| 远场涡流似波特性的现象与本质研究 |
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| 引用本文： | 陈美娟,赵阳,施大宁,曲民兴.远场涡流似波特性的现象与本质研究[J].电工技术学报,1997(3). |
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| 作者姓名： | 陈美娟 赵阳 施大宁 曲民兴 |
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| 作者单位： | 南京航空航天大学 |
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| 摘 要： | 远场涡流效应在数学上遵守扩散方程，但是其电磁特性又呈现某些似波动特性。本文从电磁场基本理论出发，以电磁场有限元分析为工具，首次较完整、系统地研究了远场涡流的似波特性，主要集中在电磁场量的相速特征和瞬时扩散能量流特征这两个方面。研究结果表明，远场涡流的电磁场量在远场区具有稳定的相速度，但其值远小于光速；瞬时扩散能量流的变化可以用能流分界线来表示，滞后于激励电流源的变化，呈现出似波动特性。似波特性的实质是管壁中涡流的影响。
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| 关 键 词： | 涡流，特性，有限元法 |
The Phenomena and Puysics Ressearch of Wave-LikeProperty in Remote Field Eddy Current Effect |
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| Chen,Meijuan,Zhao Yang,Shi,Daning,Qu,Minxing.The Phenomena and Puysics Ressearch of Wave-LikeProperty in Remote Field Eddy Current Effect[J].Transactions of China Electrotechnical Society,1997(3). |
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| Authors: | Chen Meijuan Zhao Yang Shi Daning Qu Minxing |
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| Affiliation: | Nanjing University of Aeronautics and Astronautics |
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| Abstract: | The wave - like property of the remote field eddy current effect is studied thoroughly and systemati- cally by the finite elemet method and electromagnetic theory for the first time although the diffusion equations are obeyed in mathematics. . The focus is on the phase velocity property of electromagnetic field vectors and the instantaneous energy flow property Results show that there exists a steady phase velocity for a field vector only in the remote field area which is much less than that of the electromagnetic wave, and the change of instantaneous energy flow , which could be expressed by the separating - line of energy flow, is delayed compared with the change of the electric source, and the wave - like phenomena result from the eddy current within the pipe |
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| Keywords: | Remote field eddy current Wave - like phenomena Finite - element method |
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