Suspension parameters design for robust and adaptive lateral stability of high-speed train

An adequate hunting stability margin is required through the optimisation and matching of bogie suspension parameters for high-speed trains. Moreover, the dynamics design is particularly important for the robust lateral stability to adapt to wheel-rail wear and track deformation. The hunting stability margin of vehicles, as well as the wheel-rail contact state adaptability should be taken into account. In this regard, the robust hunting stability Pareto optimisation of bogie suspension parameters for different wheel-rail wear stages is executed. A method for the centralised optimisation of key bogie suspension parameters based on vehicle lateral robust stability is presented, and the principle of two typical parameters matching for high-speed vehicles is summarised. In addition, in order to make the vehicle automatically adapt to different wheel-rail geometry contact states without any sensors and control systems, a new idea of frequency-dependent stiffness (SDF) of yaw damper is proposed to ensure the lateral stability margin especially in extreme wheel-rail contact states, which is verified through the vehicle linear system stability and ride comfort comparative analysis. Finally, the adaptive stabilisation mechanism of the vehicle with the frequency-dependent stiffness of yaw damper is clarified.