1. LAT MPSRLAT Structural Analysis-1 GLAST LAT ProjectNov-04 Structural Analysis: Completed Tasks LAT System Level –LAT Environmental TIM Support 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) –LAT Instrumentation Progress 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

2. LAT MPSRLAT Structural Analysis-2 GLAST LAT ProjectNov-04 Structural Analysis: Completed Tasks LAT Subsystem Level –TKR Subsystem 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 –EBOX Subsystem No activity –Grid Subsystem 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 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

3. LAT MPSRLAT Structural Analysis-3 GLAST LAT ProjectNov-04 Structural Analysis: Current Tasks In-process LAT System Level –LAT Dynamics Testing Evaluate low freq acoustic loads into LAT in two configurations –LAT Thermal Distortion Analysis Final analysis and reporting of results pending further discussion ECD=Dec-04 –MGSE for Integration Analysis MGSE Final Report in-progress ECD=Oct-04 Radiator MGSE and SC simulator for acoustic test will commence in Sep-04 –Shipping Container Analysis Container analysis complete, Final report in-progress ECD=Oct-04

4. LAT MPSRLAT Structural Analysis-4 GLAST LAT ProjectNov-04 Structural Analysis: Current Tasks In-process LAT Subsystem Level –TKR Subsystem 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 –EBOX Subsystem Evaluate EBOX loads/accels when LAT is subjected to sine input TPS component bonding issue (analyze for +3dB input) –Grid Subsystem 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

5. LAT MPSRLAT Structural Analysis-5 GLAST LAT ProjectNov-04 Structural Analysis: Conclusions/Remarks 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 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)