管道缺陷漏磁检测的三维有限元仿真分析  

Research on Numerical Simulation of Three-dimensional Magnetic Flux Leakage Inspection of Pipeline Defects

作　　者：郑彪华[1] 何文[1] 周松强[2] 张春雷[1] 高忠[3] 

机构地区：[1]江西理工大学工程研究院,江西赣州341000 [2]中国船舶重工集团公司第701研究所上海分部,上海201102 [3]江西理工大学资源与环境工程学院,江西赣州341000

出　　处：《中国安全科学学报》2013年第12期35-41,共7页China Safety Science Journal

基　　金：江西省自然科学基金资助(20132BAB216019);江西省教育厅科技项目(GJJ13399);江西理工大学校级课题(jxxj11127)

摘　　要：为研究运输管道缺陷的漏磁（MFL）信号特征，采用ANSYS软件进行管道缺陷漏磁检测的三维有限元数值仿真。首先建立漏磁检测分析装置的数值模型，进行三维静态情况的数值计算，获得不同缺陷所产生的漏磁信号，然后将这些数据与试验结果进行比较分析。在此基础上，分析缺陷深度、缺陷直径以及传感器提离值对漏磁信号参数的影响。结果表明：磁通密度轴向分量By的幅值能够用于衡量缺陷的深度，可依据By的宽度和磁通密度径向分量Bx的峰峰间距来定量识别缺陷直径；传感器的提离值对缺陷漏磁场的影响很大，为使测得的漏磁信号可靠并能测得深度较小的缺陷，传感器的提离值应设定为1．5～3mm。Three-dimensional numerical simulation was conducted to study signal characteristics of mag- netic flux leakage inspection of pipeline defects, Firstly, a finite element model of MFL detection system was built adopting ANSYS program to simulate the three dimensional static situation, from which MFL sig- nals produced by different defects were obtained. Then a comparison was made between simulation results and experimental ones. Base on that, the relation between defect parameters and MFL signals was ana- lyzed. Results show that amplitude of axial component of magnetic flux density By is suitable for identifying defect＇s depth, and diameter of defect could be tested using the width value of Br and peak to peak value of radial component of magnetic flux density Bz, and that transducer＇s life-off value has a great effect on defect＇s leakage magnetic field and its value should be set at 1.5 -3 mm so as to indentifv small defects.

关 键 词：管道 缺陷 漏磁(MFL)检测 有限元分析 ANSYS 磁通密度 提离值 

分 类 号：X924.4[环境科学与工程—安全科学] TP274[自动化与计算机技术—检测技术与自动化装置]