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Descent Trajectory Hover Trajectory LD Code Integration

Descent Trajectory Hover Trajectory LD Code Integration. John Aitchison March 5 th , 2009. Finalized Descent Trajectory {all payloads} De-Circularize → Retro →Throttle Down Coast→ Vertical Steering program a possibility

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Descent Trajectory Hover Trajectory LD Code Integration

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  1. Descent TrajectoryHover TrajectoryLD Code Integration John Aitchison March 5th, 2009 [John Aitchison] [Mission Ops]

  2. [John Aitchison] [Mission Ops] • Finalized Descent Trajectory {all payloads} • De-Circularize → Retro→Throttle Down Coast→Vertical • Steering program a possibility • Does provide savings if we need to start descent at altitudes approximately >25km • Dependent on TLI/LD iterations • LD Code Integration {all payloads} • Complete, will be finalized with updated code from each group • Hover Trajectory {arbitrary payload} • Near complete, small attitude control adjustments needed

  3. [John Aitchison] [Mission Ops] • Arbitrary Payload Analysis • Falcon 9 LLO Deliverable: ~5700kg • Falcon 9 H LLO Deliverable: ~18000kg • Mass Deliverable to Lunar Surface • LD Budget available for Structure, Power, Thermal, Comm, Attitude Inert, Usable Payload • Assuming descent engine thrust & attitude thrust scale accordingly

  4. Backup Slide Content [John Aitchison] [Mission Ops] • LD Code Integration • Sample Output (pg. 5) • Flow (pg. 6) • Code (pg. 10-26) • Hover Trajectory (pg. 7-8) • Descent Trajectory (pg. 9) • Steering Program Code (pg. 27-28) • Circ-Elliptical Using Attitude Thrusters (pg. 29-31)

  5. Sample LD Integration Output [John Aitchison] [Mission Ops]

  6. LD Code Integration Flow [John Aitchison] [Mission Ops] • Mass Inputs • Power, Communications, Attitude Inert, Payload/Locomotion • Iterates • Hop/Hover Trajectory, Prop System Inert Mass, Structural “Frame” Inert Mass, Attitude Prop Mass • Outputs • All final masses in LLO 6

  7. Hover Trajectory [John Aitchison] [Mission Ops] 7

  8. Hover Trajectory Code [John Aitchison] [Mission Ops] 8

  9. Descent Trajectory [John Aitchison] [Mission Ops] 9

  10. LD Integrated Code (pg. 1) [John Aitchison] [Mission Ops]

  11. LD Integrated Code (pg. 2) [John Aitchison] [Mission Ops]

  12. LD Integrated Code (pg. 3) [John Aitchison] [Mission Ops]

  13. LD Integrated Code (pg. 4) [John Aitchison] [Mission Ops]

  14. LD Integrated Code (pg. 5) [John Aitchison] [Mission Ops]

  15. LD Integrated Code (pg. 6) [John Aitchison] [Mission Ops]

  16. LD Integrated Code (pg. 7) [John Aitchison] [Mission Ops]

  17. LD Integrated Code (pg. 8) [John Aitchison] [Mission Ops]

  18. LD Integrated Code (pg. 9) [John Aitchison] [Mission Ops]

  19. LD Integrated Code (pg. 10) [John Aitchison] [Mission Ops]

  20. LD Integrated Code (pg. 11) [John Aitchison] [Mission Ops]

  21. LD Integrated Code (pg. 12) [John Aitchison] [Mission Ops]

  22. LD Integrated Code (pg. 13) [John Aitchison] [Mission Ops]

  23. LD Integrated Code (pg. 14) [John Aitchison] [Mission Ops]

  24. LD Integrated Code (pg. 15) [John Aitchison] [Mission Ops]

  25. LD Integrated Code (pg. 16) [John Aitchison] [Mission Ops]

  26. LD Integrated Code (pg. 17) [John Aitchison] [Mission Ops]

  27. Steering Program Code [John Aitchison] [Mission Ops]

  28. Steering Program Code (cont.) [John Aitchison] [Mission Ops]

  29. Circ-Elliptical Using Attitude Thrusters [John Aitchison] [Mission Ops] 29

  30. Circ-Elliptical Using Attitude Thrusters (pg.2) [John Aitchison] [Mission Ops] 30

  31. Circ-Elliptical Using Attitude Thrusters (pg.3) DeltaV = 9.2 m/s Attitude Propellant Mass = .82 kg [John Aitchison] [Mission Ops] 31

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