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Kelly Leffel 2/5/09

Kelly Leffel 2/5/09. Structures and Thermal Lunar Descent Phase. 1. Mass – Volume. Lander total wet mass = 275 kg Current available volume = 2.74 cubic meters Current volume of equipment = .26 cubic meters. Lander Model and Moments of Inertia. Ixx = Iyy = 271 kg-m^2 Izz = 464 kg-m^2.

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Kelly Leffel 2/5/09

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  1. Kelly Leffel2/5/09 Structures and Thermal Lunar Descent Phase 1 Kelly Leffel Structures and Thermal

  2. Mass – Volume • Lander total wet mass = 275 kg • Current available volume = 2.74 cubic meters • Current volume of equipment = .26 cubic meters Kelly Leffel Structures and Thermal

  3. Lander Model and Moments of Inertia Kelly Leffel Structures and Thermal Ixx=Iyy = 271 kg-m^2 Izz = 464 kg-m^2

  4. BACK-UP SLIDES Kelly Leffel Structures and Thermal

  5. Mass – Volume Continued 5 Kelly Leffel Structures and Thermal

  6. Volume Equations Kelly Leffel Structures and Thermal Surface Area(SA) = pi*R*S + pi*R^2 – pi*r*s Volume(V) = 1/3 * pi * R^2 * H – 1/3 *pi*r^2 Available Volume = V – SA*thickness of aluminum

  7. Moments of Inertia Ixx = Iyy = m/4 * (1.5 *r ^2 + h^2) = 271 kg – m^2 Izz = 3 *m*r^2/4 = 464 kg – m^2 Ixy = Iyz = 3*m*r^2/8 = -232 kg – m^2 Ixz=Izx=Iyz=Izy = -90 kg-m^2 7 Kelly Leffel Structures and Thermal

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