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2.810 Car Suspensions James Penn 10/25/2010

2.810 Car Suspensions James Penn 10/25/2010. Video. 2008 2.810 Contest Second Round. Video. 2008 2.810 Contest Final. Video. 2008 Team C vs Speed Bump. Bump. Bump. Bump. No Suspension. Quarter Car Suspension Model. Quarter Car Suspension Model. 2 nd Order Frequency Response.

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2.810 Car Suspensions James Penn 10/25/2010

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  1. 2.810 Car SuspensionsJames Penn10/25/2010

  2. Video 2008 2.810 Contest Second Round

  3. Video 2008 2.810 Contest Final

  4. Video 2008 Team C vs Speed Bump

  5. Bump

  6. Bump

  7. Bump

  8. No Suspension

  9. Quarter Car Suspension Model

  10. Quarter Car Suspension Model

  11. 2nd Order Frequency Response

  12. Quarter Car Suspension Model

  13. Car and Unsprung Responses

  14. Quarter Car Suspension Design Unsprung mass should be much less than sprung mass. Suspension should be just stiff enough to keep the unsprung response faster than the input.

  15. mc=0.5kg, mus=0.02kg,ks=150N/m, v=3m/s

  16. Adding Damping logarithmic decrement to damp oscillation of sprung mass by order of magnitude in one period

  17. mc=0.5kg, mus=0.02kg,ks=150N/m, cs=5.9Ns/m, v=3m/s

  18. Half Car Suspension Model

  19. 2008 Team C, v=3.5m/s

  20. 2008 Team C, v=4m/s

  21. 2008 Team C

  22. 2008 Team C Halfcar Model

  23. Natural Frequencies Want low Want high

  24. 2008 Team C Redesign

  25. Natural Frequencies Want low Want high

  26. 2008 Team C Redesign, v=3.5m/s

  27. 2002 Team C (Record Holder)

  28. 2002 Team C Halfcar Model

  29. 2002 Team C, v=3.5m/s

  30. Concluding Thoughts • Minimize unsprung mass • If rear suspension is pivoting, move motor forward. • Avoid placing center of mass far forward. • Avoid making suspensions too stiff. • Thin, long sheets (k~(t/L)3) • kparallelogram=2*E*b*(t/L)3 • ωn,c≈30rad/s, ωn,us≈100rad/s

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