic properties of the component
Figure 8.7: SpreadEditor - Suggest Component
8.0.8 Gangway settings
The nal step of the editor allows for gangway settings to be specied (see g
8.8).
If there is a gangway, it is displayed on the main Field view page. Warning and
Alrm extension limits are shown superimposed on the gangway. It is assumed that
a eld le is being used with a pepresentation of a xed platform in it.
GMOOR needs to know where to draw the gangway in relation to the vessel.
Coords of gangway landing on the vessel - these are in vessel coorinate
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Coords of gangway landing on the platform - these are in global coordinates,
releative to the reference point.
Nominal length of gangway - this is the zero-extension length
Extension for warning and lifto - relative to zero
Angles for range arcs - controls where the warning and alarm arcs are drawn.
Relative to the Vessel heading....
When all changes to the spread les are complete, press Finish to apply the
changes, or Cancel at any time to forget them.
Figure 8.8: Spread Editor - Step 5
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Chapter 9
Units & Analysis Settings
The Options selection from the Edit Menu gives the user the ability to enter xed
defaults for Gmoor32 to run on. The options available are; Units, Default Values,
Beaufort and Batch.
9.1 Units
This selection allows the user to enter information to dene the units for an
analysis.
General, Wind, Wave, Current and Code options are available as tab selections.
All these values can be altered during an analysis. When using a VSL le only the
General tab is available.
Output reports from Gmoor32 will be generated using the units current at the
time of each Write Results command.
9.2 General
The user can enter the general information for Gmoor32 conguration in this tab.
The OK button will save any changes made to the conguration and close the
window. Cancel will discard the changes and close the window.
9.2.1 Directions
Choose the direction convention from True or Relative. True direction is relative
to North, whilst Relative is the direction relative to the current vessel heading.
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CHAPTER 9. UNITS & ANALYSIS SETTINGS
9.2.2 Payouts
Choose the unit of length for the Line Payout from metres and feet.
9.2.3 All Other Lengths
Choose the unit of length, from metres and feet, to be adopted throughout the
analysis except for Line Payouts (see above). UTM co-ordinates are also not
included in this selection (always in metres).
9.2.4 Forces
Choose the unit of Force from the options of Tonnes, kN and Kips.
9.2.5 Reference Grid
Enter a value for rotation from the True North in degrees.
9.3 Wind
The user can enter the Wind information for Gmoor32 conguration in this tab.
9.3.1 Speed
Choose the unit of Speed from the options of m/s, knots and ft/s to be used.
9.3.2 Averaging Period
The user can dene the Averaging Period for the wind speed entered at run time.
The options are 1 hour, 10 min and 1 min mean. The wind speed used to calculate
the wind force acting on the vessel can have a dierent averaging period from that
input.
9.3.3 Force Calculations at 10m
The averaging period required for calculating the wind speed should be chosen
here from the options of 1 hour, 10 min and 1 min. The input wind speed can
have a dierent averaging period.
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9.3.4 Gust Factors
This button will enable a new window, Gust Factors for Force Calculations window.
The OK button will save the changes made and close the conguration window.
Cancel will discard the changes and close the window.
One Hour
The One Hour value is the default gust factor calculation and is set to 1.
Ten Minute
The user can enter here the gust factor value for Ten Minute averaging period.
The default is 1.045.
One Minute
The user can enter here the gust factor value for One Minute averaging period.
The default is 1.170.
9.3.5 Reference Height
The user can choose the reference height for wind loading from the options
of Standard 10m and Anemometer. Selection of Anemometer will activate the
Anemometer section.
9.3.6 Anemometer
For the Anemometer the user must enter information on the Units, Reference
Height and Power Law Exponent
Units
Choose from the options of metres and feet.
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Reference Height
Enter the Reference Height of the vessel's anemometer above sea level. This value
will be used to calculate the wind speed and loading at the standard reference
height of 10m. If this is empty the user will be prompted to enter a value.
Power Law Exponent
Enter the Power Law Exponent for the location. This value will be used to calculate
the wind speed and loading at the standard reference height of 10m. The default
value is 0.12.
9.3.7 Wind Spectrum
The wind spectrum used in the calculation of second order motions can be selected
from a drop down list.
Spectra available are: None, API RP2A, Sletringen (NPD), Harris, and Ochi &
Shin. A selection of None will prevent the use of a wind spectrum in the calculation
of second order motions.
9.4 Wave
The user can enter the Wave units information for Gmoor32 conguration in this
tab.
9.4.1 Period
Choose the type of wave Period from the options of Tp (Peak Period) and Tz
(Zero Crossing Period).
9.4.2 Spectrum
Choose the type of wave Spectrum from the options of PM (Pierson-Moskowitz)
and Jonswap.
9.4.3 Spreading
The user can choose to enable or disable wave Spreading with the On/O selections. When On is selected the Spreading value edit box is enabled. Enter a
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CHAPTER 9. UNITS & ANALYSIS SETTINGS
numerical value n to correspond to the form of wave spreading (cosn). The default
value for n is 2.
9.4.4 Duration
Enter the Duration of the storm to which the analysis is performed. This value is
used in the calculation of the wave spectrum details.
9.5 Current
The user can enter the Current information for Gmoor32 conguration in this tab.
9.5.1 Data Entry
The user can choose between the data entry forms of Speed and Direction or XY
Speed Components. The choice made will be adopted throughout the entry of
current details.
9.5.2 Type
Choose between the options of Surface (current) and Current Prole. The choice
made here will aect the Current tab dialogue in the Edit, Interactive menu, either
Surface Current or Current Prole. The selection of Surface will enable the Wind
Induced section.
9.5.3 Wind Induced
The status of Wind Induced current is displayed, ON or OFF, along with the
View/Edit button enabled or disabled.
9.5.4 Speed
Choose between m/s, knots and ft/s for the current Speed units to be adopted
throughout the analysis.
9.5.5 Direction Convention
Choose between From and Towards for the Direction Convention for the current
to be adopted throughout the analysis.
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9.5.6 Depth Units
Choose between metres and feet for the Depth units to be adopted throughout
the analysis.
9.5.7 View/Edit
The View/Edit button enables a new window, Wind Induced Current, where the
user can enable or disable wind induced and also congure the parameters involved.
Click OK to commit the changes and close the Wind Induced Current window. To
discard the changes made and close the window click Cancel.
Status
Select On or O to enable/disable the wind induced current. O will disable the
conguration options within this window.
Proportion Of Mean Hourly Wind Speed
Enter the Proportion of the Mean Hourly Wind Speed that the wind induced
current is equal to.
9.5.8 Direction Relative To Wind
Enter a value for the wind induced current Direction Relative to the Wind. Units
are in degrees.
9.5.9 Mixing Layer Thickness
Enter the Mixing Layer Thickness using the user specied units.
9.6 Code
When run in the Batch Mode Gmoor32 will perform code checking to API RP2SK
or DnV POSMOOR rules. On the Code tab there is a drop down list of the codes
that can be applied. When a code is selected then the applicable Safety Factors
or the allowable percentage breakload are displayed.
The method used to combine rst and second order motions varies between API
RP2SK and POSMOOR. When a code is selected then the correct formulation
will be applied in both Interactive and Batch modes. Reference should be made
to the relevant codes for further details.
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9.7 Default Values
The user can enter the Default Values information for Simulation (Transient) and
Consequence in this tab.
The OK button will save any changes made and close the default value conguration window. Cancel will discard any changes made and close the window.
9.8 Simulation
The user can enter the Simulation default values information for Gmoor32 conguration in this tab.
9.8.1 Simulation Period
The user can enter the simulation period for the transient analysis here, in seconds.
The default value is 200 seconds.
9.8.2 Time Step
The user can enter the time step for the analysis simulation here in seconds. The
default value is 1 seconds.
9.9 Consequence
NOTE
This is an additional facility and may not be available on your system. Contact
Global Maritime for further details.
The user can enter the Warning and Alarm Consequence default values information
for Gmoor32 conguration in this tab. These values will be used upon start-up of
the Consequence analysis section and can be modied within this window for all
Gmoor32 project les.
The OK button will save any changes made and close the Consequence conguration window. Cancel will discard any changes made and close the window.
9.9.1 Line Tension
Enter the default Consequence Analysis values for Line Tension to be used in
Station Keeping. The units are user specied.
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9.9.2 SlipJoint Stroke
Enter the default Consequence Analysis values for SlipJoint Stroke to be used in
Station Keeping. The units are user specied.
9.9.3 Upper FJ Angle
Enter the default Consequence Analysis values for the Upper FlexJoint Angle to
be used in Station Keeping. The units are in degrees.
9.9.4 Lower FJ Angle
Enter the default Consequence Analysis values for the Lower FlexJoint Angle to
be used in Station Keeping. The units are in degrees.
9.9.5 Oset
Enter the default Consequence Analysis values for the vessel oset from wellhead/target location to be used in Station Keeping. The units are user specied.
9.10 Beaufort Scale
The Beaufort selection gives the user a non-editable summary of the Beaufort
Numbers and their corresponding numerical values - see gure 9.1.
Figure 9.1: Beaufort Tab
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9.10.1 Wind Description
The description of the Force number is displayed for the user.
9.10.2 Sea Height
The Sea Height corresponding to the Beaufort Number entered in the Interactive
section is displayed in metres.
9.10.3 Period
The Peak Period (Tp) corresponding to the Beaufort Number entered in the Interactive section is displayed in seconds.
9.10.4 Wind Speed
The Wind Speed corresponding to the Beaufort Number entered in the Interactive
section is displayed in knots.
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Chapter 10
View Menu
10.1 Status Bar
This will enable or disable the Status Bar located at the bottom of the window
below the Summary tabs.
10.2 Toolbars
The Toolbars selection allows the user to enable or disable the toolbars of Standard,
Edit, View and Graph.
10.2.1 Standard
Contains Icons for the standard operations of File Open, Print, About and Help.
10.2.2 Edit
Contains Icons for shortcuts to the Edit Menu such as the Interactive and Units
Options menus.
10.2.3 View
Contains Icons for Zoom In, Zoom Out, Wide Angle, Close Up, Rings and Force
+ Motions Summary.
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Figure 10.1: View Menu
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CHAPTER 10. VIEW MENU
10.2.4 Graph
Contains Icons for Catenary Prole, Line Excursion, Vessel Excursion and Point
graphs.
10.2.5 Field
The Field selection will turn on or o the eld view i.e. toggle between a nowhere
eld (no detail in background) and the chosen eld le which may have detail
(owlines, subsea structures, etc.).
If you cannot see you eld layout ensure that this option is enabled.
10.2.6 Rings
This selection enables/disables the rings in the Field view. A dotted line is given
showing the vessel's oset (direction and distance of the target position relative
to the vessel's current position). Initially the oset is normally close to zero.
10.2.7 Rings Current
This selection will update the rings centre to the current vessel position.
10.2.8 Zoom In & Zoom Out
These selections will zoom in or out in increments of 15 metres (or equivalent
feet).
10.2.9 Close Up & Wide Angle
These selections will toggle between close-up and wide angle views as dened by
the user.
10.3 Settings
The Settings command will enable the Settings Window where the user can dene
the display of the Field View. Three Tab Dialogues are available; Colour Settings
and Ring Settings and Field View Options.
Click OK to keep the changes made and Cancel to discard them and close the
window.
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CHAPTER 10. VIEW MENU
10.3.1 Colour Settings
The user can modify the colour of the Field View display by clicking the Change
button next to the appropriate options. The options available to the user to
change are; Background, Rings, Plan, Mooring Lines Broken & Intact and Text.
The change button will activate the standard Windows Colour Palette where the
user can select standard colours or dene custom colours to the palette.
10.3.2 Rings Settings
The user can enter the co-ordinates for the centre of the rings in UTM's (metres).
The default value is the Reference position. The present button will set the
centre of the rings to the current vessel co-ordinates as displayed in the Easting
& Northing Position Summary tab. The spacing of the rings can be set manually
by entering a value or by the increment arrows to increase or decrease by 1 length
unit .
The Show check box allows the user to turn the rings on or o. The user can also
enable or disable the rings from the Rings icon in the View toolbar.
10.3.3 Field View Options
This tab contains two check boxes that allow the user to toggle on and o the
eld view and the payout/tension text written on the eld view.
10.3.4 Force Summary
This selection will enable a new window, Force and Motions Summary, where the
user is given a non-editable display of the current forces and motions acting upon
the vessel. The units are user specied. Only rst order motions are reported.
To close the Force and Motions Summary click on the X top right. The window stays on top of all windows in Gmoor32 until it is closed by the user or the
interactive menu is opened.
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Chapter 11
Guidance Menu
The guidance option is intended for use when there is a riser le associated with
the spread. It estimates the optimum position of the rig based on :a Slipjoint Stroke
b Lower Flexjoint Angle
c Upper Flexjoint Angle
The optimum position is calculated for the current weather conditions. In general
there will be an boundary area of acceptable values riser paramers and thgis area
will be dierent fro each of the above parameters and dierent when considering
intact or damaged conditions (single line failure, etc). This means that there is
no single 'optimum' position and what is considered 'optimum' depends on the
importance attached to each of the paramters.
The Guidance Option is only available in the full (GMOOR32D) version of the
program
11.1 Guidance Limits
The limits for each of the parameters should be choses carefully and be as relistic
as possible in order for the results to be meaningful.
The rst thing the user needs to do is set up the required riser limits using the
Guidance-Limits dialog (see g 11.1.)
Enter the required maximum values for intact and consequence (any single line or
thruster failure)
To calculate the optimum positions, select the Guiadance-Process menu option
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CHAPTER 11. GUIDANCE MENU
Figure 11.1: Guidance Limits
11.2 Guidance Results Screen
Once the user has selected the Guidance Limits for the Guidance he can proceed
to process the guidance. The Guidance Results screen will then be displayed (see
g 11.2.
)
Figure 11.2: Guidance Results Screen
The guidance Results screen shows the main results from the guidance calculation.
This is split into 5 sections:1. Limits
This section show the user selected limits for the slipjoint stroke, upper and
lower exjoint angles
2. Present Values
This section shows the present values of mean vessel position and the riser
angles and slipjoint stroke in the intact condition and the worst case values
for a consequence analysis from the present position
3. Estimated Optimum
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This section shows the estimated optimum position based on the user selection of riser parameter and whether it should consider intact or consequence
anlaysis.
4. New position calculation
The values of the riser parameters at the new position are shown in section
(5) . In this section you select whether the new position will be the optimum
posiion calculated from (4) or will be a user entered position. If it is a user
entered position, the relevent poision entry boxes will be available.
5. At New Position
The values of the riser parameters in the intact and consequence cases are
shown for the new position as selected in (4)
The user can alter the limits or the basis for estimating the optimum position while
this screen is displayed and the answeres will be shown immediately (see g 11.3).
Figure 11.3: Guidance Graphical Results
A graphical view of the optimum positions can be shown by selecting 'Plot Contours' . This shows the allowable area where the riser parameters are within the
selected limits in Green for each parameter and in both intact and consequence
cases.
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Chapter 12
Interactive Dialog
This is the main gateway for entering Run details for analyses in the Interactive
mode. Details are entered in the selection tabs on the following subjects; General,
Weather, Current, Extra Force, Extra Motion, Legs, Thrusters, Riser, Vessel,
Control and Analysis. The user can activate the Interactive windows from the
Interactive icon on the Edit toolbar.
Figure 12.1: Edit Interactive Selection
If the analysis is being performed with a VSL le then the Weather and Current
Tabs will not appear and the tabs labelled Force and Motion should be used.
OK will save any changes made by the user within the Interactive Mode and run
the analysis. The Interactive Mode window will be closed and the Field, Head Up,
Leg, Position and Motion Views will be updated with the changes. No change
is made to the Spread File (*.SPD). Cancel will prompt the user to cancel any
changes made and close the Interactive mode window. The Forces button will
display the Force & Motions Summary window when a CVF is being used.
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CHAPTER 12. INTERACTIVE DIALOG
12.1 General
The user can enter the general information for the analysis in this tab.
12.1.1 Case Title
Enter the title for the analysis case. This will be printed at the top of each page
of the output le produced.
12.1.2 Time Label
A time label for the run may be entered. Alternatively the user can click the Now
button to insert the present Date and Time taken from your PC's clock.
12.1.3 Water Depth, Draft & Tide
The Water Depth, Draft & Tide are taken from the Spread File. The user can
replace the values of Draft and Tide from the Spread File by manually altering
their values. No changes are made to the Spread le (*.SPD). Units are user
specied.
12.1.4 Forces
This will display a window, Force and Motions Summary, that summarises the
forces and motions from the components of Wind, Sea, Swell, Current, Extra,
Riser and Thrusters. The forces are displayed in the Gmoor32 co-ordinate system:
STBD (Starboard), FWD (Forward), Resultant, Direction (including convention)
and Torque. The rst order motions, Signicant and Maximum, are also displayed
in the Gmoor32 co-ordinate system: Surge, Sway, Heave, Pitch, Roll and Yaw.
12.2 Weather
H CVF
The user can enter the weather information, Beaufort, Wind and Wave, for the
analysis in this tab.
12.2.1 Beaufort
To run the analysis for a Beaufort Number (rather then enter individual information
for wind speed and wave height) check the Enable box to disable Wind and Sea
details (entered automatically by the Beaufort Number) and enable the Force
selection box and the Direction edit box. The units and convention for direction
are user specied.
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12.2.2 Summary
The Summary button will display the summary information window for the Beaufort Scale as described earlier.
12.2.3 Wind Speed
Enter the value of the Wind Speed. The elevation, time dependant mean value
and units are user specied (see Edit, Options - Units).
12.2.4 Sea & Swell Wave Height
Enter the height of the sea and swell components of the wave details. Units are
user specied.
Sea & Swell Period
Enter the period of the sea and swell components of the wave details. The type
of period and units are user specied.
Sea & Swell Direction
Enter the direction of the sea and swell components of the wave details. The
convention and units are user specied.
Wave Spectrum
The user specied Wave Spectrum is displayed here. This is altered in the Edit,
Options - Units menu.
Spreading
The user specied Wave Spreading option is displayed here. This is altered in the
Edit, Options - Units menu.
12.3 Current
The user can enter the Current information for the analysis in this tab. The form
of current is chosen in the Edit, Options - Units menu where the available options
are Surface Current and Current Prole.
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12.3.1 Surface Current
Speed
Enter the Average Surface Current speed. Units are user specied.
Direction
Enter the Current Direction. Units are user specied.
Current Option & Wind Induced Status
The user specied Current Option (Surface Current) and Wind Induced Current
Status are displayed here.
Speed, Direction and Convention
The user specied units of Current Speed, Current Direction and Direction Convention are displayed here.
Resultant Current
This will display a window of the Resultant Current forces of Wind Induced and
Tidal. The forces are displayed as an East and North value, and a Speed and
Direction.
12.3.2 Current Prole
The user must specify the current speed at the surface, if it is omitted it will be
set to zero. If no prole is specied or if the values do not cover the whole water
depth then the program will assume the current speed to be constant (uniform)
from the surface to the seabed. All values dened below the seabed will not be
entered or used in the analysis.
Gmoor32 calculates an average current speed from the current prole entered and
applies this at the centre of pressure of the hull. The centre of pressure is taken
as half the draft of the vessel.
If a current prole is selected then the wind induced current is switched o.
Depth
The Depth for each current prole ordinate is displayed here. Units are user
specied.
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Speed
The Speed for each current prole ordinate is displayed here. Units are user
specied.
Direction
The Direction for each current prole ordinate is displayed here. Units are degrees
using the user specied direction convention (to/from).
Insert
This button opens a new window to allow the user to create a new current prole
ordinate.
Enter the depth, speed and direction for the ordinate to be inserted. Click OK
to commit the changes made to the prole or Cancel to discard the changes and
close the Current Details window.
Modify
This button will allow the user to Modify an existing current prole ordinate, to
select click on the relevant depth value. If no ordinate has been selected the user
will be prompted to select a valid entry. It is possible to modify an existing prole
by double clicking on the depth value.
Delete
This button will allow the user to Delete an existing current prole. If no prole
has been selected the user will be prompted to select a valid entry.
Current Options & Wind Induced Status
The user specied Current Option (Current Prole) and Wind Induced Current
Status are displayed here. These can be altered using the Edit, Options menu.
Speed, Direction, Convention & Depth
The user specied units of current Speed, True current Direction, direction Convention and Depth are displayed here. These can be altered using the Edit, Options
menu.
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Average Current
This will display a window of the average current speed produced by the current
prole. The average current speed is dened as the current speed at the centre of
pressure of the vessel's hull. The centre of pressure is assumed to be at half draft.
The current speed is displayed as an East and North value, and also as Resultant
and Direction. The current force acting on the vessel is calculated based on the
average current speed.
12.4 Force (Extra Force)
The user can enter an environmental force when a VSL le is used, or an additional
force when a CVF is being used.
12.4.1 Axis System
The user can choose between the options of Relative and True for the Direction
convention.
12.4.2 Radial or Cartesian
The user can choose between the options of Radial or Cartesian. This will change
the options of extra force entry.
Radial
Cartesian
Force
Transverse
Direction Longitudinal
12.4.3 Force & Direction
Enter the extra Force using the user specied units and the Direction in degrees.
12.4.4 Longitudinal & Transverse
Enter the extra Transverse and Longitudinal force using the user specied units.
12.4.5 Moment
Enter the Moment (a positive moment reduces heading) using the user specied
units.
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12.5 Motion (Extra Motion)
The user can enter the First Order (Wave Frequency) Motion for the analysis
in this tab. If a CVF is being used the rst order motions will be calculated
automatically. This tab can be used to enter an additional motion if required,
for example to investigate the eects of increased motion in shallow water. The
motion entered should be a maximum value and where a signicant value is required
(eg in transient analyses) the program will calculate a signicant value based on
the Sea Wave Period.
12.5.1 Axis System
The user can choose between the options of Relative and True for the Direction
convention.
12.5.2 Co-ordinates
The user can choose between the options of Radial or Cartesian. This will change
the options of extra 1st Order Motion entry.
Radial
Cartesian
Excursion Sway
Direction Surge
12.5.3 Excursion & Direction
Enter the extra Excursion using the user specied units and the Direction in degrees.
12.5.4 Longitudinal & Transverse
Enter the extra Sway and Surge motions using the user specied units.
12.5.5 Yaw
Enter the Yaw motion in degrees.
12.6 Legs
The user can enter and modify the mooring Legs information for the analysis in
this tab.
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12.6.1 Line
The mooring Leg numbers are displayed here as dened by the Spread and Vessel
les.
12.6.2 Status
The Status of the mooring legs are displayed here. The status can be Intact,
Broken or Not Deployed.
12.6.3 Modify Line Status
To change the status of the mooring legs rst select the required mooring leg
number to be changed and then click the modify button. If a mooring line is not
selected you will be asked to select a valid entry.
