Research On Temperature Field Of High-Speed Train Brake Disc And Wear Characteristics Of Brake Pad Under Wheel-Rail Excitation

As the operating speed of trains continues to increase,higher requirements have been put forward for the braking technology and safety performance of trains.The brake disc is an important component of the train braking system.During the emergency braking process,the wheel-rail excitation caused by rail corrugation may induce fatigue damage to the brake disc,directly affecting the braking performance of the train braking system.Therefore,this paper takes a certain type of high-speed train braking device as the research object,and uses finite element simulation software to study the influence of wheel-rail excitation on the temperature distribution of high-speed train brake discs and brake pad contact surface wear under actual service conditions,the main research contents are as follows.Firstly,a high-speed train dynamics model was established by using dynamic simulation software.Under the action of rail corrugation,the emergency braking process of the brake disc was simulated and analyzed.The vertical and lateral vibration amplitudes of the brake disc under different braking conditions were analyzed,and the vibration amplitudes were used as boundary conditions for the subsequent research of the effect of wheel-rail excitation on the temperature distribution of the brake disc and brake pad surface wear.Secondly,a 3D model of the brake disc was established based on the actual dimensions.In order to improve the efficiency of finite element simulation analysis and save simulation time,the model structure was simplified and imported into the finite element simulation software.The model was meshed,the relevant parameters of the simulation analysis were set,the load and the corresponding boundary conditions were determined,and the finite element simulation model of the brake disc was established.On this basis,considering the wheel-rail excitation caused by rail corrugation,the thermalmechanical coupling process of the brake disc was simulated by ABAQUS finite element software,and the influence of wheel-rail excitation on the temperature distribution of the brake disc during the emergency braking process was analyzed.Different nodes in different directions of the brake disc were selected and the temperature change curves of the nodes were compared and analyzed with and without wheel-rail excitation.The brake discs under different braking conditions were simulated using the control variable method,and the effect of wheel-rail excitation on the temperature distribution of the brake discs was analyzed.Finally,based on the thermal-mechanical coupling finite element model,the model was redeveloped based on Archard linear wear theory and ALE mesh adaptive technology.Considering the wheel-rail excitation caused by rail corrugation,the brake pad wear process was simulated and the influence of wheel-rail excitation on the wear distribution of the brake pad contact surface was analyzed.Different nodes in the radial and circumferential directions of the contact surface of the brake pad were selected and the wear change curves of the nodes with and without wheel-rail excitation were compared and analyzed.The wear of the brake pad under different braking conditions were simulated using the control variable method,and the effect of wheel-rail excitation on the wear distribution of the contact surface of the brake pad was analyzed.