AAE 450 Senior Design Alec Spencer Critical Design

Science Overview z. Greenhouse y. Materials and Structure y. Design y. Assembly z. Pressurized

Greenhouse z. Envelope made of ETFE y. Similar to Teflon y. Self cleaning y.

Greenhouse z. Self-supporting inflatable geodesic dome y 55 hexagon, 12 pentagon shaped pillows y

Greenhouse z. Design y. Used code to optimize sizing y. Selection criteria x 1

Greenhouse Design z Iterated over inner radius and partial sphere angle z Computed mass

Code Results - Mass Includes two 25 kg space heaters and one 50 kg

Pressurized Rover z Human Requirements y. Nominal Distant Excursion y. Emergency Habitat z Tanks

Rover Power Breakdown z Mobility power estimated as 0. 1 W-hr/kg/km z Methanol/LOX energy

Mission Planning z. Goals y. Maximize science return y. Minimum 10, 000 km on

Mission Planning • Built around flexibility • 42 Full rest days • Distant Excursions

Mission Design 1 days travel to next site (167 km travel per day) 1

Slides: 14

Download presentation

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

Science Overview z. Greenhouse y. Materials and Structure y. Design y. Assembly z. Pressurized Rover z. Mission Planning

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

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

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

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

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

Code Results – Floor Area

Code Results - Ceiling

Pressurized Rover z Human Requirements y. Nominal Distant Excursion y. Emergency Habitat z Tanks sized for emergency

Rover Power Breakdown z Mobility power estimated as 0. 1 W-hr/kg/km z Methanol/LOX energy density y 2129 W-hr/kg y 2093 W-hr/L

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

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

Mission Design 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 500 km 3 500 km 8 6 333 km 5 1 167 km 10 9 Flexible schedule No need to stop needlessly 2 4 7