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基于改进磁荷模型的管道复合缺陷漏磁场信号定量研究

Quantitative Study on MFL Signal of Pipeline Composite Defect Based on Improved Magnetic Charge Model.

作者信息

Liu Bin, Luo Ning, Feng Gang

机构信息

College of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870, China.

出版信息

Sensors (Basel). 2021 May 13;21(10):3412. doi: 10.3390/s21103412.

DOI:10.3390/s21103412
PMID:34068412
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8153570/
Abstract

Pipeline magnetic flux leakage (MFL) internal detection technology is the most widely used and effective method in the field of long-distance oil and gas pipeline online detection. With the improvement of data quantization precision, the influence of stress on MFL signal has been paid more and more attention. In this paper, the relationship between stress and saturation magnetization is introduced based on J-A theory. The analytical model of MFL detection signal for pipeline composite defects is established. The MFL signal characteristics of composite defects are quantitatively calculated. The effect of stress on MFL signal is studied. The theoretical analysis is verified by experimental data and excavation results. The researches show that the saturation magnetization of ferromagnets decreases exponentially with the increase of stress in strong magnetic field. The MFL signal of composite defect is weaker than that of volumetric defects of the same dimension. The axial amplitude and radial peak-to-peak value of MFL signal decrease with the increase of stress around the defect. The axial amplitude and radial peak-to-peak value of MFL signal increase non-linearly with the increase of width and depth of defects. When using MFL signal to judge the defect depth, it is necessary to make clear whether there is stress concentration phenomenon around the defect because the stress will lead to underestimation of the defect depth.

摘要

管道漏磁（MFL）内检测技术是长输油气管道在线检测领域应用最为广泛且有效的方法。随着数据量化精度的提高，应力对漏磁信号的影响越来越受到关注。本文基于J-A理论介绍了应力与饱和磁化强度之间的关系，建立了管道复合缺陷漏磁检测信号的解析模型，定量计算了复合缺陷的漏磁信号特征，研究了应力对漏磁信号的影响，并通过实验数据和开挖结果对理论分析进行了验证。研究表明，在强磁场中，铁磁体的饱和磁化强度随应力的增加呈指数下降；复合缺陷的漏磁信号比相同尺寸的体积型缺陷弱；缺陷周围应力增大时，漏磁信号的轴向幅值和径向峰峰值减小；漏磁信号的轴向幅值和径向峰峰值随缺陷宽度和深度的增加呈非线性增大；利用漏磁信号判断缺陷深度时，需明确缺陷周围是否存在应力集中现象，因为应力会导致对缺陷深度的低估。

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