Lorentz Force Eddy Current Testing: a Prototype Model
Lorentz Force Eddy Current Testing: a Prototype Model
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DOI：
10.1007/s10921-012-0147-7
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发表时间：
2012-07
影响因子：
2.8
通讯作者：
Robert P. Uhlig;Mladen Zec;H. Brauer;A. Thess
中科院分区：
文献类型：
--
作者：
Robert P. Uhlig;Mladen Zec;H. Brauer;A. Thess
本文研究了含理想缺陷的导电管道中自由落体永磁体的运动。这个问题代表了一个高度简化的，但启发性的版本的方法称为洛伦兹力涡流检测，这是一个修改的传统涡流检测技术。我们的研究是分析理论，数值模拟和实验验证相结合。的分析理论允许一个严格的预测之间的关系的缺陷的大小和下降时间的变化，这代表了本工作的中心结果。数值模拟可以克服固有的分析理论的局限性。我们通过一系列实验来检验我们的预测。我们的结论是，我们的理论正确地抓住了洛伦兹力涡流检测的本质，虽然细化的实验是必要的，以减少预测的差异。尽管其表面上的简单，本系统可以作为一个原型和基准，为今后的研究洛仑兹力涡流检测。
We report an investigation of the motion of a free-falling permanent magnet in an electrically conducting pipe containing an idealized defect. This problem represents a highly simplified yet enlightening version of a method called Lorentz force eddy current testing which is a modification of the traditional eddy current testing technique. Our investigation is a combination of analytical theory, numerical simulation and experimental validation. The analytical theory allows a rigorous prediction about the relation between the size of the defect and the change in falling time which represents the central result of the present work. The numerical simulation allows to overcome limitations inherent in the analytical theory. We test our predictions by performing a series of experiments. We conclude that our theory properly captures the essence of Lorentz force eddy current testing although a refinement of the experiment is necessary to reduce the discrepancy to the predictions. In spite of its apparent simplicity the present system can serve as a prototype and benchmark for future research on Lorentz force eddy current testing.