Influence of Running Speed on the Development of Metro Wheel Polygon

This paper makes a more in-depth study on the relationship between vehicle running speed and the development of wheel polygon when the wheel has an initial polygon. Firstly, in order to highlight the research focus and ignore the secondary factors, the vertical coupling vibration model of vehicle and track is reasonably equivalent simplified, and the wheel polygon vertical vibration model is established. Then, in order to obtain the variation of wheel longitudinal creep wear on the wheel circumference and the development trend of wheel polygon, the mathematical model of wheel/rail longitudinal creep wear under alternating normal force is established. By calculating the wear power of each point on the wheel circumference at different speeds, the phase relationship between the wear power distribution curve and the wheel radial jump curve is obtained. The simulation results show that, speed can change the distribution of wear power on the wheel circumference, and have a certain impact on the amplitude and phase of wear power. According to the phase relationship, the corresponding speed range can be obtained, and the train running in this speed range can inhibit the deterioration of the initial polygon.