Transcript Structural Analysis: Completed Tasks • LAT System Level LAT Environmental TIM Support

GLAST LAT Project
Nov-04
Structural Analysis: Completed Tasks
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LAT System Level
– LAT Environmental TIM Support
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LAT Instrumentation Progress
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LAT MPSR
A success  plans were well received with some additional analysis to be performed to work out
details, e.g. the large items are
– Identify which parts of LAT not qualified before dynamics tests (EBOX center I/F…)
– Identify additional instrumentation needed (strain gauges, primarily)
– Trade acoustic test mounting (RMB or Flexure mount)
Accelerometer purchase order submitted by I&T (Lee) with expected delivery by 1/14/05
Contingencies (additional channels needed for qualification verification) accounted for
Supported Systems Engineering regarding requirements traceability and verification
Provided LAT FEA Model information in support of FDLC2 data recovery
LAT Structural Analysis-1
GLAST LAT Project
Nov-04
Structural Analysis: Completed Tasks
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LAT Subsystem Level
– TKR Subsystem
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EBOX Subsystem
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Took a new direction for the Grid Static Test plan; initial review with GSFC promising
– New plan dramatically reduces test complexity
» Lower cost – simpler, may be feasible to test in-house
» Shorter schedule – less load cases result in less set-up time
– Does not compromise qualification verification; takes advantage of lower loads and
resulting high margins
Supported Grid NCRs and other issues
– Bushing recessed to far resulted in 4.4% reduction in MS
– Torque values for “weak” fasteners adjusted without compromising grid acceptance criteria
Completed RMB keensert testing; B-basis strength is significantly higher than needed; write-up in
process
MGSE
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LAT MPSR
No activity
Grid Subsystem
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TKR Flight Design
– Supported resolution of various insert strength and fastener torque issues
TKR Additional Studies
– Reviewed tray manufacturing SOW
– Completed some insert pullout testing to validate analysis assumptions; testing not
completed due to restrictions on UTM use
Final structural analysis report almost complete
High frequency acoustic analysis performed to evaluate acoustic test configuration. Still need to
perform low frequency analysis trade study
LAT Structural Analysis-2
GLAST LAT Project
Nov-04
Structural Analysis: Current Tasks In-process
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LAT System Level
– LAT Dynamics Testing
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LAT Thermal Distortion Analysis
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MGSE Final Report in-progress ECD=Oct-04
Radiator MGSE and SC simulator for acoustic test will commence in Sep-04
Shipping Container Analysis
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LAT MPSR
Final analysis and reporting of results pending further discussion ECD=Dec-04
MGSE for Integration Analysis
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Evaluate low freq acoustic loads into LAT in two configurations
Container analysis complete, Final report in-progress ECD=Oct-04
LAT Structural Analysis-3
GLAST LAT Project
Nov-04
Structural Analysis: Current Tasks In-process
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LAT Subsystem Level
– TKR Subsystem
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EBOX Subsystem
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Evaluate EBOX loads/accels when LAT is subjected to sine input
TPS component bonding issue (analyze for +3dB input)
Grid Subsystem
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LAT MPSR
Baseplate distortion analysis
– After the dithering process at Pisa, it was noted that the baseplate took on a permanent set
– There was concern that when the baseplate is installed in the vibration lab, the enforced
displacement BC will generate high loads in the TKR or flexures
Other analysis support? Flex cables? More torque issues?
Support TKR Tower-A testing in Italy
Shear plate qualification test complete; report in-process ECD=Nov-04
Grid Static Test plans/procedures/STE ECD=Dec-04
– Continue with newly developed, simplified test plan
Proof Test Spectrum provided flexures ECD=Jan-05
Test Grid ECD=Feb-05
Support RAD and XLAT issues, as needed ECD=Ongoing
LAT Structural Analysis-4
GLAST LAT Project
Nov-04
Structural Analysis: Conclusions/Remarks
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Conclusions
– Everything is going well
Remarks
– Schedule is in a constant state of flux – planning must stay extremely flexible
– Safety restrictions at SLAC affect analysis in that
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LAT MPSR
All structural tests on the UTM are restricted
Crane operations are restricted
Drop tests are restricted
Safety restrictions have some schedule impact, but work-arounds can mitigate this
somewhat (but not too much longer)
LAT Structural Analysis-5