Probe into Necessity of Active Suspension Based on LQG Control

The objective of this research is to provide a systematic probe into necessity of the active suspension based on LQG control for supplying some reference to optimal design of the suspension based on LQG control. A strict mathematical reasoning shows performance of the active suspension based on LQG control has nothing to do with the suspension stiffness and basal damp. Variable suspension stiffness and basal damp simulations show the global damping characteristics of control force becomes obviously negative from obviously positive with the basal damp increasing regardless of the suspension stiffness. So there is a probability that performance of the semi-active suspension based on LQG control can be very close to the active one when the basal damp is small. When the basal damp is small, the simulation shows quadratic performance index of the semi-active suspension based on LQG control is only 1.76% bigger than that of the active one. So there is no necessity of the active suspension based on LQG control.