关键词: 燃油箱支架；有限元分析；随机振动；疲劳

Abstract: In order to ensure the fatigue strength and reliability of the tank bracket, the finite element method is used to analyze the random vibration of the structure. Firstly, based on the measured acceleration load spectrum, the mode and damping ratio of the simulation model and the actual fuel system are benchmarked to improve the accuracy of the finite element model of the fuel tank assembly, and then the transfer function under unit acceleration is obtained through the frequency response analysis, and finally the random vibration fatigue life analysis of the fuel tank bracket is carried out. The results show that the simulation results of the defective parts are consistent with the structural failure phenomenon, and the fatigue damage and life of the defective parts and the non-defective parts are compared and analyzed, and it can be seen that the non-defective brackets can be reduced in manufacturing cost and weight without further optimization.

Key words: fuel tank bracket; finite element analysis; random vibration; fatigue