蒸汽发生器管道涡流检测细小缺陷的计算  

A numerical evaluation of the eddy current tube-flaw detection

作　　者：陈德智[1] 黄振华[1] 廖述圣[2] 聂勇[2] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北武汉430074 [2]核工业部核动力运行研究所,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2007年第8期41-43,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50477045)

摘　　要：对蒸汽发生管道涡流检测中的细孔状缺陷进行了模拟,涡流探头为一对差动式Bobbin线圈.求解过程分为两步:首先分析线圈在无缺陷管道中产生的入射场,然后把缺陷看成一个等效电流源,计算缺陷引起的扰动场.入射场存在解析解,扰动场使用体积分方程法求解.计算结果表明这种方法计算量小,结果正确.The volume integral equation （VIE）method needs meshes only in the flaw volume, thus is fit for the analysis of ECT （eddy current test） problems. A fine hole in a steam generator tube wall was simulated. Being is a pair of difference bobbin coils, ECT probe can be solved through two steps. The eddy current caused by the coils in the tube wall without flaw was obtained by using analytical method. Then the flaw was regarded as an equivalent current source and the resulted perturbation to the eddy current was solved by using VIE method. The impedance changes of the probe were calculated. The results show that the method has good accuracy without complex computation.

关 键 词：涡流检测 数值模拟 体积分方程法 并矢格林函数 

分 类 号：TM35[电气工程—电机]