Thermo-structure Coupling Analysis And Optimization Of Traction Vehicle Pneumatic Disc Brake

Air disc brakes were the most important actuators in the brake system of traction vehicle pneumatic.The performance of the brake was directly related to the safety of the tractor.Compared to drum brakes,the overall performance of disc brakes was better,has been widely used in heavyduty automotive industry.The braking process of the tractor type pneumatic disc brake was a multiphysics coupling process,and the coupling process would affect the braking performance of disc brakes,Therefore,it was necessary to study the coupling relationship in the braking process of tractor brake disc brake.In this paper,the research object was the air disc brake of certain model traction vehicle and Thermo-structural coupling analysis was carried on the disc.The main contents were as following:(1)Finite element modeling According to the two-dimensional drawings of disc brakes,the 3D model of pneumatic disc brake w as established by using Pro/E.The air disc brakes were properly simplified without affecting the accuracy,and then the simplified model was imported into the ABAQUS software.Based on the thermo-structural coupling theory and reasonable assumptions,the boundary conditions required for the simulation analysis were calculated.Finally,the model was meshed and the finite element model of the pneumatic disc brake was obtained.(2)Coupling simulation analysis The finite element model of the disc brake was simulated and analyzed,and the simulation condition was the emergency braking condition and long braking process.The simulation results show the changes of temperature field and the stress field in the braking process of tractor brake disc brake.The temperature field exhibited a non-axisymmetric distribution throughout the braking process,The radial and axial temperature difference of brake disc was larger than the circle.The distribution of the stress field was similar to that of the temperature field,and the maximum stress appeared in the area where the brake disc was in contact with the friction plate,and the three-dimensional stress on the surface of the brake disc was shown as compressive stress.During the long braking process,the temperature field of the brake disc gradually changes from asymmetric distribution to symmetrical distribution.(3)Disc Brak e Bench Test Bench test of tractor pneumatic disc brakes was carried out according to the enterprise Q / ZZ 11210-2012 "bench test specification".The temperature data in the braking process of the brake disc were obtained,and the results obtained from the experiment were compared with the results obtained by the simulation,The experimental results are consistent with the overall trend of the simulation results,It can be seen that the finite element model of tractor pneumatic disc brakes established in this paper was reliable.(4)The construction of approximate model Obtained sample data of design variables through optimal Latin hypercube test.Using Isight software,the Kriging model of the maximum temperature,maximum stress of tractor pneumatic disc brakes w ere established.The reliability of the approximate model was analyzed by using the R-Square error analysis method,and the results showed that the established proxy model had high reliability.(5)Optimized design Based on the three approximate models,this paper used the combination algorithm of Adaptive Simulated Annealing(ASA)and sequential quadratic programming algorithm(NLPQL)to optimize the model.The optimization results showed that the maximum temperature had decreased significantly,and the optimization target was achieved,and the performance of the disc brake was improved.