Study On Braking Technology Of A High-speed Train Trailer With Force Thermal Model

With China’s implementation of the sixth large-scale speed, increasing the speed train puts the safety and comfort of train braking forward higher requirements. The braking system as an important part of train especially during emergency braking, it is the only way to brake the train by the friction of the brake disc. It is an important factor that development of the brake disc to restrict train speed and train safety to further improves, so more and more domestic researchers began to work on the braking system.During emergency braking of high-speed train, the brake disk under great heat load. It is the cause that the heat can’t dissipate in a short time to make the surface temperature of the brake disc high. The main reason for failure of the brake disc is the heat load generated by the thermal stress. Therefore, it has a very important theoretical and practical significance with good braking performance of the train speed. Currently, it has focused on the failure analysis or crack analysis on the brake disc. Few people study the braking force. This article imagines this similar to the ABS system to improve the braking force of the train braking performance and increase security.It analyses the braking disc in the high-speed train of 300km/h by finite element analysis software ANSYS12.1. First of all, emergency brake of high-speed train was calculated. According to the structural characteristics of the brake disc, a three-dimensional model was built to analyze the brake plate in the actual loading conditions suffered during braking. Heat-stress indirect coupling method can calculate thermal stress distribution of the brake disc in emergency braking process. Simulation results show that when the time of the emergency braking is 31.6s, the highest temperature is 563℃, and the maximum stress occurs at the rib surface of the corresponding disc. It easily leads to thermal fatigue cracking by the temperature and the stress.With the change of the friction coefficient in the different temperatures, the friction coefficient of the train braking system is optimized. Brake discs and brake torque proposes two options:First, always keep the braking force unchanged; two is the similar to the ABS system through the use of braking torque. By contrast with the previous results, Option One shorter braking distance but compared to the brake disc temperature 50℃, while in the Option II braking distance and braking time is similar, but the overall temperature of the brake disc is effectively reduced, but also increases the time of the system dynamic disk, improves train safety. It is to provide enhance the braking performance provided some reference.