GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Introduction  8:30 – 8:45
• Morning Planning Meeting  8:45 – 12:00
– Sine Vibration Test Planning Meeting  8:45 – 10:15
– Acoustic Test Planning Meeting  10:30 – 12:00
• Lunch  12:00 – 1:00
• Facility Tour  1:00 – 3:15
– Acoustic Test Planning  1:00 – 1:45
– Sine Vibration Test Planning  1:45 – 2:45
– Mass Properties Planning  2:45 – 3:15
• Afternoon Planning Meeting  3:30 – 5:30
– Mass Properties Summary  3:30 – 3:45
– Sine Vibration Summary  3:45 – 4:15
– Acoustic Test Summary  4:15 – 4:45
– Action Item Review  4:45 – 5:30
LAT-TD-00000-02 Page 1

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Sine Vibration Test Planning Meeting  8:45 – 12:00
– Action Item List Status (JK)  8:45 – 9:00
– Status of the Test Plan (JK)  9:00 – 9:15
– Detailed Test Sequence and Current Test Configuration (JK)  9:15 – 10:00
– Other Logistics (All)  10:00 – 10:15
• Break  10:15 – 10:30
• Acoustic Test Planning Meeting  10:30 – 12:00
– Action Item List Status (JK)  10:30 – 10:45
– Status of the Test Plan (JK)  10:45 – 11:00
– Detailed Test Sequence and Current Test Configuration (JK)  11:00 – 11:45
– Other Logistics (All)  11:45 – 12:00
LAT-TD-00000-02 Page 2

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
Dynamics Test Action Item List
Acoustic, Vibe, Mass Properties
Total Actions: 47
ID Test Action Item
V100 VIBE Add strain Gages on S/C flexures. Additional instrumentation for box level qual.
V101 VIBE Confirm working clearance to rotate the shaker. Add this working envelope to facility CAD layout
Bill Raynor
V102 VIBE Provide CAD file of vibe table: size and bolt pattern for slip table and expander head.
Actionee
John Ku
V103 VIBE Review of interfaces to identify peak loads at box interfaces that have not been tested compare to predictions. May need to update
John Ku the instrumention plan.
V104 VIBE Investigate data collection system at SLAC for accel. test during installation. Define instrumentation checkout process for I&T.
Paul Dizon
John Ku
Test Director: John Ku
Updated: 18-Feb-05
Printed: 18-Mar-05
Open Actions: 26
ECD Status Status Comments/Disposition/Conclusions
1/2/2005
2/15/2005
3/25/2005
3/15/2005
Open Added extra accel's to Instr Plan. Strain Gauge locations defined. Need to add strain gauges to Instr Plan.
2/28/2005
10/15/2004
11/1/2004
1/15/2005
4/15/2005
Closed Walk through at NRL meeting in mid-March. Determined that the LAT will have to be moved to second slip table when shaker is rotated from vertical to horizontal.
Open* Will be redrawn at NRL and provided to SLAC. An unreleased draft has been provided, but need drawing to be signed off.
Closed 12/6 Coordinated with drawing release schedule. 1/18/05
Closed to ET 2-23 with update of the instrumentation plan and vibe plan with current instrumentation. Provide NRL with current Instrumentation Plan from Leonard Lee.
Closed Three step verification recommended: 1) When accels arrive in-house, use a 1g hand-held shaker to verify sensitivity; 2) after installation, tap check for signal; 3) touch check to ensure position (touch check will isolate the accel)
V105 VIBE Can NRL table manage the change in the sweep rate for sine vibe Michael Lovellette 10/15/2004 Closed Yes the sweep rate be changed. Per e-mail from M. Lovellette
10/21/04
V106 VIBE Evaluate if .15g low level input is sufficiently above the noise floor or is higher input required.
Michael Lovellette 10/15/2004
12/15/2004
Closed NRL input is this is okay. NRL has gone lower with the old system. Per e-mail from M. Lovellette 10/21/04
V107 VIBE Calibration interval on accels Michael Lovellette 10/15/2004 Closed Incremental change is very slow. Low frequency excitation to determine functional. Per e-mail from M. Lovellette 10/21/04
V108
V109
V110
VIBE
VIBE
VIBE
Muon survey, electrical function, dimensional inspection after each axis to determine if there is a performance change?
Can we waive the slow sweep rate and pick it up at Observatory
Spacecraft interface definition from Spectrum Astro.
Pat Hascall
Paul Baird
11/30/2004
12/17/2004
2/28/05
10/8/2004
10/31/2004
Paul Baird
Mark Melton Tim
Morse
10/31/2004
4/1/2005
Open
Closed Not necessary because NRL can accommodate the sweep rate change. Decision was made to keep spectrum as is.
Open* Testing done at S/A in early December. Need S/C interface template for match drilling at SLAC in February. See Attached
Response from P. Baird 1/27/05. Need detailed info from SAI for drilling. Get LAT and Flexure placement procedure from
SAI.
LAT-TD-00000-02 Page 3

