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WFIRST Telescope Preliminary Analysis Study

Detailed analysis of WFIRST Telescope modeling with completed CAD, thermal, finite element models, and ground alignment simulations. Includes mass breakdown and thermal results for the telescope components. Next steps involve applying temperatures to the model and calculating wavefront error stability.

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WFIRST Telescope Preliminary Analysis Study

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  1. WFIRST Telescope StudyPreliminary Analysis Renaud Goullioud, Gary Kuan, Jim Moore, Eric Sunada, Juan Villalvazo, Zensheu Chang JPL in collaboration with the Goddard team SDT#7 Telescope

  2. Telescope Modeling Status • Completed detailed CAD model. • Completed Thermal model. • Completed Finite element model. • Competed Optical Tolerancing model. • Modeled Ground Alignment of Telescope: • Requires 5 DoF on SM and tip/tilt of ImC Fold mirror • Requires tip/tilt of SpC F2 and tip/tilt/piston of SpC TM • Modeled Ground to On-orbit Gravity shift: • Gravity shift can be taken out by the SM mechanism 5 DoF. SDT#7 Telescope

  3. Telescope CAD model Secondary Mirror Primary Mirror Imager Tertiary Mirror Imager Feed Mirror Imager Fold Mirror SDT#7 Telescope

  4. Telescope Mass Breakdown SDT#7 Telescope

  5. Telescope Finite Element Model Node count: 103,219 Element count: 209,748 Mass: 1,139.0 kg Element type: CBAR: 305 CHEXA: 16,776 CONM2: 14 CPENTA: 6,798 CQUAD4: 91,648 CTETRA: 81,790 CTRIA3: 12,115 CTRIA6: 202 RBAR: 8 RBE2: 69 RBE3: 23 Boundary conditions: Ends of the 3 bipods fixed SDT#7 Telescope

  6. Telescope First Mode Mode 1 Mode 2 17.78 Hz, Telescope moves from side to side 18.77 Hz, Telescope moves from front to back SDT#7 Telescope

  7. WFIRST Thermal Model 9006 TD/RC Nodes 23 User Nodes 8 boundary (SC at 313.2K) 3538 MLI (non graphical) Surfaces 8675 planar elements 413 surfaces 50 heaters SDT#7 Telescope

  8. Temperature Plot (at Nominal orientation) SDT#7 Telescope

  9. Thermal Model - Cutout view SDT#7 Telescope

  10. Primary, Secondary and Fold Mirrors (Nominal) IMC Tertiary IMC Feed Secondary mirror IMC Fold Primary mirror SDT#7 Telescope

  11. Spacecraft Orientation (View From the Sun) Nominal Roll 10 deg, Pitch 36 deg SDT#7 Telescope

  12. Thermal Results Summary SDT#7 Telescope

  13. Temperature Change vs. Orientation Delta_T ( T_nominal – T_ Roll 10 pitch 36) Front Back Primary mirror Secondary mirror SDT#7 Telescope

  14. Temperature Change vs. Orientation Delta_T ( T_nominal – T_ Roll 10 pitch 36) Front Fold Back Imager Tertiary SDT#7 Telescope

  15. Next Steps • Apply temperatures to the Finite Element Model. • Calculate wavefront error stability using optical modal. • Reduce temperature to 200K. • Calculate wavefront error stability. • Turn off thermal control (160-180K). • Calculate wavefront error stability. SDT#7 Telescope

  16. Heaters off: Telescope Temperature Secondary mirror Primary mirror Imager Fold mirror SDT#7 Telescope

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