Simulation Study On The Dynamic Performance Of Curve Negotiation Of High-Speed EMU

With the improvements of vehicle performance and speed, wheel/rail dynamic performance especially the dynamic performance of curve negotiation has been the focus of railway vehicles dynamics research areas presently, which is an important index to determine the operational security, ride quality, efficiency and cost of railway vehicles directly. It also affects the social and economic benefits of the whole railway transportation.According to the design standards on curve parameter of China high-speed railway and the structure characteristics and technical parameters of high-speed CRH2EMU, the track model, vehicle model and track irregularity excitation model are built in the SIMPACK multibody dynamics analysis software for the nonlinear factors and characteristics in the vehicle system. The vehicle-track dynamic performance on curved track is simulated by using the method of numerical integration.Based on the vehicle dynamics theory, the influence of speed, radius and super-elevation of curve negotiation on the dynamics performance of high-speed EMU is studied. Establishing the dynamic performance simulation of high-speed train track random irregularity excitation model by taking the PSD (Power Spectral Density), the change law of wheel/rail vertical and horizontal force with curve radius value in less super high and super high state is obtained. Furthermore, the simulation parameters on the dynamic performance of curve negotiation in theoretical geometric state and track random irregularity state are compared and evaluated by using the ride quality index. Finally, the optimal radius and super-elevation parameters of curve negotiation are resulted.The influence on the vehicle-track dynamic performance of curve negotiation for different wheels and the wheel/rail matching relationship is discussed. Using the simulation and calculation of the wheel/rail rolling contact creep rates and forces, the optimal wheel tread profile matching China high-speed rail is selected.