Vibration isolation analysis for vehicle semi-active control suspension systems

Magnetorheological fluid (MRF) damper is very good for real-time damp force control in vehicle suspension systems. The damping force of a MRF damper was analyzed using Bingham model and all the fac- tors having effect on the damping force of a MRF damper were discussed by studying the experimental data of self-made MRF shear-valve damper. The semi-activity suspension system is made of smart material and the ac- tuating element is a MRF damper. The processor analyze the vibration information obtained by sensors and de- liver instructions to the MRF damper for real-time adjustment of damper force. The performance of suspension system based on MRF damper is obviously improved. A 4D dynamic model has been established for the vehicle suspension system. No-linear random vibration theory is used to discuss how to solve this equation by FPK based on filtered white noise input.