Evaluating Chassis Stiffness, any ideas? |
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Evaluating Chassis Stiffness, any ideas? |
McMark |
Jan 26 2007, 03:08 PM
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#1
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I've been thinking about this for a long time. I would like to be able to quantitatively evaluate chassis stiffness. I have some ideas for increasing stiffness, but I'd like to be able to measure those changes by something other than the seat of my pants ("It feels stiffer.").
My best idea so far is to place a car on three jack stands of equal height and measure the droop of the fourth corner. Any other ideas? Any physicists that can help out here? |
r_towle |
Jan 26 2007, 09:17 PM
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#2
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Custom Member Group: Members Posts: 24,624 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
The whole chassis resonance thing was done, and a detailed article of the test on a 914 appeared in "up-fixin der porsche" (I forget which one)
The test was done in a big lab in CA, and the results were a cage built to add strength the the 914. McMark, If you want to personally test and existing car, or a customers car as you are working on it...build a jig. I would think that two fixtures (jack stands) bolted to the suspension ear, and two bolted to the opening in the fender where the strut bolts (without the bearing) would be enough to measure not only a twisted condition, but the current state of flex... Rich |
Mid_Engine_914 |
Jan 27 2007, 05:52 AM
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#3
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Member Group: Members Posts: 195 Joined: 22-September 06 From: Left Coast Member No.: 6,888 |
The whole chassis resonance thing was done, and a detailed article of the test on a 914 appeared in "up-fixin der porsche" (I forget which one) The test was done in a big lab in CA, and the results were a cage built to add strength the the 914. It would be great to see that article. I've already found some numbers for comparison. http://www.bmwworld.com/models/z4/suspension.htm QUOTE "The correlation between chassis rigidity and athletic handling has long since ceased to be a mystery," wrote Car and Driver in its April '02 issue. BMW knows this: With each new vehicle generation, BMW further advances vehicle dynamics by improving this "stable platform" of chassis rigidity. Thus BMW's structural engineers have developed a body/chassis structure with exceptional stiffness for a roadster. They achieved 21 Hertz - truly outstanding for a roadster, and close to the 25-26 Hz of today's BMW sedans. |
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