# Automotive How to find "equivalent stiffness" of the suspension system?

1. Apr 1, 2016

### yunias

Dude i have a problem to find the equivalent stiffness (k') and damping (c') of this equation ? thank youvery much physics forum

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2. Apr 7, 2016

### Greg Bernhardt

Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

3. Apr 13, 2016

### devecseri

You may want to look into potential energy methods

4. Apr 13, 2016

### devecseri

You add up and combine all of the spring energies taking into account springs in series act like resistors in parallel, then you factor out your x or theta if its rotational isolating the stiffnesses. Potential energy V=k(eq)*x^2

You'll end up with something like V=( terms with k )*x^2

5. Apr 13, 2016

### devecseri

Not sure how to factor dampers into a stiffness i feel like they would be ignored

Only other thing i know to do is to write out the fbd of your masses and the middle section on the 2nd image, laplace transform the system equations and get the transfer functions but I'm not sure if that helps you

6. Apr 13, 2016