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Kelly Leffel 2/19/09

Kelly Leffel 2/19/09. Structures and Thermal Lunar Descent Phase. 1. Updated Mass – Volume. Thermal Control . Current (Active/Passive Approach) MLI blanket – 1.5 kg Cryocooler – 8.1 kg and requires 40 W. BACK-UP SLIDES. Mass – Volume. 5. Volume Equations.

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Kelly Leffel 2/19/09

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  1. Kelly Leffel2/19/09 Structures and Thermal Lunar Descent Phase 1 Kelly Leffel Structures and Thermal

  2. Updated Mass – Volume Kelly Leffel Structures and Thermal

  3. Thermal Control Kelly Leffel Structures and Thermal • Current (Active/Passive Approach) • MLI blanket – 1.5 kg • Cryocooler – 8.1 kg and requires 40 W

  4. BACK-UP SLIDES Kelly Leffel Structures and Thermal

  5. Mass – Volume 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 (NO TOP) Volume(V) = 1/3 * pi * R^2 * H – 1/3 *pi*r^2

  7. Moments of Inertia (New height and cm position) Ixx = Iyy = m/4 * (3/2 *r ^2 + 5/24 h^2) = 70.3 kg – m^2 Izz = 3 *m*r^2/4 = 107.2 kg – m^2 Ixy = Iyz = -3*m*r^2/8 = -53.6 kg – m^2 Ixz=Izx=Iyz=Izy = -7/48 * m*r*h = -31.2 kg- m^2 7 Kelly Leffel Structures and Thermal

  8. Thermal Control Kelly Leffel Structures and Thermal • MLI Blanket • Teflon, Backed outer cover - 0.025 cm thick • 0.354 kg • Aluminized Kapton Inner Layer (7 Layers) • 0.497 kg • Dacron Netting separator layer (7 Layers) • 0. 287 kg • Aluminized Inner Cover • 0.323 kg 8

  9. Cryocooler Kelly Leffel Structures and Thermal • NGST MPT • 1 stage P-T • 1.2 W at 120 K • Power Required 40 W • Mass 8.1 kg 9

  10. References Kelly Leffel Structures and Thermal Lander Phase Group for Masses Spacecraft Thermal Control Handbook Volume I and II for Thermal Control data 10

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