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      05-08-2015, 12:46 PM   #183
135
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Drives: 135i
Join Date: Sep 2012
Location: Australia

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Quote:
Originally Posted by fe1rx View Post
Quote:
Originally Posted by 135 View Post
Quote:
Originally Posted by fe1rx View Post
This overestimates the ride natural frequency of the chassis, because it omits the tire deflection, which is about 0.41 inches assuming a tire rate of 2200 lb/in. Increasing static deflection to 2.85 in reduces the front natural frequency to 1.85 Hz.

...

This overestimates the ride natural frequency of the chassis, because it omits the tire deflection, which is about 0.37 inches assuming a tire rate of 2200 lb/in. Increasing static deflection to 2.88 in reduces the rear natural frequency to 1.84 Hz.

How did you calculate or approximate the tyre rate?

Tested ...

http://www.1addicts.com/forums/showp...5&postcount=17

I had previously read that post and noticed that you mentioned a tyre rate of "approximately 2000 lb/in" but in the above quoted post you used "2200 lb/in" so I was wondering how you had come to use 2200 lbf/in rather than 2000 lbf/in? And from which table did you draw the 2200 lbf/in value from?
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