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HI all, VW has their new DCC "dynamic chassis control" system that uses semi-active dampers. Anyone know their system bandwidth? Similar to GM's recent magne-ride incarnations? This vid suggests bandwidth is similar - enough for low-frequency bumps but not high frequency ones...

Hi all, Anyone heard why the "track package" omits the MR dampers? Cheers.

Hi all, Does someone have a link to a tire slip angle diagram, so I can see how it changes from dry to wet? I want to understand why tires behave the way they do in the wet (e.g., cornering force past the peak at very high slip angles, is a larger % down from the peak, in the wet vs. dry, or...

I digested it, <burp!>, and I learned something, but the author didn't touch on the subject of the distribution of the road displacement. IIRC a random input variable can be described as having a given spectral density, and a distribution curve. For example, noise with a flat spectral density...

So some cars do break welds or sheetmetal - the BMW "clown shoe" Z3 coupe rear shock towers comes to mind. For cars that don't outright break stuff, do spot welds degrade or microcrack or fatigue or something, over time, from age and normal use?

Thanks for the tip! I will go and digest it.

Bueller? Anyone? Would a probability density function of instantaneous acceleration, with a spectral density function, adequately describe a given "type" of road surface?

How about a car in the absence of extreme abuse nor rust? Do spot welds weaken over time from "normal" use?

Especially torsional rigidity? Cheers.

Hi all, I've built a simple quarter car suspension model which I am using for my own education. Does anyone have, or have a link to, a road surface model, for use in a quarter car model? I've seen power (or amplitude) vs. frequency distribution plots, but these are good for linear systems...