1. Jeff Bolognese p1 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis Jeff Bolognese 16 November 2001

2. Jeff Bolognese p2 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis NASTRAN Finite Element Model Secondary support spider Metering structure (composite tube truss) Primary mirror (90% lightweighted fused silica with Ti bipods) Optical bench (composite face sheet/Al Honeycomb core with stiffeners) Aft Optics Assembly (Honeycomb with Composite frame and Ti flexures) S/C Mount Bipods (Composite tubes)

3. Jeff Bolognese p3 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis Modeling Details Truss and Secondary Support Spider M55J composite structure 2.5” diameter tubes (.25” thick) H-channel stiffening ring 3 tangent blade spider Trades done on 4 and 3 blade non-tan. Structure Primary Mirror and Mount 90% lightweighted Fused Silica for mirror 3 Titanium bipods

4. Jeff Bolognese p4 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis Modeling Details (Cont.) Optical Bench and S/C Mount Bipods Bench M55J composite facesheets with Al honeycomb core and composite stiffeners (6” deep) Bench mounts metering structure, primary mirror and aft optics module S/C mount bipods 5” diameter composite tubes (.25” thick) Aft Optics Structure Composite/Al honeycomb face sheets Composite truss structure 3 Ti flexure blades Lumped mass representation of fold and tertiary mirrors and detector assembly

5. Jeff Bolognese p5 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis Analyzed mass = 658 Kg Primary Mode = 32 Hz Materials  M55J Composite: E= 1.4e+7 psi, CTE= -1.8e-7 mm/mm/C  Titanium: E= 1.6e+7 psi, CTE= 8.8e-6 mm/mm/C  Fused Silica: E= 9.85e+6 psi, CTE= 5.0e-7 mm/mm/C Major structures included:  Metering structure  Secondary spider and secondary —18 Kg mass for mechanism  Optical bench  Primary mirror and mount  Aft optics structure  Simplified mass representation for fold, tertiary and detector FEM Summary

6. Jeff Bolognese p6 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis FEM does not include:  Baffles  Thermal masses  Solar arrays  Chopper mechanism  Full detector assembly mass  Spacecraft interface deck  Electronics boxes/harnessing FEM Summary (Cont.)

7. Jeff Bolognese p7 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis Analysis Summary Mode 1 = 32.4 Hz Mode 2 = 34.4 Hz

8. Jeff Bolognese p8 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis Analysis Summary (thermal distortion) 1c X grad1c Y grad1c Z grad

9. Jeff Bolognese p9 Super Nova/Acceleration Probe 16 November 2001 Structural Analysis Update structural masses  Rerun quasi-static stress and dynamics analyses Detailed model of detector assembly  Initial optimization analyses done on detector mount plate show lightweighting is feasible. Model S/C interface deck Additional updates for detailed structural/thermal/optical analysis  Detail optics and mounts  Apply on-orbit thermal loads Further optimization of aft optics module and flexure blades and other structures where practical. Future Analytical Work