Research on structure optimization of a subway vehicle battery box

FAN Zhi-min, ZHAO Zi-lian
(College of Mechanical and Electrical Engineering, Qingdao University
of Science and Technology, Qingdao 266061, China)

Abstract: Aimming at the problem that the light weight of on-board equipment is urgently needed due to the trains have been speeding up in recent years，the structural strength, fatigue strength, modality and three structural optimization methods of a subway vehicle battery box were studied.The topology optimization variable density method and the application of single-objective and multi-objective optimization methods in rail vehicles was proposed. The optimization method based on topology optimization, size optimization and shape optimization based on variable density method was proposed. Based on the theory of structural optimization design and the optimization software of Optistruct, the optimization analysis of the box body was carried out. The optimized cabinet was tested using the fatigue data system. The results indicate that the optimization method achieves a weight reduction of about 31.5% for the frame structure, and the static strength satisfies the allowable stress value of the material. The first-order natural frequency increases to 20.7 Hz, and the fatigue damage value is less than 0.7, which realizes the maximum weight reduction of the structure. The method provides a useful reference for the lightweight design of other types of vehicle equipment.
Key words: battery box; structure optimization; topology optimization; variable density method; lightweight