【摘要】 实际工况中的管道缺陷是非常复杂的,用物理试验的方法研究各种缺陷漏磁场的变化规律有一定的难度。该文针对油气管道常用的钢管缺陷产生的漏磁场建立了三维有限元模型,采用有限元方法计算了几种相邻缺陷的漏磁场模型,给出了计算结果,并分析了各种相邻缺陷对漏磁场信号的影响。结果表明当相邻缺陷的中心线与磁场方向平行时,对缺陷漏磁信号的影响最小;组合型的缺陷对漏磁信号的影响最大。更多还原

【Abstract】 The magnetic flux leakage (MFL) method is widely used in-line inspection technique for the evaluation of gas and oil pipelines. The actual status of the defects in the pipeline is very complex. It is very difficult to research the changing rule of magnetic flux leakage field by using physics experiment method. In this paper,the MFL signals obtained during the inspection of steel pipelines has been simulated using 3D finite element analysis. The interaction of the adjacent defects has been studied. The numerical simulations imply that the adjacent defects have significant effects on the character of the MFL signals. The results show that the effect is minimal with the parallel alignment defect,and the effect is maximal with the group defect.更多还原