基于深度学习和导波阵列的高精度损伤成像方法  

High-precision imaging method of damages via guided wave arrays and deep learning

作　　者：许伯强[1] 邱彤彤 岳圣尧 徐晨光[1,2] 徐桂东[1] 沈荣和 张赛[1,3] XU Baiqiang;QIU Tongtong;YUE Shengyao;XU Chenguang;XU Guidong;SHEN Ronghe;ZHANG Sai(Institute of Ultrasonic Testing,Jiangsu University,Zhenjiang 212013,Jiangsu,China;Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,Jiangsu,China;State Key Laboratory of Dynamic Testing Technology,North University of China,Taiyuan 030051,Shanxi,China)

机构地区：[1]江苏大学超声检测研究所,江苏镇江212013 [2]江苏大学土木工程与力学学院,江苏镇江212013 [3]中北大学省部共建动态测试技术国家重点实验室,山西太原030051

出　　处：《陕西师范大学学报（自然科学版）》2022年第6期17-29,共13页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(62071205,62271235,61927807);中北大学省部共建动态测试技术国家重点实验室基金(2022-SYSJJ-10)。

摘　　要：为提升超声导波技术在板状结构中对损伤位置、大小和形状的精确检测能力,将全聚焦成像算法的低分辨率成像结果和多尺度深度学习算法模型相结合,研究了圆孔和裂纹两种损伤的高精度成像方法。基于深度学习的高精度成像算法由卷积神经网络和反卷积神经网络两部分构成,利用神经网络的多尺度分析、非线性增强和多层级融合功能提升分辨率。在全聚焦成像算法成像结果的基础上构建网络训练数据库,对板中包含圆孔-裂纹双损伤以及圆孔-圆孔双损伤两种情况进行检测验证。结果表明:该方法成像精度高,在精确定位损伤的基础上可以进一步获得损伤的精细特征。In order to improve the ability of ultrasonic guided wave technology in accurately detecting damage location, size and shape in plate-like structures, the low-resolution imaging results of the total focusing method(TFM) and the multi-scale deep learning algorithm model are combined to study a high-precision imaging method for targeting two type of damage: round holes and cracks.The high-precision imaging algorithm based on deep learning is composed of two parts: a convolutional neural network and a deconvolutional neural network. The multi-scale analysis, nonlinear enhancement and multi-level fusion functions of the neural network are used to improve the resolution. On the basis of the imaging results of the all-focus imaging algorithm, a network training database is constructed, and the trained network is used to detect and verify the two cases of circular hole-crack double damage and circular hole-circular hole double damage in the plate. The results show that the imaging method has high imaging accuracy, and can further obtain the fine features of the damage based on the precise location of the damage.

关 键 词：超声导波 板状结构 全聚焦成像方法 深度学习 

分 类 号：TB551[理学—物理]