Proposal of inspection method for rear side defect in steel plate using electromagnetic force vibration

A. Hagisaka, I. Yamada, S. Niwa, S. Shiota, Y. Gao, Y. Gotoh
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Abstract

It is important to detect the rear side corrosion and defect of steel plates used in large structures, etc. Generally, the radiation transmission inspection method or the ultrasonic flaw detection tests are widely used for the detection of a defect in steel. However, the former inspection method is required a long inspection time and a lot of cost for equipment. In the latter method, the contact catalysts such as water or grease are required and the surface of the steel plate needs to be polished. In this research, the detection method of the rear side defect in the steel plate by applying vibration due to electromagnetic force and measuring its vibration is proposed. The proposed inspection sensor consists of a permanent magnet, an alternating excitation coil using a steady exciting frequency, and a vibration sensor. The rear side defect in the steel plate is evaluated by the excitation frequency component of the measured vibration intensity using the vibration sensor. The vibration distribution by the electromagnetic force in the steel plate with and without the defect is evaluated by the electromagnetic 3D-FEM analysis considering the non-linearity of the magnetic characteristics and the displacement 3D-FEM analysis.
提出了利用电磁力振动检测钢板背面缺陷的方法
大型结构用钢板的后侧腐蚀和缺陷检测具有重要意义。一般来说,广泛采用辐射透射探伤法或超声波探伤试验来检测钢的缺陷。然而,前一种检测方法需要较长的检测时间和大量的设备成本。在后一种方法中,需要水或油脂等接触催化剂,并且需要对钢板表面进行抛光。本研究提出了一种利用电磁力施加振动并测量其振动的钢板后侧缺陷检测方法。所提出的检测传感器由一个永磁体、一个使用稳定激励频率的交流励磁线圈和一个振动传感器组成。利用振动传感器测量的振动强度的激励频率分量来评价钢板的后侧缺陷。考虑电磁特性的非线性和位移的三维有限元分析,采用电磁三维有限元分析方法对有缺陷和无缺陷钢板的电磁力振动分布进行了评价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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