基于概率损伤算法的铝板电磁超声Lamb波扫描成像
Scanning Imaging of Aluminum Plate Using Electromagnetic Acoustic Lamb Waves Based on Probabilistic Damage Algorithm
摘 要
A0模态Lamb波具有波长短、检测灵敏度高等特点，可在板结构中实现大范围、高效率的损伤检测和监测。设计并制作了一种指向性的A0模态电磁声传感器，其由印制于柔性电路板上的回折线圈和马蹄形磁铁组成。试验验证了所设计的传感器可在铝板中有效地激励出单一的A0模态。为了实现铝板中缺陷的检测与重构，提出了一种基于EMAT（电磁声传感器）的Lamb波扫描成像技术，对铝板中不同形状的预制模拟缺陷进行扫描检测。对各扫描路径下检测信号的直达波进行虚拟时间反转计算，提取不同路径下的损伤指数，并结合损伤概率成像算法和数据融合方法，实现了预制模拟缺陷的定位和重构，成像结果与缺陷实际位置和形状非常吻合。
电磁声传感器
无损检测
概率损伤算法
Lamb wave
EMAT
nondestructive testing
probabilistic damage algorithm
Abstract
A0 mode of Lamb waves is widely used in defect detection and monitoring with large scale and high efficiency in plate-like structures due to its shorter wave length compared with other mode in the specified frequency range, which leads to high sensitivity to small damages. A unidirectional A0 mode electromagnetic acoustic transducer (EMAT) is developed and it consists of a meander coil on flexible printed coil (FPC), and a horseshoe magnet. The experimental results verify that the developed transducer can effectively produce the pure A0 mode in an aluminum plate. In order to realize flaw detection and reconstruction for the aluminum plate, a new electromagnetic ultrasonic scan imaging technology was developed. The damage index was defined by using virtual time reversal method. The combination of probabilistic damage algorithm and data fusion algorithm was used to deal with multiple sets of data. The location and imaging of simulated defects on the aluminum plate were well achieved accurately.
中图分类号 TG115.28 TB552 DOI 10.11973/wsjc201902001
所属栏目 科研成果与学术交流
基金项目 国家重点研发计划（2018YFF0214701）
收稿日期 2018/7/19
修改稿日期
网络出版日期
作者单位点击查看
联系人作者丁克勤(kqding@sina.com)
备注胡亚男(1988-),男,工程师,主要从事特种设备安全、结构健康监测、无损检测新技术、新方法的研发工作
引用该论文: HU Yanan,ZHAO Na,ZHANG Xu,SHI Yisheng,DING Keqin. Scanning Imaging of Aluminum Plate Using Electromagnetic Acoustic Lamb Waves Based on Probabilistic Damage Algorithm[J]. Nondestructive Testing, 2019, 41(2): 1～7
胡亚男,赵娜,张旭,史一生,丁克勤. 基于概率损伤算法的铝板电磁超声Lamb波扫描成像[J]. 无损检测, 2019, 41(2): 1～7
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【3】刘增华, 赵继辰, 吴斌, 等. 板中孔状缺陷的超声导波检测试验研究[J]. 北京工业大学学报, 2011,37(1):27-32.
【4】PUTKIS O, DALRON R P, CROXFORD A J. The anisotropic propagation of ultrasonic guided waves in composite materials and implications for practical applications[J]. Ultrasonics,2016, 65:390-399.
【5】RAMADAS C, BALASUBRAMANIAM K, JOSHI M, et al. Interaction of the primary antisymmetric Lamb mode(A0) with symmetric delaminations:numerical and experimental studies[J]. Smart Materials and Structures, 2009, 18(8):1-7.
【6】LIU Zenghua, YU Hongtao, HE Cunfu, et al. Delamination damage detection of laminated composite beams using air-coupled ultrasonic transducers[J]. Science China Physics, Mechanics and Astronomy, 2013, 56(7):1269-1279.
【7】GIURGIUTIU V, LIN B, SANTONI G, et al. Space application of piezoelectric wafer active sensors for structural health monitoring[J]. Journal of Intelligent Material Systems and Structures, 2011, 22(12):1359-1370.
【8】刘增华,谢穆文, 钟栩文, 等. 超声导波电磁声换能器的研究进展[J]. 北京工业大学学报, 2017, 43(2):192-202.
【9】VASILE C F, THOMPSON R B. Excitation of horizontally polarized shear elastic waves by electromagnetic transducers with periodic permanent magnets[J]. Journal of Applied Physics, 1979, 50(4):2583-2588.
【10】GUO Z, ACHENBACK J D, KRISHNASWAMY S. EMAT generation and laser detection of single Lamb wave modes[J]. Ultrasonics, 1997, 35:423-429.
【11】LIU Z, HU Y, XIE M, et al. Development of omnidirectional A0 mode EMAT employing a concentric permanent magnet pairs with opposite polarity for plate inspection[J]. NDT & E International, 2018, 94:13-21.
【12】CLARKE T, SIMONETTI F, CAWLEY P. Guided wave health monitoring of complex structures by sparse array systems:Influence of temperature changes on performance[J]. Journal of Sound and Vibration, 2010, 329(12):2306-2322.
【13】GANGADHARAN R, BHAT M R, MURTHY C R L, et al. A geodesic-based triangulation technique for damage location in metallic and composite plates[J]. Smart Materials and Structures, 2010, 19(11):1-10.
【14】HAY T, ROYER R, GAO H, et al. A comparison of embedded sensor Lamb wave ultrasonic tomography approaches for material loss detection[J].Smart Materials and Structures,2006,15(4):946-951.
【15】RIBICHINI R, CEGLA F, NAGY P B, et al. Study and comparison of different EMAT configurations for SH wave inspection[J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2011, 58(12):2571-2581.
【16】FINK M. Time reversal of ultrasonic fields-I:Basic principles[J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1992, 39(5):555-566.
【17】ING R, FINK M. Time-reversed Lamb waves[J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1998, 45(4):1032-1043.
【18】WATKINS R, JHA R. A modified time reversal method for Lamb wave based diagnostics of composite structures[J]. Mechanical Systems and Signal Processing, 2012, 31:345-354.
【19】LIU Z, YU H, FAN J, et al. Baseline-free delamination inspection in composite plates by synthesizing non-contact air-coupled Lamb wave scan method and virtual time reversal algorithm[J]. Smart Materials and Structures, 2015, 24(4):45014-45028.
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