Key Components Of Vehicles In Urban Rail Transit Brake Thermal Fatigue Simulation Research

With the accelerated process of urbanization in China, the traffic jam hasbecome a pressing problem. The construction of urban rail transit is regarded asthe backbone network of urban public transport network, which has becomerecognized in the world to solve this problem. Urban rail transit has shorterstation distance and brakes frequently; therefore high demand is put forward onthe vehicle’s braking ability. Moreover, urban rail transit regard the high speedand over loading as the development direction.The speed of domestic urban railvehicles is relatively low. In order to improve operating speed, the key issue is tosolve the brake problem.In this paper, the research status about thermal fatigue of the tread brakeand brake disc brake is analyzed to determine the research program. The thermalfatigue simulation of vehicles’ key components of foundation brake in theemergency braking condition is focused mostly, which can provide a theoreticalbasis for the wheel optimization and choice of brake mode.Based on the heat transfer theory, simulation analysis is conducted for thetemperature field and thermal stress field of the domestic model vehicles’ wheelsin the tread brake at the speed of120km/h. First, the energy conservation is usedto determine the wheel input heat flux. On the basis of determining the boundaryconditions and load cases, the finite element model of the wheels is researched.At last combing the static load analysis of the vehicles and axle contact analysis,comprehensive assessment is made to evaluate the fatigue strength of the wheel.Reference to thermal fatigue analysis step of the wheel, brake disc isconducted simulation study. First, the friction power is used to determine inputheat flux of the brake disc, and heat conduction model and finite elementanalysis model are established. The ANSYS software is used to conduct thesimulation analysis of the temperature field and thermal stress field of the brakedisc. The results are made contrast with1:1brake experiment station, which canshow that the simulation results are close to reality. Finally, the heat lossmechanism of the brake disc is discussed，brake disk dangerous point of fatigue life calculation based on the creep damage model.