GLAST LAT Project
3-4 May 2005
LAT Environmental Test
Planning and Design Review
3-4 May 2005
2.0 Dynamics Tests
John Ku kuj@slac.stanford.edu
Naval Research Lab Bldg 226 Rm 113
Call-in number: 510-665-5437 Passcode: 3992
LAT Environmental Test PDR
1
GLAST LAT Project
3-4 May 2005
Tue May 3 PM Agenda
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2.0 Dynamics Tests (John Ku)
– 1:00 pm
2.1 Sine Vibe
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2:30 pm
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2:30
3:00
3:30
3:50
4:00 pm
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1:00
1:30
2:00
2:20
4:00
4:10
4:15
4:25
4:30 pm
2.1.1
2.1.2
2.1.3
2.1.4
Test Plan
Test Configuration
Test Logistics
Open Issues
2.2 Acoustic
2.2.1
2.2.2
2.2.3
2.2.4
Test Plan
Test Configuration
Test Logistics
Open Issues
2.3 Weight and CG
2.3.1
2.3.2
2.3.3
2.3.4
Test Plan
Test Configuration
Test Logistics
Open Issues
2.4 Open Issues
To get through these 57 Slides in 4 hours, we must average 4.2 minutes/slide
LAT Environmental Test PDR
2
GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Plan Overview
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Objectives of the test are well understood by all
– Verify the strength of the LAT and subsystem interfaces under PFQ loads and durations
– Measure primary natural frequencies (fn) of the primary modes of the LAT
– Determine transmissibility (Q) of the LAT
– Validate the math model used for coupled loads analysis
– Verify the workmanship and processes used in the manufacture and assembly
Test Plan
– Third draft of test plan is out for review – first major update in over a year
– Many technical details have been addressed in previous meetings – the current draft is
very mature and should be released in 1-2 weeks
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First comments in from GSFC mechanical branch have been minor and already incorporated
Instrumentation list is nearing completion, but not finished yet
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Internal accelerometers defined and CAD layout complete
Strain gauges (16 channels) on flexures defined (NRL can accommodate up to 40 channels, ¼
bridge)
External accelerometer mathematical positions defined, but CAD layout needed
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Plan Overview
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Test Plan (Continued)
– Entrance/Exit Criteria are well understood by all; from the test plan:
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The sine vibe dynamic test is the first environmental test to be performed after arrival to NRL and
the subsequent CPT. Criteria which must be met before this test can be executed are:
– LAT mechanical integration is complete—all visual, dimensional, and torque testing has
been complete, and all travelers verified to be complete. The LAT is in its flight
configuration, except as detailed in Section 8.3.
– All subsystem units/modules function—each subsystem has passed its CPT following
removal from the shipping container. Any performance discrepancies have been clearly
documented.
– Ensure all E-GSE needed is installed and functioning. After moving and attaching the LAT
to the vibration test equipment, ensure each subsystem has passed its LPT. All E-GSE
cable harnesses have been removed from the LAT prior to test.
– All test instrumentation is in place and functioning—instrumentation has been verified to be
securely mounted in the correct locations and oriented in the correct direction, as defined
in the test procedure, and electronics are working correctly, and reading out signals. Cable
harnesses for this instrumentation are connected and properly restrained for the test
– Pretest analysis which provides predictions for Fn and Q for significant modes at all test
accelerometers
Following the sine vibration test, an LPT will be performed. Prior to breaking test configuration,
the following criteria must be met:
– Visual inspection of the LAT indicates that there is no visible damage to the LAT
– Successful completion of the LPT verifies that all components and subsystems function
properly after testing
– Rough analysis of test data shows that all recorded data is useable for analysis purposes
– Comparison of pre-test and post-test modal signatures match to within 5%, or at the
discretion of the test director, showing that modal frequencies have not changed
significantly as a result of the test.
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Plan – Requirements
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Test Requirements
– Instrument Verification Plan
• The tests will be performed to the levels published in the LAT environmental
specification document, LAT-SS-00778
• The dynamics tests are to be performed in the mode in which the equipment will
observe the environment
– LAT will be launched in a “powered off” mode
– The sine vibration tests will be performed with the article powered off
LAT Protoflight Test Levels
Axis
Thrust
Z
X&Y
Lateral
Notes:
Freq. (Hz)
5 - 15
15 - 25
25 - 35
35 - 50
5 - 15
15 - 25
25 - 35
35 - 50
Sweep Rate
Test levels [g] [oct./min]
0.4
4
1.2
4
2.8
1.5
0.7
4
2.2
4
0.5
4
0.5
1.5
0.5
4
LAT and Subsystem Low-level Sine Test Levels
Test
Sweep Rate
[Oct/min]
Axis
Freq. (Hz) levels
All
(X, Y, & Z)
5 - 150
0.15 g
2
1) The test levels represent LAT Net CG responses
2) Input levels may be notched so that the interface
forces or response accelerations do not exceed
flight loads predictions
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Configuration
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The LAT is transported and supported on the TIP
– TIP is already installed for all handling before and after test
– TIP assembly uses SC flexures from Spectrum
– TIP is designed to simulate SC flexure/top deck interface,
so it provides a nearly flight-like interface for the test
Interface to both the slip table and expander head is by way of a
simple bolt pattern that fits well with the LAT geometry
X/Y-Axis Vibration Configuration
LAT Environmental Test PDR
Z-Axis Vibration Configuration
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GLAST LAT Project
3-4 May 2005
MGSE Requirements Flowing from Sine Vibe Test Plans
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See the table, below, for a list of all MGSE/STE that is needed for conducting the sine vibe test
Test Interface Plate
– TIP and mounting hardware capable of handling inertial loads of LAT during test
– TIP bolt pattern and size compatible with expander head and slip table
– TIP plate supported adequately to ensure stiff connection to slip table/expander head
Dust Tent
– Capable of providing clean, dry environment before/during/after vibe testing
– Provides clearance around LAT for unrestricted motion during vibe
– Capable of being on/off-loaded from GPR to vibe table
Heat Pipe Restraining Plates
– Supports DSHP/XLHP 3-way joints during vibe since Radiator VCHP’s are not mounted
– Provides flight-like interface to simulate VCHP flange
Chill Bars
– Capable of handling vibration loads (obviates need to de-/re-integrate them)
MGSE Assembly
Test Interface Plate Ass'y
Dust Tent
Grid Perimeter Ring
4x4 Lift Fixture
MGSE Cart
Heat Pipe Restraining Plates
Chill Bars and Aux. Cooling
LAT Environmental Test PDR
Use / Comments
Mounts LAT to slip table/expander head
Covers LAT in un-regulated environment
Lifting fixture for hoisting LAT into position
Lifting fixture for hoisting LAT into position
Parking space for GPR/4x4 Fixture
Supports un-attached DSHP's/XLHP's
Cool LAT for pre-/post-test LPT's
MGSE/STE Needed for Sine Vibe Testing
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GLAST LAT Project
3-4 May 2005
Auxiliary Cooling and Mechanical Handling
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Auxiliary cooling plans
– LAT needs to be cooled during LPT’s between each vibe axis run and before and after
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Chill Bars: one under each of the two X-wings on the Grid
X-LAT Aux Cooling: using fly-away cooling lines already mounted to X-LAT Plate
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–
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This is room-temperature cooling to remove LAT process heat
To simplify cooling connections, Chill Bars and X-LAT cooling will be designed to handle
vibe loads
– Hoses will be disconnected using quick-disconnect fittings
Handling and mechanical operating procedures
– LAT lifting procedure
– TIP mounting procedure
– Dust tent handling and operating procedure
– LAT auxiliary cooling system operating procedure
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
MGSE Issues for Sine Vibe Testing
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Dust Tent
– This is likely needed for sine vibe, but is still TBR
– If needed, how will dust tent be supported off of the slip table/expander head around the
LAT, while the LAT is vibed?
