关键词: 燃料电池；储氢系统框架；随机振动疲劳；自由尺寸优化；疲劳损伤值

Abstract: Hydrogen storage system framework of fuel cell is the main structural component bearing hydrogen cylinders and related systems, so the fatigue life of hydrogen storage system framework is particularly important. Fatigue failure of hydrogen storage system framework often occurs in random vibration test. In this paper, modal analysis and random vibration fatigue analysis are carried out on a hydrogen storage system framework of a fuel cell, and it is found that the natural frequencies of X and Y bending modes of the hydrogen storage system framework structure are too low, leading to excessive fatigue damage values of the structure. The free-size optimization method is used to optimize the structure design, which improved the natural frequencies of X and Y bending modes of the structure. Then fatigue damage value of the structure is reduced. The final fatigue damage value of the structure meets the design requirements.

Key words: Fuel cell; Hydrogen storage system framework; Random vibration fatigue; Free-size optimization; Fatigue damage value