关键词: 高速动车组, 轻量化, 多功能车体间外风挡, 车体间纵向减振器, 车辆动力学

Abstract: In order to enhance the inter-vehicle coupling, high-speed EMUs were usually equipped with inter-vehicle longitudinal dampers at the car end. However, the large size and high cost of these dampers were in contradiction with the demands for lightweight, easy-to-operate, high-performance and achievable vehicle-end coupling systems in future high-speed EMUs. In response, a multi-functional inter-vehicle external vestibule diaphragm device was proposed, which had the functions of the traditional external vestibule diaphragm to reduce noise and air resistance and to protect against rain and snow as well as had the characteristics of stiffness and damping that might replace the inter-vehicle longitudinal dampers, playing the role of inter-vehicle vibration damping. The numerical simulation model of the sub-unit structure of the multi-functional inter-vehicle external vestibule diaphragm was established based on the operating principle, and the number of the sub-units when the multi-functional inter-vehicle external vestibule diaphragm might be equivalent to the damping function of the inter-vehicle longitudinal dampers was determined by comparing the dynamic characteristics parameters of the sub-units with those of the inter-vehicle longitudinal damper under the same working conditions. Finally, the dynamic co-simulation of the numerical simulation model of the multi-functional inter-vehicle external vestibule diaphragm and the high-speed EMUs dynamic model were carried out by using Simulink. The influences on the dynamic performance of the vehicles without an inter-vehicle damping device, equipped with the inter-vehicle longitudinal dampers and equipped with the multi-functional inter-vehicle external vestibule diaphragm were compared. The results show that compared with the inter-vehicle longitudinal dampers, the multi-functional inter-vehicle external vestibule diaphragm may further reduce the amplitude of yaw angle displacement of the carbody and the amplitude of lateral vibration acceleration of the carbody, suppress the yaw vibration of the carbody more efficiently, and further improve the lateral ride quality of the vehicle running.

Key words:  , high-speed electric multiple unit(EMU), lightweight, multi-functional inter-vehicle external vestibule diaphragm, inter-vehicle longitudinal damper, vehicle dynamics