– How do we access the LAT for electrical and aux. cooling interconnects before/after vibe
testing?
– How is the Dust Tent handled with the LAT
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LAT is transported with the Tent hanging from the GPR
After integration on the slip table, the Tent will need to be re-positioned onto the vibe table base
Logistics in the vibe lab
– Space is tight in the vibe lab, and the LAT MGSE is large
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We will have 4 large-footprint objects in the lab nearly simultaneously
– LAT on the TIP
– GPR
– 4 x 4 Lift Fixture
– MGSE Cart
Vibe lab also has 2 vibe tables and the expander head which will need re-positioning during our
test
We will be running through the handling logistics with paper dolls, then with the
pathfinder, so we should be able to catch the problem areas early
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
MGSE Structural Analysis Status
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LAT Environmental Test PDR
TIP was analyzed for lift loads and dynamic
performance (see FEA Mesh shown at left)
– High margins were calculated for both cases
Rough calculations for the mounting shoes were
performed, with more detailed analysis to follow
– Conservative hand calculations show high
margins for strength and stiffness
Rough calculations for the test stand have been
performed, wth more detailed analysis to follow
– Concentrated on regions of highest load
– Design is extrememly stout, and calculations
show corresponding high strength margins
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GLAST LAT Project
3-4 May 2005
MGSE Structural Analysis – TIP – Lift case
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The TIP is only attached to the mounting shoes by 16 screws, in a thinned section
– When lifted, how much will the TIP sag from its own weight?  148 microns (0.6 mils)
– How much stress is imparted from the prying loads?  3.02 MPa (241 MPa Yield)
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
MGSE Structural Analysis – TIP – Dynamic Performance
Calculated First Mode = 417 Hz
Required Performance: >225 Hz (1.5*150 Hz)
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
MGSE Structural Analysis – Mounting Shoes
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
MGSE Structural Analysis – Test Stand
Test
Interface
Plate
LAT
Radiator
SC Strut
simulators
LAT Environmental Test PDR
Test Stand
Radiator
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Plan – Constraints
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EGSE Constraints
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Cables
– Disconnected during vibration
– Must be long enough to reach LAT while mounted to either expander head or slip table
– Cable trays or protection if laid on floor
Cart with EGSE Hardware
– Portable, can be rolled out of the way
– Power interface to lab?
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Configuration
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Mechanical Configuration
– Radiators not attached
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Mounted to GD/Spectrum Astro-provided test flexures
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By agreement with the GPO, no mass simulators are needed
Test flexures will be proof tested at SLAC prior to GRID static test
TIP to interface test flexures and slip table/expander head
– LAT Z-axis is always vertical
– Access to connectors needed (scaffold around expander head?) on +X side
– Layout needed to check cable run lengths
Electrical Configuration
– SLAC purchased accelerometers are voltage type and have 10-32 connectors, with a
special proprietary triax connector
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Adapters will be needed to interface with NRL equipment
ACD accelerometer interface to be verified
Strain gauges do not have connectors (open leads)
EGSE needed for LPTs between axes (Rich Baun to define requirements)
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Configuration – Instrumentation
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Test instrumentation by subsystem, total of 57 channels, calibrated and installed by SLAC I&T,
final checkout by NRL
Anti-Coincidence Detector
10 Accel Channels
10 Uni (9 Fly-away)
0 Tri (0 Fly-away)
Trackers
7 Accel Channels
7 Uni (7 Fly-away)
0 Tri (0 Fly-away)
Calorimeters
6 Accel Channels
0 Uni (0 Fly-away)
2 Tri (2 Fly-away)
Electronic Boxes
9 Accel Channels
5 Uni (3 Fly-away)
2 Tri (2 Fly-away)
Mechanical Systems
25 Accel Channels
1 Uni (1 Fly-away)
8 Tri (0 Fly-away)
500045
Bottom Edge
Center of Panel
-X
Y
500353
500599
Z
Y
500043
-X
Y
500021
500202
Z
-X
LAT Environmental Test PDR
Z
500142
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Configuration – Instrumentation
Z
301285
308801
Y
309282
X
Z
324985
307082
Y
315185
Z
230614
-Z
X
315085
LAT Environmental Test PDR
X
-Y
-Z
X
218623
-Y
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Configuration – Instrumentation
400580
Z
X
-Z
Z
-Y
400001
404665 (PDU)
401182
X
401618
Z
Z
401609
-Z
406023 (GASU)
Z
X
Z
103058
X
Z
Z
X
X
Y
Y
Y
Attach Accelerometers
to Clevis part of RMB
104216
Z
X
LAT Environmental Test PDR
Y
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Configuration – Instrumentation
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LAT Environmental Test PDR
Four strain gauges installed per flexure for a total
of 16 strain gauge channels
– Assumed to be 120 Ohm, ¼ bridge, GF=2
– Strain gauges should be temperature
compensated if possible
The gauges and data acquisition equipment should
be sized to capture a maximum strain of 2500
microstrain (titanium has a yield strain of 7500
microstrain) and have a 0.25% precision (6
microstrain error)
The combination of strain gauges will allow
measurement of axial strain and bending strain
– Shear strain will not be directly measured,
but may be ascertained from the combined
strain readings of the two legs and pre-test
analysis
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test Planning: Detailed Sequence
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Pre-test Activities
– Move dolly into position in vibration lab and disconnect LAT from dolly (SLAC-IFCT)
– Lift LAT and TIP onto expander head, and torque bolts (NRL)
– Cable Hook-ups and system checkouts
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Electrical connections to shaker system and accel tap checks (NRL)
Electrical connections to EGSE and perform LPT on expander head (SLAC)
Z-Axis Vibration Test
– Low-level Signature Sine Sweep to 150 Hz (sweep up and down)
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Set-up sheet printouts (NRL), verification and approval (SLAC)
If LPT results are okay, disconnect EGSE cables
Run test
Output FRF data (NRL)
Review Data (SLAC)
– Determine notching, if needed
– Provide feedback to test conductor
– Check pass/fail criteria for Modal Test requirement
Give OK to proceed (SLAC), or decide alternate action is needed
Half-level run to 50 Hz
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Set-up sheet printouts (NRL), verification and approval (SLAC)
Run test
Output data hardcopies (NRL)
Review Data (SLAC)
– Check notching and adjust, if needed
– Provide feedback to test conductor
Give OK to proceed (SLAC), or decide alternate action is needed
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test Planning: Detailed Sequence (cont.)
