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Belatti wrote:you can use any spring you want to achieve the progression you want, by combination or not

to do it geometrically as you wish, just play a little bit till you find the progression in the motion ratio

Ok, very thanks.

I would like to demonstrate this mathematically.

Regards,

delacf

Belatti wrote:you can use any spring you want to achieve the progression you want, by combination or not
to do it geometrically as you wish, just play a little bit till you find the progression in the motion ratio.

Neat, Belatti, but please remember installation stiffness. The lower control arm is now in bending, so locking out the damper will not fix wheel position. Installation stiffness will comprise (at least) damper stiffness divided by MR^2 in series with LCA bending stiffness. Damper stiffness is likely to be between 3 & 4 KN/mm. If the overall installation stiffness at the wheels is much less than 1 KN/mm, then a lightly damped hub mode will become apparent with a natural frequency between 20 & 30 Hz (usually). Increasing damper settings will decrease the hub mode damping ratio.

Unless, of course, the damper gives up at a relatively low frequency.......

Here are some sample results (linear dampers). Hub mode damping becomes questionable below 1 KN/mm, I think....