• CN:11-2187/TH
  • ISSN:0577-6686

›› 2010, Vol. 46 ›› Issue (6): 71-76.

• 论文 • 上一篇    下一篇

基于磁致伸缩效应在钢绞线中激励接收纵向导波模态的试验研究

刘增华;张易农;张慧昕;何存富;吴斌   

  1. 北京工业大学机械工程与应用电子技术学院;浙江省交通厅工程质量监督局
  • 发布日期:2010-03-20

Experimental Research on Excitation and Reception of Longitudinal Guided Wave Modes in Steel Strands Based on Magnetostrictive Effect

LIU Zenghua;ZHANG Yinong;ZHANG Huixin;HE Cunfu;WU Bin   

  1. College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology
  • Published:2010-03-20

摘要: 对利用磁致伸缩效应在钢绞线中激励接收纵向导波模态的方法进行理论分析和试验研究。分析在公称直径为17.80 mm的7芯钢绞线中纵向模态的传播特性。选取钢绞线外围钢丝中频率160 kHz的L(0,1)模态用于钢绞线的健康检测。基于该模态的传播特性和钢绞线缠绕式外表面的特点,研制一种专用磁致伸缩传感器,用于7芯钢绞线的超声导波检测。该传感器的主要结构包括轴对称三磁路励磁结构和正反正绕向的三段式螺线管。三磁路励磁结构用来产生强度适合且均匀的偏置磁场,并设计专用夹片以降低钢绞线不规则外形所造成的空气磁阻。螺线管每段绕线的有效轴向宽度为频率160 kHz的L(0,1)模态波长的一半。利用研制的磁致伸缩传感器,在长1 180 mm的自由钢绞线中进行超声导波的激励接收试验。试验结果表明,该传感器可以激励和接收选定的纵向模态L(0,1),为基于磁致伸缩效应的钢绞线超声导波检测奠定了一定基础。

关键词: 超声导波, 传感器, 磁致伸缩效应, 钢绞线, 模态

Abstract: Excitation and reception methods of the longitudinal guided wave modes in steel strands based on magnetostrictive effect are analyzed theoretically and verified in the experiment. Propagation characteristics of longitudinal modes in a 17.80 mm nominal diameter steel strand are firstly investigated. L(0,1) mode at 160 kHz in one of helical wires is optimized for health inspection of the steel strand. Based on propagation characteristics of this mode and peripheral winding surface of steel strands, a kind of special magnetostrictive transducer is developed for ultrasonic guided wave inspection of seven-wire steel strands. The transducer mainly consists of axisymmetric three permanent bias magnetic circuits and a three-section spiral tube with reverse normal winding directions. These axisymmetric circuits are used for producing bias magnetic field with suitable and uniform strength, and the special clamp groups are designed for reducing air reluctance caused by irregular contour of steel strands. Effective axial width of each section of spiral tube equals to half wavelength of L(0,1) mode at 160 kHz. By using these developed magnetostrictive transducers,guided wave excitation and reception are achieved in a 1 180 mm long free steel strand. Experimental results show that chosen L(0,1) mode can be excited and received by using developed magnetostrictive transducers. These transducers will provide the experimental basis for ultrasonic guided wave inspection of steel strands based on magnetostrictive effect.

Key words: Magnetostrictive effect, Mode, Steel strand, Transducer, Ultrasonic guided waves

中图分类号: