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Rover Egress Design 11/9/2011

Rover Egress Design 11/9/2011. Hahna Alexander Anton Galkin Zack Morrison. Results Outline. Ramp Segment Design Hinge Design Deployment Mechanism Composite Analysis Fabrication. Ready to Manufacture. Ready to Manufacture. Drawings Bill of Materials Finalized.

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Rover Egress Design 11/9/2011

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  1. Rover Egress Design11/9/2011 Hahna Alexander Anton Galkin Zack Morrison

  2. Results Outline • Ramp Segment Design • Hinge Design • Deployment Mechanism • Composite Analysis • Fabrication

  3. Ready to Manufacture

  4. Ready to Manufacture Drawings Bill of Materials Finalized

  5. Hinge Modifications

  6. Spring Deployment Mechanism

  7. Spring Deployment Mechanism • Frangibolts Reusable, Expensive • Hitch Pin for Earth-Ramps practical • Adjustable for Lunar Design

  8. Ramp Segment Design • Flange • 4” Height • No Taper • X+ Pattern • Reduced Thickness

  9. Design Changes: Base Pattern • Changed Base Platform Pattern: ANSYS OLD NEW

  10. Moment on Ramp Segments

  11. Moment Drives Truss Design

  12. Moment Drives Truss Design

  13. Tapered Design Considered Taper No Taper

  14. Buckling • Finite Element Analysis • Strange Results • Hand calculations • Factor of Safety = 3

  15. Design Parameter Optimization Strength-to-Weight Ratio Factor of Safety Sheet Metal Thickness Fillet Radius X Pattern Dimension #1 X Pattern Dimension #2

  16. Ramp Segment Design • Flange • 4” Height • No Taper • X+ Pattern • Reduced Thickness

  17. ANSYS Results • ANSYS simulations for stress and buckling used to improve design

  18. Composite Testing • Off-Planet use of composites more practical than Aluminum • Composites will be lighter • About 2.25kg, Full two segments (no holes), FOS >2

  19. Composite Testing

  20. Work to be Completed • Manufacturing – NREC, mfg.com • Implementing the Test Plan • Geometry, Small Scale, Landing Conditions, etc. • 1Written Blog Left • Final Paper

  21. Questions?

  22. Moment Drives Truss Design

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