管道内部漏磁检测的仿真与实验研究

Study on simulation and experiment of magnetic flux leakage inspection for inner pipeline

基于管道漏磁检测原理,以Φ325mm规格的管道内检测器为研究对象,运用有限元分析方法建立漏磁场的数学模型,采用ANSYS软件建立漏磁检测装置的二维实体模型,应用静态磁场仿真方法,计算分析矩形缺陷产生的漏磁信号与磁力线分布。并通过内检测器搭建的漏磁信号检测平台,采集由霍尔传感器阵列采集得到的多通道缺陷漏磁信号,分析对比两组实验数据,结果表明:数值仿真与实验数据的变化趋势一致。

Based on the principle of pipeline＇ s magnetic flux leakage （ MFL）, and the specification Ф325 mm tube detector is used as investigated subject. A mathematical model of MFL field is presented based on the basic theory of finite element （ FE ） analysis, and a two-dimensional entity model of MFL inspection system is also established by ANSYS software to simulate magneto statics, from which MFL signals and the distribution of magnetic line of force produced by rectangle defects are obtained. A workbench for inspection and measurement MFL is built with the tube detector, and the multi-channel flaw leakage signals obtained by the Hall sensor array are gathered, two groups of data are contrasted and analyzed. The experimental results demonstrate that the numerical results a^ree well with the experimental data.