Abstract
A suspension of a vehicle is the support system between a vehicle body and wheels.The task of a suspension is to support the vehicle body and develop ride comfort.But if the attenuation force becomes large, the passenger will feel hard at high frequencies If the attenuation force becomes small, the passenger will feel soft at low frequencies.If the coefficient of spring becomes low the vehicle's naturel frequency of vibration becomes low,thus the heave,rolling and pitching will become large. In this study, a new method has been proposed.A non-linear seven degrees of freedom vehicle model is used in order to design and check the performance of sliding mode controlled active suspensions.From this basement the active suspension control input can be obtained,but in the semi-active suspention systerm the control input force can not be used directly.There are many restrictions on dampers.Putting restrictions on the active control input force one can realize the semi-active control.Experiment results are presented to confirm effectiveness of this new algorithm.
