【摘要】 针对车用高压储氢容器的复合纤维缠绕结构在其使用过程中的安全问题,开展了体积为0.074m3车用纤维缠绕储氢容器的模态试验研究。根据完好容器、反复充装引起的桶身轻微损伤和疲劳破裂两种疲劳损伤状态容器的模态分析,探讨了基于模态参数进行损伤识别的可行性。研究表明,无论是轻微损伤还是疲劳破裂状态,局部的疲劳裂纹对损伤前后的频响函数有一定影响但并不敏感,无法基于频率响应函数判定损伤是否发生并确定损伤位置,但基于损伤前后振型比较可以实现损伤判定并预测损伤位置。该研究为确定车用储氢结构的在线损伤识别奠定了实践基础。更多还原

【Abstract】 In order to investigate the safety issues of a fiber composite wrapped tank for automobile hydrogen on-board storage during the operation process,the modal tests of 0.074m3 fiber composite wrapped tanks are carried out.Using the dynamic parameters of the intact,slightly damaged,and fatigue-cracked tanks caused by repeated hydrogen filling,the feasibility of damage detection of fatigue cracks in fiber composite wrapped tanks is analyzed.The test results indicate that the localized fatigue cracks have some effects on the frequency responses of slightly damaged and fatigue-cracked tanks,but the effects are not significant.Therefore,the frequency response function cannot be used to detect the extent of damage or the crack location in a fiber composite wrapped tank.However,a method based on modal shape is a potential way to detect and locate possible damage.These test results and analyses provide guidance on the online damage detection of high-pressure hydrogen storage tanks in automobiles.更多还原