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
Dynamics Test Action Item List
Acoustic, Vibe, Mass Properties
Total Actions: 47
ID Test Action Item Actionee
Test Director: John Ku
Updated: 18-Feb-05
Printed: 18-Mar-05
Open Actions: 26
ECD Status Status Comments/Disposition/Conclusions
V111 VIBE Need to develop the plan for calibration of ACD accel already installed
V112 VIBE Determine criteria by which modal survey decision is made during/after sine vibe
Leonard Lee
John Ku
V113 VIBE Can harnesses stay mated during sine vibe to save mate/de-mate cycles?
Rich Bielawski
7/15/2005
4/15/2005
V114 VIBE Generate CAD layout of vibe facililty, incl room, entrance, crane, tables
Paul Dizon
V115 VIBE Work out specifics of integrating LAT on flexures and vibe adapter Martin Nordby plate, plus transporting with it on
V116 VIBE Identify cooling needed for vibe LPT's, and whether Chill Bars can stay attached to wings
V117 VIBE Identify cleanliness req's for LAT during vibe, since lab is not a clean room
V118 VIBE Work through vibing a pressurized component with NRL safety
John Ku
Martin Nordby
Martin Nordby
3/7/2005
3/15/2005
3/15/2005
4/15/2005
John Ku
Marc Campell
Bob Haynes
7/15/2005
Closed Will use Low level signature to check accel calibration
Open 2/15: opened at Plan Mtg. Criteria will be known after pre-test analysis is completed
Open 2/15: opened at Plan Mtg. Requirement if left on for vibe?
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
Open 2/15: opened at Plan Mtg. Not clear we need anything yet, but the provision for tent is there
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?
LAT-TD-00000-02 Page 4

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• 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 (f n
) 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
– Many technical details have been addressed in previous meeting, and just need to be collected and summarized – many of these points will be raised today, and agreements made will go directly into plan
– Instrumentation list is nearing completion, but not finished yet
• Internal accelerometers defined and CAD layout complete
•
External accelerometer mathematical positions defined, but CAD layout needed
•
Strain gauges (12 channels) on flexures expected, but not defined yet (NRL can accommodate up to 40 channels, ¼ bridge)
– Entrance/Exit criteria are well understood by all
•
No failure or damage to the LAT assembly as determined by physical inspection
• No significant changes to the dynamic signature as determined by the pre and post low-level sine vibration inputs
• No significant degradation of instrument or system performance
LAT-TD-00000-02 Page 5

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
–
• 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: Darren Marsh (or Doug Bartholomew) (SLAC)
• I&T: Ken Fouts (SLAC)
–
• Potential Vibration Experts: Paul Baird; Chris Fransen; Bill Haile
LAT-TD-00000-02 Page 6

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
–
• 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
–
• Cables
– If harnesses are heavy, they should be 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-TD-00000-02 Page 7

