Hello,

I have been trying to simulate the active groundhook system in Matlab/Simulink. The force equation for the groudhook actuator force is given by F_gnd = -c_gnd*vel_wheel, where c_gnd is the groundhook gain and vel_wheel is the wheel vertical velocity. However, when I try to simulate the model, the suspension system acts very strange where I see very high values for the sprung mass and also the dynamic wheel loads are very relative to the passive or skyhook model. No matter how small or high my the c_gnd value is, the performance does not improve. Any suggestions on this issue will be appreciated.

Thank you