Design Of Semi-active Controllers For Vehicle Vibration Based On MR Damper

With the development of the society, the ride comfort and driving stabilization of vehicle become increasingly important. Therefore, the semi-active suspension technol- ogy of vehicle receives the comprehensive attention in the fields of academe and industry.Semi-active suspension usually uses a damper which can be controlled to change the system damp. Magnetorheological (MR) damper is a new-style damper which can be controlled. It has the characters of small bulk, big force, swift response, high security and so on. Even if the control is disabled, MR damper still can be used as a passive damper.First, the appropriate land model is developed based on practical road profile. The appropriate mathematiced model of MR damper is established in accordance with its non-linear characteristics. For semi-active control of vehicle vibration, the mathema- ticed models of a quarter vehicle and a half vehicle with MR damper are developed respectively.The most significant problem in the design of semi-active suspension with MR damper is appropriate control methods'selection. With the satisfaction of the ride comfort and driving stabilization of vehicle, three controllers have been developed in this thesis, including: the static output feedback (SOF) controller for semi-active control of vehicle suspension system via iterative linear matrix inequality (ILMI) algorithm, the fuzzy controller for semi-active control of vehicle suspension system via micro genetic algorithms (μGA), the PID controller for semi-active control of vehicle suspension system via ILMI algorithm. In the established models and the designed controllers, we take into account the uncertaining of the suspension system. Numerical examples demonstrate that with a proper control strategy semi-active suspension with MR damper can improve both the ride comfort and driving stabilization.