Defect analysis method based on pipeline magnetic flux leakage internal detection
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摘要: 为了更准确地分析管道内壁常见的腐蚀孔洞缺陷，采用三维圆锥模型模拟腐蚀孔洞缺陷，提出一种基于管道漏磁内检测的圆锥缺陷解析方法。以磁荷为纽带建立圆锥缺陷解析模型，得到了缺陷处漏磁场的解析表达式；分析了缺陷深度和半径对缺陷漏磁信号的影响规律，并通过有限元仿真对理论计算结果进行了验证。结果表明，建立的圆锥缺陷解析模型计算结果与仿真分析得到的圆锥缺陷漏磁场分布具有很好的一致性，漏磁信号幅值与圆锥缺陷深度呈正相关，与圆锥缺陷半径、提离值呈负相关，所建模型可有效描述管道内壁腐蚀孔洞的漏磁场分布，为解决管道漏磁内检测问题提供了一种新思路。Abstract: In order to analyze the common corrosion hole defects in the inner wall of pipeline more accurately, a three-dimensional conical model was used to simulate the corrosion hole defects and a conical defect analytic method of pipeline internal detection based on magnetic flux leakage (MFL) was proposed. The analytic model of conical defect was established by using magnetic charge as the link and the analytic expression of magnetic leakage field at the defect was obtained. The influence of defect depth and radius on defect MFL signal was analyzed and the theoretical calculation results were verified by finite element simulation. The results show that calculation results based on cone defect analytic model had rather better consistency with magnetic flux leakage field distribution of cone defect by simulation analysis. The amplitudes of magnetic flux leakage signals were positively related to cone defect depths, negatively related to cone defect radius and lift-off values. The model can effectively describe magnetic flux leakage distribution of the pipeline internal corrosion holes and provide a new idea for solving pipeline magnetic flux leakage internal detection.
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