作者：杨凌, 王召巴, 金永
作者单位：中北大学信息与通信工程学院, 山西 太原 030051
关键词：涡流检测;厚度测量;有限元模型;提离效应
摘要：
基于涡流检测技术，针对管状金属基体涂层厚度测量问题，建立对应三维涡流场问题的有限元模型，通过加载正弦激励信号，分析平板和管道凹面上感应涡流的分布情况，计算曲率半径大小以及提离变化对线圈阻抗信号的影响，以空载线圈的阻抗信号为参照，对平板和凹面涡流线圈的阻抗值进行归一化处理，得到线圈阻抗变化与涂层厚度之间的关系曲线。选取3种不同曲率的管材试件进行实验，仿真计算结果与实验结果相符合，为曲面涂层厚度的实际检测应用提供可靠的理论依据与技术支持。
Finite element analysis of coating thickness of tubular metal substrate
YANG Ling, WANG Zhaoba, JIN Yong
School of Information and Communication Engineering, North University of China, Taiyuan 030051, China
Abstract: Relevant finite element models for three-dimensional eddy current field problem were built based on the eddy current testing technology and the substrate coating thickness measurement of tubular metals. Through loading sinusoidal excitation signal, induced eddy field distributions above the plane and tube concave were analyzed and the influence of curvature radius and lift-off variation on coil's impedance signal was also analyzed, and the impedance data of the eddy coil was referred to normalize plane and concave eddy current coil, so as to obtain the relationship between the impedance variation of coil and coating thickness. Three kinds of tube specimens in different curvature radius were selected for the experiment, and the simulated results are coincident with the experimental results, which provide a reliable theory basis and technical support for actual testing and application of curved surfaces coating thickness.
Keywords: eddy current testing;thickness measurement;finite element model;lift-off effect
2018, 44(9): 126-130 收稿日期: 2018-03-09;收到修改稿日期: 2018-04-18
基金项目: 山西省科技攻关项目（201603D121006-1）；山西省回国留学人员科研资助项目（2016-084）
作者简介: 杨凌(1977-),男,山西长治市人,博士研究生,研究方向为信号与信息处理、无损检测
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