燃料电池车氢气辅助系统结构动态特性分析

Dynamic Analysis of Hydrogen Auxiliary System Structure of Fuel Cell Vehicle

通过对燃料电池车氢辅系统独立运行工况下的声振测试及结果分析,初步确定氢泵工作时由于氢气辅助系统箱体结构不合理而导致车内、外振动噪声较大。对箱体结构进行了试验和有限元模态分析。结果表明,箱体存在与振源基频成倍数的模态,氢泵工作时引起板件共振。对箱体结构进行了拓扑优化,在箱体布置了加强筋,箱体的模态频率明显上升且中低频段模态明显减少,避免了氢泵工作时的共振。

According to the result of noise and vibration test of a fuel cell vehicle while hydrogen auxiliary system operated independently,it was confirmed that an improper structure of hydrogen auxiliary system cabinet led to greater noise and vibration both inside and outside of the vehicle. In order to check the existence of the resonance frequency and to optimize the structure of cabinet,a modal test and a finite modal analysis were carried out for the cabinet,which showed that the cabinet had a mode which was multiple of fundamental frequency of the vibration source,and the resonance occurred while the hydrogen pump operating. Based on the cabinet finite element modal,a topology optimization was carried out,depended on which tendons were laid on the cabinet. Compared with the previous consequence,the modal frequency rose and modals at mid and low frequency band decrease markedly,and the optimized cabinet avoided the resonance while the hydrogen pump operating.