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Z-Axis Vibration Test (continued)
– Full-level run to 50 Hz
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Low-level Signature Sine Sweep to 150 Hz
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Set-up sheet printouts (NRL), verification and approval (SLAC)
Run test
Output data hardcopies (NRL)
Review Data (SLAC)
– Check peak levels
– Check pass/fail criteria for Modal Test requirement
Give OK to proceed (SLAC), or decide alternate action is needed
Set-up sheet printouts (NRL), verification and approval (SLAC)
Run test
Output data overlays (NRL)
Review Data (SLAC)
– Re-Check pass/fail criteria for Modal Test requirement
Concurrent with data review, hook-up EGSE and perform LPT
If data review and LPT are good, Give OK to break configuration, or decide is alternate action is
needed
Post- Z-Test / Pre- X-Test Activities
– Disconnect all electrical connections
– Remove mounting bolts and move LAT from expander head and set on handling dolly
– Remove expander head, rotate shaker to horizontal position and attach drive bar to slip
table
– Lift LAT and TIP onto slip table for X-axis vibration and torque bolts
– Hook-up accelerometers only and perform vibration control system checkout (no EGSE
hook-up here)
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test Planning: Detailed Sequence (cont.)
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X-Axis Vibration Test
– Low-level Signature Sine Sweep to 150 Hz
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Half-level run to 50 Hz
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Full-level run to 50 Hz
X
Slip
Table
Low-level Signature Sine Sweep to 150 Hz
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Same steps as Z-axis test
Give OK to proceed (SLAC), or decide alternate action is needed
Shaker
Y
•
•
–
Same steps as Z-axis test
Give OK to proceed (SLAC), or decide alternate action is needed
LAT
–
Same steps as Z-axis test
Give OK to proceed (SLAC), or decide alternate action is needed
Same steps as Z-axis test
Concurrent with data review, hook-up EGSE and perform LPT
If data review and LPT are good, Give OK to break configuration, or decide is alternate action is
needed
Post- X-Test / Pre- Y-Test Activities
– Disconnect EGSE electrical connections, leaving Accel cables connected
– Remove mounting bolts, lift and rotate LAT in place
Shaker
– Lower LAT to slip table and torque bolts
– Perform vibration control system checkout (no EGSE hook-up here)
Y
Slip
X
Table LAT
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test Planning: Detailed Sequence (cont.)
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Y-Axis Vibration Test
– Low-level Signature Sine Sweep to 150 Hz
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Half-level run to 50 Hz
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•
–
Same steps as X-axis test
Give OK to proceed (SLAC), or decide alternate action is needed
Low-level Signature Sine Sweep to 150 Hz
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•
•
Same steps as X-axis test
Give OK to proceed (SLAC), or decide alternate action is needed
Full-level run to 50 Hz
•
•
–
Same steps as X-axis test
Give OK to proceed (SLAC), or decide alternate action is needed
Same steps as X-axis test
Concurrent with data review, hook-up EGSE and perform LPT
If data review and LPT are good, Give OK to break configuration, or decide is alternate action is
needed
Post- Y-Test Activities
– Disconnect all electrical connections
– Remove mounting bolts, lift and set LAT on handling dolly
– Attach LAT to handling dolly
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Configurations – Deviations From Flight
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The Radiators are not integrated to the LAT for this test.
– Structural interactions between the Radiators and the Grid are not captured
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Coverplates to constrain the down spout heat pipes (DSHPs) and X-LAT heat pipes
(XLHPs) to prevent relative motion to the Grid
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This interface will be strength verified at the subsystem level
This interface will be strength verified at the subsystem level
The LAT is mounted to STE using test flexures which simulate the flight connection to the SC
– The STE and test flexures will be included in the pre-test FEA analysis, so its impact on
the response of the LAT will be understood.
Since the Radiators and SC are not included in this test, not all flight cable harnesses and
supports will be integrated for this test
– These cables and their associated support brackets will not be adequately verified by this
test
– Workmanship for these flight connections and harnesses will be accomplished with the
Observatory level sine vibration test.
