论文部分内容阅读
为识别结构中的多处损伤,提出了一种采用有效Lamb波信号段自提取算法计算结构损伤指标的多损伤识别成像方法.该方法将结构的待检测区域划分为数个子区域,并根据Lamb波的传播时间和波速从传感器接收到的信号中自动提取出包含结构信息的有效信号.以该有效信号作为输入,计算每个子区域中基于信号相关系数所获得的损伤指标,最后采用RAPID算法对全部识别区域内的损伤位置进行识别和成像.以航空铝板为研究对象进行了实验验证研究,结果表明,该方法能快速有效地识别出多个损伤,并较为准确地实现损伤成像以描述损伤的位置.
In order to identify multiple damage in the structure, a multi-damage identification imaging method based on self-extracting algorithm of effective Lamb wave signal is proposed, which is divided into several sub-regions according to Lamb wave Of the propagation time and velocity of wave from the signal received by the sensor automatically extract the effective signal containing structural information to the valid signal as input to calculate the damage index obtained in each sub-region based on signal correlation coefficient, and finally using RAPID algorithm for all Identification and imaging of the damage location in the recognition area.An experimental study on the aluminum plate is carried out.The results show that this method can identify multiple lesions quickly and effectively and can accurately describe the damage location .