远场涡流三维缺损响应的仿真研究

应用有限元方法，采用Ａ，Ｖ－Ａｓ－ψ位函数计算并结合三维场数值计算中的子结构－波阵法，给出了一种能在微机上对远场涡流的三维缺损响应的进行仿真的方法，同时重点研究了相同体积的周向和轴向缺损响应信号及管中涡流分布。研究结果表明，轴向缺损引起的涡流畸变小于周向缺损时的变化，故周向缺损响应信号大于轴向缺损的响应信号。

SIMULATION RESEARCH OF 3D DEFECT RESPONSE FOR REMOTE FIELD EDDY CURRENT NONDESTRUCTIVE TEST

The remote field eddy current (RFEC) technique is a new type of inspection technique for pipelines inspection which is not influenced by skin effect. However, up to date, the physics research of RFEC has not been finished thoroughly and some phenomena are still unsolved and unexplained. In this paper the A, V-As- model and substructure-front technique are presented in FEM,and the simulating method on microcomputer ic also given for 3D RFEC defect response analysis. The obtained results show that,since the change of eddy current distribution surrounding the circumferential defect is more stronger than that of axial defect, the signal of circumferential defect response is therefore stronger than that of axial defect.