Research On Dynamic Performance Of 30t Axle Load Heavy Haul Wagon

With China’s economic development, the railway transportation capacity becomes an issue, in order to address this situation, heavy axle load of a freight train has been in research and development in China. The increase in freight train axle led to growing interaction between wheel and rail, track abrasion becomes serious, smoothness and curving of security of trains has been challenged. For these reasons, improving the dynamic performance of heavy haul freight train is an important link in the process of problem-solving.In this paper, heavy-haul freight train has been carried on the detailed research, analyzes its structure and suspension modes. Considering the current several kinds of dynamic performance evaluation index methods. Established simulation model of it by using multi-body dynamics software SIMPACK. Simplified some ways of nonlinear suspension in the model. Simulation calculated the dynamic performance of haul freight train in unloaded and loaded. Then also calculated the influence to dynamic performance caused by the primary suspension parameters of the train. Finally calculated the vehicle dynamics performance under several kinds of different track conditions.The results show that the nonlinear critical speed in the cases of unloaded is less than loaded condition; when running on a straight line, lateral is under the condition of poor, but vertical stability of unloaded train is less stable. When running on the curve, the loaded train has a larger force between wheel and rail than the unloaded train. Reasonable selecting the appropriate longitudinal, lateral and vertical stiffness of the suspension can make overloaded trucks have more excellent performance. Increasing the radius of the curve line is very beneficial to curve passing dynamic performance of the vehicle, but must note that ultra-high of the different speed through many different radius curve is different. Excessive ultrahigh will make the train easy to overturn, too small super high will make the wheel/rail force increases, too small ultrahigh can make the wheel/rail interactions increase, and make the abrasion become intense. In order to make the actual operation of the vehicle have a good performance in various line conditions, we need to select the reasonable line ultrahigh and length of transition curve.