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Kelly Leffel

Kelly Leffel

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Kelly Leffel

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  1. Kelly Leffel Structures and Thermal [Kelly Leffel] [Structures and Thermal]

  2. Solar Radiation • Aluminum • About $250.00 per square meter with 1 cm thickness • Density 27 kg per square meter with a 1 cm thickness • Electrodynamic Dust Shield • 10 W/m2 for dust load of .64 g/cm2 • 91.5 % dust removal efficiency Lunar Dust Shield [Kelly Leffel] [Structures and Thermal]

  3. Antenna Motor [Kelly Leffel] [Structures and Thermal] • RE 16, 16 mm diameter, Graphite Brushes • 40 gram mass • Ambient temperature of -20 to 65 oC • Max. continuous torque of 3.95 mN-m • Power rating of 4.5 Watts • Cost of $192.95 each Questions ?

  4. Radiation Shield (options) [Kelly Leffel] [Structures and Thermal] • 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 oC)

  5. Aluminum Properties [Kelly Leffel] [Structures and Thermal] Density = 2700 kg/m3 Elastic Modulus = 7.31E10 Pa Heat Capacity = 963 J/kg oC Thermal Expansion Coefficient = 24.3 microns / m oC Melting Temperature = 580 oC

  6. Dust Shield [Kelly Leffel] [Structures and Thermal] • 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

  7. References [Kelly Leffel] [Structures and Thermal] • Aluminum Price • http://www.discountsteel.com/index.cfm/go/main.itemDisplay/itemID/74.htm • Aluminum 6061 Properties • http://edboyden.org/constants.html • Lunar Dust Shield • “Performance Analysis of Electrodynamic Self-Cleaning Transparent Films for its Applications to Mars and Lunar Missions”, Calle, C., IEEE, 2007

  8. [Kelly Leffel] [Structures and Thermal] • Antenna Motor • Maxon Motor https://shop.maxonmotor.com/ishop/article/article/118730.xml • Maxon Motor Catalog Page • https://shop.maxonmotor.com/maxon/assets_external/Katalog_neu/Downloads/Katalog_PDF/maxon_dc_motor/RE-programm/RE-16_118725_08_076_e.pdf