Vibration Performance of High-Speed EMU'ss Power Wheelset

Abstract

To study the lateral and vertical vibration performance of high-speed electric multiple unit cars (EMU) power wheelset axle box, the vehicle-track system dynamics models were established in SIMPACK software. The wheelsets' structures were considered as rigid bodies and flexible bodies respectively in the dynamics models. The vehicles ran in straight line at speeds of 200, 250, 300, 350, and 400km/h respectively in the simulation, and the maximum vibration acceleration in lateral and vertical and the acceleration's root mean square value at different speeds were obtained. The results show as follows: The lateral vibration acceleration of the non-leading wheelset is larger than the one of the leading wheelset. The vertical acceleration of the non-leading wheelset doesn't appear to be much different from the one of the leading wheelset. The ratio of the axle-box lateral vibration acceleration's root mean square value of the non-leading wheelset to the leading wheelset is 1.38, and the ratio of the maximum lateral vibration acceleration of the non-leading wheelset to the leading wheelset is 1.37 if the wheelsets are supposed to be rigid bodies and the vehicle runs at a speed of 350km/h. As speed increases, the difference of axle-box vibration acceleration in vertical and lateral between rigid wheelset and flexible wheelset also increases. The ratio of the axle-box lateral vibration acceleration's root mean square value of the flexible wheelset to the rigid wheelset is 1.55 and the ratio of the axle-box maximum lateral vibration acceleration of the flexible wheelset to the rigid wheelset is 1.44 when the vehicle runs at a speed of 400km/h. The 1st symmetric bending mode has the most impact on both the vertical and lateral vibration acceleration.