This menu can also be accessed directly from the Field View by double clicking on
the mooring line to be modied.
The following options are available to the user if the leg status is Intact;
No Change)
Change Payout to
Change Payout by
Set Tension at Present Position to
Set Tension at Target Position to
Set Intact
Break
Not Deployed/Slack
If the line status is Broken or Not Deployed the options are reduced to;
No Change
Set Intact
Select the required option from the drop down menu and click OK to commit
the changes and close the Mooring Line Details window. Cancel will discard any
changes made and close the window.
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12.6.4 Payout & Tension
The Payout & Tension of the mooring lines are displayed here. Units are user
specied. If the \Show the initial Payout and Mean Tension for each Mooring
Line" is checked these elds will be activated.
12.6.5 Change
The change of status of the mooring lines is displayed here. The options available
are No Change, Change Payout to, Change Payout by, Set Tension at Present
Position to, Set Tension at Target Position to, Set Intact, Break and Not Deployed/Slack. The Status of the mooring lines are updated (returned to No
Change) once an analysis has been performed i.e. OK has been hit and the user
re-enters the Interactive Mode section.
12.6.6 Value & Units
For user specied changes to tension and payout the Value and Units of the change
are displayed here. The values are cleared once an analysis has been run.
12.6.7 Show the Initial Payout & Mean Tension
If this option is checked the Payout and Mean Tension is displayed for all mooring
legs. If the option is deselected these elds will not be present.
12.6.8 Units
The user specied units of payout and tension are displayed here.
12.7 Thrusters
The user can enter the thruster information for the analysis in this tab.
12.7.1 Mode
Only Mode available in this version of Gmoor32 is Manual Mode. Automatic Mode
is not available to the user.
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12.7.2 Manual Mode
The user can choose the form of thruster control between Individual control and
Joystick control. Individual will control the thrusters individually, and Joystick will
control all the thrusters together.
12.7.3 Modify
The Modify button will change it's properties depending on the Manual Mode
chosen. If Individual is selected the button will be \Individual Modify" and if
Joystick is selected the button will be \Joystick Modify". For Individual control the
user will be asked to select a valid entry rst. For Joystick control an operational
thruster will chosen. If no thrusters are in operation the user will be asked to select
one.
12.7.4 Individual Modify
Select OK to commit the changes made and close the Thruster Details window,
Cancel to discard and close.
Thruster Status
The user can select the chosen thruster to be Not Used or Intact. Intact option
enables the Individual Thruster and Azimuth control sections.
Thruster Percentage
Enter the Percentage Thrust for the Thruster or slide the bar to enter a value.
Thrust units are as a percentage and cannot be changed by the user.
Thruster Azimuth
Select from Relative or True and enter the required Azimuth in the enabled edit
box.
12.7.5 Joystick Modify
Thruster Status
Thruster Status is not available in Joystick Mode, all thrusters are in use.
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Thruster Percentage
Enter the Percentage Thrust for the Thrusters or slide the bar to enter a value.
Thrust units are as a percentage and cannot be changed by the user.
Thruster Azimuth
Select from Relative or True and enter the required Azimuth in the enabled edit
box.
12.8 Riser
The user can enter the riser information for the analysis in this tab. Gmoor32
requires a Riser File (*.RSR) to be present in the same directory as the Spread
File and referenced in the Spread File. An additional line must be entered in the
Spread File after the *CVF keyword.
e.g. for the riser le G32 RISE.RSR the relevant section of the Spread File would
be:
*CVF G32_EXAM
*RISER G32_RISE
If no Riser File is specied the Riser Tab Dialogue will not be available to the user.
NOTE
The riser capability is not a standard feature of Gmoor32. If you require this
feature please contact Global Maritime.
12.8.1 Connection
The user can choose between the following Connection status:Not Deployed
Hung O
Connected
12.8.2 Top Tension
The Top Tension is taken from the Riser File, or can be manually entered here by
the user to replace the value from the riser le for this particular run. No changes
are made to the *.RSR le. Units are user specied.
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12.8.3 Mud Weight
The Mud Weight is taken from the Riser File, or can be manually entered here by
the user to replace the value from the riser le for this particular run. Units are lb
per gallon.
12.9 Vessel
This tab allows the user control over the setting of vessel damping. Moored vessels
have poorly damped resonant responses in surge, sway and yaw at periods in the
range 50 to 300 sec. These low frequency (LF) modes are excited by unsteady
wind and wave drift forces. The extent to which these modes are excited depends
critically on the damping. There are the following contributions to the damping:1. Radiation damping.
2. Wave drift damping.
3. Viscous drag on the hull.
4. Viscous drag on the mooring lines
If Gmoor calculations of LF motions are not required, the user should uncheck the
Calculate Second Order Motion check box. On this tab in v9.2, damping values
are displayed in physical units, and not as percent critical, which was the practice
in previous versions.
There are radio buttons entitled Extra damping and Total Damping. If the user
selects Extra Damping, then Gmoor uses an iterative method to calculate equivalent linear damping, which represents the viscous damping on the hull, in the
current owing at the time. To do this, it uses the current forces in the CVF,
and it only uses the surge and sway damping in the very rst instance. The user
may enter extra linear damping, which is added to the afore mentioned Gmoor
estimate. This extra damping can represent mooring line and wave drift damping.
If the user selects the Total Damping radio button, then he must enter linear
damping coecients in surge, sway and yaw beneath. In this case, Gmoor simply
uses these total linear damping coecients, and bypasses the iterative equivalent
linear damping calculation.
The gures for Vessel Damping on this tab are those of the previous equilibrium
analysis. After setting any extra or total damping, the user should run the equilibrium analysis, and then review the damping on the Motion Screen, where the
damping coecients are displayed in both physical units and as percent critical,
along with the natural periods, etc.
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12.10 Control
The Control tab is used to simulate the winches on the vessel. It is possible
to move the vessel to the Target Position, slacken leeward lines, or perform full
control of all lines to optimise line tensions.
12.10.1 Position
Target (UTM)
The Target position is displayed in Universal Transverse Mercator units (UTM
metres) in a non-editable form. Initially the Target position is the Reference
position dened in the Spread File.
Redene Target
The Redene Target button will enable a new window, Position, where the user is
able to move the target location.
Reference
If changes have been made to the Target position they can be quickly cancelled and
the Target returned to the Reference position by clicking the Reset to Reference
button.
Move Rig to Target
If this option is enabled when the user exits the Edit, Interactive menu by the OK
button (commit changes) the rig will be moved to the Target location.
12.10.2 Redene Target
Reference
The Easting and Northing UTM's of the Reference position are displayed as UTM
co-ordinates. These values are taken from the Spread File. Units are UTM's
(metres).
Current Target
The Easting and Northing UTM's are initially set to the Reference co-ordinates
but can be manually replaced by the user. This method is not recommended as
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the likelihood of user error is increased. A preferred method of moving the target
is through the Calculated Target option.
Units are UTM (metres) if the Current Target is entered directly. If the Calculated
Target option is used then units are user specied.
Calculated Target
When this option is selected the Calculate button is enabled and the Easting and
Northing UTM's are not available for the user to directly edit.
Riser Target
Not available in this version of Gmoor32.
OK will save the changes made and close the window. Cancel will discard the
changes and close the window.
Calculate
This button will enable a new window, Relative X-Y Position Calculator, where
the user can calculate a new target location.
Relative To Reference/Target
Choose from the options Relative to Reference or Relative to Target for the reference point to move relative from. For an initial set-up the reference point will
be the same as the Target Point.
Move East/North
Select Move East/North and enter the distances to move the Target East and
North from the reference point. For West and South enter the East and North
values with a negative prex. Units are user specied.
Move Range/Bearing
Select Move Range/Bearing and enter the range and bearing to move the Target
from the reference point. The range is in the user specied units and the bearing
in degrees.
Calculated UTM
The new Target Location is displayed here. Units are in UTM's (metres).
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OK will save the changes made and close the window. Cancel will discard the
changes and close. The Apply button is not activated until changes have been
made to any of the entries.
12.11 Analysis
The user can select the form of Analysis to be run in this tab.
Equilibrium
Equilibrium analysis nds the equilibrium position of the vessel together with the
corresponding line tensions, under the action of the mean environmental force.
Mooring lines may be designated as intact or broken to represent various failure
cases. Associated with the basic equilibrium analysis, GMOOR calculates both
Wave Frequency (WF) and Low Frequency (LF) motions, and if requested will
perform line dynamic analysis. The user has control of the various options through
the 3 check boxes in the lower half of the page, as described below. There are no
options with respect to the WF motions: GMOOR simply calculates signicant
and maximum amplitudes by frequency domain methods.
Transient
Select Transient as the Analysis Method when a time domain transient analysis is
required. This selection will enable the Failure drop down selection box.
Consequence Analysis
Selection of Consequence Analysis is a short cut Batch Analysis using the present
condition. The consequence analysis performs both static and transient runs or
all failures: anchor lines, thrusters and blackout.
12.11.1 Failure
Only active for Transient analysis, the user is able to select which component of
the mooring system has failed. The options available are:Line 1 Break
Line 2 Break
....
Thruster 1 Fail
Thruster 2 Fail
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....
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12.11.2 Dynamic Analysis
H Dynamic
If this box is checked, GMOOR will perform line dynamic analysis for all deployed
lines. The starting information for this analysis consists of vessel oset (eg Mean
+ LFmax), and fairlead WF amplitude and period. This information is set up
according to whichever code check is being applied. The actual analysis is the
transfer matrix method in the frequency domain, and the results are reported on
the Leg Screen.
12.11.3 LF Frequency Domain
If this box is checked, GMOOR will perform a frequency domain calculation of
the LF motion, which takes less than a second. Please see the Vessel Page for a
discussion of the damping, which is crucial to the results.
12.11.4 LF Time Domain
Checking this box invokes a time domain analysis of LF motion, which can take half
a minute or more, depending on the speed of the computer and the parameters
set. The motivation for this analysis is to obtain a better estimate of the LF
motion than can be provided by the frequency domain analysis, since this latter
analysis is unable to disentangle the coupling on the damping. The time domain
has other benets, for example if the mooring force characteristics are signicantly
non-linear over the range of the motion. The user can set the simulation duration
on the Wave Tab of Units and Analysis Settings. The simulation is started with
the vessel in its static equilibrium position, with the object of minimising starting
transients. GMOOR runs the simulation for the specied duration, having rst
run for a 20 minute settling period. The settling period is excluded from the time
history from which the motion statistics are evaluated. Note that the frequency
and time domain check boxes are not mutually exclusive. However if the time
domain box has been checked, it is the results of this analysis which are reported
on the Motions Screen, and used as the basis for the line dynamic analysis.
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Chapter 13
Batch Menu & Batch Dialog
Figure 13.1: Batch Menu
The Batch pull down menu enables the user to run multiple analyses for the chosen
spread and to save those analyses for re-run at a later stage.
The function of the Batch section is to run consequence analyses, with each case
giving results for intact, static single line failure and transient failure cases. In
one batch case all lines are broken in turn, and both single and multiple thruster
failures are analysed. For a typical 8 leg spread with two thrusters operating a
total of 23 cases will be analysed for each environment.
For each Batch case an environment must be input together with other details
such as the vessel draft, tide height, line adjustments, etc. To run an analysis for
all eight cardinal directions, eight cases need to be dened - one for each weather
direction.
The options available are New or Open.
13.1 New - User Dened
Starts creating a new batch input case by displaying the Batch Dialog (g 13.2)
with a single case in it which is a copy of the Interactive condition at that time
13.1.1 Batch Control Dialog
The Batch Dialog displays a list of batch cases and allows the user to Add/Modify
or Delete cases as required and Save the cases to a Batch Input File (*.bif)
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Figure 13.2: Batch Control Dialog
Running Batch Analyses
Enter a batch title for each batch session. A new batch session is created each
time the Run Button is selected. When viewing output from a batch run each
session is given a Batch ID number, which allows cross-referencing of results. Note
that if a consequence analysis is run from the Edit, Interactive menu then it will
be treated as a batch session and will be given a Batch ID number.
Enabled
Only the cases checked (selected) will run in the batch analysis. Click on the check
box to select and deselect.
You can also use the 'Enable All' and 'Disable All' buttons
Case Title & Time Label
The Case Title and Time Label are taken from the Batch Mode Case Title & Time
Label edit boxes (similar layout to Edit, Interactive menu) and are automatically
entered.
Enable All
This button will Enable All of the cases within the batch analysis to be run. A
shortcut method of enabling all the cases for a batch analysis that has a large
number of cases.
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Disable All
This button will Disable All of the cases within the batch analysis to be run. A
shortcut method of disabling all the cases for a batch analysis that has a large
number of cases
Add
This will call up a new window, Batch Mode: New Case, where the details for the
analysis are entered as in the Interactive menu. The functionality of this window
is the same as the Interactive window.
Enter all the details for the environment, mooring lines, thrusters, riser, vessel,
control, etc, and click OK to enter the details into the batch le. Cancel will
discard any changes made and close the Batch Mode New Case window. The
forces button will display the Force + Motion Summary window as described earlier
in the manual.
Use this option to dene an analysis for all eight head, quarter and beam conditions where the variables have been dened for the rst direction. By selecting the
rst dened index and clicking Add the new index will adopt the properties of the
selected index. The user can simply change the details to suit the new direction.
Generate
This will call up a dialog which is a basic batch case generator.
Figure 13.3: Batch Case Generator
The important thing to understand about the generator is that it can generate
cases by that can be dened by specifying start/increment/end for certain parameter(s). For instance you can specify incrementing directions, incrementing
wind speeds, incrementing currents, etc. What you can't presently do is to specify
dierent weather from dierent directions.
There are 2 ways of using the generator
Before calling up the Batch Generator, edit the existing rst case and use it
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as a base case.
Bring up the Batchh Generator and dene the cases there
These are best illustrated by an example.
Suppose we want a series of batch cases where the weather is coincident and
comes from every 30 degrees around the vessel, but the weather is constant, as
follows
Wind Speed = 35 knots
Wave Height= 8 secs
Wave Period= 8 secs
Current Speed=0.5 knots
To produce this you can call up the batch generator and for the rst paramenter
you enter specify the parameter (or one of the paramters) that increments. In
this case you need to specify one of the dorections and we have chosen the wind
direction (see g 13.4)
Pick the parameter from the drop down. Tip The units will be as set in the
interactive condition so make sure they are correct before you start. Type in the
start, increment and end and the number of cases will be calculated automatically
Figure 13.4: Batch Case Generator - stage 1
The rst parameter you enter sets the number of cases to be generated. For the
following cases, that number of cases must be used. We can then ll in the rest
of the parameters as shown in g ??
Once you have all the parameters lled in you can hit the 'Generate' button and
the batch cases will be lled in automatically as shown in gure ??
The alternative way to produce this series of cases is to edit the existing single
batch case in the normal way with the weather required, apart from the directions
which are going to vary. Then when you bring up the batch generator, specify
only the directions as shown in gure 13.7. However, this time check the \Leave
existing last batch case untouched" checkbox. This will use the existing case, with
the weather that you have specied, as the base case for the generation and will
generate extra cases with the weather direction varying.
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GMOOR
Figure 13.5: Batch Case Generator - stage 2
Figure 13.6: Batch Case Generator - stage 3
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Tip The existing batch case becomes the rst generated case, so in the example
you only need to start the generated directions at 30 degrees
Figure 13.7: Batch Case Generator - alternate method
When entering directions, there is a special feature available where you can select
the direction to be down or between mooring lines. Suppose we want the same
weather as above applied down and between the mooring lines. Using the alternate
method, you specify the weather in the rst batch case, as before and then call up
the generator and instead of specifying the start,increment and end in direction,
use the drop down box to select \Down and Between lines" as shown in gure
13.8
Figure 13.8: Batch Case Generator - special directions
Edit
The user can edit a batch mode analysis already created by rst selecting an Index
(existing batch le case) and clicking the Edit button. The Batch Mode window
will be enabled allowing the user to edit the previously entered details. Click OK
to save the changes into the existing batch le. Cancel will discard any changes
made and close the le.
Delete
This deletes the currently highlighted case in the list.
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Make Interactive
It is sometimes useful to be able to check a batch case interactively and this button
can be used to copy the details from the selected Batch case and paste them nto
the current interactive case. Once the Make Interactive button is pressed close
the batch analysis menu and return the selected batch case will now be available
for further interactive analysis.
Run
To Run a Batch analysis with all the selected cases click the Run button. Results
are sent to the output text les and can be view using the Print/Print Preview
commands.
Save
This button allows the user to save the Batch cases dened in a Batch Input
(BIF) File. This le can be used if the batch case has to be re-run, or altered, at
a later date. Note that BIF les created in an earlier version of Gmoor32 are not
guaranteed to work in the latest version.
Restore
This restores batch cases from a previously saved BIF le. You should only attempt
to restore cases from BIF's of the same spread les or a very similar one, The BIF
les are not guaranteed to be Spread independant.
Close
This will close the batch mode window without performing an analysis. The user
will be prompted to save any changes to the batch input le opened or created.
13.2 New - Forecast Based
The user can choose the batch analysis to be run from a forecast e-mail message,
*.MSG. A new window is enabled that allows the user to choose and open a
forecast e-mail message to create the analysis details.
Selecting an e-mail message to run a forecast based batch analysis will open the
Batch Control window as in the User Dened section but with the cases to be run
already dened as Indexes. To run the analysis no editing is required to the cases
simply click the Run button. The analysis will be performed and the user can save
the input and output results as dened in the previous section.
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The functionality is exactly the same as described previously with the user able
to enable/disable, edit (or view), promote and save as the batch forecast. The
average forecast will take between 10 and 20 minutes to run depending on the
speed of your PC.
13.3 Open
This selection will allow the user to Open an existing Batch File (*.BIF). The le
can be held locally or can be accessed from a network drive using the standard
windows commands.
The selected le will be used to open the Batch Mode window with the case
dened.
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Chapter 14
Graphs Menu
Figure 14.1: Graphs Menu
14.1 Vessel Excursion and Point graphs
When a graph has been displayed on screen using one of the following commands it
is possible to alter the scale, axes, colours, etc by using the View, Settings menu.
14.2 Catenary Prole
Selection of the Catenary Prole will enable a new window, Catenary Prole Details, where the user can select which catenary is to be plotted.
Click OK to plot the selection or Cancel to close the window and return to GMOOR
main view.
The Catenary Prole is displayed in a new window which remains active until
closed. The user can switch back to the Main view by the Window drop down
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menu, or can print the plot from File - Print.
Mooring Line Number
Select the mooring line number to be plotted from the selection box. All intact
lines dened in the Spread File are available to plot.
Tensions
Choose between the options of Present or User Dened to plot tensions on the
graph. The default number of plots produced by GMOOR is 5 and will cover the
normal working range of the line tension, these are non-editable to the user in
Present mode.
Selection of User Dened will enable the further edit boxes where the user can
dene the mooring line number and each line tension individually. The default
value for Gmoor32 is Present.
Number of Tensions (MAX 5)
Enter the number of tensions you wish to plot for the chosen mooring line. The
tensions will be plotted in chronological order.
Enter the tensions to be plotted in chronological order in the boxes Tension 1 to
Tension 5. Boxes with details entered outside the Number of Tensions chosen will
not be displayed.
14.3 Line Load Excursion
Selection of the Line Load Excursion will enable a new window, Line Load Excursion Curve Details, where the user can select the line of interest.
Click OK to plot the selection or Cancel to close the window and return to
Gmoor32 main view.
The Line Load Excursion graph is displayed in a new window which remains active
until closed. The user can switch back to the Main view by the Window drop
down menu, or can print the plot from File - Print.
14.4 Vessel Load Excursion
Selection of the Vessel Load Excursion will enable a new window, Vessel Load
Excursion Curve Details, where the user can enter the weather direction and lines
of interest.
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Click OK to plot the selection or Cancel to close the window and return to the
Gmoor32 main screen.
The Vessel Excursion is displayed in a new window which remains active until
closed. The user can switch back to the Main view by the Window drop down
menu, or can print the plot from File - Print.
Absolute Load Direction (to)
Enter the absolute direction for environmental load to act upon the vessel, the
default value is the vessel heading. The units are in degrees.
Maximum Load
Enter the maximum load to be applied to the vessel using the user specied units.
Number of Tensions (MAX 5)
Enter the number of mooring lines to be plotted. The maximum is 5.
14.5 Point
Selection of the Point graph will enable a new window, Height or Depth of Point
verses Tension, where the user can select which line is to be plotted and how the
plot is dened.
Click OK to plot the selection or Cancel to close the window and return to the
GMOOR main screen.
The Point Tension graph is displayed in a new window which remains active until
closed. The user can switch back to the Main view by the Window drop down
menu, or can print the plot from File - Print.
Mooring Line Number
Select the mooring line to be plotted from the selection box.
Minimum Tension
Enter the minimum tension for the mooring line to be plotted. The units are user
specied.
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Maximum Tension
Enter the maximum tension for the mooring line to be plotted. The units are user
specied.
Reference Point
Choose from the selection box the reference point, Fairlead or Anchor, for the
tension point to be plotted against depth/height.
Distance from Fairlead/Anchor
Enter the distance from the reference point (fairlead or anchor)for the point tension to be plotted using the user specied units.
14.6 Save Graph As
All graphs can be saved electronically as a Bitmap le using the Save Graph As
command from the Graphs drop down menu. The selection of this command,
when a graph is active, will activate a new window where the user can browse and
save the graph using the standard Windows functions.
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Chapter 15
Data Files
The following sections describe the data les required for running Gmoor32. A set
of example data les is included with the program and these les are described in
detail.
15.1 Introduction
Before Gmoor32 can be run details of the vessel, its mooring equipment, the spread
and the location at which it is operating must be available in the form of data les.
Four les are needed, one which denes the spread arrangement, the SPREAD
FILE, two which dene the vessel properties/geometry, the VESSEL FILE and
PLAN FILE and one which denes the eld, the FIELD FILE. If a riser is present
in the analysis a fth le must be included to dene the properties/geometry of
the riser, the RISER FILE.
The rst two of these les the Spread File and the Vessel File are compulsory the
rest are optional.
The rst time user is advised to run the program initially using the sample data
les provided. If you are now about to use the program for the rst time with
your own data then read the following sections carefully. These describe the
preparation of SPREAD, VESSEL, PLAN, FIELD and RISER FILES respectively.
This section introduces the terminology and conventions used by Gmoor32 and
outlines an example mooring problem which is later described in detail. This
problem is hypothetical and is used to illustrate features of the program.
On a semi-submersible vessel the mooring lines lead from anchors embedded in the
seabed through pulley wheels to a tensioning device. The pulley wheels are known
as FAIRLEADS and the tensioners as LIFTERS, WINDLASSES or WINCHES.
