Abstract:In order to improve the structural strength of high-speed train gearbox and avoid failure due to insufficient strength,the static and dynamic analysis for a certain type of high-speed train gearbox box was carried out by using the finite element analysis method.Through the analysis,it is concluded that the main reason for the failure of high-speed train gearbox box is that the structural design of the gearbox box of high-speed train is unreasonable.Based on the variable density method,a topology optimization model was established,in which the minimum structural compliance of the gearbox box of high-speed train was taken as the optimization objective function and the stress and volume of the gearbox were constrained;the static and dynamic analysis of the optimized box were carried out,and compared with the box before optimization.The results show that the performance of the optimized box was enhanced and its quality was reduced.Based on the parallel axis theorem,the bending stiffness of the gearbox before and after optimization was calculated,and the performance was consistent with the finite element simulation.Compared with the unoptimized high-speed train gearbox structure,the first-order natural frequency of the optimized structure is increased by 35.29%,the maximum stress is decreased by 0.73 MPa,the maximum deformation displacement is reduced by 0.003 mm,the mass is reduced by 11.86% and the bending stiffness is increased by 0.5%,and the mechanical properties of the gearbox are improved.