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Lander Sizing and Launch Vibrations

Lander Sizing and Launch Vibrations. Feb. 12, 2009 Earth Launch/Lunar Descent Phase Group. 1. Structural Components of Legs on Lunar Lander. Previous mass = 4.30 kg for all legs New mass = 1.65 kg for all legs Length of legs cut in half Safety factor of 1.3 Assume 1 leg takes full load

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Lander Sizing and Launch Vibrations

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  1. Lander Sizing and Launch Vibrations Feb. 12, 2009 Earth Launch/Lunar Descent Phase Group [Ryan Nelson] [STRC] 1

  2. Structural Components of Legs on Lunar Lander Previous mass = 4.30 kg for all legs New mass = 1.65 kg for all legs Length of legs cut in half Safety factor of 1.3 Assume 1 leg takes full load Length of 0.5m per leg Legs oriented at 18.44° from vertical Legs initially retracted within the Lander 2

  3. Volume and Considerations • Previous Volume = approx. 2.75m3 • Estimated New Volume = 2.22m3 • Future Considerations • Aluminum honeycomb cartridge in primary struts can help absorb compression loads. • 0.89 m diameter footpads to stabilize Lander. • Eliminating skin can reduce structure mass by up to 10kg. 3

  4. Matlab code for Leg Loads 4

  5. Calculating for lunar Lander Volume(V) = 1/3 * pi * R^2 * (H+h) – 1/3 *pi*r^2*h - Volume equation obtained directly from Kelly Leffel presentation (week 4) 5

  6. Mass, Volume, Power used in Lunar Leg and Sizing Calculations 6

  7. Mass, Volume, Power used in Lunar Leg and Sizing Calculations -Fudge Factor added and considered in landing mass 7

  8. Launch Effects on Dnepr Payload • Vibration Loads • Longitudinal • Lateral • Acoustic Loads *Dnepr Users Guide-Reference 1

  9. Additional Vibration Analysis Structural stiffness should ensure values of fundamental frequency of Spacecraft are no less than 20 Hz in longitudinal and 10Hz in lateral. Dynamic Loads 8.3g max in longitudinal direction 1g max in lateral direction 9 *Dnepr Users Guide-Reference 1

  10. References http://snebulos.mit.edu/projects/reference/launch_vehicles/DNEPR/Dnepr_User_Guide.pdf http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070031872_2007031894.pdf http://www.apollosaturn.com/Lmnr/descent.htm 10

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