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MB1 Advisory Committee Review April 27, 2006

MB1 Advisory Committee Review April 27, 2006 . Jake Adkins – Frame and Suspension Ya-Chi Chou – Accessories/Seats Adam Dean – Power Train Jay Mansheim – Power Train Saptarshi Mitra – Budget/Accessories Eric Rodgers – Frame and Suspension. Race Day Results. 3 rd Place Time of 5:08

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MB1 Advisory Committee Review April 27, 2006

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  1. MB1 Advisory Committee Review April 27, 2006

  2. Jake Adkins – Frame and Suspension Ya-Chi Chou – Accessories/Seats Adam Dean – Power Train Jay Mansheim – Power Train Saptarshi Mitra – Budget/Accessories Eric Rodgers – Frame and Suspension

  3. Race Day Results • 3rd Place • Time of 5:08 • Design Competition Winners • For best solving the problem of navigating the lunar surface • Most Improved Time • First run 7:21 • Second Run 5:08

  4. Budget

  5. Funding TEAM

  6. Expense Report

  7. Grand Total

  8. Design Conditions • Complies with all rules set forth to compete in the NASA competition in Huntsville, Alabama on April 13-14, 2007. • Weight: 80 lbs (192 lbs actual) • Top Speed of 20 mph • Able to handle 17” obstructions on various types of terrain TEAM

  9. Design Conditions • Reliable for a minimum of 10 miles • Braking from 20 mph to 0 mph in 20 feet TEAM

  10. Safety Factor • General 2 • Critical Weight 1.5 • High Dynamic loading (suspension) 4+ JM

  11. Frame and Suspension

  12. Frame (orthoscopic) ER

  13. Frame (top view) ER

  14. WaterJet files drawn in AutoCad

  15. Shear and Moment Diagrams ER

  16. ER/JA

  17. ER/JA

  18. ER

  19. Frame Hinge Assembly JA

  20. Drive Train

  21. Design Considerations • Both riders power one output • Chain tension constant during setup • Differential • Differential Placement/Drive shafts • Usable 7 speed gear range • Quality Components/adjustment • Wheels/tires AD/JM

  22. Original Chain Path ER/JM

  23. Original Chain Path JM/ER

  24. Modified Chain Path

  25. Target Gear Ratios • High gear ratio of 2.2:1 • Low gear ratio of .8:1 • Have a useable range of gears spaced in between to have a total of 7 speeds AD

  26. Gearing Options • Option 1 • 56/22/34-11/39 • Max Speed 13.8 mph @ 80 rpm • Max torque 324 ft lbs @ 350 lbs input • Option 2 • 56/16/34-11/39 • Max Speed 18.9 mph @ 80 rpm • Max torque 238 ft lbs @ 350 lbs input

  27. AD

  28. Simulated Items • Manufactured out of plastic • Vinyl - ABS/PVC Alloy (Density: 0.6 g/cm³) • Console, Battery box, TV box, Fender, some simulated items will use this material SM/Y-CC

  29. Problems Encountered

  30. Failure to fit in 4x4x4 box • Best solution would be to be a total redesign. • Corrective Action: installed a hinge on the front pedal tower.

  31. Rear Upper Air bag support brackets • MEA (mental element analysis) failed. • Corrective Action: adding cross-sectional area to failed area

  32. Rear A-arms • Rear A-arms were bent after testing on obstacles. • Corrective Action: added gussets to high stress points on rear lower A-arms.

  33. Driveshaft pin connection • Pins were sheared multiple times on rear inboard Universal Joints • Corrective Action: Welded it • Jammed an Allen wrench into it and broke it off

  34. Chain breaking • Chain was catching on sprocket mounting bolts. • Corrective Action: countersunk bolt heads

  35. Back of rear seat • Rear seat back broke • Corrective Action: welded it.

  36. Fenders • Fender mounts failed when bent three times • Corrective Action: Redesign of fender mounts. Problem was fixed for the race by simply removing the fenders.

  37. Things we would have done different. • More emphasis on handlebars and rider ergonomics. • Try to stick closer to manufacturing timeline. • Limit weight

  38. PITT THUNDER Questions? Questions?

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