Page 11 - 《应用声学》2021年第3期

第 40 卷 第 3 期 Vol. 40, No. 3
2021 年 5 月 Journal of Applied Acoustics May, 2021

⋄ 研究报告 ⋄

在线超声检测系统中螺旋线圈换能器的应用 ∗

吴 迪 1† 韦小鹤 1 毕 超 2 张博南 3 王亚平 1 滕永平 1

(1 北京交通大学理学院 北京 100044)
(2 中国铁道科学研究院集团有限公司金属及化学研究所 北京 100081)
(3 北京信泰智合科技发展公司 北京 100098)

摘要：针对在线车轮超声检测系统的工程应用，研究了圆形螺旋线圈电磁超声换能器由洛伦兹力换能机制在
钢中产生的辐射声场。给出了涡流、等效表面力源和辐射声场的计算方法，分析了圆形螺旋线圈换能器在钢试
块上的辐射指向性。结果表明，辐射的圆周径向偏振横波为两边瓣中空指向性，对理解圆形螺旋线圈换能器的
辐射声场和在重载货车车轮轮辋在线辋裂缺陷检测中的工程应用具有一定的指导意义。
关键词：电磁超声；重载货车车轮；在线车轮检测；声场指向性
中图法分类号: TB552 文献标识码: A 文章编号: 1000-310X(2021)03-0329-06
DOI: 10.11684/j.issn.1000-310X.2021.03.002

Application of the spiral coil electromagnetic acoustic transducer in online

ultrasonic testing system

WU Di 1 WEI Xiaohe 1 BI Chao 2 ZHANG Bonan 3 WANG Yaping 1 TENG Yongping 1

(1 School of Sciences, Beijing Jiaotong University, Beijing 100044, China)
(2 Metals & Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China)
(3 Beijing Xintai Zhihe Technology Development Co., Ltd., Beijing 100098, China)

Abstract: The radiated acoustic field which produced by a spiral coil electromagnetic acoustic transducer
(EMAT) with Lorentz force mechanism was studied for the engineering application of the online train wheel
ultrasonic testing system. The numerical methods of computing the eddy current, the equivalent surface stress
and the radiated acoustic field were given and the directivity pattern radiated by this spiral coil transducer on
steel block was analyzed, indicating the spatial directivity pattern of radiated radial shear wave was null axis
and two side lobes. The results were guidance for understanding the radiated acoustic field of the spiral coil
electromagnetic acoustic transducer and its engineering application of online wheel rim crack defect testing for
heavy haul freight train.
Keywords: Electromagnetic acoustic transducer; Heavy haul freight train wheel; Online train wheel testing;
Ultrasound field directivity

2020-08-08 收稿; 2020-10-21 定稿
中央高校基本科研业务费专项 (2019JBM067)
∗
作者简介: 吴迪 (1979– ), 男, 湖南江华人, 博士, 研究方向: 检测超声。
† 通信作者 E-mail: diwu@bjtu.edu.cn