油管漏磁检测有限元仿真及分析

FINITE ELEMENT SIMULATION AND ANALYSIS ON MAGNETIC FLUX LEAKAGE OF TUBING

在石油石化行业中,油管长期服役,因此极容易出现缺陷,作为铁磁性材料的油管,利用基于磁学原理的漏磁检测方法进行检测可以有效地防止油管在工作过程中发生失效。选取油管作为研究对象,利用ANSYS有限元软件对其进行了三维仿真分析。分别改变电流强度,线圈匝数,缺陷深度以及缺陷直径,分析这些参数对缺陷处漏磁场信号的影响规律。分析结果表明漏磁信号随着缺陷的深度增加而增长,磁通量分量的峰值与电流和线圈匝数呈线性递增关系。

In petroleum and petrochemical industries,oil tubes serve for long term,so defects may occur easily.As ferromagnetic material,tubing uses magnetic flux leakage testing method based on magnetism principles.This can prevent tubing failure effectively in the operation course.This paper selects tubing as the research object.Finite element method software ANSYS is applied to the 3-D simulation analysis of tubing.The current intensity,coil number of turns,defect depth and diameter are changed respectively.The paper analyzes the influence rules of these parameters on the magnetic flux leakage signals at the defects.The results show that the magnetic flux leakage signal increases with the depth increase of the defect;the greater the current intensity and the coil number of turns is,the greater the peak of magnetic flux component is,which increases linearly.