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Test Requirements
– MGSE Constraints
•
Test Interface Plate
–
Accommodates Spectrum-specified flexure mounting procedures
–
Should not have any modes less than 225 Hz (1.5 X 150 Hz)
–
Should be one order of magnitude stiffer than the flexures
– Mass should be small enough to not significantly impact Z-axis test
– Light enough to allow for using GPR to lift LAT+TIP within its current rated load (3000 kg)
– CG should be in-line with LAT and should position LAT CG through each drive axis
– Sufficient strength to carry all test loads with margin
– Interface with NRL slip table and expander head
• Cable support structures
– Should allow free motion of cables between vibration equipment and ground
– Should be grounded well to prevent tipping
–
Allow access to vibe equipment, connector panels, blankets and externally mounted accelerometers
• Test stand / handling dolly
– Should be grounded well to prevent rolling
– Should be located near shaker, and accessible by the vibe lab crane
• Radiator mass simulator needed?
• Contamination/environmental
• MGSE Concept being worked on at SLAC (Martin Nordby)
LAT-TD-00000-02 Page 8

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Known issues to be worked
LAT-TD-00000-02 Page 9

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
LAT appears to clear rotation of expander head
Test Interface Plate fits completely on expander head
Check on clearance to off-load frame
LAT on Expander Head
(with auxiliary support)
LAT on Shaker Table
LAT-TD-00000-02 Page 10

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
Check on total height of
4x4 Lift Fixture lifting
GPR over top of ACD
Check on clearance and access around underside of GPR
LAT-TD-00000-02
LAT on Expander Head
Showing GPR Lift with 4x4 Lift Fixture
Page 11

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Test Interface Plate
– Provides single interface for LAT in all test configurations
– Mimics SC top deck
– Ensures accurate alignment of SC flexures
Plate serves only to accurately position brackets, not to carry vibe loads
LAT-TD-00000-02
Test Interface Plate with SC Flexures
(on expander head)
Mount brackets transfer load from flexure directly to table
Test Interface Plate with SC Flexures
(on slip table)
Page 12

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
LAT-TD-00000-02 Page 13

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• 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
• 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)
•
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
• 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-TD-00000-02 Page 14

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Z-Axis Vibration Test (continued)
– Full-level run to 50 Hz
•
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
– Low-level Signature Sine Sweep to 150 Hz
•
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-TD-00000-02 Page 15

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• X-Axis Vibration Test
– Low-level Signature Sine Sweep to 150 Hz
•
Same steps as Z-axis test
•
Give OK to proceed (SLAC), or decide alternate action is needed
– Half-level run to 50 Hz
•
Same steps as Z-axis test
•
Give OK to proceed (SLAC), or decide alternate action is needed
– Full-level run to 50 Hz
Shaker
Slip
• Same steps as Z-axis test
•
Give OK to proceed (SLAC), or decide alternate action is needed
– Low-level Signature Sine Sweep to 150 Hz
Table
• 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)
Slip Y
X
Table
LAT
LAT-TD-00000-02 Page 16

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Y-Axis Vibration Test
– Low-level Signature Sine Sweep to 150 Hz
•
Same steps as X-axis test
•
Give OK to proceed (SLAC), or decide alternate action is needed
– Half-level run to 50 Hz
•
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
– Low-level Signature Sine Sweep to 150 Hz
• 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-TD-00000-02 Page 17

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Mechanical Configuration
– Radiators not attached
•
Are mass simulators required to represent load path from radiators?
• Currently no mass simulators are baselined
– Mounted to GD/Spectrum Astro-provided test flexures
•
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
– Voltage type accelerometers have BNC connectors to interface with NRL
– Strain gauges do not have connectors (open leads)
– EGSE needed for LPTs between axes (Rich Baun to define requirements)
• Procedures
– 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-TD-00000-02 Page 18

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
•
Many logistics can be discussed during the tour
– Any issues rotating shaker
–
Verify slip table and expander head size, inserts and pattern
– CG Alignment / sensitivity of equipment to offsets
– Instrumentation patch panels and cable supports
–
Floor space to set GPR and other GSE down
– Capability and benefit of using force gauges
– 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
–
Complete and release drawings/model of slip table and expander head
– Complete detailed design and analysis of TIP and flexure mount brackets
– Check on hook height in vibe room to ensure we can remove GPR when LAT is on expander head
– Develop paper doll work-up to verify we have floor space for 2 carts, GPR, and 4x4 Lift Fixture
– Develop requirements for Radiator simulator for sine vibe
–
Lay out EGSE cable routing and locate EGSE crates
– Identify what contamination and humidity control is needed in vibe facility
– Verify response / control channel capability
–
Is GN2 purge neccesary?
– Cleanliness (need blanket?)
•
Contingencies
– Need to be prepared to perform a modal test if the LAT frequencies do not meet expectations
• 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)
• A/I Closure plans
– Any action items unanswered by the end of the meeting will be tracked on a weekly basis
– Let’s take a 15 minute break
LAT-TD-00000-02 Page 19