The mooring lines may be single component CHAIN, WIRE ROPE or even SYNTHETIC FIBRE ROPE or a number of components of dierent types. Between
each component there may be a heavy weight (SINKER), a BUOY or just a
shackle.
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If the dynamics of the mooring lines are neglected then the tension depends only
upon the line properties of WEIGHT PER UNIT LENGTH and ELASTICITY, the
LINE LENGTH and the distance from the anchor to the fairlead.
The eects of the moorings on the vessel depend upon where the lines are attached
to the vessel, the directions of the lines and the tensions. The directions of the
lines are dened by the placing of the anchors - ANCHOR PATTERN. In general
a symmetric pattern is desirable.
The axis convention Gmoor32 uses for dening points on the vessel is shown in
Figure 2. It is a right handed convention with X positive to Starboard, Y positive
Forward and Z positive upward. The origin for the vessel axis system is nominally
the plan position of the centre of gravity at the keel. You may normally assume
that the centre of gravity is on the centreline amidships. Minor deviations of the
centre of gravity from the assumed position will only aect transient analyses and
then only by a small amount.
The convention for line component numbering is that the rst component is always
at the anchor and the last component at the vessel.
Note that Gmoor32 data can be entered in either Metric or Imperial units provided
that consistency is maintained for the input units chosen within a particular le.
(i.e. all Metric or all Imperial). Conversion between units is a built-in facility of
the program. The output units are user specied within Gmoor32.
Separate les may have dierent units e.g. the Spread File may be in metric units
whilst the Field File may be in Imperial units. In the Field File some plans may
be entered in Imperial units and others may be entered in Metric units. The data
preparation forms are explicit where this option is available.
Entering and Checking Data Files
This is done using a text editor (eg NOTEPAD) or word processor, typing in the
data in the manner described later in this section. If a word-processor program is
used then make sure you do not use it in a mode that formats the text by including
special characters. Always save as plain ASCII les or Gmoor32 may reject the
data.
Text Data
As mentioned in the preceding sections whenever text input is required - either for
lenames or descriptions - a maximum number of characters is specied. If you
enter less than this number then the remaining characters are taken as spaces. Any
extra characters above the limit will be ignored and will not appear in the printout
from the program run. Take care when using special characters, in particular do
not use the double quote character " in a line of text, this can cause problems
when generating output.
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Numerical Data
Numbers may be entered as INTEGERS (whole numbers e.g. 12) DECIMALS
(e.g. 7.322) or in EXPONENT format (e.g. 0.723E+1). The total number
of characters in the number must not be greater than 14 characters in length
including the decimal point and any spaces preceding the number.
Unless a data item is clearly an integer such as the number of lines or the number
of components it is strongly advised that the decimal point is included e.g. `X
co-ordinate' write `47.0' rather than `47'.
Integer values should, of course, be written as integers, e.g. `Number of blocks'
write `7'. If you enter it as 7.0 Gmoor32 will still read it correctly however.
Multiple Items On A Line
Where more than one item of data is entered on a single line, a comma must
separate each item and the line must be terminated by pressing the Return or
Enter key. A comma should not follow the last item on a line. There should
always be a blank line at the end of all data les.
15.2 The SPREAD (*.SPD) File
The Spread File contains all the data relating to the make up of the mooring lines
and the position of the vessel and anchors.
The le is the main data le for Gmoor32 and contains references to the other
data les used when running an analysis. The example le G 32 EXAM:SP D is
described in detail.
File Creation Details
Enter text up to a maximum of 40 characters to describe the overall spread (contained in the data le). The number of characters including intermediate spaces
may be less than 40, but those in excess of 40 will be ignored. For our example
le we have entered:EXAMPLE SPREAD CVF
Custom Vessel Data File (*.CVF)
Enter the name of the Custom Vessel File to be used for the analysis. The le
name must be prexed with *CVF and long le names are supported. Gmoor32 will
look for this le name with the extension `CVF' added. Do not enter the extension
`.CVF'. In the example the Custom Vessel File is called `G32 EXAM.CVF' thus
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*CVF G32_CUSTOM
At run time this le (G32 EXAM.CVF) must be in the same data directory as the
Spread File.
Global Maritime Ltd produces the Custom Vessel File (CVF) in-house as a service.
The le in a binary format cannot be created without MAKECVF, an in-house utility, and is directly used by Gmoor32 to dene the force and motion characteristics
of the vessel.
Vessel Data File (*.VSL)
As an alternative to the CVF a Vessel File (*.VSL) may be used. The Vessel File
does not contain environmental force and motion characteristics. Consequently
wind speeds, wave heights, etc, cannot be entered and the environmental force
acting on the vessel must be entered explicitly.
If a Vessel File (G32 VESSEL.VSL) is to be used then the *CVF prex is not used
and the entry is:G32_VESSEL
See the example Spread File G32 VSL.SPD.
Field Data File (*.FLD)
Enter the name of the eld data le to be used for the analysis. If no le extension
is given, Gmoor32 will look for this le name with the extension `.FLD' by default.
In the example the eld le has been called `G32 FIELD.FLD' thus the entry is:G32_FIELD
At run time this le (G32 FIELD.FLD) must be in the same data directory as the
Spread File. If you don't wish to use the eld plotting option enter *NONE in
place of the eld data le name.
The eld le can be a DXF or DWG le. This can be specied by including the
le extension in the led le name. for example :G32_FIELD.DWG
Alternatively, the older way to do it is to us the keyword *DXF or *DWG in front
of the lename, for example :*DXF G32_FIELD
,which will look for a le G32F IELD:DXF:
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Riser File (*.RSR) (optional)
Enter the name of the riser data le to be used for the analysis. The le name must
be prexed with *RISER. Gmoor32 will look for this le name with the extension
`.RSR' added. Do not enter the extension `.RSR'. For example the riser le may
be called `G32 Riser.RSR' thus the entry is:*RISER G32_Riser
At run time this le (G32 Riser.RSR) must be in the same data disc/directory as
the Spread File.
If no riser is present this line may be omitted from the Spread File.
Units Options
Gmoor32 allows the choice of working in either METRIC or IMPERIAL/USA units.
METRIC units are METRES, TONNES and SECONDS and are selected by entering 1. IMPERIAL/USA units are FEET, KIPS and SECONDS and are selected
by entering 2. Entering any other number will result in the program rejecting the
data le and giving an error message.
The units chosen here will be the default units used for the analysis and output.
The user can specify the units to be used at run time using the Options Menu of
Gmoor32. In the example the units are METRIC so 1 is entered as the default
units.
Range/Bearing Option
Gmoor32 allows the anchor positions to be set relative to the centre of the vessel
or relative to individual fairleads. In both cases the vessel is assumed to be at the
reference position and heading. Thus the two options are from the REFERENCE
(TRUE) and RELATIVE To FAIRLEAD.
The REFERENCE POSITION option is selected by entering 1. For this option
the RANGE is the distance of the anchor from the REFERENCE POSITION of
the vessel. The BEARING of the anchor is the angle relative to TRUE NORTH
(in degrees) of a line drawn from the REFERENCE POSITION to the anchor.
Note that as with all bearings the angle is positive clockwise.
The FAIRLEAD option is selected by entering 2. This option requires the RANGE
to be specied from the FAIRLEAD and the BEARING of the line to be relative
to the initial heading of the vessel. In the example the option is set to 2 so the
range and bearing of the anchors is relative to the fairleads.
Reference Position
Enter the desired REFERENCE POSITION and HEADING of the vessel. The
HEADING is measured clockwise from TRUE NORTH. The VESSEL ORIGIN is
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taken to be the position of the vessel CG and for most vessels it can be assumed
to be on the centreline amidships. In this case the vessel is at co-ordinates 100
East and 0 North and on a heading of 0 degrees thus the required entry is
100.0, 0.00, 0.00
The Reference Position and Target Position are the same initially but the Target
Position may be altered at run time if required.
Water Depth At Vessel
H SLOPE
This line contains the water depth at the initial position of the vessel. Optionally,
this value of water depth may be preceded by the keyword *SLOPE. In the absence of this keyword, the seabed slopes at the anchors are calculated from the
dierences between the depths at the anchors and the vessel. If this keyword is
present, seabed slope and line status are read from the spread le at the same
time as the ranges, bearings and depths at the anchors. For the details of this,
please see the subsection below on seabed slope.
It is usual to reference the depth to LAT (Lowest Astronomical Tide) although
any other suitable datum may be used if preferred. In the example a water depth
of 1000.0 metres is used. At run time the water depth at the vessel will always
be taken as this value plus the tide height irrespective of where the vessel may be
moved.
Initial Tide Height
Tide height must be entered using the same reference datum as that used for
water depth. The height may be varied at run time to examine the behaviour of
the moorings for example at High Water or Low Water or any intermediate tidal
elevation. In the example we dene an initial tide height of zero - enter 0. Note
that the eects of tide height are only signicant if it is an appreciable percentage
of the water depth - more strictly the dierence in elevation between the fairlead
and the anchor (not applicable in this example) .
Vessel Draft
The draft of the vessel is usually measured from the keel (underside of pontoons)
and does not normally include appendages such as thrusters. The value entered
here should lie within the range of vessel drafts specied in the Vessel File i.e.
the draft should be greater than or equal to DRAFT NO. 1 (usually the survival
draft) and less than or equal to DRAFT NO. 3 (usually the operating draft). It
is normal practice to set the initial vessel draft to the survival value. If the value
entered is outside the limits in the vessel le the closest limit value will be used by
the program. In this example an initial draft of 19.81 metres is entered.
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N.B. Under-keel clearance may be a matter to be considered separate to the
Gmoor32 program. Gmoor32 makes no check on clearance after input but the
program will halt and give an error message if at any time a fairlead is below the
seabed at the vessel.
Number Of Mooring Legs
Enter the number of mooring legs (lines) in the spread. Up to 20 legs are permitted
in the standard version of the program and normal practice is to number clockwise
from the forward starboard leg, although any suitable designation may be used.
The numbering convention used in Custom Vessel Files is dened in the validation
report for the vessel. In the example there are 8 mooring lines as shown.
Number Of Leg Types
Each mooring leg can have a dierent conguration of line components - e.g.
dierent sizes, materials, buoys or sinkers. More often than not all legs are identical. The details of the conguration are entered later - the number of dierent
congurations (TYPES) which will be specied is entered here. In the example
we have used two leg types thus we enter 2. The maximum number of leg types
permitted is 20.
Leg Number
The LEG NUMBER tells Gmoor32 to which fairlead the anchor is connected. The
numbering system is the same as used in specifying the fairlead co-ordinates in the
Vessel File i.e. the program will attach mooring leg 1 (dened here in the Spread
File) to the fairlead 1 (dened in the Vessel File) and so on. It is not necessary
to deploy every line on the vessel - if a winch isn't used just omit that leg number
from the list of anchor positions. Note that the leg numbers must be dened in
ascending order or Gmoor32 will give a `sequence error' message.
Type Number
As described above each mooring leg can have a dierent composition or TYPE.
In the example spread provided two leg types are dened so either 1 or 2 can be
entered.
Anchor Range, Bearing
The position of the anchor is specied by the RANGE (distance) and BEARING
in degrees. If the anchor range is entered as a negative number then Gmoor32
will assume that the line payout and pretension dene the range of the anchor.
The anchor will be positioned so that the payout is equal to the value entered for
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the range (ignoring the - sign) at the required pretension. The pretension must
be specied as dened under PAYOUT/PRETENSION below.
Leg one has -2275.0 entered for the range and therefore the line payout will be set
at 2275m and the range will be calculated by Gmoor32. The bearing is entered as
22.5 for the rst leg and the others follow at 45 degree increments.
Water Depth At Anchor
Enter the water depth at the anchor position referenced to the same datum as
used previously for water depth at the vessel. Since there is no seabed slope in
the example this is the same as the water depth at the vessel. 1000.0 is entered
for all water depths at the anchors.
Following these items there are 3 optional elds. These are only read if the
*SLOPE option is given. If you save a spread le that you have created manually,
it will automatically add the *SLOPE option and these 3 elds, with their default
values, if they were not specied initially.
Sea Bed Slope (Optional - dependant on *SLOPE)
If the keyword *SLOPE has been entered on the line of data containing the depth
at the vessel (see above), then seabed slope and line status should be entered here.
The value of slope in degrees should be entered, with a positive value indicating
a rise towards the vessel. The line status is an integer in the range 1 to 14.
The motivation for setting statuses other than intact at the start of a run is
to represent umbilicals between the vessel and a platform, which remain xed in
payout despite any moves or changes in environmental force. Status 14 (FIXD will
appear on screens and printout representing FIXED) has been introduced, which
if set, guarantees that Gmoor32 does not change the payout of these lines during
moves. For an umbilical free hanging from an attachment point on the platform
which is above the water line, set the water depth at the anchor to minus the
height of the attachment point above the water, and set the seabed slope to -89.9
deg. For genuine mooring lines, set the status to 1.
Line Status - (Optional - dependant on *SLOPE)
This is an optional eld that normally only gets created by the spread editor. It
gives the status of the line.
0 not deployed
1 intact (default))
2 broken
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Adjustable Payout - (Optional - dependant on *SLOPE)
This is another optional eld that normally only gets created by the spread editor.
It gives the adjustable component length of the line
This is used temporarily by the spread editor and should not normally be manually
included as it can cause problems by over-riding the payout/pretension given in
the leg type information.
Type Number
Type Number denes each mooring leg type by the arrangement and properties of
each line component. For each type cited in the arrangement the relevant type
details must be given. The total number of types dened thus must equal the
NUMBER OF LEG TYPES entered. You must start with TYPE number 1 and
enter the details for each type sequentially. No type numbers may be skipped.
Number Of Components
Each line can comprise a number of dierent component cables. For example a
vessel may have wire rope at the winches and a length of chain at the anchors.
The maximum number of components permissible in the standard version of the
program is 10. In practice it is unusual to use more than 3 components.
Anchors, sinkers and buoys are not included in the number of components. A
typical 3 component line might consist of ground chain, wire, and chain at the
winches. At the connection between each component Gmoor32 allows a buoy or
sinker to be inserted as dened below. In the example each leg of the moorings
has two components so the value 2 is entered.
On the same line of data after the number of components, the keyword *BUOYFIX may optionally appear. The presence or absence of this keyword determines
how Gmoor32 handles any buoys in the leg, as described in the section below on
waterplane area.
H BUOYFIX
Adjustable Component
The components are numbered from 1 starting at the anchor. Normally the
last component is specied as adjustable corresponding to the line from on-board
winches but if, for example, there are tensioning barges it could be an intermediate one. One, and only one, of the components must be specied as adjustable
in every leg of the mooring. In the example there are two components so the
adjustable component is 2 as shown.
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Total Length Adjustable
Enter the total length of line available for the adjustable component. This will
normally be the length of line available onboard before setting anchors - the wire
on the winch drum or the amount of chain in the lockers. If any pre-layed lines
are not dened as separate components then their length should be included in
the total. This line length is used to check that any payout adjustments made are
within that available. If an attempt is made to exceed the line length available the
program will warn you and use the maximum. In the rst example the vessel has
a total wire capacity of 5000m so the entry here is 5000.0.
Description
This is used to describe the component and is for subsequent easy identication
and checking of the spread le. The maximum number of characters permissible,
including spaces, is 20. Any characters in excess of 20 will be ignored. It is
recommended that you use this description to indicate the size and type of each
component. In the example the mooring lines are made up of two components,
the rst 4.5inch Oil Rig Quality chain and the second is 3.5inch wire. The entries
are:4.5inch ORQ Chain -(1st component)
3.5inch (89mm) Wire -(2nd component)
Payout Or Pretension
The length of each component should be entered here. Do not forget that the
units must be as specied by the UNITS OPTION. For the SINGLE ADJUSTABLE
COMPONENT you may optionally enter the required initial pretension preceded
by a minus sign. Pretension cannot be set for other components that are not
adjustable. Note that the program will not allow a component to become less
than 1 unit long. If you attempt to set a total payout which would result in the
component becoming shorter than 1 unit the program will warn you and set the
adjustable component length to 1 unit.
Similarly if the payout or pretension requested would result in the adjustable line
length exceeding the maximum length available the program will warn you and use
the maximum.
Since the example suggests setting the pretension (under no external loads) at
approximately 20% of the breaking load the entries here are:500 (1st component - payout)
-90.0 (2nd component - pretension)
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Line Weight Per Unit Length
Enter the appropriate weight per unit length of the component. Unless the line is
to shore it will be submerged and the submerged weight must be used. For steel
chain in sea water (of density 1.025 t/m3) the submerged weight can be found
by multiplying the weight in air by 0.87. For wire values of this factor range from
0.87 downwards, commonly 0.84-0.81 is used to allow for lubricant within the wire
bundles. The weight in air can be obtained from manufacturer's catalogues and
some useful values are given in Tables 1 and 2.
From Tables 1 and 2 the submerged weight of 4.5inch chain is found to be 0.247
tonnes per metre and 89mm wire is 0.0288 tonnes per metre. The values used in
the example are specic to the actual chain, 0.259, and wire, 0.028, aboard the
vessel.
Breaking Load
Enter the breaking load for the component. This will normally be the MINIMUM
BREAKING LOAD given in the catalogue. It may be that lower values apply if
the lines are old or have been down-rated by a classication or certication society
in which case these lower values apply. Table 1 gives the value of chain at 975
tonnes (933.5 tonnes used) and Table 2 gives the value of wire at 518 tonnes
(503.4 tonnes used).
Diameter
(mm)
73
76
78
81
84
87
90
92
95
97
100
102
105
107
111
114
117
120
Dry
Weight
(t/m)
0.117
0.126
0.133
0.144
0.155
0.166
0.177
0.185
0.198
0.206
0.219
0.228
0.241
0.251
0.270
0.285
0.300
0.315
Immersed
Weight
(t/m)
0.101
0.110
0.116
0.125
0.134
0.144
0.154
0.161
0.172
0.179
0.190
0.198
0.210
0.218
0.235
0.247
0.261
0.274
Elasticity EA Grade 2
(t)
47800
51800
54600
58800
63300
67900
72600
75900
80900
84400
89700
93300
98900
102700
110500
116500
122700
129100
284
306
321
344
367
392
416
433
459
476
503
521
548
567
604
633
662
692
Breaking Load (tonnes)
Grade 3
ORQ
NVK4
406
438
459
492
526
560
596
620
656
681
719
745
784
811
865
906
947
990
437
471
494
529
566
603
641
667
707
733
774
802
844
873
931
975
1020
1065
Table 15.1: Chain Properties
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568
612
642
688
735
783
833
866
918
952
1006
1041
1096
1133
1209
1266
1324
1384
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Wire Size Dry
(mm)
Weight
(t/m)
51
0.0110
54
0.0123
58
0.0142
60
0.0152
64
0.0173
67
0.0190
71
0.0213
74
0.0232
77
0.0251
80
0.0271
83
0.0291
87
0.0320
90
0.0343
96
0.0390
102
0.0440
Immersed
Weight
(t/m)
0.0092
0.0104
0.0120
0.0128
0.0146
0.0159
0.0179
0.0195
0.0211
0.0227
0.0245
0.0269
0.0288
0.0327
0.0370
British
Ropes
ELASTICITY EA (t)
NMD new NMD old
12300
13700
15900
17000
19300
21200
23800
25800
27900
30200
32500
35700
38200
43400
49000
14600
16300
18900
20200
23000
25200
28200
30700
33200
35900
38600
42400
45400
51600
58300
20400
22900
26400
28200
32100
35200
39600
43000
46500
50200
54100
59400
63600
72300
81600
Breaking
Load
(tonnes)
180
200
224
249
274
299
333
361
389
417
447
487
518
585
665
Table 15.2: Wire Rope Properties
Line Friction Coecient
Enter the coecient of friction between the line component and the seabed. This
depends on both the line (chain or wire) and the seabed composition. The following
guidance on friction coecients is given in API RP2SK:
Start Slide
Chain 1.0 0.7
Wire 0.6 0.25
Table 15.3: Friction Coecients
The NORWEGIAN MARITIME DIRECTORATE recommends a value of 1.0 for
all seabed conditions as has been entered for the rst component. 0.6 has been
entered for the second component.
Density
H Dynamic
This is required for dynamic analysis only and may be omitted for quasi-static
analyses.
Enter the density of the line component material (for steel wire and chain this is
7:85t=m3 . Units are t=m3 or kips=f t 3 .
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Nominal Diameter
This is required for dynamic analysis only and may be omitted for quasi-static
analyses. Enter the nominal diameter of the line component. Units are metres or
feet. The nominal diameter is used to calculate the drag forces acting on the line
component when combined with the drag coecient.
H Dynamic
Drag Coecient, Cd
This is required for dynamic analysis only and may be omitted for quasi-static
analyses. Enter the drag coecient for the line component. Recommended values
for the drag coecient can be found in API RP2SK or POSMOOR. API RP2SK
recommends Cd of 1.2 for wire and 2.4 for chain based on the nominal diameter.
POSMOOR (Jan 1996) gives values of 1.8 for wire and 2.6 for chain, without
marine growth, and based on nominal diameter.
H Dynamic
Added Mass Coecient, Cm
This is required for dynamic analysis only and may be omitted for quasi-static
analyses.
Enter the added mass coecient for the line component. The total hydrodynamic
mass is calculated based on the formula Mtotal = M (1 + Cm ). The value entered
will therefore normally be 1.0.
H Dynamic
Number of Segments
This is required for dynamic analysis only and may be omitted for quasi-static
analyses.
The dynamic analysis routine models the mooring line using the lumped mass
method. This method splits the mooring line into a number of discrete segments,
each with an associated mass and stiness. The accuracy of the solution depends
on the number segments used. For guidance 20 to 30 segments should be adequate
for most common mooring line arrangements.
H Dynamic
Elastic Coecients Of Component
Normally line elasticity can be assumed to be linear, i.e. the component stretch is
directly proportional to the tension. Gmoor32 requires the stiness of each component to be specied. The stiness is simply the product of the CROSS SECTIONAL AREA (A) of the component and the EFFECTIVE ELASTIC MODULUS
(E) of the line material.
NMD recommend that:For STEEL WIRE ROPE E = 9:8 1010 N=m2
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(N.B. a lower value of 7:0 1010 N=m2 is allowed for new wire)
For CHAIN E = 5:6 1010 N=m2
Since sizes are usually given in mm or inches the following equivalent formulae
may be useful and have been used in making up Tables 1 and 2.
When the nominal diameter (d) is in millimetres
NEW WIRE ROPE EA = 5:604d 2 Tonnes
NORMAL WIRE ROPE EA = 7:846d 2 Tonnes
CHAIN EA = 8:967d 2 Tonnes
When the nominal diameter (d) is in inches
NEW WIRE ROPE EA = 7970d 2 kips NORMAL WIRE ROPE EA = 11160d 2
kips CHAIN EA = 12760d 2 kips
For wire rope and chain the elasticity should be assumed to be constant and thus
the second and third coecients set at zero.
