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Effect of Shock absorber Damper force variation on wheel hub force (Vertical Direction) and Damper attachment load is opposite in nature.

Changing Damper force has the following effect on loads
1) With default Damper properties the wheel Hub load is X and the shock absorber mount load is Y (checking the peak load & RMS loads)
2) Decreasing Damper force (i.e.., Damping coefficient reduced by 50%) increases wheel Hub forces to (X+X1) & Decreases the Shock Absorber mount load to (Y-Y1)
3) Increasing Damper force decreases the WHeel Hub force (X-X2) and increases the shock absorber mount load to (Y+Y2)
 
The Suspension is a Torsion Beam type suspension.
 
I am running on Rough Road.
 
Checking the PSD plots shows a maximum variation between 10Hz to 15 HZ in the Vertical direction.
 
 
Can anyone explain the phenomenon