LAT Environmental Test PDR
25
GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Document List and Status
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LAT-MD-00408: LAT Instrument Performance Verification Plan
LAT-MD-02717: LAT Environmental Test Sequence
LAT-MD-01196: LAT Dynamics Test Plan
LAT-MD-01533: LAT EGSE Plan
LAT-MD-00649: LAT Transportation and Handling Plan
LAT-MD-00404: LAT Contamination Control Plan
LAT-SS-00778: LAT Environmental Spec
LAT-TD-00890: LAT Instrumentation Plan
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Logistics
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Test Personnel
– Test support personnel have been identified (to be verified)
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Test Director: John Ku (SLAC)
Test Conductor: Bob Haynes (NRL)
Discipline Lead: Jim Haughton (NRL)
Facility Manager:Bill Raynor (NRL)
MGSE Lead: Martin Nordby (SLAC)
EGSE Lead: Mike Huffer (SLAC)
Test Script Lead: Rich Baun (SLAC)
High-bay operations: Paul Dizon (NRL)
Quality Assurance: Joe Cullinan (or Doug Bartholomew) (SLAC)
I&T: Ken Fouts (SLAC)
– Subcommittees will be assembled from the appropriate personnel above, with
expert consultation brought in if needed
• Potential Vibration Experts: Paul Baird; Chris Fransen; Bill Haile
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Test Logistics
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Many logistics have already been worked out; these remain:
– Complete and release drawings/model of slip table and expander head
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•
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Identify what contamination and humidity control is needed in vibe facility
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Verify slip table and expander head size, inserts and pattern
Clearance to off-load frame on expander head
Verify that Test Interface Plate fits completely on expander head
Verify that LAT clears bracket parts on slip table
Develop paper doll work-up to verify we have floor space for 2 carts, GPR, and 4x4 Lift Fixture
Lay out EGSE cable routing and locate EGSE crates
Is GN2 purge neccesary?
Cleanliness (need blanket?)
– CG Alignment / sensitivity of equipment to offsets (by analysis TBD)
– Instrumentation patch panels and cable supports (ensure all connectors interfaces)
– Complete detailed design and analysis of TIP and flexure mount brackets (In-process)
– Verify response / control channel capability (NRL)
Contingencies
– Need to be prepared to perform a modal test if the LAT frequencies do not meet
expectations
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•
•
Modal test will not need additional instrumentation
May require the use of portable shaker with stinger to RMB or other hardpoint
Impact to schedule is not believed to be more than one day of testing (but rigorous post test data
reduction will be needed)
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Sine Vibration Test – Open Issues
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Complete structural analysis of MSGE
Complete pre-test analysis, including a simulation of LAT on fixtures
10 action items are open and being tracked.
– 9 have clear closure paths and are actively being worked on
– 1 action not addressed yet is not a high priority, as MGSE has not been designed yet
Dynamics Test Action Item List
Test Director: John Ku
Acoustic, Vibe, Mass Properties
Total Actions: 32
ID
Test
Action Item
Actionee
V100 VIBE Add strain Gages on S/C flexures. Additional instrumentation for John Ku
box level qual.
Updated:
Printed:
Open Actions:
1
ECD
Status
1/2/2005
Open*
2/15/2005
3/25/2005
2/28/2005
Open*
V102
VIBE Provide CAD file of vibe table: size and bolt pattern for slip table Paul Dizon
and expander head.
V108
VIBE Muon survey, electrical function, dimensional inspection after
each axis to determine if there is a performance change?
Pat Hascall
Rich Baun
V112
VIBE Determine criteria by which modal survey decision is made
during/after sine vibe
VIBE Generate CAD layout of vibe facililty, incl room, entrance, crane,
tables
VIBE Work out specifics of integrating LAT on flexures and vibe
adapter plate, plus transporting with it on
VIBE Identify cooling needed for vibe LPT's, and whether Chill Bars
can stay attached to wings
VIBE Identify cleanliness req's for LAT during vibe, since lab is not a
clean room
John Ku
11/30/2004
12/17/2004
2/28/05
7/15/2005
Paul Dizon
3/7/2005
Martin Nordby
3/15/2005
John Ku
Martin Nordby
Martin Nordby
3/15/2005
V118
VIBE Work through vibing a pressurized component with NRL safety
7/15/2005
V120
VIBE Send updated floor layout of sine vibe lab as well as an overall
layout showing relative layout of different labs
John Ku
Marc Campell
Bob Haynes
Bill Raynor / Paul
Dizon
V114
V115
V116
V117
LAT Environmental Test PDR
4/15/2005
3/25/2005
18-Feb-05
3-May-05
Status Comments/Disposition/Conclusions
Added extra accel's to Instr Plan. Strain Gauge locations
defined. Need to add strain gauges to Instr Plan.
Old ID
ET2-23
Will be redrawn at NRL and provided to SLAC. An
ET 2-4
unreleased draft has been provided, but need drawing to be
signed off.
Open* Rich Baun is working on it. Cooling bars have been sized to ET2-37
support these performance tests.
Open* 2/15: opened at Plan Mtg. Criteria will be known after pretest analysis is completed
Open* 2/15: opened at Plan Mtg. First cut 2d drawing sent out.
Need to send out final drawings
Open* 2/15: opened at Plan Mtg. Cf V110
Open* 2/15: opened at Plan Mtg. This is intimately tied to the LPT
requirements. Concept in-work.
Open* 2/15: opened at Plan Mtg. Not clear we need anything yet,
but the provision for tent is there. Martin is working on this
requirement
Open 2/15: opened at Plan Mtg. HP's are pressurized
components: How much gas is in each HP and what is the
pressure level?
Open* 3/14: Plan Mtg at NRL
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GLAST LAT Project
3-4 May 2005
Acoustic Test – Test Plan Overview
•
•
Objectives of the test are well understood by all
– The objective of the acoustic test is to demonstrate that the fully integrated LAT is
capable of withstanding acoustic noise loads, simulating launch conditions.
– A secondary objective is to verify the acoustic analysis, i.e. that the LAT components
were qualified to high enough levels of Random vibration
Test Plan
– Third draft of test plan is out for review – first major update in over a year
– Many technical details have been addressed in previous meetings – the current draft is
very mature and should be released in 1-2 weeks
•
–
First comments in from GSFC mechanical branch have been minor and already incorporated
Instrumentation list is nearing completion, but not finished yet
•
•
•
Internal accelerometers defined and CAD layout complete
Strain gauges (16 channels) on flexures defined (NRL can accommodate up to 40 channels, ¼
bridge)
External accelerometer mathematical positions defined, but CAD layout needed
LAT Environmental Test PDR
30
GLAST LAT Project
3-4 May 2005
Acoustic Test – Test Plan Overview
•
Test Plan (Continued)
– Entrance/Exit Criteria are well understood by all; from the test plan:
•
•
The LAT acoustic test is performed immediately following the LAT sine vibe test. Criteria which
must be met before this test can be executed are:
– LAT mechanical integration is complete—all visual, dimensional, and torque testing has
been complete, and all travelers verified to be complete. The LAT is in its flight
configuration, except as detailed in Section 10.3.
