| 远场涡流三维缺损检测机理的有限元分析 |
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| 引用本文： | 林鹤云,孙雨施,曲民兴.远场涡流三维缺损检测机理的有限元分析[J].南京航空航天大学学报,1993(1). |
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| 作者姓名： | 林鹤云 孙雨施 曲民兴 |
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| 作者单位： | 南京航空学院自动控制系
(林鹤云，孙雨施)，南京航空学院自动控制系(曲民兴) |
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| 基金项目： | 国家自然科学基金，航空科学基金 |
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| 摘 要： | 本文依据远场涡流检测中场的分布特点对远场涡流模型进行了合理的简化,建立了有限元分析模型,并完成了二维及三维有限元数值分析,给出了缺损附近的磁场、涡流及波印亭矢量的分布,预估了远场技术中三维探头的缺损响应,结合实验结果初步解释了由实验观察到的而至今未被理解的一些远场现象。最后着重分析了周向缺损与轴向缺损的探头信号的差异,并对远场技术缺损的检测机理作了较为细致的探讨,得到了一些重要结论。
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| 关 键 词： | 涡流检验 缺陷检查 有限元分析 远场涡流 缺损响应 |
Finite Element Analysis of 3-D Defect Detection Physics in Remote Field Eddy Current Inspection Technique |
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| Lin Heyun Sun Yushi Qu Minxing.Finite Element Analysis of 3-D Defect Detection Physics in Remote Field Eddy Current Inspection Technique[J].Journal of Nanjing University of Aeronautics & Astronautics,1993(1). |
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| Authors: | Lin Heyun Sun Yushi Qu Minxing |
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| Institution: | Department of Automatic Control |
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| Abstract: | Based on the characteristics of the field distributions in Remote Field Eddy Current (RFEC), a simplified RFEC model is proposed for the modelling of 3-D defect responses. The magnetic field densities, eddy cunent densities and Poynting vector distributions around defects are given by using 2-D and 3-D FEM calculations. The predictions of 3-D probe responses to the defects oriented circumferentially and axially are also shown respectively. Some remote field phenomena which had not been understood are observed by experimentations and explained with the help of calculated results. Finally, the differences between the probe responses caused by the two kinds of 3-D defects are indicated and the defect detection mechanism of RFEC inspection technique is discussed preliminarily. Some important conclusions have been obtained. |
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| Keywords: | eddy current testing defect inspection finite element analysis remote field eddy current defect response |
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