Parameters Optimization Of High Speed Train Lateral Damper And Semi-active Control Study Based On HIL

With the train speed improving continuously,the excitation amplitude and frequency between wheel and rail are both changing.Once the old suspension system can not adapt to this change,there will be bad dynamic phenomena,and the deterioration of train running quality will come first.Therefore,it is necessary to take effective measures to suppress the car body vibration and improve the dynamic performance of the vehicle system.At present,the suspension parameter optimization and the active/semi-active control are the common main methods to suppress the car body vibration.Suspension parameters optimization can reduce vehicle vibration and improve operation quality within a certain range,but it has great limitations due to some factors such as speed and line conditions.The active/semi-active control of suspension system can adjust the damping force or damping coefficient adaptively according to the train running condition,so as to suppress the vibration of vehicle body.From the viewpoint of reducing energy consumption,semi-active control is a hot research topic in recent years.It can get the effect close to active control with very little energy consumption.In order to make a comparative analysis,the parameters optimization and semi-active control of the lateral damper of suspension system are studied in this paper,and the theoretical results are verified by experiment.The main research contents of this paper include:(1)The 17 degrees of freedom transverse vehicle model is established based on Matlab/Simulink.In the model,the nonlinear characteristics of wheel rail creep and suspension system are taken into account;Based on this model,the influence of nonlinear factors and equivalent taper on the vehicle lateral stability is analyzed;Then taking the stationarity and stability of vehicle system as the optimization objective,the nonlinear parameters of lateral damper are optimized based on genetic algorithm.It is found that the optimization of suspension parameters can improve the running quality of the train to a certain extent,but the effect is limited.(2)The experiment of magnetorheological damper(MRD)is carried out under different current and excitation conditions.The hardware in the loop(HIL)experiment platform for semi-active control of high-speed train suspension system is built,and the effectiveness of the experimental platform was verified by 1/4 vehicle suspension model.(3)The effect of passive control,skyhook control and SH-ADD control,in restraining the lateral vibration of the car body,is compared and analyzed by the HIL experiment system.