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Optimizing Mars Exploration: Greenhouse and Rover Design for Science Mission 2001

Critical Design Review of Science Package showcased on March 6, 2001, detailing the Greenhouse and Pressurized Rover components for the Mars mission. The Greenhouse features an ETFE envelope and geodesic dome structure with insulating foil layers, while the Rover is equipped for human requirements and distant excursions. Mission Planning focuses on maximizing science return with flexible schedules and rest days. The design emphasizes efficiency in travel and analysis to cover extensive areas on Mars, ensuring a successful scientific mission.

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Optimizing Mars Exploration: Greenhouse and Rover Design for Science Mission 2001

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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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