基于环形阵列的空间滤波器结构损伤扫描监测方法研究  

Research on the spatial filter structure damage scanning monitoring method based on circular array

作　　者：常琦[1] 徐勇 赵恒[1] Chang Qi;Xu Yong;Zhao Heng(School of Mechanical and Precision Instrument Engineering,Xi′an University of Technology,Xi′an 710048,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,西安710048

出　　处：《仪器仪表学报》2024年第1期221-229,共9页Chinese Journal of Scientific Instrument

摘　　要：本文提出了一种基于环形阵列的空间滤波器结构损伤扫描监测方法,在结构中央布置环形压电传感器阵列实现对结构的全方位扫描监测,消除了主动Lamb波空间滤波器监测方法中盲区及远场对监测效果的影响。环形阵列由直径方向不同角度的4个线阵组成,每个线阵采用主动Lamb波空间滤波监测方法对结构损伤进行监测、成像,各阵列成像结果通过PCA-小波变换进行融合对损伤位置进行判别,从而实现结构全方位损伤扫描监测,消除单个阵列损伤监测的盲区、远场及虚假成像等影响,进而获得更加准确的损伤监测结果。通过实验研究,验证了该方法的有效性和实用性。In this article,a spatial filter structure damage scanning monitoring method based on the annular array is proposed.The annular piezoelectric sensor array is arranged in the center of the structure to realize the omnidirectional scanning monitoring of the structure,which eliminates the influence of the blind area and far field on the monitoring effect in the active Lamb wave spatial filter monitoring method.The circular array consists of four linear arrays with different angles in the diameter direction.Each linear array uses the active Lamb wave spatial filtering monitoring method to monitor and image the structural damage.The imaging results of each array are fused by the PCA-wavelet transform to identify the location of damage.Thus,the omnidirectional damage scanning monitoring of the structure is realized,and the blind area,far-field,and false imaging of single array damage monitoring are eliminated.Then,more accurate damage monitoring results are obtained.The effectiveness and practicability of the method are verified by experimental research.

关 键 词：LAMB波 空间滤波器 损伤扫描监测 多阵列成像融合 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3