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
Dynamics Test Action Item List
Acoustic, Vibe, Mass Properties
Total Actions: 48
ID Test Action Item
A100 ACST Acoustic test mid level run increase to 30 seconds
A101 ACST Evaluate supporting LAT at radiator mount brackets vs. SC flexures for acoustic test
A102 ACST Incorporate plan for a sheet under test article into LAT dynamic test plan.
A103 ACST Provide Microphone config to SLAC
Actionee
John Ku
Chris Fransen
John Ku
Test Director: John Ku
Updated: 18-Feb-05
Printed: 18-Mar-05
Open Actions: 25
ECD
10/8/2004
Status
Closed
Status Comments/Disposition/Conclusions
10/31/2004 Closed Overcome by events -- current baseline holds LAT by flexures
11/15/2004 Closed 12/6 Requirement incorporated into test plan.
A104 ACST Provide radiator support strut to SC interface stiffness.
A105 ACST Check boundary conditions on the S/C flexures for comparison to
SLAC model. New model to be delivered to SLAC.
Michael Lovellette
Paul Baird
Paul Baird
2/15/2005
10/15/2004
10/31/2004
4/15/2005
10/31/2004
4/15/2005
Closed Microphones are fully repositionable, and can be moved with tag lines at will
Open Deliver to John Ku 10/22. Per e-mail from P. Baird on
10/22/04
Open July drawing is most current. 3/8 fasteners. Flexure delivery late October.
Confirmed: "Each flexure mounts to an aluminum tube. There are nutplates inside the tube for the bolts. At each end of the flexure, there is one 1/4 inch
"tension" bolt (NAS1351) and two 3/8 inch "shoulder" bolts (NAS6706)."
A106 ACST Horiz or Vert orientation
A107 ACST Add contingency plans if accel signals are lost
John Ku
John Ku
2/15/2005
7/15/2005
A108 ACST Is low-level acoustic run needed between mid- and high-level runs to verify performance?
John Ku
Martin Nordby 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 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 John Ku penetration and outside the chamber (check if NRL has cables available)
Rich Bielawski
4/15/2005
4/15/2005
4/15/2005
3/7/2005
4/15/2005
4/15/2005
Closed 2/15: opened at Plan Mtg; OK to be horiz or vert, but if horiz
LAT needs to be 3 ft off ground
Open* 2/15: opened at Plan Mtg. John Ku thinks a 10% loss is acceptable, but will wait until the pre-test analysis to make the final decision
Closed 2/15: opened at Plan Mtg. Agreement made to omit this test, as well as omit the discrete -3dB run (monitor only)
Open 2/15: opened at Plan Mtg; Often, instruments are bagged in
ESD bagging, which sits on a light-weight frame
Open* 2/15: opened at Plan Mtg. Agreement made to use wheels and not air bearings. Details TBD
Open 2/15: opened at Plan Mtg
Open 2/15: opened at Plan Mtg.
LAT-TD-00000-02 Page 20

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• 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
– Many technical details have been addressed in previous meetings, and just need to be collected and summarized – many of these points will be raised today, and agreements made will go directly into plan
– Instrumentation list is nearing completion, but not finished yet
•
Internal accelerometers defined and CAD layout complete
•
External accelerometer mathematical positions defined, but CAD layout needed
•
Strain gauges (12 channels) on flexures expected, but not defined yet
– Entrance/Exit criteria are well understood by all
•
No failure or damage to the LAT assembly as determined by physical inspection
•
Inspection of plastic sheet under LAT does not produce any fibers, chips or fasteners
•
No significant changes to the dynamic signature as determined by the pre and post low-level acoustic vibration inputs
• No permanent deformations in the LAT structure or of any subsystem or component
• No significant degradation of instrument or system performance
LAT-TD-00000-02 Page 21

