Research On Robust Control Of Vehicle Seat Suspension Vibration Attenuation

Engineering vehicles working condition is usually relatively poor, coupled with the limitations of the performance of the vehicle suspension system. It makes these vehicles’driver always in the vibration of the high strength, and influences the driver’s work efficiency, seriously hurts to the driver’s spine, and directly leads to the disease. In order to reduce vibration to the driver, this thesis usually takes the seat suspension system to isolate vibration, and uses the appropriate control strategies for seat suspension. It can effectively attenuate the vibration caused by uneven ground, reduce the vibration energy passed on to the driver’s body, and improve the drivers’ ride comfort.Magneto-rheological fluid is a kind of intelligent material, which has good rheological properties. It can be the first choice of the semi-active suspension shock absorber material. According to the characteristics of magneto-rheological fluid, it can be made a lot of products which are used in mechanical engineering, civil engineering, etc. The most prominent example is magneto-rheological damper for vibration control in cable suspension bridge vibration, high-rise isolation, etc. In addition, the magnetic fluid rheostat vibration application of suspension system is an important domain, including vehicle suspension system and vehicle seat suspension system. In the suspension of the magneto-rheological damper applications, it is mainly for dissipation produced by the road excitation of vehicle and driver’s vibration energy, to improve the ride comfort. This thesis summarized the present development and utilization of MR damper, and built the modified Bouc-Wen model.This thesis takes semi-active seat suspension control system as the research object based on the magneto-rheological damper. Through the seat suspension research at home and abroad was reviewed and analyzed by contrast after all the semi-active control strategy, this paper chooses a kind of typical highly robustness of nonlinear control algorithm, robust H00control algorithm, and considers the uncertainty of the model and controls input time-delay problem. This thesis works out seat suspension machine first, and then establishes a vehicle seat three degrees of freedom movement differential equation, and translates into including parameter change and controls the state equation and the delay, including control targets and control model. The sufficient condition is transformed into a Linear Matrix Inequality(LMI) problem and the control law is constructed by solving LMI through Matlab. It could provide the reliable theory basis for experimental study on the seat suspension vibration reduction using robust H∞control.Through numerical simulation and comparative analysis of data and charts, the result shows that this design of vehicle semi-active seat suspension robust H∞output feedback controller is effective.