Plate-like structure damage location identification based on Lamb wave baseline-free probability imaging method
Plate-like structure damage location identification based on Lamb wave baseline-free probability imaging method
复制标题
基于Lamb波无基线概率成像方法的板状结构损伤位置识别
DOI：
10.1177/1687814016685702
复制
发表时间：
2017-01-01
影响因子：
2.1
通讯作者：
Jin, Mengdao
中科院分区：
文献类型：
--
作者：
Li, Dongsheng;Jing, Zihao;Jin, Mengdao
利用传统的超声导波损伤检测技术提取损伤散射信号需要在原始状态下测量基线数据。基于兰姆波无基线概率成像方法，提出了一种无基线超声导波损伤定位成像方法。虽然传统的兰姆波概率成像可以监测板状结构中的损伤位置，但信号的绝对到达时间和幅度受多种因素的影响，因此难以获得。本研究亦提出一种基于概率的双曲线诊断成像方法，该方法是基于不同的到达时间，且不需要震级信息。提出了一种基于脉冲回波结构和时间窗函数的分布式主动传感器网络，用于从结构响应信号中分离损伤散射信号。利用连续小波变换计算损伤信号波的渡越时间。数值仿真和实验验证了该方法在损伤识别中的有效性。
Damage-scattering signal extraction using conventional ultrasonic guided wave-based damage detection techniques requires the measurement of baseline data under pristine condition. This study proposes a baseline-free ultrasonic guided wave damage localization and imaging method based on Lamb wave baseline-free probability imaging method. Although traditional Lamb wave probability imaging can monitor damage location in plate-like structures, the absolute time of arrival and magnitude of the signal are affected by several factors and are therefore difficult to obtain. This study also proposes a probability-based hyperbola diagnostic imaging method that is based on different times of arrival and has no magnitude information. A distributed active sensor network conforming to a pulse-echo configuration and time window functions is developed to separate damage-scattering signals from structural response signals. Continuous wavelet transform is used to calculate the time of flight of damage signal waves. The numerical simulation and experiments validate the effectiveness of the proposed method in identifying damage.