Study on the thermal-structural coupling method for disc brake of high-speed train
The thermal load calculation of disc brake is a key link in the development and design of high-speed train brake disc,and its calculation results are used as the basis to determine the train operation parameters.Developing suitable calculation methods and establishing a thermal-structural coupling calculation model with high calculation accuracy and wide applicability of working conditions is the key issue of the thermal load calculation of disc brakes.In view of the braking process of axle mounted brake discs for multiple units,the displacement gradient cycle method was proposed by considering the geometric characteristics,motion characteristics and load conditions of brake pads and brake discs.Based on the ABAQUS® software program,a three-dimensional transient heat transfer finite element(FEM)model of disc brake friction pairs was established,and the heat flow loading formula was derived by using the displacement gradient cycle method,which was helpful in calculating the friction heat flow generated in the braking process and solving the coupling result deviation caused by the friction effect along the circumferential difference of the brake disc.The displacement gradient cycle method was used to analyze the thermal-structural coupling of the brake disc.The statistical indicators,such as the peak temperature error rate and correlation coefficient,of the comparison between the simulation results with the test data and the field survey results were used to evaluate the calculation accuracy and working condition applicability of the model.The analysis results show that the thermal-structural coupling model based on the displacement gradient cycle method can effectively simulate the temperature change law of the brake disc during the braking process,and have good repeatability and stability.The brake disc hot crack failure prone location discovered by the structural field is consistent with the loading and operation of the brake disc of the same type.The research results can effectively simulate the thermal-structural coupling process of the brake disc when the high-speed train applies braking,and its advantages are reflected in the condition of continuous braking or interval braking under heavy axle load.The calculation accuracy would not decrease even if the braking time is very long.
high speed traindisc brakethermal-structural couplingthermal load calculationdisplacement gradient circulation method
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