Download AAE450 Spring 09 - Purdue College of Engineering

Spinning Descent and
Compressed Gas Hopper
Christine Troy
Assistant Project Manager
Webmaster
Lunar Descent Attitude Control Analysis
Design Alternative Evaluation
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AAE450 Spring 2009
Christine Troy
Attitude
Problem

Decrease mass, power, volume,
cost, and/or integration complexity
through design alternatives
1) Spinning lander on descent for attitude
control
2) Compress gas with force of landing
and release stored energy for hopping
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AAE450 Spring 2009
Christine Troy
Attitude
 Spinning Lander
– Initial analysis: 1.7 kg attitude propellant savings
• Increased complexity, small mass margin for required structural
changes, not recommended for large payloads
– New mass properties: 2.2 kg attitude propellant savings
• Possible benefits for very small payloads
 Compressed Gas Hopper
– Some or all travel could be obtained from bouncing using stored
descent energy
– Compressed gas not recommended – highly temperature
sensitive, limited velocity and acceleration inputs
• Commercial gas springs limited to approx. -23° to 82°C
– Lunar surface temperature -153° to 107° C
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AAE450 Spring 2009
Christine Troy
Attitude
References
 Rauschenbakh, Boris, Michael Ovchinnikov, and Susan
McKenna-Lawlor. Essential Spaceflight Dynamics and
Magnetospherics. Dordrecht, The Netherlands: Kluwer
Academic Publishers, 2003.
 Wiesel, William. Spaceflight Dynamics. New York:
McGraw-Hill, 1997.
 Howell, Kathleen. Notes from A&AE 440. Spring 2008.
 Dengel, Yunus and Michael Boles. Thermodynamics.
Boston: McGraw-Hill, 2002.
 Industrial Gas Springs and Dampers. Enidine Product
Guide. 2007.
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AAE450 Spring 2009
Christine Troy
Attitude