2.810 Car Suspensions James Penn 10/25/2010

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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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### 2.810 Car SuspensionsJames Penn10/25/2010

Video

2008 2.810 Contest Second Round

Video

2008 2.810 Contest Final

Video

2008 Team C vs Speed Bump

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.

logarithmic decrement

to damp oscillation of sprung mass by

order of magnitude in one period

Natural Frequencies

Want low

Want high

Natural Frequencies

Want low

Want high

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