**Re: How to determin ideal spring rates**

Mx" + Cx' + Kx = F(t) from that DE you can find k which is the ideal spring rate for whatever forcing function you subject your system to...a set of whoops could be synonymous with a sine function and so on. M is your mass, x" is acceleration, C is damping, x' is velocity (speed in your case), k spring rate, x distance, F(t) forcing function. Write a program in excel that models your system and lets you tinker with the variables and see what you come up with. I guess there is no "ideal spring rate" but if you want to shoot for one or a range, that would be the way to do it in few minutes without getting dirty. Pick up a book on vibs or mechanical systems and it will go into great detail on how to use the above DE.

Kris