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首页>《中国测试》期刊>本期导读>基于导波相控阵全域波束形成及局部时反的损伤定位和量化研究

基于导波相控阵全域波束形成及局部时反的损伤定位和量化研究

128    2019-06-26

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作者:顾建祖, 毕秀祥

作者单位:江苏大学土木工程与力学学院, 江苏 镇江 212013


关键词:导波相控阵;波束形成;时间反转方法;频率-波数域;全域-局部检测


摘要:

为满足结构健康监测在线、实时性的要求,该文提出导波相控阵波束形成全域损伤定位及时反局部损伤量化方法。该方法使用一个混合检测系统,其包括一个用于产生导波的压电陶瓷换能器和用于拾取波场信息的非接触扫描式激光多普勒测振仪(SLDV)。由SLDV逐点扫描组成的相控阵阵列,基于导波相控阵波束的形成和成像算法定位薄板中的损伤位置。然后,将已定位的损伤区域作为目标区域,基于频率-波数(f-k)域时反成像方法对局部区域定量评估损伤。数值仿真和实验结果表明:所提方法能够快速定位损伤区域,并定量评估损伤大小。


Study on damage location and quantification using global phased array beamforming and situ time-reversal method based on guided wave
GU Jianzu, BI Xiuxiang
Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China
Abstract: In order to meet the structural health monitoring online and real-time requirement, a method of global damage localization with guided wave phased array beamforming and local damage quantization by time reversal is proposed. This approach uses a hybrid system consisting of one piezoelectric ceramic transducer that generated ultrasonic guided wave and the no-contact scanning laser doppler vibrometer (SLDV) for acquiring guided wave-field data. The phased array configured by the SLDV scan points one by one in order to inspect and locate the presence of damage in thin-plate based on guided wave beamforming and imaging method. Then the identified damage area is the target area, local regional quantitative assessment of damage is based on the imaging of time-reversal method in f-k domain. The numerical simulation and experimental results show that the proposed method can rapidly locate the damage area and evaluate the size of the damage quantitatively.
Keywords: guided-wave phased array;beamforming;time-reversal method;frequency-wavenumber domain;global-local testing
2019, 45(6):6-12  收稿日期: 2018-01-18;收到修改稿日期: 2018-03-14
基金项目: 国家自然科学基金国际重点合作项目(11520101001)
作者简介: 顾建祖(1961-),男,江苏常熟市人,副教授,硕士,研究方向为超声无损检测
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