Active vibration control of vehicle suspension.

摘要

Structure-borne noise generated by tire contact on road irregularities is a very important factor in interior vehicle noise. This kind of low-frequency noise can seriously affect the driver's concentration and passenger comfort. In order to reduce this vibration-induced noise, an active vibration control of the vehicle suspension is proposed, as opposed to acoustic noise control. Since modeling uncertainties are inevitable in characterizing the dynamics of the vibration transmission path, robust feedback controllers are considered. In this thesis, an H-infinity robust controller and a mu-synthesis robust controller are designed to reduce the vibrations using actuators acting directly on the suspension. First, closed-loop simulation results are obtained on a quarter-car suspension at the Universite de Sherbrooke, showing a significant reduction in vibration. Second, simulation of the controllers is also conducted on a real car. Closed-loop test results are presented and the effectiveness of the robust feedback controllers is discussed.