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Structures Structural Layout & Interface

Structures Structural Layout & Interface. Curtis Arends. Presentation Outline. Derived Requirements Current Dimensional Constraints Launch & Impact g-loads Regolith Resistance to Penetration Nose Cone & Attachment Methods Module Architecture Rocket Motor Attachment & Ejection

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Structures Structural Layout & Interface

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  1. Structures Structural Layout & Interface Curtis Arends

  2. Presentation Outline • Derived Requirements • Current Dimensional Constraints • Launch & Impact g-loads • Regolith Resistance to Penetration • Nose Cone & Attachment Methods • Module Architecture • Rocket Motor Attachment & Ejection • Future Work Curtis Arends

  3. Derived Requirements The structure shall: • Remain within volume requirements of 8000 cm3 • Protect payload from a minimum 3900 gees [TBC] • Penetrate to a depth of 1.5 m to 2.5 m • Provide interface modules for the payload • Mechanically separate [TBD] m from SELENE I • Eject rocket motor 4.8 m [TBC] from velocity vector Curtis Arends

  4. Current Dimensional Constraints 6 cm 5 cm 30 cm + LN Curtis Arends

  5. H-11A Launch g-load Curtis Arends

  6. Theoretical Impact g-load D E P T H g Curtis Arends

  7. Resistance to Penetration Regolith Description • Basaltic composition • Dry, dense particles • Traces of water ice Earth Comparison • Ice (S=5) • Frozen soil (S=2.75) • Dense, dry sand (S=2 to 4) • 4 m • REGOLITH  S=2.5 Curtis Arends

  8. Nose Performance Coefficient Young’s Sandia Equation For 2 kg < mass < 27 kg: Nose Coefficient Required  N = 0.776 Curtis Arends

  9. Conic Nose Cone Cone Height LN = 5.18 cm Curtis Arends D = 6 cm

  10. Ogival Nose Cone Caliber Radius Head (CRH) LN = 7.2 cm Curtis Arends D = 6 cm

  11. Nose Attachment Concepts Shrink FitFastenersThreaded Fit Curtis Arends

  12. Module Architecture Slotted Module Curtis Arends

  13. Module Architecture Keyed Module Curtis Arends

  14. Rocket Motor Attachment Curtis Arends

  15. Rocket Motor Ejection Curtis Arends

  16. Future Work • Determine vibration loads • Define natural frequencies • Research mitigation techniques • Research manufacturing capabilities • Select and refine overall architecture • Design interface with SELENE I • Design prototype drop tests • Fabricate prototype Curtis Arends

  17. Questions?

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