The purpose of the second and third coecients is to enable accurate analysis
with component materials having non-linear characteristics. Synthetic ropes become stier at high tensions and this has a marked eect on the mooring system.
Gmoor32 allows this behaviour to be modelled by assuming that the component
elasticity is given by the formula:EA = EA1 + EA2 T + EA3 T 2
As mentioned above, constant elasticity is obtained simply by setting the coecients EA2 and EA3 to zero. The value of the coecients for a non-linear elastic
material can be found by tting a polynomial to the material load-extension curve.
However, because of hysteresis eects it is often be suciently accurate to enter
an equivalent linear elasticity over the range of tensions of most interest.
From the above for 114mm chain and 89mm wire we nd:EA = 8.967 x 902 = 116535 tonnes (116500 tonnes used)
EA = 7.846 x 892 = 62148 tonnes (62100 tonnes used)
Sinker Weight (Buoy Net Buoyancy)
At the SEAWARD end of each component Gmoor32 allows the inclusion of a
SINKER or, with certain restrictions, a BUOY. The SINKER may be just a shackle,
whose weight is negligibly dierent from the line weight, in which case zero may
be entered here. Alternatively it may be a CLUMP WEIGHT or an ANCHOR
whose weight and holding power is substantial. Thus enter the SUBMERGED
WEIGHT in the appropriate units. Gmoor32 accounts for the HOLDING POWER
(FRICTION) of SINKERS by reducing the tension in components seaward of the
sinker which also aects line stretch. It does not matter if you do not specify an
anchor for the rst component since Gmoor32 does not check holding power - it
is assumed that the ANCHORS DO NOT DRAG.
A BUOY may be placed at the seaward end of a component if the component is
connected to the fairlead or if there is another buoy at the other end (towards the
vessel) of the component (no sinker is permitted on components between a buoy
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and the fairlead.). At present there are restrictions on the length of each component to which a buoy is tted. Since Gmoor32 does not check for intermediate
grounding, the length is limited to twice the water depth at the vessel. If you try
to go above this value the program will give an error message and set the maximum allowable value. The size of the BUOY is dened by its NET BUOYANCY
when fully submerged. This must account for the self-weight of the buoy in air
and the submerged weight of any pennant connecting it to the shackle between
adjacent components. A BUOY is treated as a sinker of negative weight. The net
buoyancy entered must be preceded by a minus sign to inform the program that
this is a buoy.
In the example there are two leg types each with two components. The rst leg
type has only a shackle joining the rst (chain) and second (wire) components.
The values entered are 0.0 for the shackle and the anchor can also be entered as
0.0, as it really doesn't matter what value is entered although it may be used in
future releases of the program.
The second leg type has a buoy between the chain and wire components. The
value entered for the buoyancy is -20.0.
Sinker Friction (Mean Waterplane Area)
For a SINKER (clump weight) enter the coecient of friction between the sinker
and the seabed. For an anchor this is the holding power and is generally greater
than 1. Typical holding powers range from 2 with primitive anchors in poor soils
to over 20 for modern anchors in good holding ground. 10 is often assumed to
be a reasonable estimate. With a single component line the value is at present
irrelevant since there are no checks on holding power. As in the case of anchor
weight we suggest, however, that you get in the habit of dening a reasonable
value. In our example the value was set to 0.0 for the rst component.
For a BUOY enter the mean waterplane area as illustrated in Appendix 1. In
the absence of keyword *BUOYFIX, Gmoor32 will calculate an eective freeboard
for the buoy assuming a constant waterplane area and will calculate the required
draft every time the line tension alters. For tensioning barges or similar very large
buoys there can be numerical problems in nding a solution - the heave stiness
of the barge is disproportionately greater than that of the catenaries. For these
situations, include the keyword *BUOYFIX, and Gmoor32 will assume that the
buoy is xed in draft at the surface, regardless of the values entered for buoyancy
and waterplane area. Note that this option is only available where there are 2
components, multiple components from the tensioning barge are not permitted.
In our example a buoy is present in leg type 2 and a value for the second component
is set to 5.0. (5 square metres)
Eective Buoy Pennant Length
If a SINKER is tted this entry is irrelevant and it is recommended that you enter
a zero. If a BUOY is tted then enter the EFFECTIVE PENNANT LENGTH.
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This is dened as the distance from SWL (Still Water Level) to the component
shackle with the BUOY FLOATING FREELY AND PENNANT ATTACHED. This
means the buoy is taking its own weight and that of the pennant but is NOT
CONNECTED TO THE MOORING LINE ITSELF.
In the example the buoy is xed directly to the joining shackle and therefore the
value entered is 0.0.
Density
H Dynamic
This is required for dynamic analysis only and may be omitted for quasi-static
analyses.
Enter the density of the sinker/buoy. Units are tonnes=m3 or kips=f t 3 .
Projected Area
H Dynamic
This is required for dynamic analysis only and may be omitted for quasi-static
analyses.
Enter the projected area of the sinker/buoy. Units are m2 or f t 2 .
Drag Coecient, Cd
H Dynamic
This is required for dynamic analysis only and may be omitted for quasi-static
analyses.
Enter the drag coecient for the sinker/buoy.
Added Mass Coecient, Cm
H Dynamic
This is required for dynamic analysis only and may be omitted for quasi-static
analyses.
Enter the added mass coecient for the sinker/buoy. The total hydrodynamic
mass is calculated based on the formula Mtotal = M (1 + Cm ).
Separate Leg Files
Alternatively spread les may reference leg data held in separate les with a .LEG
lename extension. The special keyword *LEG may then be used in the spread
le to assign a leg type having the properties dened in a named .LEG le. The
syntax is:*LEG n lename
where:
n = Type Number (integer)
lename = name of le with the leg details (*.LEG)
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The data in the *.LEG le should be in the same format as would be given in
the .SPD le, with the addition of two header lines. The rst line containing a
descriptive title (up to 40 characters), and the second line giving the units ag
for the data (1 for metric or 2 for imperial). An example le (LEGTYPE3.LEG)
is listed in table 15.4. Note that the Type Number given in the data (item 1 line
3) will be overridden by the Type Number specied with the *LEG keyword in the
spread le.
Two part line with BUOY
1
3, 2
2, 2000.0
76mm ORQ Chain
1500.0, 0.112, 471.0, 1.0
51800.0, 0.0, 0.0
15.0, 10.0, 0.0
77mm Wire Rope
100.0, 0.0216, 390.0, 0.2
33200.0, 0.0, 0.0
-70.0, 10.0, 50.0
Table 15.4: Example LEG File
15.3 Example SPREAD (*.SPD) File
/* THIS IS A COMMENT LINE */
/* Note that comments are commenced with / and * and ended with
* and / -Note also that they can extend over several lines blank lines are also ignored and can therefore be used to
clarify file layout */
EXAMPLE SPREAD FILE /* Title must be non-blank */
*CVF G32_EXAM /* CVF File */
*RISER CVB1 /* Riser File (optional) */
G32_EXAM /* Field File */
1 /* Metric units */
2 /* Range bearing option - from Fairlead */
100.00, 0.00, 0.0 /* Target position XTARG, YTARG, THTARG */
1000.0 /* Water Depth at Vessel */
0.0 /* Tide height */
19.81 /* Initial Draft */
8 /* Number of Legs */
1 /* Number of Leg Types */
/* Leg No, Type, Range, Bearing, Depth at Anchor */
1, 1, -2275.0,
22.5, 1000.0
2, 2, -2275.0,
67.5, 1000.0
3, 2, -2275.0, 112.5, 1000.0
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4, 1, -2275.0, 157.5, 1000.0
5, 1, -2275.0, 202.5, 1000.0
6, 2, -2275.0, 247.5, 1000.0
7, 2, -2275.0, 292.5, 1000.0
8, 1, -2275.0, 337.5, 1000.0
1, 2 /* Type Number, Number of Components */
2, 5000.0 /* Adjustable Component, Total Length */
4.5inch API ORQ Chain /* Description - Component 1 */
/* Payout, Weight, Break Load, Friction,
Density, Diameter, Cd, Cm, Segments */
500.0, 0.259, 933.5, 1.0 , 7.85, 0.114, 2.4, 1.0, 20
116500.0, 0.0, 0.0 /* EA, Quadratic, Cubic */
0.0, 0.0, 0.0 /* Sinker Weight, Sinker Friction, Not Used */
3.5inch (89mm) Wire /* Description - Component 2 */
/* Pretension, Weight, Break Load, Friction,
Density, Diameter, Cd, Cm, Segments */
-90.0, 0.028, 503, 0.6, 7.85, 0.089, 1.2, 1.0, 20
62100.0, 0.0, 0.0 /* EA, Quadratic, Cubic */
0.0, 0.0, 0.0 /* Sinker Weight, Sinker Friction, Not Used */
/* Sinker Added to this Leg Type */
2, 2 /* Type Number, Number of Components */
2, 5000.0 /* Adjustable Component, Total Length */
4.5inch API ORQ Chain /* Description - Component 1 */
/* Payout, Weight, Break Load, Friction,
Density, Diameter, Cd, Cm, Segments */
500.0, 0.259, 933.5, 1.0, 7.85, 0.114, 2.4, 1.0, 20
116500.0, 0.0, 0.0 /* EA, Quadratic, Cubic */
0.0, 0.0, 0.0 /* Sinker Weight, Sinker Friction, Not Used */
3.5inch (89mm) Wire /* Description - Component 2 */
/* Pretension, Weight, Break Load, Friction,
Density, Diameter, Cd, Cm, Segments */
-90.0, 0.028, 503, 0.6, 7.85, 0.089, 1.2, 1.0, 20
62100.0, 0.0, 0.0 /* EA, Quadratic, Cubic */
/* Weight, Friction, Pennant Length,
Density, Projected Area, Cd, Cm */
20.0, 10.0, 0.0, 2.4, 5.75, 2.0, 1.0
15.4 The VESSEL Files
The CUSTOM VESSEL FILE is in a binary format and is created using the utility
program MAKECVF. A CVF can either be produced as a service by Global Maritime or MAKECVF can be purchased. The CVF contains all the force, motion
and geometric characteristics of the vessel and allows the user to enter weather
conditions into Gmoor32 rather than environmemtal forces.
As an alternative to the CVF a Vessel File (*.VSL) may be used. The Vessel le
does not contain environmental force and motion characteristics. Consequently
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wind speeds, wave heights, etc, cannot be entered and the environmental force
acting on the vessel must be entered explicitly.
A signicant portion of the Vessel File and the Custom Vessel File are similar and
the following sections describe the information held within the Vessel File. For
more information on MAKECVF please contact Global Maritime.
Vessel Name
The name of the vessel to which the data relates.
File Units
The units option for the data in the VESSEL FILE either METRIC (1) or IMPERIAL/USA (2). The data in the le will be converted automatically to the units
nominated in the SPREAD FILE (*.SPD) and can be changed at run time be the
user within Gmoor32.
Number Of Mooring Winches
The number of mooring legs (fairleads/winches) tted to the vessel. Up to 20
legs/winches are permitted in the standard version of the program and normal
practice is to number clockwise from forward starboard although any suitable designation may be used.
Fairlead Co-ordinates
The positions of the vessel fairleads are specied in the vessel co-ordinate axis
system. X is taken as POSITIVE STARBOARD, Y is taken as POSITIVE FORWARD and Z is POSITIVE UPWARD FROM THE KEEL.
The vessel origin is taken as the position of the vessel CG projected onto the
horizontal plane of the keel i.e. for most vessels it can be assumed to be on the
centreline amidships at the keel.
Vessel Draft
The vessel properties must be entered for three dierent vessel drafts. Typically,
data would be available for the survival draft (the lowest value), the operating
draft (the highest value) and an intermediate value. Gmoor32 interpolates linearly
between these three drafts for intermediate drafts.
Displacement
The vessel displacement corresponding to the appropriate vessel draft.
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Transverse and Longitudinal GM
The metacentric height, GM, of a vessel is a measure of its initial oating stability.
These values govern the dynamic behaviour of the vessel in roll and pitch. In the
present version of the program these values are not used.
Masses In Sway, Surge and Heave
The masses to be entered include added mass eects in the appropriate direction.
They must either be in tonnes or kips depending upon the units option selected.
SWAY is motion along the VESSEL X AXIS, SURGE is along the VESSEL Y AXIS
and HEAVE is along the VESSEL Z AXIS as shown in Figures 2 and 3.
Pitch, Roll And Yaw Radii Of Gyration
The radius of gyration of the vessel about each axis. PITCH is rotation about the
VESSEL X AXIS, ROLL is rotation about the VESSEL Y AXIS and YAW is about
the VESSEL Z AXIS as shown in Figure 3. These radii are to be based on the
vessel displacement such that the total inertia including added inertia eects is
the product of the displacement and the square of the relevant radius of gyration.
Sway, Surge And Heave Damping Coecients
The damping coecients of the vessel in the three principal directions. The damping in these modes is assumed to be linear - i.e. proportional to velocity. The surge
and sway coecients are closely related to the current loads. Damping coecient
dimensions are thus force per unit velocity. In the METRIC system the units
are TONNES/(METRE/SECOND). In the IMPERIAL/USA system the units are
KIPS/(FEET/SECOND). Heave damping is irrelevant in the present version.
It is possible to add further surge and sway damping at run time to account for
the eects of damping source such as wave drift, mooring lines, etc.
Pitch, Roll And Yaw Damping Coecients
The damping coecients of the vessel about the three principal axes. Pitch and
Roll damping are not relevant in the present version.
Yaw damping units are moment per unit angular velocity. In the METRIC system
they are TONNES METRES/(RADIANS/SECOND)2. In the IMPERIAL/USA
system they are KIPS FEET/(RADIANS/SECOND)2.
Alternative Quadratic Damping
The Gmoor32 input le for custom vessel data (*.CVF) may now contain coecients given for angular motion damping that are linear or quadratic. To provide
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exibility in the denition of damping coecients for use in time domain computations, damping force terms are evaluated as follows:F d = C1 u + C2 u 2 (where u is the vessel velocity)
Both linear and quadratic damping coecients, C1 and C2 , may be dened for
Sway, Surge and Yaw freedoms by using an alternative format for time domain
data in the CVF le.
Vessel Plan
The vessel plan is dened as a series of POLYGONS or BLOCKS. The vertices of
each block are specied relative to the vessel origin using x-y co-ordinates. The
co-ordinate convention has been dened so that a head-up display has x horizontal
and y vertical - i.e. x is measured positive to starboard and y is forward.
The plan information is only used in the graphic display and may be as simple or
detailed as required. If the VESSEL PLAN OPTION is not entered then Gmoor32
will not read this section of the data le but will represent the vessel plan as a
polygon joining the fairlead co-ordinates.
In our example the vessel plan is described in a separate PLAN le, G32 EXAM.PLN,
called by the CVF. The following sections of Number Of Blocks, Number Of
Blocks To Draw For Time Domain, Identier, Number Of Vertices and Vertex
Co-ordinates describe the PLAN le used as well as describe the Vessel Plan
within the VSL le.
Number Of Blocks
It is not necessary to produce a drawing to a great level of detail for a mooring
analysis. It is, however, often useful to be able to see where particular items on
the vessel are located relative to nearby structures and also to give visual cues
to vessel orientation. In particular heavy lift and accommodation vessels have
to approach xed structures closely and so the location and reach of cranes or
gangways is important. In this context the plan is not restricted to physical bodies
on the vessel but can also include crane or gangway radii.
First you must imagine the vessel plan to comprise a number of simple polygons.
One method is to photocopy a plan and with a coloured pen mark out the features
to be drawn using a series of straight lines to form polygons giving a simplied
outline such as that shown in Figure 3. In this case the features drawn are the
pontoons, the deck, the main accommodation module, the helideck and a cross
to show the centre of the vessel. In the example, G32 EXAM.PLN, the plan
comprises of 5 BLOCKS; Vessel Centre Mark, Derrick, Pontoons, Main Deck,
Helideck.
The maximum number of blocks allowed in the vessel plan is 20.
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Number Of Blocks To Draw For Time Domain
As required by mooring codes Gmoor32 can calculate the trajectory of the vessel
following sudden failure of a mooring line. During the time domain solution the
program draws the whole vessel plan at nominated time steps. So that these plots
do not become too cluttered by unnecessary detail a lesser number of blocks are
plotted at each solution time step. These are selected in the order they appear in
the plan le.
In this case we decide to plot only the rst BLOCK and thus enter 1 in this box.
Gmoor32 will plot only the rst block and therefore you must specify the required
BLOCK rst - in this case the cross at the centre of the vessel.
Each block must now be dened giving details required as follows:
Identier
For each BLOCK an IDENTIFIER is required - this is only for your convenience in
entering and checking data les and is not used by the program in any other way.
It must however be entered.
Number Of Vertices
The NUMBER OF VERTICES (points) which dene the rst BLOCK must be
entered here. In this case 12 points are needed to dene the cross. Note that the
total number of vertices in all blocks dening the vessel must not exceed 200.
Vertex Co-ordinates
The X, Y co-ordinates of each of the vertices must be entered in order. A straight
line will be drawn between successive co-ordinates and nally from the last to
the rst. It does not matter whether you specify the points going clockwise or
anti-clockwise round the BLOCK.
The denition of the rst block is now complete and the next BLOCK must be
dened, repeating the process until all the BLOCKS (8 in this case) have been
dened.
Thrusters
Thrusters can be included in the Vessel File and CVF. If thrusters are present then
the rst data item to be entered is the keyword *THRUST. This tells Gmoor32
that there is further information to be read from the data le.
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Number Of Thrusters
The number of thrusters/propulsion units installed on the vessel. The maximum
number allowed is 8 and there must be at least 1. You can include limited or
non-azimuth units (e.g. main propulsion). The details dened below must then
be entered for each of the thrusters.
Thruster Identier
A name or phrase of up to 10 characters to identify each unit.
Thruster Co-ordinates
The co-ordinates of the centre of action of thrust. This will normally be the
point at the intersection of the centre of the propeller boss and the vertical axis
of azimuth rotation. The co-ordinate system is as dened above for the fairlead
positions.
Maximum Forward And Reverse Thrust
The maximum values of forward and reverse thrust that each unit can develop.
Minimum And Maximum Azimuth
The range of azimuth angles to which the thrusters can be adjusted relative to
the vessel head. These angles must be in degrees. When Gmoor32 is running it
will not permit adjustment outside the range:
Minimum < AZIMUT H < Maximum
A reduced range of azimuth angles (including zero, which would not even permit
the limited eects of the rudders to be modelled), can be used to specify xed
main propulsion and rudders. Such a description is of limited accuracy for other
than small angles.
** WARNING ** Mooring guidelines normally limit the assumed eectiveness of
xed main propellers to counteract environmental loads other than from directly
ahead.
15.5 Example PLAN (*.PLN) File
The following is the PLAN le used by the Jack Bates spread. The PLAN le is
called by the CUSTOM VESSEL FILE, and contains the vessel plan information.
CVF normally contain the plan information as described above.
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VESSEL PLAN GMoor2 Test Case 1 /* Title - Must be non-blank
2 /* Units */
5 /* Number Of Blocks */
1 /* No. Of Blocks Time Domain */
VESSEL CENTRE MARKER /* Identifier Block 1 */
12 /* Number of Vertices */
0.3, 3.0 /* Vertex Co-ordinates - 1 */
0.3, 0.3 /* Vertex Co-ordinates - 2 */
3.0, 0.3 /* Vertex Co-ordinates - 3 */
3.0,-0.3 /* etc */
0.3,-0.3
0.3,-3.0
-0.3,-3.0
-0.3,-0.3
-3.0,-0.3
-3.0, 0.3
-0.3, 0.3
-0.3, 3.0
DERRICK /* Identifier Block 2 */
8 /* Number of Vertices */
20.0, -7.0
.
PONTOONS /* Identifier Block 3 */
28
45.0, 150.0
.
MAIN DECK /* Identifier Block 4 */
32
13.72, 45.72
.
HELIDECK /* Identifier Block 5 */
8
45.0, 150.0
.
*/
15.6 The FIELD (*.FLD) File
The purpose of the FIELD FILE is to enable Gmoor32 to draw the moored vessel in
the context of an operating area in which there may be other vessels, oil platforms,
pipelines, wellheads, wrecks or other obstacles placing constraints on the spread
layout or the vessel position. It is a particularly useful feature for examining the
trajectory of a vessel after a line failure if near to a xed platform.
In many cases the mooring location may have no features of sucient interest to
merit plotting them. In that case the user can specify *NONE in place of a eld
le name.
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In Gmoor32 (*.FLD) format the eld geometry is dened in terms of a number
of BODIES each of which comprises a number of BLOCKS or POLYGONS. Each
BODY is regarded as a separate entity and may be input directly into the eld
le or read from a separate BODY FILE. Each BODY can be dened in its own
co-ordinate system and in either system of units. The BODY is moved into the
required position as a whole and its units converted to the units nominated in the
SPREAD le.
Field Name
Text up to 40 characters should be entered to record relevant details of the eld.
In our example we have used the following title:Field Layout Example
Number Of Bodies
Enter the number of separate bodies by which you have chosen to describe the eld
layout. If you wish you could use just one BODY but for ease of checking complex
layouts we suggest you split the eld into well dened parts such as pipelines,
platforms, wellheads, wrecks etc. and treat each individual one as a single BODY.
Our example has used 3 BODIES to describe the eld.
Window Details Units
Gmoor32 draws two alternative views of the eld plan, which can be thought of
as WINDOWS which you will normally set to convenient sizes. The rst window
is intended to show the overall layout and anchor positions, and the second (at
greater magnication) to show local features. You can switch between these two
views when running the program. There are no overall units for the eld le the units for each body are declared when input. Thus before setting the view
limits you must specify the units in which you will specify the WINDOWS. In our
example the units have been set to 1, Metric Units.
Field Viewing Limits
As mentioned above the widest view of the eld is specied rst. It is dened by
the SIZE of the VIEW WINDOW and the CO-ORDINATES OF THE CENTRE
of the view.
In our example the windows have been set to 2000.0 metres and 300.0 metres
centre over the xed platform. The details entered in the le are as follows:
2000.0, 0.00, 0.00
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300.0, 0.00, 0.00
Body Name
Enter text up to 20 characters to identify the BODY - in this example we have
chosen a point and have entered:ORIGIN
Body Shift Co-ordinates
The body is in metres and the rotation as a BEARING relative to true North. The
values entered are 0, 0, 0.0 for the wellhead location.
Units For Body
As specied earlier there are two options for units;1 = METRIC
2 = IMPERIAL/USA.
In this case we happen to have eld drawings in metres so we enter 1.
Number Of Blocks
In this example we are going to draw the point of the wellhead. We thus need 1
POLYGON or BLOCK - dened as a square. So 1 is entered here.
