1. ROVER EGRESS DESIGN 11/9/2011 Hahna Alexander Anton Galkin Zack Morrison 1

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

3. Ready to Manufacture 3

4. 4 Drawings Bill of Materials Finalized

5. Hinge Modifications 5

6. Spring Deployment Mechanism 6

7. 7  Frangibolts Reusable, Expensive  Hitch Pin for Earth-Ramps practical  Adjustable for Lunar Design

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

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

10. Moment on Ramp Segments 10

11. Moment Drives Truss Design 11

12. Moment Drives Truss Design 12

13. Tapered Design Considered 13 Taper No Taper

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

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

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

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

18. Composite Testing 18  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 19

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

21. Questions? 21

22. Moment Drives Truss Design 22