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• 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: Darren Marsh (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-TD-00000-02 Page 22

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• 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
– EGSE Constraints
• Cables
–
Must be long enough to reach LAT while mounted to test stand
•
Cart with EGSE Hardware
–
Portable, can be rolled into and out of the chamber, if needed
–
If cart is moved, does EGSE system need to be checked out again?
–
Power interface to lab?
LAT-TD-00000-02 Page 23

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Test Requirements
– MGSE Constraints
•
Test Interface Plate
–
Should be one order of magnitude stiffer than the flexures
–
Sufficient strength to carry all test loads with margin
–
Can serve as SC top plate simulator
• Cable support structures
– Should allow free motion of cables between vibration equipment and ground
– Should be grounded well to prevent tipping
– Allow access to connector panels, blankets and externally mounted accelerometers
• Test stand / handling dolly
– Must accommodate mounting of radiators, with lower strut supports simulated
– The LAT should be positioned such that the flat panels are a minimum of 15 ° from parallel to any of the test cell walls (45
° preferred)
–
Current strut design has rattle
– design to be flight-like?
– Radiator plane should be lined up with high flow (2000 cfm) woofer to prevent air foil effect
• Contamination: is tenting needed; humidity
• MGSE Concept being worked on at SLAC (Martin Nordby)
LAT-TD-00000-02 Page 24

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
This configuration is identical to
EMI Test configuration
Test Interface Plate mounts
LAT to Test Stand
Need to establish required height off ground —can be handled by a separate stand
LAT-TD-00000-02
LAT on Test Stand
(one Radiator removed
Facsimile SC struts support
Radiators with comparable stiffness
Page 25

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Pre-test Activities
– Chamber Setup and empty cell calibration
•
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
– Move LAT on dolly (radiators already installed) into chamber and secure dolly to chamber floor (orientation 45 ° TBD)
– Cable Hook-ups and system checkouts
• 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-TD-00000-02 Page 26

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• 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
• As level steps up to -3dB, check critical channel linearity and record data
•
Hold at full level for 60 seconds
– 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)
• 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
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GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• 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
– Disconnect dolly from floor and move LAT out of chamber
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GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Mechanical Configuration
– Radiators attached (with flight thermal joint)
•
Need to ensure thermal joint has enough time to cure (7 days RT)
– Mounted to GD/Spectrum Astro-provided test flexures
•
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 (temporary scaffold or ladder around MGSE) on +X side
– Layout needed to check cable run lengths
• Electrical Configuration
– Voltage type accelerometers have BNC connectors to interface with NRL
– Strain gauges do not have connectors (open leads)
– EGSE needed for LPTs before and after test (Rich Baun to define requirements)
• Procedures
– 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-TD-00000-02 Page 29

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Many logistics can be discussed during the tour
– Lip at threshold (how to transport into room)
– Mic placement / adjustability
– Cleanliness (need blanket?) – is rating worse than 100K?
– Height off ground (Chris Fransen believes current configuration should be okay, but need to check)
– Placement in room (note any obstructions)
– Note flow rate of pneumatic horns and possible currents in chamber
– Instrumentation feedthrough and cable supports
– Floor inserts to secure LAT
– Is a dust tent needed around LAT in acoustic chamber
– What type of panels are needed in/around LAT to simulate SC response
– Accommodation for moving Test Stand over ½” door sill
– How high does Radiator need to be off the floor: affects Test Stand spacer height
• A/I Closure plans
– Any action items unanswered by the end of the meeting will be tracked on a weekly basis
• Let’s take a lunch break and come back for the tour
LAT-TD-00000-02 Page 30