Each of the BLOCKS in a eld should be specied on a separate data form and
whilst this may seem wasteful of paper with so few entries if you make a mistake
a methodically completed set of forms will make it much easier to trace.
Block Name
Enter up to 20 characters describing the BLOCK - in this case we enter:SPOT
Colour
The colour in which each block will be drawn is specied by integer values according
to the key given below. If a value outside the range 1 to 15 is given, then the
default colour 8 will be used.
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Code
0
1
2
3
4
5
6
7
Colour
Code
8
Lo Red
9
Lo Green
10
Lo Yellow
11
Lo Blue
12
Lo Magenta 13
Lo Cyan
14
Lo White
15
Colour
Hi Black (Grey)
Hi Red
Hi Green
Hi Yellow
Hi Blue
Hi Magenta
Hi Cyan
Hi White
Table 15.5: Colour Codes
Drawing Mode
Depending on the graphics devices available we can choose the way in which the
block is drawn and shaded/coloured. The DRAWING MODE can be set to 1,2,3
or 4 with the following eects on IBM PC versions:DRAWING MODE
1
2
3
4
EFFECT
Replaces
Overprint
Complement (XOR)
Erase
Table 15.6: Drawing Modes
The overprint mode (2) is recommended.
Shade Style And Pattern
Each BLOCK will be shaded as dened by these two integers.
SHADE STYLE
0
1
2
3
EFFECT
No shading (HOLLOW)
Solid (BLACK) shading
Dot pattern shading
Hatched Shading
PATTERNS
1
1
1-6
1-6
Table 15.7: Shade Styles
Note that SHADE PATTERN has no eect if SHADE STYLE is 0 or 1. In this
case we want no shading and so enter the values 0,0.
Number Of Vertices
Enter the number of vertices of the block being dened. The total number of
vertices for all BODIES/BLOCKS in the FIELD le must not exceed 2000. If
desired these could all be in a single block. In this case we enter 4.
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Co-ordinates
Enter the X, Y co-ordinates of each vertex. Since you can rotate and translate the
whole body into position you can use any orientation or origin of axes you wish.
Enter a new line for each vertex as shown in the example.
As an alternative you may specify a body in a separate le - BODY FILE. This
has the great advantage that having once dened a shape such as a Jack-up or
another vessel (e.g. Jacket) you can use it many times in dierent situations. The
format of a BODY le is exactly the same as the format for a single BODY.
To specify a BODY dened by a BODY FILE you must enter *FILE and then
the name of the le - this le must be available in the Spread File directory when
Gmoor32 is run and must have the extension .BOD.
15.7 Example FIELD (*.FLD) File
Field Layout Example
/* Test Case 1
*
* This file used for Gmoor32 QA Purposes *
* File created 9th Nov 1998 by NSW
*/
3
1
2000, 0.0, 0.0
300, 0.0, 0.0
*FILE jacket /* This calls up the Body File jacket.bod */
0.0, 0.0, -17.0
Origin
0.0,0.0,0.0
1
1
Spot
0.0,2,0,4
4
1,1
1,-1
-1,-1
-1,1
Pipelines
0.0, 0.0, 0.0
1
4
Amoco pipeline
1,1,1,0
4
1500, -715
1500, -725
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-1500, -725
-1500, -715
exclusion zone #2
0.0,2,3,2
4
1500, -520
1500, -920
-1500, -920
-1500, -520
pipeline from 52/5A to FTP
1,1,1,0
6
-20,20
-300,170
-1250,810
-1245,815
-295,175
-15,25
Exclusion zone
0.0,2,3,1
11
-70,-175
-400,0
-1350,640
-1130,975
-170,330
100,180
165,100
180,0
160,-85
95,-155
30,-180
15.8 Example Body File (jacket.bod)
Example Jacket
1
2
Platform
1,2,0,3
4
11.00, 20.0
11.00,-25.0
-11.0,-25.0
-11.0, 20.0
Helideck
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1,2,2,6
8
0.00, -5.50
10.00, -5.50
17.00, -12.00
17.00, -22.00
10.00, -27.50
0.00, -27.50
-7.00, -22.00
-7.00, -12.00
15.9 The RISER (*.RSR) File
The purpose of the RISER FILE is to enable Gmoor32 to include the riser's structural and dynamic characteristics in the analysis. All drilling operations are controlled by the behaviour of the drilling riser, and if the limits of the critical components within the riser are compromised operations have to be suspended.
RISER FILES are produced by Global Maritime's in-house riser analysis software
RISERDYN, and they dene the physical make up of the riser. To include riser
information in Gmoor32 RISERDYN has to be purchased from Global Maritime.
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Appendix A
GMOOR Technical Notes
A.1 GMOOR32 - Notes on Computational Background and Models
These notes outline the computational (theory) basis of how GMOOR32 performs
mooring analysis. Essentially the program computes the following and combines
the analyses according to API RP2SK, POSMOOR and similar mooring codes:
Equilibrium position of the vessel under the action of mean loads
Low frequency (slowly varying) response to wave drift and wind gust forces
Dynamic line tensions due to rst order motions either using static or dynamic line tensions
In addition to these notes (sheets A1 through A17) there are notes attached
on Wave Spectra in sheets C1 through C2.
A.2 Equilibrium of the Moored Vessel
The basic analysis method in GMOOR32 is to satisfy static and dynamic (instantaneous in the time domain) equilibrium of the vessel under the action of applied
environmental loads, mooring line restraints and, if appropriate the compensatory
use of the vessel's motive power (thrusters or propellers). The vessel is assumed
free to translate laterally in surge (fore and aft), sway (port to starboard) and
yaw (change in heading). For the purposes of equilibrium dynamic response it is
assumed that the vessel remains level and at constant draft - although the program can calculate the wave induced rst order pitch, roll and heave motions when
provided with the appropriate RAOs.
The mooring restoring forces are computed for each mooring leg using essentially
the static catenary equations assuming that:
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APPENDIX A. GMOOR TECHNICAL NOTES
1. The line lies in the vertical plane dened by the anchor and the fairlead
2. The line is xed at the fairlead and at the anchor
3. Friction may act upon the grounded portion of the line (note that all components between two buoys or the fairlead and a buoy are assumed ungrounded)
4. All line components, sinkers and buoys are in static equilibrium.
Each line, i, thus exerts a horizontal force on the vessel which acts in the direction
dened by the plan angle i between the fairlead and the anchor (note that these
angles change with vessel position). The force from each leg can thus be resolved
into x and y components (Hxi ; Hyi ) from which the three restoring forces (surge,
x, sway, y, and yaw moment) can be deduced. Summing these for all mooring legs
gives the total mooring restoring force vector. This force vector is a function of
vessel position and yaw rotation (heading change).


F mx
Fmooring (x; y; ) =  F my 
F m
The environmental forces acting on the vessel are due to wind, waves and current (see details later). In general these are a function of the environment (e.g.
windspeed and direction plus current and waves) and the vessel heading. If the
vessel is moving then its velocities in surge sway and yaw (u,v,w) will modify the
environmental loads.


F ex
Fenv (env; u; v; w; ) =  F ey 
F e
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APPENDIX A. GMOOR TECHNICAL NOTES
The vessel may also use main propellers or thrusters to assist stationkeeping (note
that these are only permitted to oset the mean load and thus apply steady forces
and moments in the present version of GMOOR32 - 9.4):
F tx
Fthrust =  F ty 
F t


With the exception of thrust, the force vectors are generally a function of time.
The equation of motion for the vessel is thus:
Mx 0 0
xv
2
 0 My 0  d yv  = Fmooring (x; y; ) + Fenv (env; u; v; w; ) + Fthrust
2
0 0 Iz dt v


 
Note that GMOOR32 simplies the mass matrix to be diagonal and frequency
invariant. Each term includes the added mass of 'entrained' water as dened by
the user in the VSL or CVF les.
This equation is used for static and low-frequency equilibrium calculations. In
the static case the accelerations (LHS) are zero and it is simply a question of
nding the vessel position (vector) which results in zero overall forces - where the
environmental forces are exactly counterbalanced by the restoring forces from the
moorings and the thruster forces. The low frequency calculations are discussed
after presentation of the basis for computing environmental loads.
A.3 Environmental Loads
Where a suitable Custom Vessel File has been prepared GMOOR 32 can compute
the environmental forces on the vessel for specic user-dened wind speed and
direction, current speed and direction and wave height, period and direction. Alternatively GMOOR32 can be used in a very simple way where the environmental
forces and vessel motions are separately computed and input in this format.
The environmental loads on the vessel arise from the action of wind, current and
waves. The action of wind and current is assumed to be dened by standard
aero/hydrodynamic drag/lift forces using equations of the form :
F = C U2
The force F is proportional to the square of uid speed U and C is the force
coecient. This equation applies whether the vessel is stationary or moving. In
the latter case however the uid velocity is relative to the vessel and in this way
damping appears in the equations of motion as part of the environmental load
variation, particularly from the current.
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APPENDIX A. GMOOR TECHNICAL NOTES
A.3.1 Wind Forces
The wind forces are given by :F xwind
Cxwind
 F ywind  = Cywind  U 2
Mzwind
Czwind




Conventionally the wind speed upon which the coecients are based is at the meteorological standard reference height of 10m (above SWL). The coecients are
typically determined experimentally (wind tunnel tests) or from simplied calculations where the aerodynamic 'shape' of the vessel is represented by a wind model
comprising a collection of basic prismatic elements (see for example the MODU
code or the HYDWind manual). These calculations are based upon a particular
wind speed variation with height, usually a power law.
Note that these coecients are dependent upon both the reference height chosen and the wind speed prole. Commonly the forces are calculated using the
ABS/MODU method where the height coecients represent the \square of velocity" prole. This prole is equivalent to a velocity power law exponent of approximately 0.085 and was originally dened in the context of stability - it strictly
applies to short-term average wind speeds such as the sustained speed (1 minute
average). API RP2SK uses an exponent of 0.1 and cites this as relevant to the
1 minute mean wind speed. API RP2A, in the context of the hourly mean wind
speed, suggests an exponent of 0.125 - this exponent gives a similar prole to that
proposed by NPD for the hourly mean wind speed.
The unsteady wind loads may be computed by setting the velocity U to be the
mean (e.g. hourly) speed at 10m plus an unsteady component u representing the
turbulence. Assuming the same coecients the unsteady forces are thus:
F = C (U + u )2 = C U 2 + 2 Uu + u 2
There are two choices for including the eects of the unsteady component u
(gust) - in the time domain a wind velocity history may be synthesised from the
wind spectrum, or in the frequency domain a wind force spectrum can be derived
from the above. Since the unsteady component u is typically around 10% of the
mean U the term u 2 . This leaves a mean force C U 2 and uctuating component
2C U u . It may easily be shown that the spectrum (power spectral density) of
wind force SF (f ) is related to the wind velocity spectrum Swind (f :U10 ) by:
SF wind (f ) = (2 Cwind U10 )2 Swind (f ; U10 )
For calculations of slow drift response in the time domain the excitation is calculated directly using the relative velocity. A time-history of wind speed is generated/synthesised from the wind spectrum. The eects of the vessel low-frequency
motions are included by replacing U10 and the current speed by their velocities relative to the vessel (i.e. including the vessel's motions).
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APPENDIX A. GMOOR TECHNICAL NOTES
A.3.2 Current Forces
The current forces are given by :
 

F xcurr
Cxcurr
 F ycurr  = Cycurr  Uc 2
Mzcurr
Czcurr
The current speed upon which the coecients are assumed based is the average
current close to the surface, typical at a depth 5 to 10m. Currents are assumed
steady i.e. are not turbulent.
A.3.3 Wave Forces
First order vessel motions (proportional to wave amplitude) are unaected by the
moorings for all typical oshore vessels. There are second order forces which are
proportional to the square of wave amplitude associated with reection/diraction/radiation.
The forces are conveniently expressed in the form of a wave reection force coefcient :
F (f ; )
Cwave (f ; wave ) = wave a2 wave
where


Cxwave
Cwave = Cywave 
Czwave
and a is the (regular) wave amplitude.
These coecients are dened in the custom vessel le (CVF)
In an irregular sea state (spectrum) there is a mean force given by :
Fwave = 2 Z
2
Z 1
0
2
Cwave (f ; ) S (f ; ) df d
Where S (f ; ) is the directional wave spectral density m2 /Hz/rad (see wave spectra)
The treatment of slowly varying wave force depends upon whether the analysis
is in frequency or time domains. In the frequency domain the wave drift force
spectrum is :
Z Z 1
Cwave (f + 2 ; )2 S (f ; ) S (f + ; )df d
SF wave () = 8 0
2
2
The total low frequency force spectrum is thus
SF () = SF wave () + SF wind ()
Note that these spectra are `vectors' - there is a separate contribution in each
degree of freedom - surge, sway and yaw.
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APPENDIX A. GMOOR TECHNICAL NOTES
A.4 Estimation of Slow Drift Response
A.4.1 Frequency Domain
The response equation may be written in the standard linear form
d2
d
M dt 2 X + C dt X + K X = F (t )
For a particular angular frequency ! = 2f the equation can then be recast :
(K M !2 + iC ) X = A(!)
So the response is
X = (K M !2 + iC ) 1 A(!)
Where,
M is the mass matrix and is diagonal
K is the stiness matrix and is the tangent stiness at the appropriate mean oset
note that it is not diagonal in general - there are 'cross' terms coupling surge
sway and yaw.
C is the damping matrix and is also diagonal - initially it is set to the linear values
input in the custom vessel CVF le.
A is the excitation force amplitude vector for the particular frequency !
The term (K M !2 + iC ) 1 is the complex transfer function H(!) - a matrix.
Note that both C and M are assumed the same for all frequencies.
The low frequency response is resonant - the dominant responses occur at the
natural periods in surge sway and yaw which are obtained from the eigenvalues of
the above (undamped) equation. Thus response amplitudes are very dependent
on the precise values of damping used. The dominant damping mechanism is the
variation in current (i.e. hull underwater drag) forces. By default GMOOR32
will iteratively determine suitable values for the diagonal terms in C as follows.
In the rst instance, Gmoor calculates the motion variances using the damping
coecients in the CVF. Then for each mode in turn, Gmoor uses the current force
coecients to calculate the energy dissipation for the vessel executing harmonic
motion at the respective natural frequency, with an amplitude of 3.5 times the
standard deviation, in whatever current has been set by the user. From this it
derives equivalent linear damping coecients to give the same energy dissipation,
substitutes these in the damping matrix and recomputes the motion variances.
The program iterates until the motion variances converge.
If the user species additional damping this is added as a linear component. If
the total damping is set then current damping is excluded and the computations
are entirely linear (no iteration eectively). Clearly there are a number of approximations and assumptions in this simplied procedure, in particular that there is
no cross-coupling via damping and that the responses at the natural frequencies
determine the coecients.
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APPENDIX A. GMOOR TECHNICAL NOTES
A.4.2 Time Domain
A more rigorous procedure than that above is to compute the low frequency response in the time domain in essentially the same way as the transient responses
to line failure using a fourth order Runge Kutta numerical integration scheme.
For the underwater and above-water portions of the vessel, the velocity dependent
hydrodynamic and aerodynamic forces are calculated from the respective force
coecients coupled with the appropriate relative velocities. The contributions
to the water relative velocity are the current velocity (assumed steady) and the
vessel velocity. The contributions to the air relative velocity are the wind velocity
(which is unsteady as previously discussed) and the vessel velocity. The fact that
the vessel velocity is included in both the water and air relative velocities means
that both the hydrodynamic and aerodynamic damping mechanisms are properly
modelled. Wave drift forces vary with vessel velocity and thereby introduce wave
drift damping terms. GMOOR can compute an approximation to these (Faltinsen
p141) and apply these extra damping forces if required. If line dynamics properties
have been dened then GMOOR can also compute an estimate of the damping
due to mooring lines - this should only be applied (it is user selectable) if the
tensions are using dynamic analysis.
The wind forces are thus calculated from the formulae given above using the vessel
velocity and the unsteady (gusty) wind speed. This is generated according to the
user selected wind spectral formulation and synthesised as the random combination
of approximately 30 components uniformly spaced to cover the frequency range
0.01 radians/s to 0.3rad/s in 0.01 rad/s bands.
The wave drift force is calculated using Newman's method (Reference 1) using a
time history of wave elevation synthesised from the input seastate (and spectral
shape/spreading though not expressed in the formulation shown below). The wave
elevation is :
(t ) = Re
X
m
Am
e i!m t
!
and the slowly varying force is given by :
Fslow (t ) = Re
X
m
Am 2Cwave (!m
p
) e i!m t
!2
Re
X
m
Am p
2Cwave (!m
) e i!m t
!2
These summations are to be carried out only for those terms where the argument of
the square root is positive in each case. The force calculated according the above
equation contains extraneous HF noise which has no physical basis. Although the
time history of wave drift force could be cleaned up by passing through a low pass
lter this is not necessary since we are only interested in the low frequency vessel
motions - the mass of the vessel acts as a low pass lter, the HF noise does not
excite any perceptible motion.
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APPENDIX A. GMOOR TECHNICAL NOTES
A.5 Static Catenary Theory
Considering a length ds of cable, for horizontal equilibrium the horizontal force
H = T cos() has to be constant:
T (s ) cos((s )) = constant
d
d
hence d
T () cos() ! d T () cos() T () sin()
d
d T () cos() T () sin() = 0
d
so d T () = T () tan()
= (s )
For vertical equilibrium the change in vertical load must equal the line weight:
d
d
d
w = ds T (s ) sin() = d T () sin() ds d
d
T
(
)
sin(
)
!
d
d T () sin() + T () cos()
T ( )
T () tan() sin() + T () cos() simplify ! cos()
T ( ) d
so cos() ds = w
H
So since T () = cos(
)
H
d
cos()2 ds = w
But if the line is elastic, and assuming that as it stretches it preserves the total
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APPENDIX A. GMOOR TECHNICAL NOTES
weight in water, then, assuming the strain is linear,
w0 w0
w=
=
T
H
1 + EA
1 + EAcos(
)
H
d
w
0
H
cos()2 ds = 1 + EAcos(
)
H
w0
H
d
cos()2 1 + EA cos() ds = 1
H
d
c sec()2 1 + EA sec() ds = 1
Z
H
2
3
s = c sec() + EA sec() d
H
1
H
sin() 1
s =c cos() + 2 c EA cos()2 sin() + 2 c EA ln(sec() + tan())
1
H
1 H
s =c tan() 1 + 2 EA sec() + 2 EA c ln(sec() + tan())
1 H
1 H
s = c tan() + 2 EA c tan() sec() + 2 EA c ln(sec() + tan())
"
#
The rst term is the standard inelastic caternary forumla, the terms in H=EA are
those due to elastic (linear) stretching. Thus we have determined the variation of
with s (spanwise) along the line and can similarly derive the variations in lateral
and vertical position, x () and y ().
d
Now ds
x = cos() so dx = cos()ds
x=
Z
H
c sec()2 + EA sec()3 cos()d
sin() H
x = c ln(sec() + tan()) + c cos() EA
H
x = c ln(sec() + tan()) + c tan() EA
d
Similarly ds
y = sin() so dy = sin()ds
H
and thus y = c sec() + EA
sec()3 sin()d
1
1
H
y = cos() + 2 EA cos()2 c
1
H
y = c sec() 1 + 2 EA sec()
Z
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APPENDIX A. GMOOR TECHNICAL NOTES
These equations may readily be extended to nonlinear elastic cable where the
strain-tension relationship can be expressed in the form of of a polynomial in
tension.
The equations above are all missing their constants of integration - these are
actually the s , x or y values for another known point - e.g. the low point of the
catenary. Thus the dierence in elevation between two points 1 and 2 within a
component is given by:
H
y = c sec(2 ) 1 + 21 EA
sec(2 )
1 H
c sec(1 ) 1 + 2 EA sec(1 )
GMOOR32 applies these equations to each component in a multicomponent line,
satisfying equibrium of intermediate buoys or sinkers and ensuring the line is, when
grounded, tangential to the local seabed. For a sinker when the vertical load from
adjacent components exceeds its weight it rises above the seabed otherwise rests
on the seabed. A buoy oats at such a draft as to support the loads from adjacent
components at the connection of its pennant.
A.6 Catenary Dynamics
GMOOR32 uses a lumped mass model of the mooring line to compute line dynamics. The mooring line is divided into an appreciable number of segments each adjacent half segment is represented by a discrete 'lumped' mass which are
interconnected by linear springs representing the elasticity of the segment. The
mass, added mass and uid drag of each half segment is assumed applied to the
lumped mass. The sketch below shows how this is done for a 3 component line.
The user species how many segments each component should be represented by
- typically 20-30 is more than adequate for each component. Sensible results can
usually be obtained with 10 or less. Short sections obviously do not need many
segments.
The dynamic analysis used within GMOOR32 was originally developed in a standalone program TRANSDYN - a validation report comparing the results with other
published data is attached to these notes. This same code is called within GMOOR32.
Basically the dynamic response is calculated for a specic mean line tension. It
is assumed that the line hangs in a static catenary at this mean tension. This
conguration is determined by iterative solution for free-hanging equilibrium of
the lumped masses. The stiness matrix is computed for this static conguration.
The line dynamic calculation is a frequency domain solution of the response of
the masses to motion of the fairlead. Although the code can handle any form of
elliptic motion of the fairlead, extensive calculations have shown that the motion
tangential to the line at the fairlead is the critical parameter. Thus GMOOR32
computes the RAOs of fairlead motion in the plane of the mooring line and in the
direction of the tangent to the line at the fairlead at the required mean tension.
From these the signicant and maximum motions can be computed, as can the appropriate value of period of oscillation - essentially the mean period of the fairlead
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APPENDIX A. GMOOR TECHNICAL NOTES
motion. The iterative solution is necessary because the uid drag on the line is
proportional to the square of oscillation velocity. The drag on each mass is actually
computed during solution as proportional to velocity (linearly) but the coecient
is chosen such that the same energy is dissipated per cycle as if it were quadratic.
Solutions are repeatedly found until the changes in estimated amplitudes iteration
to iteration are acceptably small.
A.7 Slowly varying Wind Forces and Wind Spectra
used in GMOOR32
A.7.1 Terminology
Uz 1 hour mean wind speed at z m above swl
Cd surface drag coecient based upon U10
Cwind Vessel wind load coecient based upon U10
u friction velocity (Cd U10 )
p
f frequency in Hz
S Spectral Density in
m=s )2
Hz
(
A.7.2 Wind force spectral density
SF (f ) = (2 CW IND U10 )2 Swind (f )
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APPENDIX A. GMOOR TECHNICAL NOTES
The wind velocity spectral densities may be chosen from the spectra given by
Harris (see Ochi (1), API RP2A (2), Ochi and Shin (1) or NPD (3))
The use of Cwind (instead of a revised coecient based upon the prole of turbulence and accounting for coherence) is conservative and overestimates low frequency wind forces.
