作者：王倩, 张斌, 王桔, 常森

作者单位：中国计量大学计量测试工程学院, 浙江 杭州 310018

关键词：U型电磁超声换能器;三维有限元仿真;换能效率;线圈;U型永磁体

摘要：

针对U型电磁超声表面波换能器（electromagnetic acoustic transducer，EMAT）换能效率低的问题，提出一种基于三维仿真的研究方法。首先，在Maxwell软件中建立U型电磁超声无损检测激发探头三维有限元模型并进行仿真分析，研究电磁超声换能器中线圈间距、截面积以及提离距离和磁铁类型及几何参数对换能效率的影响。结果表明：在使用蛇形线圈和U型磁铁作为电磁超声表面波换能器的情况下，减小线圈的提离距离、线圈截面积，适当增大线圈间距可以提高EMAT换能效率；此外，正交方差分析法对U型永磁铁的几何参数研究表明，U型永磁铁的宽度对换能效率的影响显著。

Research on 3D simulation of U-shaped electromagnetic ultrasonic transducer
WANG Qian, ZHANG Bin, WANG Ju, CHANG Sen
College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Abstract: Aiming at the low conversion efficiency of U-shaped electromagnetic ultrasonic surface acoustic wave transducer EMAT, a research method based on three-dimensional simulation was proposed. Firstly, a three-dimensional finite element model of U-shaped electromagnetic ultrasonic non-destructive testing excitation probe was established in Maxwell software and simulated, coil spacing, cross-sectional area and lifting distance of the electromagnetic ultrasonic transducer and the influence of magnet type and geometric parameters on the energy conversion efficiency were studied. The results showed that reducing the lift distance of the coil, the cross-sectional area of the coil, and appropriately increasing the coil pitch could improve the EMAT conversion efficiency in the case of using the serpentine coil and the U-shaped magnet as the electromagnetic ultrasonic surface wave transducer. In addition, the geometric analysis of U-shaped permanent magnets by orthogonal analysis of variance showed that the width of U-shaped permanent magnets had a significant effect on the efficiency of conversion.
Keywords: U-shaped electromagnetic ultrasonic transducer;three-dimensional finite element simulation;energy transfer efficiency;coil;U-shaped permanent magnet
2019, 45(11):84-89  收稿日期: 2018-07-28;收到修改稿日期: 2018-11-23
基金项目: 浙江省自然科学基金资助项目（LY17E050015）
作者简介: 王倩(1994-),女,河南开封市人,硕士研究生,专业方向为测试计量技术及仪器
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