基于COMSOL的线聚焦EMAT声场特性仿真分析  

Simulation analysis of sound field characteristics of line-focusing EMAT based on COMSOL

作　　者：潘奕宏 吴运新 吴雨唐[2] 蔡壮 PAN Yihong;WU Yunxin;WU Yutang;CAI Zhuang(Research Institute of Light Alloys,Central South University,Changsha 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《传感器与微系统》2021年第11期21-24,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(51975596);高性能复杂制造国家重点实验室自主研究项目(ZZYJKT2020-13)。

摘　　要：为了提高电磁超声线聚焦换能器的线聚焦性能,增强对微小缺陷的检测效果,利用COMSOL软件对线聚焦电磁超声换能器(EMAT)的激发过程进行了数值模拟,研究了线聚焦EMAT所激发超声波的声场特性,分析了激励周期、线圈匝数和聚焦距离对线聚焦性能的影响。研究结果表明:适当增加激励周期、减小聚焦距离既可以增大线聚焦主瓣峰值,又可以减小线聚焦声束宽度,有利于获得更好的线聚焦效果;在进行线聚焦EMAT设计时应选择适当的线圈匝数,匝数过多和过少均不利于提高换能器的线聚焦性能。In order to improve the line-focusing performance of line-focusing electromagnetic acoustic transducer(EMAT)and enhance the detection effect of small defects,the excitation process of line-focusing EMAT is numerically simulated by COMSOL software,the sound field characteristics of ultrasonic waves excited by line-focusing EMAT are studied,and the effects of key parameters such as excitation period,coil turns and focusing distance on line-focusing performance are analyzed.The results show that properly increasing the excitation period and reducing the focusing distance can not only increase the peak value of the line-focusing main lobe,but also reduce the width of the line-focusing beam,which is beneficial to obtain a better line-focusing effect.the appropriate number of coil turns should be selected in the design of line-focusing EMAT,too many turns and too few turns are not conducive to improve the line-focusing performance of the transducer.

关 键 词：电磁超声换能器 线聚焦SV波 声场特性 仿真分析 

分 类 号：TB552[理学—物理] TP212[理学—声学]