A.7.3 Harris (Ref 1)
Cd
u
Lu
U
Z
SHarris (f ; U10 ; z ) := x
S
S
S
0:0008 + 0:000065 max(U10 ; 7:5)
p
Cd U10
180
Z
U10 + 2:5 u ln 10
1:09 L
f U u
Z
21:97 x
(1 + 6 2 x 2 )
S 2
f u
A.7.4 API RP2A / ISO 13819-2:1995E (Ref 2)
z 0:125
UAPI (U10 ; z ) := U10 10
zr
10
z
20
s
:125 if zs <= zs
:275 otherwise
z
z
U
0
:
15
10
zs
SAPI (f ; U10 ; z ) := f
UAPI (U10 ) zp
p
z 2
S
5
3
f
f
1
+
1
:
5
p
fp
S
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APPENDIX A. GMOOR TECHNICAL NOTES
A.7.5 Ochi and Shin (Ref 1)
Cd
0:00075 + 0:000067 U10
p
u
Cd U10
z Uz
U
+
2
:
5
u
ln
10
10
z
fU
f
z
x
1 + f 0:35 11:5
SOchi (f ; U10 ; z ) := 583 f
0:70
crS 420 f
x
838
f
x
S 2
S f u
S
Cd
UOchi (U10 ; z ) := u
U
0:00075 + 0:000067 U10
p
Cd U10
z U10 + 2:5 u ln 10
A.7.6 NPD (Ref 3) See NORSOK N-003
h
z i
Uz = U0 1 + C ln 10
1
C = 5:73 10 2 (1 + 0:15U0 ) 2
and where the turbulence intensity factor lu (z ) is given by
z 0:22
lu (z ) = 0:06[1 + 0:043 U0 ] 10
where U0 (ms 1 ) is the 1 hour mean wind speed at 10m.
For structures and structural components with signicant dynamic response under
wind uctuations a wind spectrum shall be used to describe the longutudianl wind
speed uctuations. For situations where the low frequency excitation is of importance, the following one sided spectrum is recomended (Andersen and Lvseth,
1992)
S (f ) = 320 where n=0.468
Page 147
U0 2 z 0:45
10
10
(1 + f~n ) n
5
3
z 2=3
f~ = 172 f 10
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APPENDIX A. GMOOR TECHNICAL NOTES
S(f ) (m s =Hz) is the spectral density at frequency f (Hz)
z (m) is the height above sea level
U (ms ) is the 1 hour mean wind speed at 10m above sea level.
2
0
2
1
t
1 + 0:137 ln 10z 0:047 ln 600
U10
UNPDT (U10 ; z; t ) :=
1 + 0:137 ln 10
0:047 ln 3600
10
600
h
z i
UNPD (U10 ; z ) := U10 1 + 5:73 10 2 (1 + 0:15 U10 ) ln 10
n
0:468
z U 0:75
fnd
172
f
1010
10
SNPD (f ; U10 ; z ) := U 2 z 0:45
10
S
320 10
n
(1
+
f
nd ) n
S
1
2
2
3
10
5
3
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GMOOR
A.8 Comparison of Spectra
f := 0:001; 0:002 : : : 1 U10 := 30 z := 10
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Appendix B
Wave Spectra
B.1 JONSWAP Spectrum
Goda's formulation of the a term in JONSWAP spectrum with variable peak enhancement factor (gamma) is as follows:
0:0624
(; Hs ; Tp ) := 0:230 + 0:0336 0:185 (1 + ) 1 Hs 2 Tp
4
Shell's form of the spectrum is as follows:
5 H2
(; Hs ; Tp ) := 16 s 4 1:15 + 0:168 Tp
0:925
1:909 + 1
:= 1; 1:2 : : : 7 Hs := 1 Tp := 10
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APPENDIX B. WAVE SPECTRA
4:0 10
5
3:5 10
5
3:0 10
5
2:5 10
5
2:0 10
5
1:5 10
5
1:0 10 5 1
(; H s ; Tp )
(; H s ; Tp )
2
3
4
5
6
7
The JONSWAP spectrum is (using the Shell formulation which is more accurate):
0:07 if f Tp < 1
0:09 otherwise
S (f ; ; Hs ; Tp ) := (; Hs ; Tp ) f 5 exp
5 (f T )
p
4
4
exp
"
(f Tp 1)2
2 2
#
The above can be expressed in normalised form where the frequency scales as
1=Tp and the energy as Hs 2 . Thus there is no loss in generality to use specic Hs
and Tp values.
So take the peak period as Tp := 8 and the upper limit for integration as fmax := 10.
The nth moment of the spectrum is dened as:
m(; Hs ; Tp ; n) :=
Z fmax
0
S (f ; ; Hs ; Tp ) f n df
The nth moment period is then dened:
m(; H ; T ; 0)
T (; Hs ; Tp ; n) := n m(; Hs ; Tp ; n)
s p
s
The ratio between Tp and the nth moment period is:
T
(; Hs ; Tp ; n) := T (; H p; T ; n)
s p
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APPENDIX B. WAVE SPECTRA
Specic values are given below for the rst and second moment periods - Tz is
normally taken as the second moment period.
Mean JONSWAP
Pierson Moskowitz
First
(3:3; 1; Tp ; 1) = 1:1986 (1; 1; Tp ; 1) = 1:2957
Second (3:3; 1; Tp ; 2) = 1:2862 (1; 1; Tp ; 2) = 1:4076
The most common forms of spectra used are the mean JONSWAP ( = 3:3)
and the Pierson Moskowitz ( = 1). The spectra are plotted below for the
frequency range f := 0; 0:002 : : : 25; Hs := 1 and a Tp of 10 seconds. The eect
of increasing is to push relatively more energy in at the peak and correspondingly
take it from both high and low frequency areas either side. Note that GMOOR32
uses either the mean JONSWAP or the Pierson-Moskowitz spectrum ( = 1).
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APPENDIX B. WAVE SPECTRA
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Appendix C
Software Protection System
C.1 Overview
GMOOR requires a valid license to operate, otherwise it will start up in evaluation
mode. In evaluation mode all the editing screens are active but the user cannot
run any analyses or perform top tension calculations. The installation program is
the same for all versions of the program. The license le activates the GMOOR
level and options that actually run. There may also be a limit on the program
version number that can be run and there may be an expiry date in the license.
There are 2 levels of the program
No License - Evaluation Mode, limited functionality
GMOOR32M - VSL les only
GMOOR32Q - CVF les and VSL les
GMOOR32D - Line Dynamics, CVF les and VSL les
The following additional features are available
T - Low Frequency Time Domain
G - Guidance
ACAD - Academic License
You can see the license type that you have by Selecting Help-Licensing in GMOOR
Help-Licensing is also the best place to look if you are having problems with the
licensing
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APPENDIX C. SOFTWARE PROTECTION SYSTEM
Figure C.1: Help-licensing dialog showing local license le
C.2 License Files
Each license is a plain text le with a .lic le extension. On a network server
the license(s) are installed on the license server computer. On a stand-alone
installation, the license(s) are placed in the GMOOR program folder.
The name of the license le is not important as long as it has the .lic extension. It
can be renamed if desired (not recommended). We usually adopt a fairly standard
naming convention for lic les. for example. . .
key_A29B_GMOORDT_v94xx_noexp.lic
. . . which would mean the license is for
Dongle A29B
GMOORD
LFTD enabled
versions up to but not including 9.500
no expiry date
If you open open a .lic le with notepad or some other text editor it will look
something like this :# GM License created 16:57 on 15/07/2004
SERIAL
= 9404
PRODUCT
= GMOOR
VENDOR
= Global Maritime
CUSTOMER
= Nigel Laptop
LEVEL
= 2
FLAGS
= LFTD
VERSION
= 9.499
LOAN
= 0 # days
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APPENDIX C. SOFTWARE PROTECTION SYSTEM
TIMEOUT
DEATH
EXPIRY
MACHINEMASK
MACHINEID
SIGNATURE
=
=
=
=
=
=
5 # minutes
0
0
1
70e986d9a227ffa0307b3fc702ae97c0
87f9c7bef3b7a0658434c82d4602bc82
You cannot change the details in the license yourself as it is digitally signed.
C.3 Conguration Overview
First you need to know if you should be using a network license or not. You should
have been informed of this when you obtained the program.
C.4 Stand-Alone License Installation and Conguration
In standalone licensing, the license can be tied to a dongle, a hard disk id or
an ethernet card id or any combination of those. Usually, stand-alone licenses
are tied to a dongle.You should have been informed what the license is tied to
when you obtained the program. If you are not sure, you can nd out by opening
the .lic le in notepad and looking at the MACHINEMASK line. The values of
MACHINEMASK are as follows :-
1 = disk id
2 = ethernet card
3 = disk id and ethernet card
4 = dongle
5 = dongle and disk id
6 = dongle and ethernet card
7 = dongle, disk id and ethernet card
If you are using a dongle, then you must have the Sentinel Dongle Drivers installed.
These are no longer installed by the GMOOR installation program, but come with
a separate install program. It will either have been supplied on the CD or can be
downloaded from the Global Maritime support web site.
The sentinel Dongle Driver Installation by default installs drivers for both the
parallel port and USB dongles. You may have been supplied with either of these.
Increasingly, we are issuing USB dongles because some PC's (notably laptops) do
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APPENDIX C. SOFTWARE PROTECTION SYSTEM
Figure C.2: USB and Parallel port dongles
not have parallel ports any more. There are pictures of the two types of dongle
below.
If you have a USB dongle, do not plug it in until the drivers have been installed.
Any license les that you have been supplied with need to be copied into the
RiserDyn program folder.
C.5 Typical Stand-alone licensing Problems
The Help-Licensing dialog can be used to diagnose any licensing problem. The
typical problem is that the license is not found for some reason and GMOOR starts
in evaluation mode (gure C.3).
Figure C.3: Evaluation mode warning
This is what happens if you install GMOOR and run it without doing anything else
i.e. without installing license les, dongle drivers or a network license server. If
you get this message and think you have installed everything correctly then open
the Help-licensing dialog (gure C.4).
There are 2 items of information that will tell you the problem:
Dongle Locking Code
License File
If the program is working correctly, you will get a dongle locking code and a
license le name displayed, as illustrated above. The dongle locking code is the
locking code for the dongle attached to the computer, with the MACHINEMASK
appended. The locking code should match the MACHINEID in the license le.
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Figure C.4: Help-licensing in standalone mode
The license le displayed is that GMOOR has found in the program folder and is
using. If no valid license could be found this box will be blank.
If in the dongle box it says \Could not locate dongle"
This refers to the PC that you are running GMOOR from.If you are using the
Network Server for licensing then this is not a problem, as the dongle (if any) will
be on the server computer.
If you know you should be using a dongle, then either
The dongle is not plugged in
The dongle drivers are not installed
If the License File box is empty
Most likely the .lic le is not in the GMOOR program folder. If there is a lic le
in the program folder, either :-
The lic le is for the wrong program - check the PRODUCT line in the lic
le
The lic le does not match the dongle. Usually we put the dongle serial
number in the lic le name. Check the serial number (S/N) on the dongle
The license has expired. usually we put the expiry date in the lic le name
or noexp if it never expires. You can't tell from the contents of the lic le
what the expiry date is but if DEATH > 0 then there is an expiry date.
The license does not allow running the version of the program that is in-
stalled. The latest version that the license will let you run is recorded in the
lic le in the VERSION line. for instance if the VERSION = 9.499 then you
can run any version up to 9.499 but not version 9.500.
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C.6 Network License Installation and Conguration
A network license is a shared GMOOR license that can be used by more than
one person but not simultaneously. A nominated computer on the network runs a
piece of software called the license server which has all the licenses installed into
it. The license server then keeps track of the number of concurrent users up to
the maximum number licensed.
If you are using a network license, then a license server needs to have been installed
and congured. If it hasn't and you are the person that needs to install it, then
consult the section ??
Once the server is installed and congured, then you can install GMOOR on any
computer on the same network and then start GMOOR and go to the HelpLicensing dialog, then select Network Server as the license type and pick the IP
address of the license server from the drop down list. There should be only 1 IP
address in the list, if there are more, consult whoever installed the license server
because they've probably installed it on 2 computers by mistake. If there is no IP
address in the list then it is likely that there is no license server installed on the
network.
Just because there is an IP address listed doesn't mean that server has a valid
GMOOR license available on it, it is just a list of computers with the server
software installed on them.
C.7 Network Licensing Tips
1. There is no dierence between a network license le and a stand alone license
le. This means that you can install any license in the license server, even a
dongle license. All you have to do is remember to instal the dongle drivers
on the license server computer.
2. Licenses on a license server must have unique serial numbers (the SERIAL=
line in the license le). We don't necessarily pay attention to serial numbers
for licenses issued for use with dongles and it's possible if you use more than
one of them on a license server, they won't work because the serial numbers
is not unique.
C.8 Network License Server Installation and Conguration
A network license is a shared license that can be used by more than one person but
not simultaneously. A nominated computer on the network runs a piece of software
called the license server which has all the licenses installed into it. The license
server then keeps track of the number of concurrent users up to the maximum
number licensed.
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There are two components of the license server installtion
License Server Service (licserve.exe)
License Server Manager Utility (licmanager.exe)
Both these components get installed onto the server by the License Server Installtion program.
Step 1 First Choose your server - the rst thing you need to do is choose a com-
puter to run the license server. This computer needs to be on the same
network as the computers that re going to run GMOOR. The server computer should be running Windows XP, 2000 or NT Workstation or Server.
It will need to be running whenever someone wants to run GMOOR, so it
needs to available all the time. Most people would install to license server
on a le server simply because it will be available all the time.
Step 2 download the installation program - the License Server Installation Program
Step 3 install the program - on the chosen server, run the downloaded setup
program and accept all the defaults. This will install the license server as a
service on the chosen computer and will start the service. The program by
default is installed in the C:nProgram FilesnGlobal Maritime License Server
folder.
Step 4 connect to the server with the license manager utility - the license manager utility is installed in the same folder as the license manager. However,
licmanager.exe can be copied and run from any convenient computer on the
network. The functionality of the license manager utility is the same whether
it is run locally or remotely. When you start the license manager utility you,
it initially starts dicsonnected from the server so rst need to connect to
the server. Select File-connect from the menu and you get a combo box
displaying the ip addresses of all the license servers that have been detected
on the network. Note that this is a combo box, so it is possible to type
the name or ip address of a computer on a distant network and, as long
as that ip address/name is routable from your computer, you can remotely
administer that license server.
Step 5 install the licenses - When you rst connect to the server from the license
manager, there are no licenses installed Each license is a plain text le with
a .lic le extension. If you have 5 licenses for GMOOR you will have 5 .lic
les. The makecvf license is separate from the GMOOR licenses so if you
have 5 GMOOR32D network licenses you will have 5 gmoor lic les and 5
makecvf lic les. To install the licenses you simply copy all the lic les to the
folder called licenses which is created as a subfolder of the folder where the
license server is installed. To load the licenses into the server, you should
run the license manager and select Tools-Reload Licenses from the menu.
If the licenses are valid, they should then be displayed in the main window
of the license manager utility License Manager With licenses loaded.
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Step 6 congure the clients - The client software (eg GMOOR) can now be
congured to use network licensing with the Network Server selected to be
the ip address of the license server. In GMOOR you do this from the license
dialog (Help-Licensing)
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Appendix D
Software License Agreement
Global Maritime Consultancy Limited
License Terms
Licensed Software : GMOOR
Important Notice. This is a copy of the licence agreement which is included when
the program is rst purchased. If you do not agree to these terms then do not
install it - return the package in its entirety within 21 days for a full refund.
By installing or retaining the software beyond this period the software you are
deemed to have accepted that all use of the software shall be subject to all the
conditions of this agreement.
This licence agreement is made between :
Global Maritime Consultancy Limited of Irwin House, 118 Southwark Street, London SE1 0SW including the companys legal personal representatives, successors
and assigns (the \Licensor") and you (the \Licensee").
WHEREAS Licensor or its parent company Global Maritime Holdings Ltd owns the
rights in certain computer programs and documentation and Licensor has thepower
to grant licenses to the Software, and
WHEREAS Licensee desires to use the Software for its own internal purposes.
NOW THEREFORE it is hereby agreed as follows
1 DEFINITIONS
1.1 `Licence' shall mean this document withits appendices.
1.2 `Programs' shall mean the computer program or programs.
1.3 `Security Devices' shall mean the device or devices which attach to
the computer on which the Programs are installed thereby enabling the
Programs to function.
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1.4 `Software' shall mean the Programs together with associated Security
Devices and shall include any replacements, modications or additions
supplied under this Licence.
1.5 `Documentation' shall mean the manual or manuals and other documents associated with the Software supplied by the Licensor to the
Licensee.
2 LICENCE
2.1 The Licensor hereby grants to the Licensee a non-exclusive, non-transferable
licence to use the Software on the terms and conditions contained
herein.
2.2 The term of this license shall be twenty years from the date of acceptance unless otherwise agreed.
3 DELIVERY
3.1 The Licensor shall deliver the Programs by registered mail or courier together with the associated Security Devices and Documentation. The
program code will be delivered on cd-rom.
4 ACCEPTANCE
4.1 Acceptance of the Software shall be deemed to take place on delivery
of the Software and Documentation in accordance with Clause 3.
5 TRAINING
5.1 The licensee undertakes that persons using the Software will make reasonable endeavours to familiarise themselves (i) with the use and application of the Software from the supplied documentation and (ii) with
the Licensee's relevant computer and its operating system sucient for
the proper operation of the Software;
5.2 The Licensor may provide training in the use of the software at additional cost if requested by the Licensee.
6 SUPPORT AND MAINTENANCE
6.1 Support and maintenance service as specied hereunder shall be provided from the date of acceptance for a period of 12 months unless
terminated in accordance with Clause 14.
6.2 Support following the 12 month period will be made available only if
Licensee enters into a separate maintenance agreement with Licensor
and pays in advance the periodic maintenance charges as published by
the licensor.
6.3 The Licensor shall provide during normal working hours a telephone and
correspondence answering service for the Licensee to report problems
with use of the Software.
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APPENDIX D. SOFTWARE LICENSE AGREEMENT
6.4 The Licensor undertakes to correct all errors that are detected in the
Software, conditional upon the Licensee having:- provided adequate
information in respect of any malfunction in the Software; incorporated
all amendments issued by the Licensor; and not otherwise changed the
Software.
6.5 In the event that the Licensor discovers that reported errors are the
result either of incorrect usage as determined by the Documentation
or of changes or modications to the Software made by the Licensee
then the Licensor reserves the right to recover the costs involved in the
investigation of the reported errors from the Licensee.
6.6 The Licensor shall provide and if appropriate install all updates and new
releases of the Program that rectify errors whether or not detected as
a result of report by the Licensee.
6.7 The Licensor shall replace any defective Security Device conditional
upon the defective Security Device being returned intact to the Licensor.
6.8 The Licensor shall provide amendments and additions to the Documentation for the correction of errors in the Documentation and for
documenting updates to the Software.
7 PERFORMANCE
7.1 The Licensor undertakes that, provided it is operated in accordance
with the Licensors instructions, the Software will perform in accordance
with the Documentation existing at the date of delivery. The Licensor
does not guarantee that the Software is free of minor errors not materially aecting such performance. The undertaking given in this Clause
is in lieu of any condition or warranty express or implied by law as to
the quality or tness for any particular purpose of the Software.
8 USE
8.1 The Software shall be used only for the Licensee's own data processing
and shall not be used to provide a data processing service to any third
party whether byway of trade or otherwise.
8.2 The Licensee may not transfer the Software permanently to another
location without the consent in writing of the Licensor which shall not
be unreasonably withheld.
8.3 The Licensee shall follow all reasonable instructions given by the Licensor from time to time with regard to the use of the Software. The
Licensee shall permit the Licensor, at all reasonable times, to verify
that the use of the Software is within the terms of the Licence.
9 COPYING
9.1 The Licensee may make only such copies of the Programs as are necessary for his operational use and security. This Licence applies to such
copies as it applies to the Programs.
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9.2 The Licensee may not make copies of the Documentation. At the request of the Licensee the Licensor shall provide such additional copies
of the Documentation as the Licensee may reasonably require for the
normal operation of his business, at the Licensor's then current standard scale of charges.
10 MODIFYING
10.1 The Licensee may not, without the prior written consent of the Licensor, modify the Software or incorporate the Programs in programs not
provided by the Licensor.
11 OWNERSHIP
11.1 Title, copyright and all other proprietary rights in the Programs and the
Documentation and all parts and copies thereof shall remain vested in
the Licensor.
11.2 The Security Devices shall remain the property of the Licensor.
11.3 The Licensee shall follow all reasonable instructions given by the Licensor from time to time with regard to the use of trade marks owned
by the Licensor andother indications of the property and rights of the
Licensor.
12 CHARGES
12.1 The licence and maintenance charges are published periodically by the
licensor. Once only licence charges shall not be subject to variation.
The Licensor shall have the right to vary periodic licence charges or
maintenance charges by giving to the Licensee not less than one month
written notice in advance of such variation eective at the end of the
initial 12 months period or at any time thereafter. Such variation shall
not result in the charges exceeding the Licensor's then current standard
scale of charges or, in the absence of a standard scale, such charges as
are reasonable in the circumstances.
13 TERMS OF PAYMENT
13.1 Following acceptance under Clause 4, the Licensor shall be entitled to
claim payment of those published licence charges.
13.2 All charges due under the Licence shall be paid by the Licensee within
30 days of receipt of a correct invoice.
13.3 The Licensee reserves the right to withhold payment against any invoice which is not submitted in accordance with the Licence and shall
forthwith notify to the Licensor in writing the reasons for withholding
payment.
13.4 If the payment of any sum due under the Licence shall be delayed by
the Licensee other than in accordance with Sub-Clause 13.3, the Licensor shall be entitled to charge interest on the amount of the delayed
payment for the period of the delay.
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APPENDIX D. SOFTWARE LICENSE AGREEMENT
13.5 The Licensee shall make payment of all sums due under the Licence in
pounds sterling unless otherwise agreed in writing by the Licensor.
14 TERMINATION
14.1 The Licensee may terminate the Licence by giving one month prior
written notice to the Licensor to take eect at the end of the initial 12
month period or such extension of this period as may be agreed or, if
no initial period is stated, by three months prior written notice to the
Licensor.
14.2 The Licensor may not terminate the Licence except in the circumstances described in Sub-Clauses 14.3 and 14.4.
14.3 The Licence may be terminated forthwith by either party on written
notice if the other party is in breach of the terms of the Licence and,
in the event of a breach capable of being remedied, fails to remedy the
breach within 14 days of receipt of notice thereof in writing.
