Research On Active Stability Of High-speed Train Based On Frame Lateral Vibration Control

With the constant improvement of the running speed and the mileage,high-speed trains has exposed more and more dynamic problems.It may be difficult to fulfil all the running requirements using traditional passive bogies.Hence various active control systems and strategies have been researched to influence the vehicles dynamic behavior under extreme working conditions.In this paper,an active control scheme is proposed for high-speed trains based on frame lateral vibration,which includes the inertial actuators on the front and rear frames of the bogie.The hunting stability and the running performance on straight track are improved through active control force generated by inertial actuators.The scheme has the advantages of good control effect,convenient installation and structural feasibility.Firstly,a simplified lateral vibration model of a single bogie is established.The dynamic model is found to have 3 rigid bodies and 6 degrees of freedom.Considering the controllability and observability of the entire control system,a frame vibration subsystem is divided.The frame lateral vibration is suppressed by feedback the vibration state,which improves the lateral dynamic performance of the bogie.The bogie hunting stability is improved through the active control scheme based on frame lateral vibration improves,which is verified by a rolling test rigA multi-body dynamics model of the vehicle with different treads and rail base slopes is established in SIMPACK.The linear stability and non-linear stability and the running performance on straight track are analyzed under different coefficients and operating conditions based on the feedback of the frame lateral vibration displacement and lateral vibration velocity,respectively.The results show that the two kinds of active control schemes can affect the dynamic performance of the vehicle,but the degree of control effect is different.For the secondary-hunting,the linear stability of the vehicle is improved through the above control schemes.The non-linear stability is improved in fault state based on the feedback of the frame lateral vibration displacement.It's also improved in worn tread and fault state(a yaw damper is disable)based on the feedback of the lateral vibration velocity.For the primary-hunting,the control scheme based on the feedback of the lateral vibration displacement can effectively suppress carbody roll and improve the stability of the vehicle.In addition,the two control schemes can improve the running performance on straight track in the fault state.However,the control scheme based on the feedback of the lateral vibration displacement is more effective in other working conditions.Finally,a gain matrix including the feedback of the frame lateral vibration displacement and velocity is obtained by LQR control method,which is applied to the simulation analysis.Based on this,the influence of natural frequency,damping ratio and mass of inertial actuator on control effect is studied.The results show that the gain matrix K obtained by the LQR control theory can effectively improve the linear stability and nonlinear stability and the running performance on straight track of the vehicle.The natural frequency of 1~2 Hz,the damping ratio of 0.3,and the mass of 200~250 kg should be adopted as actuator parameters,which can achieve excellent control effect and more realistic.