GLAST Proposal Review

1
GLAST Large Area Telescope Mechanical Systems
Peer Review 27 March 2003 Section 4.7
Fabrication Verification Radiator, XLAT,
Heatpipes Brenda Costanzo Lockheed Martin System
Engineer brenda.costanzo_at_lmco.com
2
Radiator Fabrication (1 of 2)
Bond Pipes To OB Facesheet
Inspect Thermal Bond Visual
Machine Transfer Datums
Assemble Panel and Bond
Fit Check Core
Verify Cure Profile
Process Samples To Lab
Inspect Holes w/ Pins
Prep and Install Inserts Spools
Inspect Inserts Spools
Bond IB Doublers RT Cure
CMM Inspect Geometry
Bond OB Doublers AC Cure
Verify Cure Profile
Inspect Doublers
Bond Top Edge Closure
A
3
Radiator Fabrication (2 of 2)

• Notes
• All panel moves require inspection
  documentation of panel for damage packaging for
  
• transport and flight approved move procedures.
• No outside storage.
• Qualified flight transportation personnel and
  equipment.

4
M P Plan, EEE Parts

• M P Plan submitted to SLAC (GLS00018-2, dated 1
  Feb 2003)
• EEE Parts
• Heaters Minco Kapton Foil Heaters per GSFC
  S-311-P-079
• Thermistors YSI Thermistors per GSFC S-311-P-18
• RTDs Rosemount PRT per GSFC S-311
• Solid State Thermostats Micropac 52372O
• Submitted to SLAC for approval Nov 2002

5
Overall Test Philosophy

• Tests are broken into three categories
• In process
• Assembly
• Joint assembly
• Benchmark tests will be performed to assess any
  changes due to environmental testing
• IR Heat pipe signature
• Low level sine vibration
• Test plan is document GLS0002-03
• All testing will have procedures written prior to
  commencement
• Inspection occurs throughout the testing at
  points specified in the procedure
• Flash reports will be written within 3 working
  days of test completion
• Full reports will be written within 30 days of
  test completion or by pre-ship review, whichever
  is earlier

6
Overall Test Flow
7
Heat Pipe In-Process and Acceptance Testing

• In process testing
• Verification of material certifications
• Inspection of physical dimensions
• Verification that LM procedures are followed
• Acceptance testing

8
Radiator and X-LAT Panel In-Process Testing

• Radiator and X-LAT Panels
• Verification of material certifications
• Inspection of physical dimensions
• Verification the LM procedures are followed
• Radiator Panels
• X-LAT Panels
• Visual inspection of pipe/panel bonds

9
Radiator Mechanical Acceptance Tests

• Test configuration
• Each radiator panel assembly tested separately
• Test flow

Vibration Testing
Low Level Sine Survey
Pre-Vibration IR Signature
Low Level Sine Survey
Post-Vibration IR Signature
Acoustic Vibration
Sine Vibration
Limit Load Test
10
X-LAT Plate Qualification Testing

• Test configuration
• One protoqual X-LAT plate assembly
• Test flow

11
X-LAT Assy Mechanical Acceptance Tests

• Test configuration
• X-LAT Assy (two X-LAT panels and one mid-plate)
• Test flow

12
X-LAT/Radiator Assy Thermal Testing

• Combining the X-LAT and Radiator Assy thermal
  testing
• Cost savings (1 test versus 2 tests)
• Minimizes STE
• Tests X-LAT pipe to Radiator pipe thermal joint
• Hardware configuration
• X-LAT Assy
• Radiator Assy
• Heater plate to introduce heat into the system
• Lab electronics to control VCHPs
• Hardware orientation
• X side up
• Level within 0.10

13
Test Orientation
NO SCALE
Flight Radiators (2)
Flight X-LAT Assy
MLI Blanket
Gravity is Down
Cold Wall
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X-LAT/Radiator Assy Thermal Test Flow
Thermal Cycle 4
IR Signature
Cold Portion of Thermal Cycle
Post-Cycling Functional Test
Hot Balance Point
Delivery In-Place to SLAC
TCS Thermal Testing
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TCS Thermal Testing

• Hardware Configuration
• Radiator Assy
• X-LAT Assy
• Downspout heat pipes (TBR)
• LAT mass simulator
• Test Objective
• Verify VCHP reservoir heater operational
  algorithm
• Test Flow

16
Further Work

• Determine appropriate structural testing for
  Radiator and X-LAT Assemblies
• Determine X-LAT Assy and Radiator Assy
  configuration for thermal testing (together or
  separate)
• Design STE (Special Test Equipment) and GSE
  (Ground Support Equipment)
• Determine if TCS thermal test objective can be
  achieved during XLAT / Radiator Assy thermal test
• Determine what additional hardware will be
  available
• If performing separate TCS test, design LAT mass
  simulator
• Write test procedures