【摘要】 针对裂纹损伤易引发严重后果且难以观测这一问题,对Lamb波传播能量谱结构裂纹检测技术进行了研究。利用Lamb波传播距离远,对微小损伤敏感的特点,对传播路径上不同点观测得到的期望模式Lamb波进行分析,得出其传播距离与能量关系谱,根据能量谱的突变检测出结构损伤的位置。在真实结构试件上进行了实验验证,实验观测得到的期望模式Lamb波传播能量谱反映出结构裂纹的具体位置,证明了该方法的有效性和实用性。更多还原

【Abstract】 Crack damage may cause serious accidents and is hard to be detected intuitively.A new crack damage detection technique based on propagation energy spectrum of Lamb wave was researched.By using its long propagation distance and sensitivity to small damages,the analysis of the expected Lamb waves mode was performed to obtain their propagation energy spectrum.These Lamb waves were collected from different monitoring point along the propagation path.The damage location would be indicated by a sudden change of the energy spectrum.Experimental validation was conducted on an actual structural specimen.The propagation energy spectrum of expected Lamb wave mode observed in the experiments showed the happening and location of the crack damage,which improved the effect and practicability of the method.更多还原