Enhancing unilateral EMAT performance through topological optimization of Halbach permanent Magnet arrays

IF 4.1 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Ndt & E International Pub Date : 2024-06-27 DOI:10.1016/j.ndteint.2024.103172

Ting Zhang, Xiaoqing Yang, Meng Li, Huajiang Peng, Wentao Peng

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Abstract

A novel unilaterally excited electromagnetic acoustic transducer (EMAT) is proposed as a solution to address the challenge of weak electromagnetic ultrasonic detection signals being susceptible to interference from clutter noise signals. EMAT employs Halbach permanent magnet array (HPMA) structure and a coil designed based on Huygens superposition principle. This design enables the generation and reception of highly directive Rayleigh surface waves in aluminum plates. To enhance the operational efficiency of EMAT while maintaining a high level of directivity for surface waves, a penalty function is implemented in COMSOL Multiphysics for the topological optimization of EMAT. The objective function in this optimization process is based on covariance (COV) of the magnetic induction intensity. The research results suggest that the homogeneity of the magnetic induction intensity within the coil region is enhanced by 50 % following topological optimization compared to the original design. The energy conversion efficiency of EMAT is enhanced by 5 times compared to traditional designs. The surface wave speed was determined to be 2631 m/s when measured at a frequency of 400 kHz. The value indicates a relative error of 6.37 % in comparison to the theoretical speed. The results indicate that EMAT has the capability to generate high-directional and pure Rayleigh waves.

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通过拓扑优化哈尔巴赫永久磁铁阵列提高单侧电磁超声技术性能

为解决弱电磁超声波探测信号易受杂波噪声信号干扰的难题，提出了一种新型单侧激励电磁声换能器（EMAT）。EMAT 采用哈尔巴赫永磁阵列（HPMA）结构和基于惠更斯叠加原理设计的线圈。这种设计可以在铝板上产生和接收高指向性的瑞利表面波。为了提高 EMAT 的运行效率，同时保持表面波的高指向性，在 COMSOL Multiphysics 中实施了惩罚函数，对 EMAT 进行拓扑优化。优化过程中的目标函数基于磁感应强度的协方差 (COV)。研究结果表明，与原始设计相比，拓扑优化后线圈区域内磁感应强度的均匀性提高了 50%。与传统设计相比，EMAT 的能量转换效率提高了 5 倍。在 400 kHz 频率下测量的表面波速度为 2631 m/s。该值与理论速度相比，相对误差为 6.37%。结果表明，EMAT 能够产生高方向性的纯瑞利波。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.