ABSTRACT The magnetic flux leakage (MFL) inspection technology is widely used in pipeline industry to detect defects to ensure pipeline safety. During the high-speed inspection, a relative motion occurred between the pipeline inspection gauge (PIG) and the steel pipe wall will generate motion-induced eddy current (MIEC). There is a lack of research on analyzing the effect of MIEC on high-speed MFL inspection for thick-wall steel pipe. In this article, a three-dimensional (3D) finite-element method (FEM) simulations are conducted with an inspection speed range of 0 m/s to 8 m/s and a wall thickness range of 8 mm to 15 mm. Simulation results show that both high-speed inspection and thick-wall thickness will decrease the magnetization of steel pipe. It is observed that, at the speed of 8 m/s and the thickness of 15 mm, the magnetic field strength is lower than 2 kA/m and the steel pipe exits from the magnetic saturation zone, which causes the severe distortion of three-axis MFL signals, and the signal-to-noise ratio (SNR) is lower than 6 dB. A high-speed PIG is developed here for experiments to measure the three-axis MFL signals. The characteristics of simulated and measured MFL signals are found to be quite consistent.

中文翻译：

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运动感应涡流对厚壁钢管高速漏磁检测的影响

摘要 漏磁（MFL）检测技术广泛应用于管道行业，检测缺陷以确保管道安全。在高速检测过程中，管道检测仪（PIG）与钢管壁之间发生相对运动，会产生运动感应涡流（MIEC）。缺乏对MIEC对厚壁钢管高速MFL检测影响的研究。在本文中，进行三维 (3D) 有限元法 (FEM) 模拟，检测速度范围为 0 m/s 至 8 m/s，壁厚范围为 8 mm 至 15 mm。仿真结果表明，高速检测和厚壁厚度都会降低钢管的磁化强度。观察到，在 8 m/s 的速度和 15 mm 的厚度下，磁场强度低于2 kA/m，钢管退出磁饱和区，导致三轴MFL信号严重失真，信噪比（SNR）低于6 dB . 这里开发了高速 PIG，用于测量三轴 MFL 信号的实验。发现模拟和测量的 MFL 信号的特性非常一致。