基于管道漏磁内检测的缺陷解析方法  

Defect analysis method based on pipeline magnetic flux leakage internal detection

作　　者：吕连鑫 杨理践[1] 耿浩[1] 刘屹然 LÜLianxin;YANG Lijian;GENG Hao;LIU Yiran(School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;PipeChina Oil&Gas Control Center,Beijing 100013,China)

机构地区：[1]沈阳工业大学信息科学与工程学院,沈阳110870 [2]国家管网集团油气调控中心,北京100013

出　　处：《无损检测》2023年第5期46-50,共5页Nondestructive Testing

基　　金：国家自然科学基金项目(62101356);辽宁省教育厅高等学校基本科研项目(LJKZ0134)。

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。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.

关 键 词：管道漏磁内检测 磁偶极子模型 圆锥缺陷 永磁励磁 

分 类 号：TM153.1[电气工程—电工理论与新技术] TG115.28[金属学及工艺—物理冶金]