基于磁偶极子模型的材料缺陷漏磁检测正演问题的单元积分计算方法

doi:10.19595/j.cnki.1000-6753.tces.170430

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Abstract

In the magnetic flux leakage probing problem, the hypothesis that the magnetic charge is evenly distributed on the defective wall is not true, which is based on the magnetic dipole analysis model. The defective material is equivalent to the magnetic medium after magnetized. Considering the non-linearity of the material, the magnetic charge is non-uniformly distributed throughout the defective material and the defective wall. Therefore, considered the distribution of the magnetization strength in the area of the entire defective material, the vector sum of the magnetic dipole moments in the unit volume is equivalent to a magnetic dipole moment, as the source of the magnetic field. Based on the magnetic dipole model, the integral formula of the magnetic field generated by the magnetic medium of any unit is deduced, and the integral problem of the whole defective material is transformed into the superposition of several units. In this paper, the numerical integration method is used to solve the integral problem of any unit. Furthermore, this method is extended to the whole source region unit, and finally the calculation equation of the magnetic field at any field is obtained. The leakage magnetic field simulation model of the defective material was constructed by COMSOL multiphysics simulation software, and finally the simulation results were compared with the calculated results to verify the correctness of the method proposed in this paper.

Key words： The detection of magnetic flux leakage the magnetic dipole model numerical integration COMSOL multiphysics simulation

Received: 14 April 2017 Published: 10 November 2017

PACS:

TM937

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	Li Yansong
	Liu Qizhi
	Liu Jun
	Tang Xiaojun

Cite this article:

Li Yansong,Liu Qizhi,Liu Jun等. The Unit Integral Calculation Method of Defective Material’s Forward Question of Magnetic Flux Leakage Detection Based on the Magnetic Dipole Model[J]. Transactions of China Electrotechnical Society, 2017, 32(21): 176-185.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170430 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I21/176

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