The Research Of The Vehicle Suspension Semi-Active Control Based On The Magnetorheological Damper

With the continuous improvement of society, the demand of the vehicle ride comfort is increasing higher. The suspension system is an important component that can influence the vehicular comprehensive performance. The semi-active suspension has the real-time control function according to the state of vehicle’s motion and the road conditions.So the application is an important approach to advancing the vehicle’s comfort.MRD provides a new way for the application and development of semi-active suspension damper.MRD semi-active control suspension applies the MR technology to reach the real-time control of its damp. Due to the good controllability,rapid response speed and comparatively simple structure,MRD semi-active suspension has become one of the central research subjects in semi-active suspension field.The purpose of the study is to improve the effect of reducing vibration acceleration and the vehicle’s adaptability to different roads, especially to improve the vehicle ride comfort. And analysis the influence of vehicle ride comfort based on different suspensions.The meaningful contributions of the dissertation include the followings:(1) Review the technology development and research status about the automotive suspension at home and abroad. And analysis the vehicle magnetorheological damper research status and problems.(2) Complete the modeling of the two suspensions and the full vehicle model in Adams/Car,and set up the damp attribution of suspension model by changing the linear damper to magnetorheological damper.(3) Deduce the damping force formula of MR damper in mixed mode and built the model of MR damper in Matlab/Simulink,and conduct the simulation and analysis the change of damping force under the different conditions.(4) Built the PID control model of the whole vehicle in Matlab/Simulink.(5) Create the co-simulation input and output variable and generate the Adams_sub model and connect all the model.And conduct the simulation to control the acceleration of vehicle vibration.(6) According to the results,compare the results pointing at the different performance evaluation index about the vehicle to analysis the adaptability of the full vehicle with different suspension on different roads and evaluate the vehicle ride comfort.In this study, compared with the passive suspension, the ride comfort of semi-active suspension full vehicle with magnetorheological damper control is better. The shock absorption effects of the different automobile suspensions that applied different semi-active control system are different.