Hi all, I'm attempting to optimise a suspension system's spring and damping rate via vibrational analysis. Working in the frequency domain, I have calculated the input-output relationship as a ratio (i.e. ground to body, x/q2 in the attachment) and the mean square acceleration response based on an input modelled using an exponential power spectral density. From here I want to calculate the corresponding stroke of the suspension components and the separation between the road and the suspension system as a measure of road adhesion. My intention is to optimise the k and c values based on these three measures. So what I'm asking is how do I relate the frequencies I've used in my MSAR calculation to the change in vertical height of the road or vice versa? Or am I going about this in the wrong way? Attached is the half car model I'm using and the key equations along with my rough spreadsheet used for calculations. Thanks in advance.