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Acoustic Test Planning  1:00 – 1:45
– Overview (BR)  1:00 – 1:10
– Run through test sequence described earlier (JK)  1:10 – 1:25
– Other things to discuss (All)  1:25 – 1:45
• Sine Vibration Test Planning  1:45 – 2:45
– Overview (BR)  1:45 – 1:55
– Run through test sequence described earlier (JK)  1:55 – 2:10
– Things to discuss (All)  2:10 – 2:30
– Control room (BR)  2:30 – 2:45
• Mass Properties Planning  2:45 – 3:15
– Overview (BR)  2:45 – 2:55
– Action Item List Status (JK)  2:55 – 3:00
– Run through test sequence (JK)  3:00 – 3:10
– Discuss capabilities of spin table and decide is MOI is needed (All)  3:10 – 3:15
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GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Mass Properties Planning  2:45 – 3:15
– Overview (BR)  2:45 – 2:55
– Action Item List Status (JK)  2:55 – 3:00
Dynamics Test Action Item List
Acoustic, Vibe, Mass Properties
Total Actions: 46
ID Test Action Item
M100 MASS Wt and cg measurement with or without Rad's
Actionee
John Ku
Test Director: John Ku
Updated: 18-Feb-05
Printed: 18-Mar-05
Open Actions: 34
ECD Status Status Comments/Disposition/Conclusions
Closed 2/15: opened at Plan Mtg. Measurement without Radiators agreed upon
– Run through test sequence (JK)  3:00 – 3:10
•
Remove non-flight instrumentation
• Move LAT and dolly into mass properties area
• Lift LAT onto MOI table and measure mass, Izz, and X cg
• Turn Dolly over to Z-horizontal configuration and Y cg
•
Attach three load cells beneath handling dolly and measure mass and Z-cg
• Turn dolly back to Z-vertical position
• Return LAT to Dolly
• Turn LAT and dolly over to Z-horizontal configuration
•
Measure combined mass and Z cg
– Discuss capabilities of spin table and MOI (pendulum) table and decide is MOI is needed
(All)  3:10 – 3:15
• Configuration
– LAT Mass properties may be a combination of measured and calculated properties
• Radiators off
• On LAT handling dolly for Z-axis measurement
LAT-TD-00000-02 Page 32

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Mass Properties Summary  3:30 – 3:45
– Agreements made today (JK)  3:30 – 3:35
– Items that still need to be worked out (All)  3:35 – 3:40
– Path to test (JK)  3:40 – 3:45
• Sine Vibration Summary  3:45 – 4:15
– Agreements made today (JK)  3:45 – 3:55
– Items that still need to be worked out (All)  3:55 – 4:05
– Path to test (JK)  4:05 – 4:15
• Acoustic Test Summary  4:15 – 4:45
– Agreements made today (JK)  4:15 – 4:25
– Items that still need to be worked out (All)  4:25 – 4:35
– Path to test (JK)  4:35 – 4:45
• Action Item Review 4:45 – 5:30
– Collect action items (JK)  4:45 – 5:00
– Read through action items (JK)  5:00 – 5:15
– Other? (All)  5:15 – 5:30
LAT-TD-00000-02 Page 33

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Agreements made today
– MOI & Spin table is not ideal for our needs
– Static CG and Mass measurement can be accomplished with load cells
• If we want a 2mm CG resolution, then a 15lbf load cell resolution is needed
•
Static LAT mass is up to 3000 kg (6614 lbf).
•
If three load cells are used, each load cell should be rated to 2205 lbf +/- 15lbf
• Items that still need to be worked out
– Check IRD & MAR for CG requirement
• Reqmt is <20mm for Xcg and Ycg
• Reqmt is <185mm above LIP
• Path to test
LAT-TD-00000-02 Page 34

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Agreements made today
– EGSE out of room if cables are long enough (desirement, not requirement)
– Verification of accels at SLAC using a 1g shaker before mounting, tap check and touch check after mounting
– Keep full level vibe spectrum as is (with changes in sweep rate)
– Low level sine sweep up and down
– NRL to provide accel hookup to LAT
– QA managed by SLAC (Darren Marsh), but staffed by SLAC and NRL
– Proof Test MGSE at SLAC
• Items that still need to be worked out
– Structural analysis of TIP and associated MGSE
– Is mass simulator for radiators needed
– Determine need for force gauges
– Simulate LAT on fixture to check for fixture modes
• Path to test
– Force gauge decision by 3/25
– Release test plan by 3/25
– Plan for Mid to late April PDR (with most A/I’s closed)
– Complete pretest analysis and release memo one month prior to test
LAT-TD-00000-02 Page 35

