Stability analysis of high speed trains based on active anti-yaw damper control with electro-hydraulic actuator

As the speed of high-speed trains increases, hunting motion has become a critical issue threatening vehicle stability and safety. This paper proposes an active anti-yaw damper control strategy based on an Electro-Hydrostatic Actuator (EHA). A high-speed train vehicle dynamic model and a simplified mathematical model of the EHA were established on the Simpack and Simulink platforms. The EHA was employed as an active anti-yaw damper actuator, controlled by a fractional-order proportional-integral-differential (FOPID) controller. The weighted sum of the root-mean-square (RMS) values of the lateral accelerations of the carbody and bogie was used as the optimisation objective. The Particle Swarm Optimisation (PSO) algorithm was applied to obtain the optimal parameters. Through co-simulation, the vibration suppression effect of this control strategy under primary and secondary hunting motions, and its robustness under various track excitations, were validated. Under the active control, the RMS value of the bogie lateral acceleration decreased from 5.61 m/s2 to 4.22 m/s2, and the nonlinear critical speed of the vehicle increased from 556 km/h to 652 km/h. This paper demonstrates the potential of EHA-based active anti-yaw damper control to improve the hunting stability of high-speed trains, and provides a reference for high-speed train stability control.