采用有效信号段自提取算法识别结构多损伤位置

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.

Identification of structural multiple damage locations using an effective signal automatic extraction algorithm

To identify multiple damage locations in the structure, a method of multiple damage locations identification and imaging was proposed. In this method, the damage index is calculated by using an effective Lamb wave response automatic extraction algorithm. The detected key area in the structure is divided into several subregions, and the effective response signals containing the structural damage information are automatically extracted from the entire Lamb wave responses received by the piezoelectric sensors. Subsequently, the damage indexes of every subregion based on the correlation coefficient are evaluated by using the effective Lamb wave response automatic extraction algorithm. Eventually, the damage locations identification and imaging are performed using the reconstruction algorithm for probabilistic inspection of damage (RAPID). The experimental verification research is conducted using an aeronautic aluminum plate. The experimental results show that the method proposed in this research is capable of identifying multiple damage locations quickly and effectively, as well as imaging the damages in detected area clearly.