– All subsystem units/modules function—each subsystem has passed its CPT following
removal from the shipping container. Any performance discrepancies have been clearly
documented.
– Ensure all E-GSE needed is installed and functioning. After moving and attaching the LAT
to the vibration test equipment, ensure each subsystem has passed its LPT. All E-GSE
cable harnesses have been removed from the LAT prior to test.
– All test instrumentation is in place and functioning—instrumentation has been verified to be
securely mounted in the correct locations and oriented in the correct direction, as defined
in the test procedure, and electronics are working correctly, and reading out signals. Cable
harnesses for this instrumentation are connected and properly restrained for the test.
Following the acoustic test, an LPT will be performed. The criteria for declaring a successful
completion of the acoustic test are::
– Visual inspection of the LAT—indicating that there is no visible damage to the LAT
– Successful completion of the LPT—verifying that all components and subsystems function
properly after testing
– Preliminary analysis of test data—verify that all recorded data is useable for analysis
purposes
– No significant mode shifts—pre- and post-test signatures match within 5% showing modal
frequencies have not changed as a result of testing
LAT Environmental Test PDR
31
GLAST LAT Project
3-4 May 2005
Acoustic Test – Test Plan – Requirements
Test Requirements
–
Instrument Verification Plan
•
•
The tests will be performed to the
levels published in the LAT
environmental specification
document, LAT-SS-00778
The dynamics tests are to be
performed in the mode in which
the equipment will observe the
environment
– LAT will be launched in a
“powered off” mode
– The acoustic test will be
performed with the article
powered off
LAT Environmental Test PDR
Freq
(Hz)*
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
OASPL
Accept
Test
(dB)
124.4
127.3
131.2
132.1
134.4
131.9
130.6
128.6
129.4
126.6
123.4
119.9
119.1
116.6
117.5
117.2
118.4
119
117
117.3
115.6
113
108.9
104.9
101.8
99.8
140.8
Qual
Test
(dB)
127.4
130.3
134.2
135.1
137.4
134.9
133.6
131.6
132.4
129.6
126.4
122.9
122.1
119.6
120.5
120.2
121.4
122
120
120.3
118.6
116
111.9
107.9
104.8
102.8
143.8
150
Acoustic Loading
145
Sound Pressure Level (dB)
•
140
135
130
125
120
115
110
Accept Test (dB)
105
Qual Test (dB)
100
10
100
1000
10000
Frequency (Hz)
(*) One-third octave center frequency
Protoflight Levels = Qualification Levels
T est Duration = 60 seconds for acceptance and protoflight tests
T est Duration = 120 seconds for qualification (prototype) tests
32
GLAST LAT Project
3-4 May 2005
MGSE/STE for Acoustic Testing
•
•
LAT (on the TIP) is mounted on the Test
Stand for acoustic testing
– LAT + TIP mounts to Test Stand then
Radiators are integrated
– LAT is rolled into the acoustic
chamber, then jacked off its casters
– Dust Tent remains over the LAT for
the entire operation, including
during testing (TBR)
SC top deck simulator
– A circular honeycomb-core panel is
mounted in the hole of the TIP
– This simulates the acoustic behavior
of the SC top deck
– There is free access to the underside
of the TIP through the Test Stand to
integrate and instrument this
Test
Interface
Plate
LAT
Radiator
SC Strut
simulators
Test Stand
Radiator
Acoustic Test Configuration
LAT Environmental Test PDR
33
GLAST LAT Project
3-4 May 2005
MGSE Requirements Flowing from Acoustic Test Plans
•
•
•
•
•
See the table, below, for a list of all MGSE/STE that is needed for conducting the acoustic test
Test Interface Plate
– TIP accommodates a top deck acoustic simulator
– Top deck acoustic simulator adequately simulates the acoustic behavior of the SC
Dust Tent
– Capable of providing clean, dry environment before/during/after acoustic testing
– Provides clearance around LAT
– Does not impact the acoustic response of the LAT or acoustic environment in the
chamber during testing
SC Strut Simulators
– Provides flight-like interface to simulate SC struts that support the Radiators
– Interface with Radiator at flight interface, and with Test Stand
Chill Bars
– Capable of handling acoustic loads (obviates need to de-/re-integrate them)
MGSE Assembly
Test Interface Plate Ass'y
Test Stand
SC Top Deck Acoustic Sim
SC Strut Sim's
Dust Tent
Chill Bars and Aux. Cooling
Use / Comments
Mounts LAT to slip table/expander head
Use with casters/jacks to move into chamber
Simulates SC top deck acoustic response
Simulates SC support struts for Radiators
Covers LAT in un-regulated environment
Cool LAT for pre-/post-test LPT's
MGSE/STE Needed for Acoustic Testing
LAT Environmental Test PDR
34
GLAST LAT Project
3-4 May 2005
Auxiliary Cooling and Mechanical Handling
•
Auxiliary cooling plans
– LAT needs to be cooled during LPT’s before and after acoustic testing
•
•
Chill Bars: one under each of the two X-wings on the Grid
X-LAT Aux Cooling: using fly-away cooling lines already mounted to X-LAT Plate
–
–
•
This is room-temperature cooling to remove LAT process heat
To simplify cooling connections, Chill Bars and X-LAT cooling will be designed to handle
acoustic loads
– We may be able to leave all hoses and fittings connected during the test (TBR), otherwise
will quick-disconnect them
Handling and mechanical operating procedures
– LAT lifting procedure
– Radiator integration procedure
– Test Stand handling and operating procedure
– Dust tent handling and operating procedure
– LAT auxiliary cooling system operating procedure
LAT Environmental Test PDR
35
GLAST LAT Project
3-4 May 2005
MGSE Issues for Acoustic Testing
•
•
Dust Tent
– This is likely needed for acoustic testing, but is still TBR
– If needed, what is impact of dust tent on acoustic environment in the chamber?
