VIBRATION-THERMAL-MECHANICAL COUPLING CHARACTERISTICS ANALYSIS OF THE BRAKE DISC IN HIGH-SPEED TRAINS

Since the service performance of the brake disc is easily affected by wheel-rail excitation, this paper comprehensively considers the external factors that affect the service characteristics of the brake disc and carries out the vibration-thermal-mechanical coupling analysis of the brake disc under the full-service braking conditions and emergency braking conditions. First of all, the vibration characteristics of the brake disc under two working conditions considering track irregularity excitation are analyzed by using Simpack software, and then the thermal-mechanical coupling simulation analysis with or without wheel-rail excitation is carried out to obtain the temperature field and stress field of the brake disc under vibration. The results show that the track irregularity excitation has a continuous effect on the braking process of the brake disc under two working conditions, and the acceleration of three-dimensional vibration tends to decrease with the decrease of vehicle speed, and the vibration of the brake disc is transmitted by the axle. Compared with no excitation, the track irregularity excitation will increase the maximum temperature and the maximum equivalent stress of the brake disc by 0.12% and 0.46% under the full-service braking conditions, and 0.68% and 2.44% respectively under the emergency braking condition. With or without excitation, the appearance of the maximum temperature of the brake disc always lags behind the maximum equivalent stress in the braking process. The conclusion of the analysis provides a certain reference basis for the improvement of the service performance and structure optimization of the brake disc in high-speed trains.