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AAE 450 - Senior Design

AAE 450 - Senior Design. Alec Spencer Critical Design Review: Science Package 6 March 2001. Science Overview. Greenhouse Materials and Structure Design Assembly Pressurized Rover Mission Planning. Greenhouse. Envelope made of ETFE (ethyl-tetra-fluoro-ethylene) Similar to Teflon

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AAE 450 - Senior Design

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  1. AAE 450 - Senior Design Alec Spencer Critical Design Review: Science Package 6 March 2001

  2. Science Overview • Greenhouse • Materials and Structure • Design • Assembly • Pressurized Rover • Mission Planning

  3. Greenhouse • Envelope made of ETFE (ethyl-tetra-fluoro-ethylene) • Similar to Teflon • Self cleaning • Chemical and heat resistance • Restraint device • Kevlar or Spectra cables • Staked into soil • Floor • Substrate to cover soil • Foam rubber base

  4. Greenhouse • Self-supporting inflatable geodesic dome • 55 hexagon, 12 pentagon shaped pillows • 3 layers of foil per pillow (outside, middle, inside) • Reduces convective heat loss • Redundancy if outer layer is punctured • Floor and ground matting • 1 cm foam rubber • Reduce wear, puncture possibilities

  5. Greenhouse • Design • Used code to optimize sizing • Selection criteria • 1 tonne maximum mass • Useable floor space • Ceiling > 2m • Pressure requirements • Heating requirements • Packed volume

  6. Greenhouse Design • Iterated over inner radius and partial sphere angle • Computed mass of foil envelope, floor space, and ground footprint

  7. Code Results - Mass Includes two 25 kg space heaters and one 50 kg pressure regulator

  8. Code Results – Floor Area

  9. Code Results - Ceiling

  10. Pressurized Rover • Human Requirements • Nominal Distant Excursion • Emergency Habitat • Tanks sized for emergency

  11. Rover Power Breakdown • Mobility power estimated as 0.1 W-hr/kg/km • Methanol/LOX energy density • 2129 W-hr/kg • 2093 W-hr/L

  12. Mission Planning • Goals • Maximize science return • Minimum 10,000 km on rover odometer • Cover maximum area on distant excursions

  13. Mission Planning • Built around flexibility • 42 Full rest days • Distant Excursions • 14 days in rover • 2 days rest • 14 days analysis • 1 day rest • 14 days analysis • 1 day rest • 78% of days on Mars are spent doing science

  14. Mission Design 3 500 km 500 km • 1 days travel to next site • (167 km travel per day) • 1 day stay at inner radius • 2 days stay at mid and • outer radius • Max area covered • Flexible schedule • No need to stop • needlessly 8 6 333 km 5 1 167 km 10 9 2 4 7

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