– Dust tent will need to be designed to not overly-attenuate sound pressure levels
Transportation issues
– The acoustic chamber has a ¾” door sill/threshold
•
•
–
We plan to build a ramp to roll up and over the sill
This will definitely by prototyped with the pathfinder, since the LAT c.g. is moderately high
Test Stand will be moved into the room with an electric forklift
•
We need to verify that it can position the LAT adequately
LAT Environmental Test PDR
36
GLAST LAT Project
3-4 May 2005
Acoustic Test – Test Plan – Constraints
–
EGSE Constraints
•
•
Cables
– Disconnected during vibration
– Must be long enough to reach LAT while mounted to either expander head or slip table
– Cable trays or protection if laid on floor
Cart with EGSE Hardware
– Portable, can be rolled out of the way
– Power interface to lab?
LAT Environmental Test PDR
37
GLAST LAT Project
3-4 May 2005
Acoustic Test – Test Configuration
•
Mechanical Configuration
– Radiators attached (with flight thermal joint)
•
–
Mounted to GD/Spectrum Astro-provided test flexures
•
•
–
–
–
•
Need to ensure thermal joint has enough time to cure (7 days RT)
Test flexures will be proof tested at SLAC prior to GRID static test
Mounted on LAT acoustic test stand
LAT Z-axis is vertical
Access to connectors needed (ladder around MGSE) on +X side
Layout needed to check cable run lengths
Electrical Configuration
– SLAC purchased accelerometers are voltage type and have 10-32 connectors, with a
special proprietary triax connector
•
•
–
–
Adapters will be needed to interface with NRL equipment
ACD accelerometer interface to be verified
Strain gauges do not have connectors (open leads)
EGSE needed for LPTs between axes (Rich Baun to define requirements)
LAT Environmental Test PDR
38
GLAST LAT Project
3-4 May 2005
Acoustic Test – Test Configuration – Instrumentation
•
Test instrumentation by subsystem, total of 57 channels, calibrated and installed by SLAC I&T,
final checkout by NRL
Anti-Coincidence Detector
10 Accel Channels
10 Uni (9 Fly-away)
0 Tri (0 Fly-away)
Trackers
7 Accel Channels
7 Uni (7 Fly-away)
0 Tri (0 Fly-away)
Calorimeters
6 Accel Channels
0 Uni (0 Fly-away)
2 Tri (2 Fly-away)
Electronic Boxes
9 Accel Channels
5 Uni (3 Fly-away)
2 Tri (2 Fly-away)
Mechanical Systems
25 Accel Channels
1 Uni (1 Fly-away)
8 Tri (0 Fly-away)
902227
Y
902264
LAT Environmental Test PDR
Y
X
904433
Y
39
GLAST LAT Project
3-4 May 2005
Acoustic Test – Test Configuration – Instrumentation
•
Acoustic
Chamber
•
M2, ACD
Mid-pnl
The STE will be centered in the acoustic chamber,
rotated to an angle of approximately 20-30 degrees,
as measured between the Radiator surface and
chamber sidewall
Additionally, there will be a plastic sheet placed
under the STE to help identify any items that may
come loose as a result of the acoustic vibration.
~36”
M1, ACD
Mid-pnl
M5, RAD
Mid-pnl
M3, ACD
Mid-pnl
M6, RAD
Mid-pnl
M4, ACD
Mid-pnl
M7,
monitor
only
LAT Environmental Test PDR
40
GLAST LAT Project
3-4 May 2005
Acoustic Test Planning: Detailed Sequence
•
Pre-test Activities
– Chamber Setup and empty cell calibration
•
•
–
–
Move LAT on dolly (radiators already installed) into chamber and set orientation to the
appropriate angle
Cable Hook-ups and system checkouts
•
•
•
This is needed to verify the test cell is clean and ready to accept the LAT for testing
The empty cell calibration will verify that the specified sound pressure levels can be achieved
Electrical connections to shaker system and accel tap checks (NRL)
Electrical connections to EGSE and perform LPT on expander head (SLAC)
– LPT on acoustic test stand
Low-Level run at -6 dB for 30 seconds (establish pre-test signature, review data)
– Set-up sheet printouts (NRL), verification and approval (SLAC)
– If LPT results okay, disconnect EGSE cables and close chamber door
– Purge chamber of air
– Run Test
– Output Data, accel ASD’s and strain gauge SSD’s (NRL)
– Review data (SLAC)
•
•
•
–
Check for “dead” channels
Review mic average for level and chamber uniformity
Review Grms values for obvious anomalies
Give Okay to proceeed (SLAC), or decide if alternate action is needed
LAT Environmental Test PDR
41
GLAST LAT Project
3-4 May 2005
Acoustic Test Planning: Detailed Sequence (cont.)
•
Full-Level run at -0 dB for 60 seconds (impart full SPL, check SPL, linearity, review data)
– Set-up sheet printouts (NRL), verification and approval (SLAC)
– Run Full level Test
•
•
–
Immediately following full level run, perform low level run
•
–
–
Do not review data between full level and post-test low level run
Output Data accel ASD’s and strain gauge SSD’s (NRL)
Review data (SLAC)
•
•
•
–
As level steps up to -3dB, check critical channel linearity and record data
Hold at full level for 60 seconds
Check for “dead” channels
Review mic average that PFQ level is met and chamber uniformity
Review Grms values for linearity
Give Okay to proceeed (SLAC), or decide if alternate action is needed
LAT Environmental Test PDR
42
GLAST LAT Project
3-4 May 2005
Acoustic Test Planning: Detailed Sequence (cont.)
