关键词: 燃料电池堆；实车路谱；台架耐久试验；疲劳损伤谱；冲击响应谱

Abstract: The main research purpose of this paper is to establish the vibration response characteristics of vehicle fuel cell stacks under actual road conditions and the bench test verification method. Therefore, based on the actual vehicle, the vibration spectra of fuel cell stacks under eight kinds of strengthened bad roads in the test site are collected, and the corresponding fatigue damage spectra of each road surface are calculated respectively. Then, according to Miner damage criterion and the vibration durability target of the vehicle fuel cell stack, the random vibration power density spectrum required by the bench equivalent durability test is obtained, and the 108 h vibration durability test of each axle of eight test sites can be equivalent simulated on the bench. At the same time, in order to achieve the purpose of further accelerated test, the duration of vibration durability test of each axle is compressed to the minimum of 33 h in this paper, and the limit response spectrum generated by power density spectrum of accelerated durability test bench is less than the maximum response spectrum of shock response spectrum of eight test sites, and it is ensured that the fuel cell stack will not produce unrealistic high load when conducting accelerated durability test bench. Therefore, this study proposes a vibration study that can be carried out on the bench under the vehicle working condition, which can effectively reduce the test time.

Key words: Fuel cell stack; Real vehicle road spectrum; Bench durability test; Fatigue damage spectrum; Shock response spectrum