Research And Effect Analyse Of Vibration Control Method On Vehicle Active Suspension

The suspension system,an important part of vehicle,directly affects the performance of vehicle like ride comfort and handling stability. The active suspension is able to adjust or produce controlling force between wheel and vehicle body according to road conditions. So it can restrict vehicle vibration and improve the performance of suspension and achieve the purpose of improving ride comfort and handling stability simultaneously.In this thesis,three Control strategy of PID control Fuzzy control and Fuzzy-PID control are designed. Acceleration of vehicle body,dynamic flexibility of suspension and dynamic load of type are evaluated. And then a quarter car mathematical model of two-DOF is built, have been carried out respectively by means of the control simulation software Matlab/Simulink. As a result, dynamic response in time domain can be got.Simulation results show that all different forms of active suspensions can remarkably reduce the vehicle body acceleration,that implies active suspension improves ride comfort well. Also they reduce dynamic flexibility of suspension and dynamic load of type to some extent. That means handling stability is improved a little. Among this three control strategies, the control effect of Fuzzy-PID control is the best.