油气管道漏磁内检测三维有限元动态仿真分析与验证  

MFL 3D finite element simulation analysis and verification of dynamic test in oil and gas pipeline

作　　者：赵番 ZHAO Fan(Shanghai Institute of Special Equipment Inspection and Technical Research,Shanghai 200062,China;Shanghai Engineering Research Center of Pressed Pipeline Intelligent Inspection,Shanghai 200062,China)

机构地区：[1]上海市特种设备监督检验技术研究院,上海200062 [2]上海压力管道智能检测工程技术研究中心,上海200062

出　　处：《压力容器》2024年第9期77-86,共10页Pressure Vessel Technology

基　　金：国家市场监督管理总局科技计划项目(2023MK032);上海市市场监督管理局科研项目(2024-39)。

摘　　要：为解决管道漏磁内检测缺陷量化精度不足的问题,建立漏磁内检测三维有限元动态数值仿真模型,从理论上研究缺陷对漏磁信号的影响规律。为提升缺陷附近的网格质量、降低其他区域网格量,设计了三维有限元仿真模型,将单元数减少到原来的34%,计算时间缩短为原来的4%。在钢刷与管道之间引入带有适当间隙的运动域,将模型由静态变为动态,并建立等效磁路模型,补偿引入间隙的影响。设计了漏磁动态测试平台,在简易漏磁检测器和缺陷样管上进行有限元仿真验证,结果显示,仿真和试验的轴向峰值误差为0.57%,径向两峰值误差为0.41%和0.14%。该漏磁信号有限元仿真与动态试验相结合的方法可有效节约试验时间和成本。In order to solve the problem of insufficient quantization accuracy of magnetic flux leakage(MFL)detection in pipeline,a three-dimensional finite element dynamic numerical simulation model for MFL detection was established,and the effect of defects on MFL signal was studied theoretically.The process of 3D finite element simulation model was introduced.To improve the mesh quality near the defect and reduce the mesh quantity in other areas,a simplified model was designed to reduce the number of elements to 34%and the calculation to 4%.A moving domain with appropriate clearance was introduced between the steel brush and the pipe to change the model from static to dynamic,and an equivalent magnetic circuit model was established to compensate for the influence of the introduced clearance.A dynamic MFL test platform was designed,and finite element simulation was verified on a simple MFL detector and a defect sample tube.The verification results show that the axial peak error between simulation and test is 0.57%,and the radial errors between two-peaks are 0.41%and 0.14%.Therefore,the combination of finite element simulation and dynamic test of MFL signal is a good method to effectively save the test time and cost.

关 键 词：油气管道 有限元仿真 等效磁路 动态测试 

分 类 号：TH49[机械工程—机械制造及自动化] TP273[自动化与计算机技术—检测技术与自动化装置]