The Numerical Simulation Research on Judgment of Lateral Motion Stability of the Vehicle System

The limit cycle method,frame acceleration magnitude method,frame and acceleration mean square root method are used to make the judgment of lateral motion stability.The result shows that the critical speed obtained through judgment with the frame acceleration magnitude method is higher than that obtained with the limit cycle method,and the critical speed obtained through judgment with the frame and acceleration mean square root method is often lower than that obtained with the limit cycle method at high speed.For the frame acceleration magnitude judgment method specified in TSI L 84-2008,through simulation analysis,the filtering frequency of 3 Hz~9 Hz is suggested to be changed into 2 Hz~9 Hz to cover the hunting instability frequency,so as to make the judgment result be more accurate.In the end,the derailment safety and ride comfort after the hunting instability of high speed cars are analyzed.