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Agreements made today
– No straps needed
– Radiators low to floor (3-5cm) is okay
– Line up radiator plane to main woofer output
– Omit mid-level run  just monitor and collect data
– Go from full level to low level immediately (no data review)
– Use wheels instead of air bearings  need to decide on pneumatic or solid tires
• Items that still need to be worked out
– Verify top plate adequately simulated with MGSE
• Path to test
– Release test plan by 3/25
– Complete pretest analysis and release memo one month prior to test
LAT-TD-00000-02 Page 36

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
Dynamics Test Action Item List Test Director: John Ku
ID
Acoustic, Vibe, Mass Properties
Total Actions: 46
Test Action Item Actionee
V119 VIBE Identify power drops and grounds on facility drawings
V120 VIBE Send updated floor layout of sine vibe lab as well as an overall layout showing relative layout of different labs
V121 VIBE GSFC to evaluate SC strut to radiator design (current design shows potential rattling…is this GD's intention?
Bill Raynor
Bill Raynor / Paul
Dizon
Paul Baird
V122 VIBE Provide effective stiffness of struts and SC bus so SLAC can design an appropriate support structure for acoustic testing
V123 VIBE Are mass sims needed to simulate radiators during vibe test?
V124 VIBE How are XLHPs and DSHPs supported when no VCHPs are
Paul Baird
John Ku
Martin Nordby present
V125 VIBE Provide detail of accelerometer electrical configuration including Martin Nordby
V126 VIBE
ACD cables, to ensure interface to NRL
Deliver Test-verified NASTRAN model of expander head Jim Haughton
V127 VIBE provide force gauge information (Kistler 9057?) and what inventory Bob Haynes
GSFC has. We will baseline 10K force gauges
Updated: 18-Feb-05
Printed: 18-Mar-05
Open Actions: 34
ECD Status Status Comments/Disposition/Conclusions
4/1/2005
3/25/2005
Open 3/14: Plan Mtg at NRL
Open 3/14: Plan Mtg at NRL
4/1/2005
4/1/2005
4/1/2005
4/15/2005
4/15/2005
4/1/2005
3/25/2005
Open 3/14: Plan Mtg at NRL
Open 3/14: Plan Mtg at NRL
Open 3/14: Plan Mtg at NRL
Open 3/14: Plan Mtg at NRL
Open 3/14: Plan Mtg at NRL
Open 3/14: Plan Mtg at NRL
Closed 3/14: Plan Mtg at NRL. Per agreement between John Ku,
Chris Fransen, and Paul Baird, Force gauge instrumentation during sine vibration testing will not be required by the GPO
V128 VIBE Investigate leasing of force gauges Bob Haynes
V129 VIBE Check clearance between XLAT and TIP.
V130 VIBE Provide back-up analysis to show reason for adding force gauges and how many are needed
Mike Foss / Martin
Nordby
Chris Fransen
3/25/2005
4/1/2005
3/25/2005
Closed 3/14: Plan Mtg at NRL. No longer necessary since force gauges will not be used.
Open 3/14: Plan Mtg at NRL. If interior screws need to be torqued, is there tool access?
Closed 3/14: Plan Mtg at NRL. Added cost to current baseline, which is currently no force gauges and only strain gauges on flexures. Upon further review, force gauges are not needed.
V131 VIBE Provide list of load cells suitable for CG determination Bill Raynor
A113 ACST Ensure enough cure time for radiator thermal joint (7 day RT cure) Marc Campell
4/15/2005
4/15/2005
Open 3/14: Plan Mtg at NRL.
Open 3/14: Plan Mtg at NRL
LAT-TD-00000-02 Page 37

GLAST LAT Project Environmental Test TIM, Day 1: Structural Tests, March 14, 2005
• Topic / presentation slide number:
• Submitted by:
• Actionee:
• Request:
• Reason / Comment:
LAT-TD-00000-02 Page 38