•
Low-Level run at -6 dB for 30 seconds (Signature check, review data, complete axis)
– Output Data (NRL)
– Review data (SLAC)
•
•
•
•
Check for “dead” channels
Review mic average for level and chamber uniformity
Review pre- and post- test overlays for frequency shifts and amplitude changes
– Give Okay to proceeed (SLAC), or decide if alternate action is needed
Post- Acoustic Test Activities
– Fill chamber with air (may be done automatically following final low-level run)
– Connect EGSE and perform LPT
– Visually inspect plastic sheet under LAT
– If everything looks okay, give okay to break configuration
– Disconnect all electrical connections
– Move LAT out of chamber
LAT Environmental Test PDR
43
GLAST LAT Project
3-4 May 2005
Acoustic Test – Configurations – Deviations From Flight
•
The LAT is mounted to STE, which is intended to simulate the influence of the SC volume and
geometric proximity on acoustic pressures immediately adjacent to significant LAT surfaces,
such as the Radiators and XLAT plate
– The SC top deck and lower radiator strut mounts were identified as the critical regions for
SC simulation
•
•
•
The top deck simulator will be of the same construction as the SC top deck and will be attached to
the TIP MGSE
The lower radiator strut mounts will have a similar interface with the radiators and the stiffnesses
will be approximated, but cross-coupling and stiffness differences will not be captured in this test
SC-LAT cabling is not connected for this test, so these connections, the cable harnesses, and
the attachment methods are not verified as part of this test
– These will be verified at the Observatory acoustic test
LAT Environmental Test PDR
44
GLAST LAT Project
3-4 May 2005
Acoustic Test – Document List and Status
•
•
•
•
•
•
•
•
LAT-MD-00408: LAT Instrument Performance Verification Plan
LAT-MD-02717: LAT Environmental Test Sequence
LAT-MD-01196: LAT Dynamics Test Plan
LAT-MD-01533: LAT EGSE Plan
LAT-MD-00649: LAT Transportation and Handling Plan
LAT-MD-00404: LAT Contamination Control Plan
LAT-SS-00778: LAT Environmental Spec
LAT-TD-00890: LAT Instrumentation Plan
LAT Environmental Test PDR
45
GLAST LAT Project
3-4 May 2005
Acoustic Test – Test Logistics
•
Test Personnel
– Test support personnel have been identified (to be verified)
•
•
•
•
•
•
•
•
•
•
Test Director: John Ku (SLAC)
Test Conductor: Bob Haynes (NRL)
Discipline Lead: Jim Haughton (NRL)
Facility Manager:Bill Raynor (NRL)
MGSE Lead: Martin Nordby (SLAC)
EGSE Lead: Mike Huffer (SLAC)
Test Script Lead: Rich Baun (SLAC)
High-bay operations: Paul Dizon (NRL)
Quality Assurance: Joe Cullinan (or Doug Bartholomew) (SLAC)
I&T: Ken Fouts (SLAC)
– Subcommittees will be assembled from the appropriate personnel above, with
expert consultation brought in if needed
• Potential Vibration Experts: Paul Baird; Chris Fransen; Bill Haile
LAT Environmental Test PDR
46
GLAST LAT Project
3-4 May 2005
Acoustic Test – Open Issues
•
Many logistics have been closed already; the logistics that still need consideration are:
– Lip at threshold (how to transport into room)
•
•
Accommodation for moving Test Stand over ½” door sill
Use pneumatic wheels or air bearings?
– Cleanliness (need blanket?) – is rating worse than 100K?
– Instrumentation feedthrough and cable supports
– Is a dust tent needed around LAT in acoustic chamber
– What type of panels are needed in/around LAT to simulate SC response
Complete structural analysis of MSGE
Complete pre-test analysis
– Verify top plate simulator attached to TIP MGSE adequately replicates SC response
5 action items are open and being tracked.
– All actions have clear closure paths and are actively being worked on
•
•
•
Dynamics Test Action Item List
Test Director: John Ku
Acoustic, Vibe, Mass Properties
Total Actions: 14
ID
Test
Action Item
A109 ACST How to bag the LAT during acoustic test to maintain cleanliness
(especially wrt contacting Radiator FOSR)
A110 ACST How to get over 1/2" door sill of acoustic chamber
Actionee
Martin Nordby
Martin Nordby
A111
ACST Deliver acoustic chamber CAD model with door, etc
Paul Dizon
A112
ACST Check cable length, since connection to facility cables is
through a penetration and outside the chamber (check if NRL
has cables available)
ACST Ensure enough cure time for radiator thermal joint (7 day RT
cure)
John Ku
Rich Bielawski
A113
LAT Environmental Test PDR
Marc Campell
Updated: 18-Feb-05
Printed: 3-May-05
Open Actions:
0
Status Comments/Disposition/Conclusions
ECD
Status
4/15/2005
Open* 2/15: opened at Plan Mtg; Often, instruments are bagged in
ESD bagging, which sits on a light-weight frame
4/15/2005
Open* 2/15: opened at Plan Mtg. Agreement made to use wheels
and not air bearings. Details TBD
3/7/2005
Open* 2/15: opened at Plan Mtg. First cut 2d drawing sent out.
4/15/2005
Need to send out final drawings
4/15/2005
Open* 2/15: opened at Plan Mtg. Being worked.
4/15/2005
Old ID
Open* 3/14: Plan Mtg at NRL. Most likely will have Radiators
present for EMI, which would provide the 7 day cure before
acoustic. However, this has not been finalized yet. If there
are no Radiators for EMI, there would be a 7 day delay
before the acoustic te
47
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Test Plan Overview
•
Objectives
– The primary objective of this test is to measure and/or calculate the overall mass and CG
of the fully integrated LAT, to verify that it meets the IRD [433-IRD-0001] requirements of:
•
•
•
–
A secondary objective is to verify measured mass properties match well when compared
with the math model mass matrix.
•
•
•
Mass is less than 3000 kg
Z-cg is a maximum of 185mm above the LAT Interface Plane (LIP)
– Because of the difficult involved in measuring Zcg, this requirement will be verified through
calculations, based on measurements of all LAT constituents.
– From the Xcg and Ycg measurements and comparison with calculated values, an
appropriate confidence level can be established and applied to the Zcg calculations.
X-cg and Y-cg are within 20mm of LAT Coordinate System (LCS) Z-axis
Due to the complexity of measuring moments of inertia, only mass and CG properties will be
validated. Differences will be reconciled by updating the math model to reflect measured values
Since structural dynamics is intimately tied with mass and stiffness, mass property updates are
important to preserve the true dynamic behavior of the LAT.
