AAE450 Spring 2009 Kelly Leffel Structures and Thermal [Kelly Leffel] [Structures and Thermal]

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Presentation transcript:

AAE450 Spring 2009 Kelly Leffel Structures and Thermal [Kelly Leffel] [Structures and Thermal]

AAE450 Spring 2009 Solar Radiation  Aluminum –About $ per square meter with 1 cm thickness –Density 27 kg per square meter with a 1 cm thickness  Electrodynamic Dust Shield –10 W/m 2 for dust load of.64 g/cm 2 –91.5 % dust removal efficiency [Kelly Leffel] [Structures and Thermal] Lunar Dust Shield

AAE450 Spring 2009 Antenna Motor  RE 16, 16 mm diameter, Graphite Brushes –40 gram mass –Ambient temperature of -20 to 65 o C –Max. continuous torque of 3.95 mN-m –Power rating of 4.5 Watts –Cost of $ each Questions ? [Kelly Leffel] [Structures and Thermal]

AAE450 Spring 2009 Radiation Shield (options)  Aluminum –Used in prior missions  Graphite nano-fiber materials with hydrogen added –Currently being considered for future missions  Polyethylene –Good radiation shielding properties, but lower melting temperature than aluminum (100 o C) [Kelly Leffel] [Structures and Thermal]

AAE450 Spring 2009 Aluminum Properties  Density = 2700 kg/m 3  Elastic Modulus = 7.31E10 Pa  Heat Capacity = 963 J/kg o C  Thermal Expansion Coefficient = 24.3 microns / m o C  Melting Temperature = 580 o C [Kelly Leffel] [Structures and Thermal]

AAE450 Spring 2009 Dust Shield  Experiments ran for continuous and intermittent intervals up to 3 hours  Continuous –Electrodes prevented the dust from collecting –97.6 % dust removal efficiency  Intermittent –Levitated and then sent to edge by traveling wave –91.5 % dust removal efficiency [Kelly Leffel] [Structures and Thermal]

AAE450 Spring 2009 References  Aluminum Price – ain.itemDisplay/itemID/74.htm  Aluminum 6061 Properties –  Lunar Dust Shield –“Performance Analysis of Electrodynamic Self-Cleaning Transparent Films for its Applications to Mars and Lunar Missions”, Calle, C., IEEE, 2007 [Kelly Leffel] [Structures and Thermal]

AAE450 Spring 2009  Antenna Motor –Maxon Motor cle/ xml –Maxon Motor Catalog Page nal/Katalog_neu/Downloads/Katalog_PDF/maxon_ dc_motor/RE-programm/RE- 16_118725_08_076_e.pdf [Kelly Leffel] [Structures and Thermal]