2 810 car suspensions james penn 10 25 2010 n.
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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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Presentation Transcript
video
Video

2008 2.810 Contest Second Round

video1
Video

2008 2.810 Contest Final

video2
Video

2008 Team C vs Speed Bump

quarter car suspension design
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.

adding damping
Adding Damping

logarithmic decrement

to damp oscillation of sprung mass by

order of magnitude in one period

natural frequencies
Natural Frequencies

Want low

Want high

natural frequencies1
Natural Frequencies

Want low

Want high

concluding thoughts
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