饱和磁化后管壁缺陷处管材磁导率的有限元模拟  

Finite element simulation of pipe permeability at the wall defect after saturation magnetization

作　　者：赵云利 折明 强毅[2] ZHAO Yunli;SHE Ming;QIANG Yi(School of Electronic and Control Engineering,North China Institute of Aerospace Engineering;China Academy of Machinery Science&Technology;Sino-Pipeline International Company Limited)

机构地区：[1]北华航天工业学院电子与控制工程学院 [2]机械科学研究总院 [3]中油国际管道公司

出　　处：《油气储运》2021年第5期539-544,共6页Oil & Gas Storage and Transportation

摘　　要：在管道内检测漏磁涡流复合技术中,涡流传感器信号不仅受到缺陷自身类型大小的影响,还受到缺陷处管材磁导率变化的影响。利用有限元模拟方法分析典型缺陷分别位于管道内、外壁时其周围管材相对磁导率的变化范围和趋势,发现相同规格尺寸内外缺陷区域的相对磁导率大小和变化趋势基本相同,相对磁导率与缺陷的深度和面积均存在关系,并通过测量检测线圈的电感验证了有限元模型与模拟结果的正确性。研究成果对基于漏磁涡流复合技术检测区分管壁内外缺陷具有一定指导意义。In the magnetic flux leakage and eddy current combined inline inspection technology, the signal of eddy current sensor is not only affected by the type and size of the defect itself, but also affected by the permeability of pipe at the defect. By analyzing the variation range and trend of the relative permeability of the pipe around the typical defects that is located on the inner and outer wall of the pipe with the finite element method, it was found that the relative permeability of pipe in same size inside and outside the defect area and its variation trend are basically the same, and the relative permeability is related to the depth and area of the defect. In addition, the accuracy of the finite element model and the results was verified by measuring the inductance of the measurement coil. Generally, the research results have a guiding significance for distinguishing the defects inside and outside the pipe wall based on the magnetic flux leakage and eddy current combined technology.

关 键 词：管道内检测 漏磁检测 相对磁导率 有限元模拟 

分 类 号：TE88[石油与天然气工程—油气储运工程]