14.4 Either party may terminate the Licence forthwith on written notice if
the other party shall become bankrupt or make an arrangement with
his creditors or go into liquidation.
14.5 Termination of the Licence shall not prejudice any rights of either party
which have arisen on or before the date of termination.
14.6 Within seven days following the date of termination the Licensee shall
return the Security Devices to the Licensor and shall at the option
of the Licensor return or destroy all copies, forms and parts of the
Programs and Documentation which are covered by this Licence and
shall certify to the Licensor in writing that this has been done.
14.7 The Licensee may terminate the support and maintenance service specied in Clause 6 by giving one month prior written notice to the Licensor
to take eect at the end of the initial period and subsequent periods as
specied in. The termination of the support and maintenance service
shall not constitute termination of the Licence and all obligations and
liabilities of the Licensee under the Licence remain. The Licensor's
obligations to provide source coding of the Programs under Clause 15
shall cease upon termination of the support and maintenance service.
15 SOURCE CODING
15.1 The Licensee shall not be provided with, nor allowed access to, the
source coding of the Programs or associated documentation except
under the provisions of Sub-Clauses 15.2 or 15.3.
15.2 In the event that the Licensor shall become bankrupt or go into liquidation, other than a voluntary liquidation for the purpose of reconstruction or amalgamation whilst the support and maintenance service
specied in Clause 6 is being provided, the Licensor shall, insofar as he
is permitted in law so to do, provide to the Licensee at no additional
charge a copy of the source coding of the Programs together with all
associated documentation.
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APPENDIX D. SOFTWARE LICENSE AGREEMENT
15.3 An Escrow service, if required, can be provided in lieu of the Licensor's
obligations under Sub-Clause 15.2.
15.4 In the event that the source coding is provided under the provisions of
Sub-Clauses 15.2 or 15.3, the Licensee's use of the source coding shall
be restricted to the purpose of maintaining the Programs.
16 THEFT
16.1 The Licensee shall immediately notify the Licensor in the event of theft
or other unlawful removal from the Licensee of the Software and the
Documentation and any part thereof at any time during the period of
the Licence.
17 INDEMNITY AND INSURANCE
17.1 The Licensor shall indemnify and keep indemnied the Licensee, against
injury (including death) to any persons or loss of or damage to any property (including the Software) which may arise out of the act, default
or negligenceof the Licensor, his employees or agents in consequence
of the Licensor's obligations under the Licence and against all claims,
demands, proceedings, damages, costs, charges and expenses whatsoever in respect thereof or in relation thereto, provided that the Licensor
shall not be liable for nor be required to indemnify the Licensee against
any compensation or damages for or with respect to injuries or damage
to persons or property to the extent that such injuries or damage result from any act, default or negligence on the partof the Licensee his
employees or contractors (not being the Licensor or employed by the
Licensor).
17.2 The Licensee shall indemnify and keep indemnied the Licensor against
injury (including death) to any persons or loss of or damage to any property (including the Software) which may arise out of the act, default
or negligenceof the Licensee, his employees or agents in consequence
of the Licensee's obligations under the Licence and against all claims,
demands, proceedings, damages, costs, charges and expenses whatsoever in respect thereof or in relation thereto, provided that the Licensee
shall not be liable for nor be required to indemnify the Licensor against
any compensation or damages for or with respect to injuries or damage to persons or property to the extent that such injuries or damage
result from any act, default or negligence on the partof the Licensor
his employees or contractors.
17.3 Without thereby limiting their responsibilities under Sub-Clauses 17.1
and 17.2, each party shall insure with a reputable insurance company
against all loss of or damage to property and injury to persons (including
death) arising out of or inconsequence of his obligations under the
Licence and against all actions, claims, demands, costs and expenses
in respect thereof, save only as is set outin the exceptions in Sub-Clause
17.4 and Clause 18.
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APPENDIX D. SOFTWARE LICENSE AGREEMENT
17.4 The liability of the parties under Sub-Clause 17.1 or 17.2, as appropriate, shall exclude damage or injury (other than injury including death
resulting from negligence) consequent upon design, formula, specication or advice. Except in respect of injury, including death to a person
due to negligence for which no limit applies.
17.5 The liability of either party to the other under Sub-Clauses 17.1 and
17.2 in respect of any one event or series of connected events shall not
exceed ve (5) times the license charges or 50,000, whichever is the
lesser.
18 CONSEQUENTIAL LOSS
18.1 Save as expressly stated elsewhere in the Licence, the Licensor shall
not be liable to the Licensee for consequential loss or damage including
loss of use or of prot or of contracts.
19 CONFIDENTIALITY
19.1 The Licensee shall keep condential the Programs and the Documentation or any part thereof and shall not disclose the same to any third
party without the prior written consent of the Licensor.
19.2 The Licensor and the Licensee shall keep condential the Licence and
all other information of the other party designated as `condential'
obtained under or in connection with the Licence and shall not divulge
the same to any third party without the prior consent of the other party.
19.3 The provisions of this Clause shall not apply to:any information in the public domain otherwise than by breach of thi
sLicence.
information in the possession of the receiving party thereof before divulgence as aforesaid.
information obtained from a third party who is free to divulge the same.
19.4 The Licensor and the Licensee shall divulge condential information
only to those employees who are directly involved in the Licence or the
use of the Software and shall ensure that such employees are aware of
and comply with these obligations as to condentiality.
19.5 The obligations of both parties as to disclosure and condentiality shall
come into eect on the signing of the Licence and shall continue in
force notwithstanding the termination of the Licence.
20 FORCE MAJEURE
20.1 Neither party shall be liable for failure to perform its obligations under
the Licence if such failure results from circumstances beyond the partys
reasonable control.
21 WAIVER
21.1 No delay, neglect or forbearance on the part of either party in enforcing
againstthe other party any term or condition of the Licence shall either
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APPENDIX D. SOFTWARE LICENSE AGREEMENT
be or bedeemed to be a waiver or in any way prejudice any right of that
party under the Licence.
22 ASSIGNMENT
22.1 Neither party shall assign any of its obligations under the Licence without the priorwritten consent of the other party, which shall not be
unreasonably withheld.
23 ARBITRATION
23.1 Any dispute or dierence which may arise between the Licensee and
the Licensor in connection with or arising out of the Licence may, by
agreement of both parties, be resolved by arbitration, in which event
such dispute or dierence shall be referred to a single arbitrator to be
agreed between the Licensee and the Licensor or, failing such agreement within fourteen days, to be nominated by the President for the
time being of the British Computer Society.
24 LAW
24.1 Unless otherwise agreed in writing between the parties, the Licence
shall be subject to and construed and interpreted in accordance with
English Law and shall be subject to the jurisdiction of the Courts of
England.
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Appendix E
Output Database
E.1 Overview
When you do \Write Results" in GMOOR the details of the run you have just
done are saved in a database for reporting purposes. If you do a batch analysis
or consequence analysis, the results are automatically written out to the database
without you hitting the \Write Results" button
This database is in Microsoft Access format. Specically it is in Access 97 format
which is a Jet 3.51 format database le, which is important to bear in mind if you
need to access it from MATLAB, Python, Perl, or some such language.
You can, if desired, write your own scripts to post-process the output database.
You can use any programming that provides a method of reading the mdb les. In
Windows you can use ODBC or ADO connections to open the les and use the
drivers that come with Windows. Pretty well all programming languages provide
a way of using ODBC or ADO. You will need to install extra drivers, however, to
support Jet 3.51 as they do not come standard with Windows XP. GMOOR does
not use ADO to write the data, so GMOOR does not install them either.
GMOOR reports are written in Python and GMOOR includes an embedded copy
of Python for running the reports. GMOOR passes some information like the
database path to the python script and the python generates the pdf report and
signals back to gmoor when it has nished. The reports issued with GMOOR are
in compiled Python, so that you don't see the source code, but there is no reason
why you can't write your own reports if desired, you do not even need to install
python, just add your report into the list of gmoor reports and obey the basic
syntax rules.
E.2 Database Tables
As of version v9.41 the database contains the following tables:
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APPENDIX E. OUTPUT DATABASE
Clearance Not used at present
Compnt This is mostly the input data on the components as read from the spread
le
CompntRes This is the output data for the components (end tensions, end po-
sitions, etc)
JobDet The data from the job details dialog
LineDyn Dyanmic Analysis Results
LineRes The major quasi-static line results (tensions, etc)
Loads Forces in vessel axis system
motions Motions in vessel axis system
Options Mostly the settings from the Units and Analysis Settings Dialog
Position Target position, Mean Equilibrium Position and Transient Osets
RunDet The Run Details table contains details on the analysis type for the run
and the input weather
Spread Spread options, ther than the component details
Thrust Thruster thrusts and azimuths
Vessel Masses, Stinesses and Damping
E.2.1 Clearance
This is reserved for future automatic clearance calculations
E.2.2 Compnt Table
Field Name
Buoy Pennant Length
Cd
ClumpOrBuoy
Cm
Component ID
Global Maritime
type
units
double
double
metres
-
long
-
double
-
long
-
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description
buoy pennant length
drag coecient of component
(only required for dynamic analysis)
Outer end connection type
(0=plain shackle, 1=clump
weight, 2=buoy)
mass coecient of component
(only required for line dynamics)
auto-incrementing row number
in the table, see also Component
No
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APPENDIX E. OUTPUT DATABASE
Field Name
Component No
type
units
-
description
Number of the component in the
leg (1 based, from anchor)
Density
double tonnes/cubic metre density of material in the component (only required for dynamic
analysis)
Description
text*255
The description of the component from the Spread le
EA1
double
tonnes
Elasticity (linear component)
from spread le
EA2
double
tonnes
Elasticity (quadratic component)
from spread le
EA3
double
tonnes
Elasticity (cubic component)
from spread le
Friction
double
Friction coecient
Leg No
long
Leg number form spread le
Length
double
metres
length of component
MBL
double
tonnes
breaking load of component
No of Seg
long
No of segments for line dynamics
(from spread le)
^
Proj Area
double
metres2
projected area per metre for line
dynamics
Sinker Friction/WPA
double
-/m^2
either sinker friction or waterplane area of buoy, depending on
ClumpOrBuoy
Sinker Wt/Buoyancy
double
tonnes
either sinker weight or buoy
buoyancy,
depending on
ClumpOrBuoy
Sinker/Buoy Cd
double
drag coecient of the sinker or
buoy
Sinker/Buoy Cm
double
added mass coecient of the
sinker or buoy
Sinker/Buoy Density
double,
tonnes/m^3
density of the sinker or buoy
Sinker/Buoy Proj Area double
metres^2
projected area of the sinker or
buoy
Weight(wet)
double
tonnes
weight per metre of the component in water
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APPENDIX E. OUTPUT DATABASE
E.2.3 CompntRes Table
Field Name
Component No
type
long
units
-
description
Number of the component in the
leg (1 based, from anchor)
Line No
long
Leg number from spread le
MaxPercentBreak double
the maximum percentage breaking load at either end of the component for all the motion combinations
MaxTension
double tonnes The maximum tension at either
end of the component for all the
motion combinations
MinSafetyFactor double
The minimum safety factor
(breaking load/tension) tension
at either end of the component
for all the motion combinations
Run ID
long
the run id as per RunDet table
E.2.4 JobDet Table
Field Name
type
Client Name
text*255
-
Project
text*255
-
Run Title
text*255
-
Run By
text*255
-
Run Date
date/time
-
Version
text*255
-
Job ID
long
units description
-
auto-incrementing row number
in the table
Client name from the Job Details
dialog
project name from the Job Details dialog
Run Title from the Job Details
dialog
Run By from the Job Details dialog
Run date and time - automatically generated
full version and build of GMOOR
(eg \Gmoor32DGT V9.409c
build 5431")
E.2.5 LineDyn Table
Introduction
This is probably the most complicated table to understand, so will be given a fuller
explanation.
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APPENDIX E. OUTPUT DATABASE
General meaning of elds in dynamics tables
Field Name
type
units
Run ID
Leg
Case
Combination
Compt
Int
Int
Int
Int
Int
1 or 2
0, 1 or 2
-
ICA
Int
-
IEA
Int
-
TaMean1
Double
tonnes
TaDyn1
Double
-
pcBrk1
Tamean2
Double
Double
-
TaDyn2
Double
-
pcBrk2
Double
-
Generally means this . . . but
varies depending on code
Run ID
Mooring Line number 1-NLINES
Motion combination case
Motion combination case
Component No (numbering from
1 at anchor)
component with the highest dynamic tension
End with the highest dynamic
tension (1=fairlead end 2=anchor end)
`Mean' Tension at fairlead end of
compt
`Dynamic' Tension at fairlead
end of compt
% break at fairlead end of compt
`Mean' Tension anchor end of
compt
`Dynamic' Tension at anchor end
of compt
% break at anchor end of compt
The dynamics elds in the RunDet table
Field Name type
Dynamics
Int
units
description
0 or 1 1 if line dynamics ag set in Analysis Tab
The dynamics elds in the Options table
Field Name
Page 175
type
units description
Code
QSIntactSF
QSslfailSF
Text*255
Double
Double
-
QStransSF
Double
-
DYNIntactSF
DYNslfailSF
Double
Double
-
DYNtransSF
Double
-
Name of Code (see code table)
Quasi-Static Intact Safety factor
Quasi Static Single Line Failed
Safety factor
Quasi Static Transient Safety
factor
Dynamic Intact Saftey factor
Dynamic Single line Failed Safety
factor
Dynamic Transient Safety factor
GM-44445-0407-37028
Global Maritime
GMOOR
APPENDIX E. OUTPUT DATABASE
Code Names
Code No
0
1
2
3
4
5
6
Code Name
API RP2SK
DNV-OS-E301 Consequence Class 1
DNV-OS-E301 Consequence Class 2
POSMOOR - Operating Condition I
POSMOOR - Operating Condition II
POSMOOR V - Operating Condition I
POSMOOR V - Operating Condition II
No of Cases
2
1
1
1
1
1
1
Overview
There are always 2 x (Total No of Components in all Lines) records in the database
irrespective of which code is selected. The database format has evolved over time
and it is now not obvious what data is in which elds. In fact the data in the elds
has a dierent meaning dependant on which code.
The line dynamics routine has the mean position, the LFsig and LFmax resolved
into the line direction and the WFsig and WFmax resolved into the line direction
available to it for each code.
The oscillation for the dynamic analysis (XAMP/YAMP) is set as the X and Y
components (horizontal/vertical) of the maximum downline wave frequency motion calculated at the fairlead with the vessel at the prescribed oset (which varies
with each code) .
The period of the oscillation used for the line dynamic calculation is obtained from
the zero crossing period of the downline motion spectrum
p
Period = 2 m0 =m2
In fact the sea and swell combined average period is determined by :period = (SeaRespZSeaResp2 +SwellRespZSwellResp2 )=(SeaResp+SwellResp)
SearespZ =
SwellrespZ =
Swellresp =
Searesp =
Zero Crossing Period of Downline motion from sea
Zero Crossing Period of Downline motion from swell
Signicant downline motion due to swell
Signicant downline motion due to sea
API code
For the API you have to calculate dynamic tension at two osets (2 Cases) and
pick the highest :Case=1 refers to (LFmax + WFsig)
Case=2 refers to (LFsig + WFmax)
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APPENDIX E. OUTPUT DATABASE
For each line, 2 vessel positions are calculated
Mean + LFMax (resolved to line direction)
Mean + LFSig (resolved to line direction)
Using the program internal variable and routine naming convention, the procedure
is as follows.
The (horizontal) tensions (HCOMP) are calculated at each of those positions
and the maximum wave frequency motion resolved down the line (XAMP/YAMP)
calculated and then the dynamic tension routine (TRANSDYN) is called
TRANSDYN rst calculates the equilibrium of the lumped mass model (EQBMSOLV) for the 2 Cases and the equilibrium tensions are recorded at the ends of
all components (TBAR). Then the dynamic tensions at the 2 positions are calculated (TAMP). For each end of each component, the max percentage breaking
load (PCB) of the combined tension (TBAR+TAMP) is calculated for each case.
The results are written to the database as follows
Field
Description
Combination 0 always (not used)
Case
1 or 2 as dened above both sets of results are relevant
Leg
Leg number
Compt
component with the highest combined
tension (numbering from 1 at anchor)
IEA
end of component the highest combined
tension (2 =anchor end 1=fairlead end)
TaMean1
Mean Tension (TBAR) at fairlead end of
component
TaDyn1
Dynamic Tension (TAMP) at fairlead end
of component
pcBrk1
% break (PCB) using combined tension
at fairlead end of component
TaMean2
Mean Tension (TBAR) at outer end of
component
TaDyn2
Dynamic Tension (TAMP) at outer end
of component
pcBrk2
=% break (PCB) using combined tension
at outer end of component
Note that the mean tensions (TaMean) in this case is the static tension at the
osets of the 2 motion combination cases ie (mean + LFmax) and (mean +
LFsig) and it is taken from the lumped mass model equilibrium solution.
The on screen display for the API code consists of the following for each leg :The dynamic report for the API code gives the following columns for both motion
combination cases:Page 177
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GMOOR
APPENDIX E. OUTPUT DATABASE
Label
Meaning
Fld Mean + LF TaMean for the Case with the highest
pcBrk
Fld WF
TaDyn for the Case with the highest
pcBrk
Fld Total
TaMean+TaDyn for the Case with the
highest pcBrk
Max % Brk
Highest of pcBrk1 and pcBrk2
Component
ICA for the Case with the highest pcBrk
End
IEA for the Case with the highest pcBrk
API
code on-screen display
Label
Leg No
Status
Mean+LF
Meaning
Mooring line number
Line Status (Broken, Intact, etc)
TaMean for Component/End with highest pcBrk for Both Cases
WF
TaDyn for Component/End with highest
pcBrk for Both Cases
Total
TaMean+TaDyn for Component/End
with highest pcBrk
Anchor Tension Mean+LF TaMean at anchor end for both cases
Anchor Tension WF
TaDyn at Anchor end for both cases
Maximum Percent MBL
pcBrk for Component/End with highest
pcBrk for Both Cases
<no label>
Case Description
Maximum line Tension
The maximum combined tension in any
leg in either case
Min Safety factor
The minimum safety factor (100/pcBrk)
for any leg in either case
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APPENDIX E. OUTPUT DATABASE
DNV OES 301 Codes
For the DNV OES 301 codes, you run the dynamic analysis at one oset only.
The characteristic dynamic tension Tcdyn, is given by :Tcdyn = Tqs[Xc Xwfmax ] Tcmean + Twfmax
Twfmax is the dynamic tension calculated at location Xc-Xwfmax
Xc is the larger of
Xmean + Xlfmax + Xwfmax and
Xmean + Xlfsig + Xwfsig
Tqs is the quasi static tension calculated at position [Xc-Xwfmax ]
Tcmean is the tension at the mean oset (i.e. under mean loads only - no motions).
The Reserve tension is given by
Reserve = ScSFmean TcMean Tcdyn SFdyn
Sc = characteristic strength (0.95 x minimum break load)
SFmean = partial safety factor on mean tension
SFdyn = partial safety factor on dynamic tension
The procedure in GMOOR is as follows, again using internal variable and routine
naming conventions.
For each line the mean tensions (TCMEAN) are calculated at each end of each
component at the mean oset. These are the tensions calculated by the GMOOR
analytic routines not the lumped mass routines so they are the same as the mean
tensions you get from a Detailed Output report of the same run.
The characteristic oset Xc is the highest of (LFmax+WFsig) and (LFsig+WFmax)
the COMBINATION is set to 1 or 2 to indicate which motion combination has
been used for Xc.
The (horizontal) tension for the dynamic analysis (HCOMP) is calculated at the
oset Xc-Xwfmax . The tensions at each end of each component at this oset are
recorded (TQSX).
After Transdyn is run, the results are written to the database as follows
Note : pcBrk1 and pcBrk2 have values against them for Case=1, but this is only
for the convenience of reporting, the values are not signicant (actually they are
Reserve+1)
The on screen display on the leg tab is as follows
The dynamic report for the DNV OES 301 Codes gives the following columns for
both motion combination cases:Page 179
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GMOOR
APPENDIX E. OUTPUT DATABASE
Field Description
Combination
1 or 2 depending on
whether Xc is the larger of
Xmean+Xlfmax +Xwfmax
and
Xmean+Xlfsig +Xwfsig
Case
Case=1 and 2 are written to the
database but the results are only
valid for Case=2
Leg
Leg number
Compt
component number (numbering
from 1 at anchor)
ICA
The number of the component
with the lowest Reserve tension
(numbering from 1 at anchor)
IEA
The number of the end of the
component with the lowest Reserve Tension (2 =anchor end
1=fairlead end)
TaMean1
Tension at mean oset at inner
end of component (TcMean)
TaDyn1
TcDyn at inner end of component
pcBrk1
The Reserve Tension at inner end
of component
TaMean2
Tension at mean oset at outer
end of component (TcMean)
TaDyn2
TcDyn at outer end of component
pcBrk2
The Reserve Tension at outer end
of component
Label
TcMean
Meaning
TcMean for Component/End
ICA/IEA
TcDyn
TaDyn for Component/End
ICA/IEA
Reserve
Reserve for Component/End
ICA/IEA
Component ICA (The number of the component with the lowest Reserve tension (numbering from 1 at anchor)
End
IEA (The number of the end of
the component with the lowest
Reserve Tension (2 =anchor end
1=fairlead end))
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APPENDIX E. OUTPUT DATABASE
Label
Leg No
Status
Fairlead Tension - TcMean
Fairlead Tension TcDyn
Fairlead Tension -Total
Anchor Tension TcMean
Anchor Tension TcDyn
Minimum Reserve
<no label>
Maximum line Tension
Min Reserve
Meaning
Mooring line number
Line Status (Broken, Intact, etc)
TcMean at the fairlead
(TaMean1)
TcDyn at the fairlead (TaDyn1)
TcMean+TcDyn at fairlead
TcMean at Anchor (TaMean2)
TcDyn at Anchor (TaDyn2)
Reserve for Component/End with
lowest Reserve for Both Cases
Motion Combination Description
The maximum Total tension in
any leg (at either component end)
The minimum reserve for any leg
(at either component end)
POSMOOR Codes
For the POSMOOR codes, you again run the dynamic analysis at only one oset.
POSMOOR states that the dynamic analysis should be carried out at an oset
of:XLF = XTOT X MAXHF
XTOT comes from the Quasi Static analysis and is either :XTOT = XMEAN + X MAXLF + X SIGNW F when X MAXLF > X MAXW F
Or
XTOT = XMEAN + X MAXW F + X SIGNLF when X MAXLF < X MAXW F
XTOT = Quasi static position at which line tensions are calculated
XMEAN = mean oset due to static loads
X MAXLF = maximum low frequency motion from wind and waves
NB. In POSMOOR the max/sig factor for the 2nd order motions is calculated
using the Stansberg Distribution (see POSMOOR Pt 6 Ch 2 Sec3 B300). This
gives a completely dierent to the API and DNV OS E301 even though is the
same.
