基于旋转电磁场的裂纹周围电流分布反演新方法

doi:10.3901/JME.2024.18.017

机械工程学报 ›› 2024, Vol. 60 ›› Issue (18): 17-23.doi: 10.3901/JME.2024.18.017

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基于旋转电磁场的裂纹周围电流分布反演新方法

葛玖浩, 陈炫昂, 杨晨开, 徐飞

南京航空航天大学高速载运设施的无损检测和监控技术工信部重点实验室南京 211106

收稿日期:2023-09-12 修回日期:2024-04-14 出版日期:2024-09-20 发布日期:2024-11-15
作者简介:葛玖浩(通信作者),男,1990年出生,博士,讲师,硕士研究生导师。主要研究方向为电磁无损检测技术。E-mail:gejiuhao@nuaa.edu.cn
陈炫昂,男,1999年出生。主要研究方向为测控技术及仪器。E-mail:Chen777@nuaa.edu.cn
杨晨开,男,1997年出生,硕士。主要研究方向为测控技术及仪器。E-mail:yangchenkai@nuaa.edu.cn
徐飞,男,2000年出生。主要研究方向为测控技术及仪器。E-mail:feixu@nuaa.edu.cn
基金资助:
国家自然科学基金青年基金(61903191)和中央高校基本科研业务费(NS2022038)资助项目。

Novel Method of Eddy Current Distribution Mapping Around Crack Using the Signal of Rotating Eddy Current Testing Technique

GE Jiuhao, CHEN Xuanang, YANG Chenkai, XU Fei

Nondestructive Detection and Monitoring Technology for High Speed Transportation Facilities, Key Laboratory of Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016

Received:2023-09-12 Revised:2024-04-14 Online:2024-09-20 Published:2024-11-15

摘要/Abstract

摘要： 在应力和环境的共同作用下，结构物中所产生的自然裂纹往往以多条、簇状和交叉等复杂形式存在。采用涡流技术对复杂裂纹进行检测时，复杂裂纹内的各个裂纹的扰动电流产生的磁场将在空间中发生叠加，导致传统方法无法实现复杂裂纹尺寸的准确量化。为实现复杂裂纹表面轮廓重构，融合旋转电磁场检测技术和电流分布反演算法，提出复杂裂纹周围电流分布反演新方法。新算法将旋转电磁场检测探头信号转化为不同旋转时刻下均匀场涡流探头信号，采用方形电流偶极子模型对不同时刻下裂纹周围电流进行离散化，再分别对不同时刻信号进行电流反演，最终将所有结果叠加。构建复杂裂纹扰动电流反演试验系统，并开展了算法的试验验证。试验结果表明：仅通过磁场信号，无法准确和具体的确定复杂裂纹表面轮廓信息，采用所提出的新算法可清晰直接地获得复杂裂纹的位置、方向和表面轮廓信息，裂纹表面轮廓反演结果的最大相对误差不超过5%，算法具有较高的精度。

关键词: 旋转电磁场, 复杂裂纹, 电流反演, 裂纹表面轮廓重构

Abstract: With the combination of stress and environment, natural cracks in structures usually exist in the form of multiple, colony and crossing et al. When detecting the cracks using eddy current testing technique, the disturbed eddy currents of individual parts in complex cracks will generate magnetic signals. The magnetic signals will superpose together, which makes it hard to accurately evaluate the parameters of complex cracks through traditional methods. To reconstruct the surface profile of complex cracks, in this paper, a novel method fusing rotating eddy current testing technique and eddy current mapping was proposed. In the new method, the signal of rotating eddy current testing probe is transformed into the results of uniform eddy current probe at the desired moment first. Then, the eddy current mapping is obtained from the deconvolution of signals. Finally, all the results are accumulated. At the same time, experiment system is set up, and method is validated. The experiment results indicate that merely using magnetic signal is inadequate to evaluate the surface profile of complex cracks. Using the proposed method, the position, orientation, and surface profile of complex cracks can be obviously obtained. The accurate of the proposed method is high with the maximum reconstructed error of below 5%.

Key words: rotating eddy current, complex crack, eddy current mapping, crack surface profile reconstruction

中图分类号:

TH865

葛玖浩, 陈炫昂, 杨晨开, 徐飞. 基于旋转电磁场的裂纹周围电流分布反演新方法[J]. 机械工程学报, 2024, 60(18): 17-23.

GE Jiuhao, CHEN Xuanang, YANG Chenkai, XU Fei. Novel Method of Eddy Current Distribution Mapping Around Crack Using the Signal of Rotating Eddy Current Testing Technique[J]. Journal of Mechanical Engineering, 2024, 60(18): 17-23.

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基于旋转电磁场的裂纹周围电流分布反演新方法

Novel Method of Eddy Current Distribution Mapping Around Crack Using the Signal of Rotating Eddy Current Testing Technique

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