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 • Future Work Curtis Arends

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

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

H-11A Launch g-load Curtis Arends

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

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

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

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

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

Nose Attachment Concepts Shrink FitFastenersThreaded Fit Curtis Arends

Module Architecture Slotted Module Curtis Arends

Module Architecture Keyed Module Curtis Arends

Rocket Motor Attachment Curtis Arends

Rocket Motor Ejection Curtis Arends

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

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Structures Structural Layout & Interface