Test Plan
– This is a new addition to the test plan draft 3
– Many technical details have been addressed in previous meetings – the current draft is
very mature and should be released in 1-2 weeks
– All needed instrumentation has been identified, but MGSE design is still needed
LAT Environmental Test PDR
48
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Test Plan Overview
•
Test Plan (Continued)
– Entrance/Exit Criteria; from the test plan:
•
•
The LAT mass properties test is performed following the LAT thermal vacuum test and the
subsequent CPT and removal of the radiators. Criteria which must be met before this test can be
executed are:
– LAT Radiators have been removed and the LAT, Flexures and TIP have been moved into the
mass properties test area—visual inspection verifies that all the LAT has been re-configured
correctly. All travelers verified to be complete. The LAT is in its flight configuration, except
as detailed in Section 10.3, below.
– All subsystem units/modules function—each subsystem has passed its CPT following
TVAC. Any performance discrepancies have been clearly documented.
– All non-fly-away accelerometers and other test instrumentation, cables and harnesses are
removed.
Following the mass properties test, an aliveness will be performed. The criteria for declaring a
successful completion of the mass properties test are:
– Visual inspection of the LAT—indicating that there is no visible damage to the LAT
– Successful completion of the aliveness test—verifying that all components and subsystems
are still properly interconnected.
– Preliminary analysis of test data—verify that all recorded data is useable for analysis
purposes
LAT Environmental Test PDR
49
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Test Plan – Constraints
–
MGSE Constraints
•
–
Platform to distribute weight into three load cells
– Must be stiff enough to carry load from TIP (four points) to load cells (three points), i.e. to
evenly distribute load from the four flexures
– Must be light enough to not affect load cell accuracy (use load cells with highest possible
accuracy and precision; load cell precision generally goes down with increased capacity)
– Must have a way to precicely locate the LAT and TIP with respect to some arbitrary
reference coordinate system
– Must be able to accommodate the LAT in 0 and 90 degree orientations
EGSE Constraints
•
•
Cables
– Disconnected during vibration
Cart with EGSE Hardware
– Portable, can be rolled out of the way
– Power interface to lab?
LAT Environmental Test PDR
50
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Test Configuration
•
Mechanical Configuration
– Radiators not attached
•
–
Mounted to GD/Spectrum Astro-provided test flexures
•
•
•
MGSE to hold DSHP and XLHP attached
Test flexures will be proof tested at SLAC prior to GRID static test
TIP to interface test flexures and weight and CG test platform
– LAT Z-axis is always vertical
– All unnecessary instrumentation removed (such as removable accels)
Electrical Configuration
– No electrical connections to the LAT
– 16 Strain gauges and 3 load cells are the only instrumentation needed
– EGSE needed to verify “aliveness” after weight and CG test
LAT Environmental Test PDR
51
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Test Configuration – Instrumentation
•
Test instrumentation by intrument type; Load cells installed by NRL; Strain gauges installed
by SLAC I&T
Load Cells
3 Channels
3310 lbf peak
15 lbf resolution
Strain Gauges
16 Channels
350 ue peak
6 ue resolution
F1
Wtot=F1+F2+F3
Xcg= (F2-F3)*a/Wtot
h
Ycg= F1*h/Wtot
LATcg
y
F2
x
a
LAT Environmental Test PDR
F3
a
52
GLAST LAT Project
3-4 May 2005
Weight and CG Test Planning: Detailed Sequence
•
Weight and CG Run
– Instrumentation check—use dummy masses to verify that all instrumentation is
operational and taking useful data
– Align LAT on test platform
– Measure overall mass and centers of gravity
– Rotate LAT 90 degrees and align to test platform
– Measure overall mass and centers of gravity
– Aliveness Test—execute aliveness test after LAT has been packed in shipping container
LAT Environmental Test PDR
53
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Configurations – Deviations From Flight
•
•
•
•
The LAT is mounted to STE (flexures and TIP), which is not part of the flight LAT structure.
Radiators not attached
– Radiator mass will be added to the LAT math model
MGSE to hold DSHP and XLHP attached
– The added weight will be subtracted from the LAT math model
– The added weight is insignificant and within the measurement precision of the load cells
SC-LAT connector savers are attached during this test
– The added weight will be subtracted from the LAT math model
– The added weight is insignificant and within the measurement precision of the load cells
LAT Environmental Test PDR
54
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Document List and Status
•
•
•
•
•
•
•
•
LAT-MD-00408: LAT Instrument Performance Verification Plan
LAT-MD-02717: LAT Environmental Test Sequence
LAT-MD-01196: LAT Dynamics Test Plan
LAT-MD-01533: LAT EGSE Plan
LAT-MD-00649: LAT Transportation and Handling Plan
LAT-MD-00404: LAT Contamination Control Plan
LAT-SS-00778: LAT Environmental Spec
LAT-TD-00890: LAT Instrumentation Plan
LAT Environmental Test PDR
55
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Test Logistics
•
Test Personnel
– Test support personnel have been identified (to be verified)
•
•
•
•
•
•
•
•
•
•
Test Director: John Ku (SLAC)
Test Conductor: Bob Haynes (NRL)
Discipline Lead: Jim Haughton (NRL)
Facility Manager:Bill Raynor (NRL)
MGSE Lead: Martin Nordby (SLAC)
EGSE Lead: Mike Huffer (SLAC)
Test Script Lead: Rich Baun (SLAC)
High-bay operations: Paul Dizon (NRL)
Quality Assurance: Joe Cullinan (or Doug Bartholomew) (SLAC)
I&T: Ken Fouts (SLAC)
– Subcommittees will be assembled from the appropriate personnel above, with
expert consultation brought in if needed
• Potential Vibration Experts: Paul Baird; Chris Fransen; Bill Haile
LAT Environmental Test PDR
56
GLAST LAT Project
3-4 May 2005
Weight and CG Test – Test Logistics
•
Many logistics have been worked out already; the remaining logistical issues are:
– Where to perform this test
– How to precisely align the LAT with respect to the load cells
– Finalize load cell selection
•
•
•
Ensure load cells availability
Ensure load cells meet precision requirements
Provide load cell ICD to SLAC for MGSE design
•
Other work to be performed
– Design the weight and CG Test platform to the requirements
– Perform structural analysis of MGSE and test platform
•
A/I Closure plans
– Currently NO OPEN ACTION ITEMS!!!
LAT Environmental Test PDR
57