金属材料中缺陷扰动涡流场的快速重构  

Rapid Reconstruction of Perturbed Eddy Current Field due to Flaw in Metallic Material

作　　者：幸玲玲[1] 黄伟[2] 盛剑霓[1] 

机构地区：[1]西安交通大学,西安710049 [2]集美大学

出　　处：《西安交通大学学报》2000年第2期11-15,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金!资助项目 ( 5 97770 0 3 );中日无损评估中心资助项目

摘　　要：提出了一种快速重构金属材料中缺陷扰动涡流场的新方法.用位于分界面上的多个等效线圈产生的场逼近因缺陷存在引起的扰动场,等效线圈各参数应用最小二乘法确定.这一方法使在逆问题的求解中,每次需用数值方法求解正问题的过程转变为每次用解析法求解正问题.根据各等效线圈参数,快速重构扰动涡流场,使涡流检测中缺陷的重构速度比用体积分方程法提高10倍以上.直线裂缝和十字型裂缝扰动涡流场的重构计算。Presented is an approach for the rapid reconstruction of perturbed eddy current field due to flaw in metallic materials. The disturbed magnetic field is approximated by that produced by coils located at the conductor/air inteface. The equivalent conditions are determined by the least squares method. The forward approach in the inverse problems can then be obtained analytically instead of numerically. The proposed method is more then ten times faster than the volumetric integral equation approach. The reconstruction computations is applied to a straight and a cross cracks for illustrating the efficiency of the method.

关 键 词：涡流检测 缺陷识别 重构速度 金属材料 无损检测 

分 类 号：TG115.284[金属学及工艺—物理冶金]