• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (14): 8-15.doi: 10.3901/JME.2018.14.008

• 仪器科学与技术 • 上一篇    下一篇

基于全向性SH0模态磁致伸缩贴片型传感器阵列的铝板缺陷成像研究

刘增华1,2, 钟栩文1,2, 李欣1,2, 何存富1,2, 吴斌1,2   

  1. 1. 北京工业大学机械工程与应用电子技术学院 北京 100124;
    2. 北京工业大学北京市精密测控与仪器工程技术研究中心 北京 100124
  • 收稿日期:2017-08-07 修回日期:2018-01-29 出版日期:2018-07-20 发布日期:2018-07-20
  • 通讯作者: 刘增华(通信作者),男,1973年出生,博士,教授,博士研究生导师,北京市科技新星。主要研究方向为超声和电磁无损检测技术、结构健康监测、传感器测试技术等。E-mail:liuzenghua@bjut.edu.cn
  • 作者简介:钟栩文,女,1993年出生。主要研究方向为电磁超声导波无损检测技术。E-mail:997864116@qq.com
  • 基金资助:
    国家自然科学基金资助项目(51475012,11272012,11772014)。

Research on Damage Imaging Based on Omnidirectional SH0 Mode Magnetostrictive Patch Transducers Array in Aluminum Plates

LIU Zenghua1,2, ZHONG Xuwen1,2, LI Xin1,2, HE Cunfu1,2, WU Bin1,2   

  1. 1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124;
    2. Beijing Engineering Research Center of Precision Measurement Technology and Instruments, Beijing University of Technology, Beijing 100124
  • Received:2017-08-07 Revised:2018-01-29 Online:2018-07-20 Published:2018-07-20

摘要: 板材在生产、运输或使用过程中易产生缺陷,影响板材的使用并造成安全隐患。采用传感器阵列成像技术能够直观、清晰地显示出缺陷的相关信息。SH0模态在铝板中传播时无频散现象,波速恒定,在对信号进行处理时,不需要考虑频散特性带来的影响,有利于缺陷定位和成像。基于磁致伸缩换能机理,研制出一种能在板中激励接收SH波最低阶模态即SH0模态的磁致伸缩贴片型传感器,并测试其全向性。以工程中应用广泛的铝板作为研究对象,运用研制的全向性SH0模态磁致伸缩贴片型传感器布置成分布式传感器阵列。利用椭圆成像算法,实现了铝板中不同直径的模拟缺陷成像检测,探究了全向性SH0模态磁致伸缩贴片型传感器阵列的检测能力,并基于ROC曲线设定成像通用阈值,提高了缺陷成像质量。

关键词: SH0模态, 磁致伸缩贴片型传感器, 铝板, 缺陷成像, 阈值

Abstract: During the process of production, transportation and application, plates can easily appear damages which influence the performance of plates and cause potential safety hazard. Transducer array imaging technique lays the foundation for damage visualization. Damage information can be displayed through transducer array imaging technology intuitively and clearly. SH0 mode spreads in the aluminum plate with the characteristics of non-dispersion and constant velocity. The impact of dispersion cannot be considered during the signal processing which is helpful to damage location and imaging. A kind of magnetostrictive patch transducer based on the magnetostriction mechanism is made for generating and receiving the lowest mode of SH waves, i.e., SH0 mode, in plates. Furthermore, the omnidirectivity of magnetostrictive patch transducer is tested. Aluminum plates which are popular in engineering applications are taken as research objects. Omnidirectional SH0 mode magnetostrictive patch transducers are arranged as distributed transducers array. Imaging detection of simulated damages with different diameters in aluminum plates are realized by using ellipse algorithm. Furthermore, the detectability of omnidirectional SH0 mode magnetostrictive patch transducers array is studied and imaging common threshold is set for improving the damage imaging quality based on ROC curve.

Key words: aluminum plate, damage imaging, magnetostrictive patch transducer, SH0 mode, threshold

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