X MAXW F = maximum wave frequency motion
X SIGNLF = signicant low frequency motion from wind and waves
X SIGNW F = signicant wave frequency motion
X SIGNHF = assumed the same as X SIGNW F
The procedure in GMOOR is rst to determine the oset for the dynamic analysis,
from (1) and (2) or (3). The COMBINATION selected is recorded.
The line tensions are calculated at the selected oset and the horizontal tension
(HCOMP) set for the line dynamics calculation. The motions at the fairlead are
Page 181
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GMOOR
APPENDIX E. OUTPUT DATABASE
calculated using the fairlead angle at this oset and the x/y components of the
maximum downline motions (XAMP/YAMP) set, then the line dynamics routine
TRANSDYN is called.
After Transdyn is run, the results are written to the database as follows
Field
Description
Combination 1 or 2 depending on which combination is used for
Case
Case=1 and 2 are written to the
database but the results are only
valid for Case=2
Leg
Leg number
Compt
component number (numbering
from 1 at anchor)
ICA
The number of the component
with the highest percent break
(numbering from 1 at anchor)
IEA
The number of the end of
the component with the highest
percent break (2 =anchor end
1=fairlead end)
TaMean1
Tension at as calculated by
lumped mass routine EQBMSOLV at fairlead end of component
TaDyn1
Dynamic tension calculated at
oset at fairlead end of component
pcBrk1
The percent breaking load
using the combined tension
(TaMean1+TaDyn1)
TaMean2
Tension at as calculated by
lumped mass routine EQBMSOLV at outer end of component
TaDyn2
Dynamic tension calculated at
oset at outer end of component
pcBrk2
The percent breaking load
using the combined tension
(TaMean2+TaDyn2)
The on screen display on the leg tab is as follows
The dynamic report for the POSMOOR Codes gives the following columns for
both motion combination cases:-
E.2.6 LineRes
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APPENDIX E. OUTPUT DATABASE
Label
Meaning
Fld Mean + LF TaMean1 at the component/end
given by ICA/IEA) i.e. not necessarily the fairlead label is misleading
Fld WF
TaDyn1 at the component/end
given by ICA/IEA) i.e. not necessarily the fairlead label is misleading
Fld Total
(Fld Mean+LF) + Fld WF
Max % Brk
Maximum percent break. (Percent break at the component/end
given by ICA/IEA) ie not necessarily the fairlead
Component
ICA
End
IEA shown as Inner or Outer
Label
Leg No
Status
Fairlead Tension Mean+LF
Meaning
Mooring line number
Line Status (Broken, Intact, etc)
TaMean at the fairlead
(TaMean1)
TaDyn at the fairlead (TaDyn1)
TaMean1+TaDyn1 at fairlead
Fairlead Tension WF
Fairlead Tension -Total
Anchor Tension Mean+LF7 TaMean at Anchor (TaMean2)
Anchor Tension WF
TaDyn at Anchor (TaDyn2)
Maximum Percent MBL
Percent break load for Component/End with hightest percent
break
<no label>
Motion Combination Description
Maximum line Tension
The maximum Combined tension
in any leg (at either end of components)
Min Safety Factor
The minimum safety factor
(100/pcBrk) for any leg
Page 183
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GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
type
units
Max Combination
long
-
Run ID
Line No
Status
long
long
long
-
Payout
double metres
Change
Min Fairlead Tension
double metres
double tonnes
Mean Fairlead Tension
Max Fairlead Tension
double tonnes
double tonnes
Tension at Anchor
double tonnes
Vertical Force At Anchor
Minimum Grounded Length
Maximum Grounded Length
% MBL
double tonnes
double metres
double metres
double
-
Factor of Safety
double
Trans Min Tension
double tonnes
Trans Max Tension
double tonnes
Trans Max+Sig Tension
double tonnes
Trans Max Time
double
-
secs
description
link to RunDet table
mooring line number
line status. 0=not deployed,
1=intact, 2=broken.
The motion combination that
gives the highest tension at the
fairlead
total line payout from fairlead to
anchor
payout change from last reset
Minimum fairlead tension (all
combinations)
Mean fairlead tension.
Maximum fairlead tension (all
combinations)
Maximum tension at anchor (all
combinations)
Maximum uplift force at anchor
Minimu grounder length
Maximum Grounded Length
The maximum % of the breaking
load at either end of any component
The minimum saftety factor at
either end of any component
The minimum tension from the
transient analysis - no 1st or 2nd
order motion added
The maximum tension from the
transient analysis - no 1st or 2nd
order motion added
The maximum tension from the
transient analysis - signicant 1st
and 2nd order motion added
The time of the Trans Max Tension
E.2.7 Loads Table
Field Name
type
units
Run ID
WindX
long
double
tonnes
WindY
double
tonnes
Global Maritime
description
the run id as per RunDet table
mean wind force in X (+stbd)
vessel axis
mean wind force in Y (+fwd)
vessel axis
GM-44445-0407-37028
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GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
WindN
SeaX
SeaY
SeaN
SwellX
SwellY
SwellN
CurrX
CurrY
CurrN
RiserX
RiserY
RiserN
ExtraX
ExtraY
ExtraN
MoorX
MoorY
Page 185
type
units
description
double tonne-metres mean wind monent (+anticlockwise)
double
tonnes
mean wave drift force from Sea
component in X (+stbd) vessel
axis
double
tonnes
mean wave drift force from Sea
component in Y (+fwd) vessel
axis
double tonne-metres mean wave drift moment from
Sea component (+anticlockwise)
double
tonnes
mean wave drift force from Swell
component in X (+stbd) vessel
axis
double
tonnes
mean wave drift force from Swell
component in Y (+fwd) vessel
axis
double tonne-metres mean wave drift moment from
Swell component (+anticlockwise)
double
tonnes
mean current force (combined
tide & wind induced) in X
(+stbd) vessel axis
double
tonnes
mean current force (combined
tide & wind induced) in Y
(+fwd) vessel axis
double tonne-metres mean current moment (combined tide & wind induced)
(+anticlockwise)
double
tonnes
mean top riser horizontal force in
X (+stbd) vessel axis
double
tonnes
mean top riser horizontal force in
Y (+fwd) vessel axis
double tonne-metres mean top riser moment (+anticlockwise). This only arises if the
riser top is oset from the vessel centre. There is no rotational
stiness in the riser.
double
tonnes
extra force in X (+stbd) vessel
axis
double
tonnes
extra force in Y (+fwd) vessel
axis
double tonne-metres extra moment (+anticlockwise)
double
tonnes
mooring force in X (+stbd) vessel axis
double
tonnes
mooring force in Y (+fwd) vessel
axis
GM-44445-0407-37028
Global Maritime
GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
MoorN
ThrusterX
ThrusterY
ThrusterN
type
units
description
double tonne-metres mooring moment (+anticlockwise) vessel axis
double
tonnes
thruster force in X (+stbd) vessel axis
double
tonnes
thruster force in Y (+fwd) vessel
axis
double tonne-metres thruster moment (+anticlockwise)
E.2.8 Motions Table
Field Name
type
units
description
PitchWFMax
PitchWFSig
Double
Double
deg
deg
RollLFMax
Double
deg
Pitch Wave Frequency Maximum
Pitch Wave Frequency Signicant
roll low frequency maximum (not
calculated at present, always
zero)
ExtraSurgeMax Double metres Extra surge Max (as entered in
Interactive Dialog))
ExtraSurgeSig Double metres Extra surge Sig
ExtraSwayMax Double metres Extra sway Max (as entered in
Interactive Dialog)
ExtraSwaySig Double metres Extra sway Sig
ExtraYawMax Double deg Extra yaw Max (as entered in Interactive Dialog)
ExtraYawSig
Double deg Extra yaw Sig
HeaveLFMax
Double metres Heave low frequency maximum
(not calculated at present, always zero)
HeaveLFSig
Double metres Heave low frequency signicant
(not calculated at present, always zero)
HeaveWFMax Double metres Heave Wave Frequency Maximum
HeaveWFSig
Double metres Heave Wave frequency signicant
PitchLFMax
Double deg Pitch low frequency maximum
(not calculated at present, always zero)
PitchLFSig
Double deg Pitch low frequency signicant
(not calculated at present, always zero)
Global Maritime
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GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
RollLFSig
Double
type
units
deg
roll low frequency signicant
(not calculated at present, always zero)
description
RollWFMax
RollWFSig
Run ID
SurgeLFMax
SurgeLFSig
SurgeWFMax
SurgeWFSig
SwayLFMax
SwayLFSig
SwayWFMax
SwayWFSig
YawLFMax
YawLFSig
YawWFMax
YawWFSig
Double
Double
Long
Double
Double
Double
Double
Double
Double
Double
Double
Double
Double
Double
Double
deg
deg
metres
metres
metres
metres
metres
metres
metres
metres
deg
deg
deg
deg
Roll Wave frequency Maximum
Roll Wave Frequency Signicant
link to RunDet table
Surge low frequency maximum
Surge low frequency Signicant
Surge wave frequency maximum
Surge wave frequency Signicant
Sway low frequency maximum
Sway low frequency maximum
Sway wave frequency Signicant
Sway wave frequency Signicant
yaw low frequency maximum
yaw low frequency maximum
yaw wave frequency Signicant
yaw wave frequency Signicant
E.2.9 Options Table
Field Name
Page 187
Code
Long
type
units
Current Direction
Long
0/1
Current speed units
Long
Current Type
Long
Directions
Long
-
description
The mooring code from the
code Tab in the Units and
Analysis Settings . 0=API
RP2SK,
1=DNV-OS-E301
- Consequence Class 1,
2=DNV-OS-E301 - Consequence Class 2,3=POSMOOR - Operating Condition
I,4=POSMOOR - Operating
Condition
II,5=POSMOOR
V - Operating Condition
I,6=POSMOOR V - Operating
Condition II
Current Direction Convention :
From=0 Towards=1
0/1/2 Current speed units : 0=m/s;
1=knots; 2=ft/s
0/1 Current Type : 0=surface current; 1=prole current
0/1 Directions Generally : 0:True;
1:Relative
GM-44445-0407-37028
Global Maritime
GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
DYNIntactSF
type
units
-
description
Code dependant safety factor Dynamic Intact
DYNslfailSF
Double
Code dependant safety factor Dynamic Singler Line Failure
DYNtransSF
Double
Code dependant safety factor Transient
Forces
Long 0/1/2 force units generally : 0:tonnes;
1:kN; 2:kips
Gamma
Double
Sea spectrum gamma for variable gamma spectrum
Lengths
Long
0/1 length units generally : 0:metres;
1:feet
Options ID
Long
Link to this table
Payouts
Long
0/1 payout units : 0:metres; 1:feet
QSIntactSF
Double
Code dependant safety factor Quasi Static Intact
QSslfailSF
Double
Code dependant safety factor Quasi Static Single Line Failure
QStransSF
Double
Code dependant safety factor Quasi Static Transient
SimIncrement
Double secs Simulation time step for transient analysis
SimTime
Double secs Simulation time for transient
analysis
Storm Duration
Long hours Sea Storm Duration for calculation of sig/max factors
Swell Gamma
Double
Swell spectrum gamma for variable gamma spectrum
Swell Height Units
Long
Swell height Units : 0=metres
1=feet
Swell Period Type
Long
Swell Period Type : 0=Tz 1=Tp
Swell Spectrum
Long 1/2/3 Swell Spectrum Type : 1 =
MEAN JONSWAP, 2 = PIERSON MOSKOWITZ, 3 = VARIABLE GAMMA
Swell Spreading
Long
0/1 Swell Spreading : 0=spreading
o 1=spreading on
Swell Spreading Exponent Double
Swell Spreading Exponent
Swell Storm Duration
Long
Swell Storm Duration for calculation of sig/max factors
Wave Height Units
Long
0/1 Sea Height Units : 0=metres
1=feet
Wave Period Type
Long
0/1 Sea Period Type : 0=Tz 1=Tp
Wave Spectrum
Long 1/2/3 Sea Spectrum : 1=MEAN
JONSWAP,
2=PIERSON
MOSKOWITZ, 3=VARIABLE
GAMMA
Global Maritime
Double
GM-44445-0407-37028
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GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
type
Wave Spreading
Long
units
0/1
Wave Spreading Exponent Double
Wind Average Period
Long 0/1/2
Wind Induced Current
Long
Wind Ref Height
Wind Spectrum
0/1
Double metres
Long 0/1/2
Wind Speed Units
Long
0/1/2
description
Sea spreading : 0=spreading o
1=spreading on
Sea Spreading Exponent
Wind Averaging Period : 0:1hr;
1: 10 mins; 2: 1 min
Wind Induced Current : 0 =
wind-induced current, 1 = no
wind-induced current
Wind Speed Reference Height
Wind Spectrum : 0=API RP2A
1=NPD (Sletringen) 2=Ochi &
Shin
Wind Speed Units : 0=m/s;
1=knots; 2=ft/s
E.2.10 Position Table
Field Name
EquilibriumN
type
units
description
Double degrees Solved Equilibrium position
(heading)
EquilibriumX
Double metres Solved Equilibrium position
(east)
EquilibriumY
Double metres Solved Equilibrium position
(north)
Run ID
Long
Link to RunDet table
TargetN
Double degrees Target Heading
TargetX
Double metres Target position - Easting
TargetY
Double metres Target Position - Northing
Tran Max Oset E
Double metres Transient Max Oset from Target Position - no WF motion
(east oset)
Tran Max Oset H
Double metres Transient Max Oset from Target Position - no WF motion
(heading oset)
Tran Max Oset N
Double deg Transient Max Oset from Target Position - no WF motion
(north oset)
Tran Max Oset Time Double secs Time of Transient Max Oset
Trans Max Oset
Double metres Transient Max Oset from Target Position - no WF motion
(radial oset)
Trans Max+Sig Oset Double metres Transient Max Oset from
Time=0 Position - including
signicant 1st + 2nd Order
motion (radial oset)
Page 189
GM-44445-0407-37028
Global Maritime
GMOOR
APPENDIX E. OUTPUT DATABASE
E.2.11 RunDet Table
Field Name
type
units
Selected
long
-
Spread ID
Options ID
Job ID
long
long
long
-
Batch ID
Title
long
text*255
-
SubTitle
text*255
-
Date/Time
-
Draught
Water Depth
Tide
Beaufort Number
double
double
double
long
meters
metres
metres
-
Wind Speed
Wind Direction
Hsea
Tsea
double
double
double
double
metres/sec
deg
metres
secs
Sea Direction
Hswell
double
double
deg
metres
Tswell
double
secs
Swell Direction
Resultant Current
Speed
Resultant Current
Direction
Surface Current
Speed
Surface Current
Direction
Wind Induced
Current Speed
Wind Induced
Current Direction
double
double
degs
metres/sec
double
deg
double
metres/sec
double
deg
double
metres/sec
double
deg
Run ID
Time Label
Global Maritime
long
-
GM-44445-0407-37028
description
The run id links all the tables together
This is used by the report viewer
to select runs for viewing
Link to the Spread table
link to the options table
link to the Job Details table
(JobDet)
link to the Batch table
The Case title from the interactive dialog
This is used in the batch and
consequence analysis results to
label the individual cases
the date and time of the run (automatically generated)
Vessel draft
Water Depth at vessel
tide height in metres
Beaufort Number.
This is
only non-zero if the user enters
weather as a beaufort number
used wind speed
wind direction
Signicant Wave Height for Sea
Mean Zero Crossing Period for
Sea
Sea Direction
Signicant Wave Height for
Swell
Mean Zero Crossing Period for
Swell
Swell Direction
resultant current speed at surface including wind generated
dirtection of resultant current
speed
Surface (tidal) current speed
direction of surface current
speed
Wind Induced Current Speed
direction of Wind Induced Current
Page 190
GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
type
units
Extra Force
double
tonnes
Extra Force
Direction
Additional Sway
Damping
Additional Surge
Damping
Additional Yaw
Damping
Line Control
double
deg
Current Prole
long
double
double
double
long
Analysis Type
long
Failure Type
long
Failure
long
LFTD
long
Line Damping
long
Wave Drift Damping
Second Order
long
long
Dynamics
long
Status
long
-
description
1 if a current prole has been
used, else 0
Extra force from interactive dialog
Extra Force Direction
tonnes/(metre/sec) Extra sway damping from Interactive dialog
tonnes/(metre/sec) Extra surge damping from Interactive dialog
tonnes/(radian/sec) Extra yaw damping from Interactive dialog
This is zero in all present and previous versions - line control is not
implemented
Equilibrium=0, Single Line
Failure (SLF)=1,Transient=2,
3=reserved, 4=reserved
Used in (and only relevant for)
SLF and Transient analysis.
-1=Line not deployed, 0=Break
line, 1=Fail Thruster,
2=Blackout. For other types of
analyiss this will be zero.
the actual failure case - number
of the line or the number of the
thruster
ag showing whether LFTD was
enabled. 1=LFTD was enabled
ag showingwhether mooring
line damping was enabled
ag shoowing whether wave drift
damping was enabled
Flag showing whether second order motion was enabled
ag showing whether Line Dynamics was enabled
Unused - always zero
E.2.12 Spread Table
Field Name
Page 191
type
Anchor Bearing
Double
Anchor Range
Double
units
description
radians Bearing of Anchor (true) from
vessel centre
metres Distance of anchor from vessel
centre
GM-44445-0407-37028
Global Maritime
GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
type
units
Anchor Water Depth
Fairlead X
Double
Double
Fairlead Y
Double
Fairlead Z
Double
Field File
Field Title
IsCVF
IsGangway
Text*255
Text*255
Long
Long
IsRiser
Long
Leg No
Long
NumThrusters
Riser File
Seabed Slope
Spread File
Spread ID
Spread Title
Vessel File
Long
Text*255
Double
Text*255
long
Text*255
Text*255
Vessel Title
Text*255
description
metres Depth at Anchor
metres distance of fairlead from vessel
centre (Vessel Axis) starboard
+'ve (as per CVF or VSL le)
metres distance of fairlead from vessel centre (Vessel Axis) forward
+'ve (as per CVF or VSL le)
metres distance of fairlead vertically
from vessel keel, up +'ve (as per
CVF or VSL le)
Field File name excluding path
Title from Field File
0 or 1 1 if a CVF le was given, else 0
0 or 1 1 if a gangway was specied
(*GANGWAY in SPD le), else
0
0 or 1 1 if a riser le was specied
(*RISER in SPD le), else 0
anchor line number (1 to no of
lines)
number of thrusters
Riser File name excluding path
Slope at anchor
Spread le name excluding path
used to link tables to this one
Title from the Spread File
Vessel File name (either the VSL
or CVF le) excluding path
Title from the CVF/VSL le
E.2.13 Thrust Table
Field Name
Azimuth
Identity
iFree
Percent
Power
Run ID
Status
Global Maritime
type
Double
units
description
radians Thruster azimuth (angle of the
force) relative to vessel head
Text*255
Description o thfe thruster from
the CVF/VSL File
Long
0 or 1 0 = Free azimuthing 1=xed
(not sure it is actually ever set
though)
Double 0-100 Percent (of thrust) of the
thruster
Double
kW Power of the thruster
Long
link to RunDet table
Long
0 or 1 status of thruster 1=used 0=not
in use
GM-44445-0407-37028
Page 192
GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
Thrust
Thruster No
Type
type
Double
Long
Long
X
Double
Y
Double
Z
Double
units
description
tonnes Thruster thrust
Thruster Number (1 to no of
thrusters)
Thruster Type (as per CVF definition) ITYPE 1=Azimuth unit
(allowed to rotate) 2=Non rotating pod type thruster 3=Tunnel Thruster 4=Main propellor
metres distance of thruster from vessel centre (Vessel Axis) starboard
+'ve (as per CVF or VSL le)
metres distance of thruster from vessel centre (Vessel Axis) forward
+'ve (as per CVF or VSL le)
metres distance of thruster vertically
from vessel keel, up +'ve (as per
CVF or VSL le)
E.2.14 Vessel Table
Field Name
Page 193
CritDampN
CritDampX
CritDampY
CVF
Double tonne.metres/(rad/sec)2
Double tonnes/(metres/sec)2
Double tonnes/(metres/sec)2
Long
0 or 1
type
units
LinDampingN
LinDampingX
LinDampingY
MassN
Double
Double
Double
Double
tonne.metres/(rad/sec)
tonnes/(metre/sec)
tonnes/(metre/sec)
tonne.metres2
MassX
Double
tonnes
MassY
Double
tonnes
NaturalPeriodN
NaturalPeriodX
NaturalPeriodY
QuadDampingN
QuadDampingX
QuadDampingY
Run ID
StinessN
StinessNX
StinessNY
StinessX
Single
Single
Single
Double
Double
Double
Long
Double
Double
Double
Double
secs
secs
secs
tonne.metres/rad/sec2
tonnes/(m/sec)2
tonnes/(m/sec)2
tonne.metres/rad
?
?
tonnes/metre
GM-44445-0407-37028
description
Critical Yaw Damping
Critical Sway Damping
Critical Surge Damping
Type of Vessel le : 0=CVF
1=VSL
Linear Yaw Damping
Linear Sway Damping
Linear Surge Damping
Yaw Total Inertia (inertia+added
inertia)
Sway Total Intertia (mass
+added mass)
Surge Total Intertia (mass
+added mass)
Natural Period in yaw
Natural Period in sway
Natural Period in surge
Quadratic Yaw Damping
Quadratic Sway Dampiing
Quadratic Surge Dampiing
Link to RunDet table
stiness matrix (2,2)
stiness matrix (2,0)
stiness matrix (2,1)
stiness matrix (0,0)
Global Maritime
GMOOR
APPENDIX E. OUTPUT DATABASE
Field Name
StinessXN
StinessXY
StinessY
StinessYN
StinessYX
Global Maritime
type
Double
Double
Double
Double
Double
units
?
?
tonnes/metre
?
?
GM-44445-0407-37028
description
stiness matrix (0,2)
stiness matrix (0,1)
stiness matrix (1,1)
stiness matrix (1,2)
stiness matrix (1,0)
Page 194
Appendix F
References
[1] Ochi M K and Shin Y S Wind Turbulent Spectra for Design Consideration of
Oshore Structures Paper OTC 5736 1988 OTC Houston
[2] American Petroleum Institute Recommended Practice for Planning, Designing and Constructing Fixed Oshore Platforms - Load and Resistance Factor
Design API RP2A-LRFD 1st Edition January 1993
[3] NORSOK STANDARD N-003 ACTIONS AND ACTION EFFECTSRev. 1,
February 1999
Page 195
GM-44445-0407-37028
Global Maritime