Research On Control Method Of High-speed Train Active Suspention Based On MR Damper

With the improvement of modern living standard, people have put forward higher and higher request to the traffic tools. The high speed train is favored by people for its advantages such as quick, comfortable and so on, which make it occupy the core position of the transportation industry gradually. However, with the increase of the speed, the train vibration noise and operation stability is becoming more and more serious. At present, aiming at the vibration problem of high speed train, the active suspension control system based on magneto-rheological damper has achieved good effect of vibration effect, but magneto-rheological damper itself exist hysteresis phenomenon influence real-time control effect of magneto-rheological damper. Therefore, this paper carried out active suspension system vibration control research. The fuzzy PID controller is designed, which can reduce the effect caused by the internal structure perform time delay of magneto-rheological damper and improve the operation stability of the train and ride comfort.According to the structural characteristics and working principle of MR damper, the theoretical mechanical model is established, and the dynamic characteristics of the system are analyzed though SIMULNK simulation software. According to the main reason of train vibration, the vibration signal of the suspension vibration caused by the track irregularity is analyzed and simulated. On this basis, the dynamic model nine degree of freedom train active suspension based on magneto-rheological damper is established which take vehicle body centroid accelerations, nod angular acceleration and rolling angular acceleration parameters as the output of the model. The state space equation is established and the state matrix is solved.On the basis of fuzzy theory, combined with the suspension model established in this paper and the principle of PID parameter setting, the fuzzy control rules are established. PID parameters are adjusted by fuzzy controller to reduce vehicle vibration caused by the track irregularity and negative effect on train performance attributed to time delay. The train suspension system simulation model was established by Simulink software,and the performance of active suspension and passive suspension under different control algorithms and the effect of control strategy on the execution time delay of MR damper are analyzed. The results show that: active suspension system performance is superior to the passive suspension and fuzzy PID control is better than the effect of any single control mode.On the basis of theory and simulation, the suspension system vibration test bench is built,and the test control system is designed to carry out the experiment of two kinds of working conditions. Under different excitation signals and control algorithms, the vibration signalcollected by the measurement and control system is displayed and recorded by the computer,and the vibration response characteristics of the test bench are analyzed. The results show that the experimental results are in agreement with the theoretical analysis results. The experiment verified that the vibration function of the test bench and the feasibility and effectiveness of the fuzzy PID algorithm.