Combined method for fast 3-D finite element modeling of nondestructive testing signal

无损检测信号快速三维有限元模拟的组合方法(英文)

A combined method for the fast 3-D finite element modeling of defect responses in nondestructive testing of electromagnetics is presented. The method consists of three numerical techniques: zoom-in technique, difference field technique and iterative solution technique. Utilizing the zoom-in technique, the computational zone focuses on a relatively small domain around the defect. Employing the difference field technique, the axisymmetrical field solution corresponding to the case with no defect can be used to simplify the mesh generation and obtain the modeling results quickly. Using the iterative solution technique, the matrix equation system in the 3-D finite element modeling of nondestructive probe signals can easily be solved. The sample calculation shows that the presented method is highly effective and can consequently save significant computer resources.

提出了一种基于三维有限元的电磁无损检测缺损响应快速模拟的组合方法 ,该方法由三项技术构成 ,分别是局部计算技术、差场技术和迭代解技术 .采用局部计算技术 ,可以将三维计算区域限制在缺损附近的一个较小范围 ;使用差场技术 ,无缺损情形下的轴对称解可以用来简化三维网格生成以及快速获得三维解答 ;而应用迭代解技术 ,可以加速无损探头信号有限元模拟的矩阵方程求解 .实例计算表明本文方法是正确有效的 ,可以节省大量的计算机资源 .