Study On The Desigh Method Of Dynamic Performance Of High-Speed Train

At the beginning of the high-speed railway development in our country, the high-speed MU trains are manufactured by introducing foreign technology, in which the parameter settings of prototype vehicles are retained. Because differences are existed in both railway development history and design concept of different countries, and thus great differences are carried out in parameter settings and dynamic properties of the imported cars. Japanese representative model CRH2and European representative vehicle CRH3have essential difference on stability, nonlinear bifurcation type for the former is subcritical, while the latter has a supercritical bifurcation, which leads to the big differences in safety, riding comfort and wheel-rail wear of these two modles.The vehicle design concept is directly reflected in the choice of wheel-rail relationship. Wheel-rail matching is the most important bridge connecting Ihe vehicle to the outside world, which will immediately affect the safety and maintenance of the car, and play a critical role in the selection of other vehicle structure parameters. So the wheel-rail matching has been a focus in the study of high-speed railway at home and abroad.Based on the different wheel-rail matching, by using dynamic simulation software SMPACK to creat CRH2and CRH3trailer models, the effect of different structure parameters on dynamic performance of the vehicle system are analysed in this paper. The main job includes:(1) Analyse the contact geometry characteristics of four wheel-rail matching LMA/CHN60, S1002G/CHN60, XP55/CHN60and LM/CHN60. Summarize the characteristics and applicability of various matching.(2) Analyse the comprehensive dynamic performances of CRH2and CRH3under different wheel-rail matching conditions. Study the relationship of vehicle bifurcation stability and other dynamic indexs. Analyze why CRH3can actualize running safety monitoring but CRH2can’t.(3) Analyse the influences of wheel-rail matching, primary longitudinal positioning stiffness and yaw damper on the comprehensive dynamic performance of vehicle system. Summarize the main influence factors for the stability, riding comfort, safety and wheel-rail wear. Put forward effective measures to improve vehicle dynamic performance.(4) Compare the security philosophy of two kinds of models of Europe and Japan, and analyse the implementation measures of these two design concepts from three aspects of wheel-rail matching, primary longitudinal positioning stiffness and yaw damper. Use the Maxwell spring-damping series model explains the influence of yaw damper on vehicle bifurcation characteristic.