The magnetic-flux leakage (MFL)-type pipeline inspection is a method of inspecting the pipe by detecting the leaked magnetic flux due to defects after applying a large magnetic field, and there is an advantage that even a small defect can be found regardless of the inner and outer walls of the pipe. In addition, since the MFL pipeline inspection gauge, called MFL pipeline inspection gauge (PIG), can be moved by the gas pressure in pipes, it is widely used for pipeline inspection including buried pipelines. However, after performing the MFL-type pipeline inspection, the remanent magnetization remains on the pipes due to the large applied magnetic field and magnetic hysteresis of pipe, which affects the subsequent inspection signal. However, since the direction of the MFL-type pipeline inspection depends on the direction in which the gas flows, it cannot always be inspected in the same direction. Moreover, since the remanent magnetization has different effects on the inspection signal depending on the subsequent inspection direction, it is necessary to analyze the effects of the remanent magnetization on the inspection signal considering the inspection direction. In this article, the remanent magnetization due to MFL PIG is analyzed using the Preisach model, and the effect of the remanent magnetization on the subsequent inspection considering the inspection directions is analyzed using the finite-element analysis. The results of the analysis are verified through experiments.

中文翻译：

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使用Preisach模型进行管道复检的磁滞分析

漏磁（MFL）式管道检查是通过施加大磁场后检测因缺陷而泄漏的磁通来检查管道的方法，其优点是即使很小的缺陷也能发现管道的内壁和外壁。此外，由于MFL管道检查表，称为MFL管道检查表（PIG），可以通过管道中的气体压力移动，因此广泛用于包括埋地管道在内的管道检查。但是，在进行MFL型管道检测后，由于管道外加磁场和磁滞较大，管道上会残留剩磁，影响后续检测信号。但是，由于MFL型管道检查的方向取决于气体流动的方向，它不能总是在同一方向进行检查。此外，由于剩余磁化强度根据后续检查方向对检查信号的影响不同，因此需要考虑检查方向来分析剩余磁化强度对检查信号的影响。本文利用Preisach模型分析了MFL PIG引起的剩磁，并利用有限元分析了考虑检测方向的剩磁对后续检测的影响。分析结果通过实验验证。考虑检测方向，需要分析剩磁对检测信号的影响。本文利用Preisach模型分析了MFL PIG引起的剩磁，并利用有限元分析了考虑检测方向的剩磁对后续检测的影响。分析结果通过实验验证。考虑检测方向，需要分析剩磁对检测信号的影响。本文利用Preisach模型分析了MFL PIG引起的剩磁，并利用有限元分析了考虑检测方向的剩磁对后续检测的影响。分析结果通过实验验证。