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A Domain Decomposition Finite-Element Method for Eddy-Current Testing Simulation

机译：涡流测试仿真的区域分解有限元方法

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摘要

A typical eddy-current testing (ECT) process involves scanning of conducting test sample using an EC probe, which can be an air-core coil or ferrite-core coil. Its accurate and efficient modeling is critical to probe and testing parameter optimization. The finite-element method (FEM) has been widely used in ECT simulation. Unfortunately, the conventional FEM is cumbersome and inefficient when the movement of a ferrite-core coil is to be considered, because the change of the coil position results in repetition of meshing as well as generating and preconditioning matrix equation. In this paper, we resolve the problem by dividing the solution domain into subdomains. The test sample and the ferrite core are assigned to different subdomains, and each subdomain is meshed independently. The excitation coil is not included in a subdomain, and its contributions to the magnetic fields in both subdomains are calculated analytically. Solutions of the subdomains are coupled by calculating the contribution of the induced current or magnetization current in a subdomain to the magnetic field in the other subdomain. The proposed method has the merits of easy mesh generation and efficient and accurate solution.
机译：典型的涡流测试（ECT）过程涉及使用EC探头扫描导电测试样品，该探头可以是空心线圈或铁氧体线圈。其准确而有效的建模对于探测和测试参数优化至关重要。有限元方法（FEM）已被广泛应用于ECT仿真中。不幸的是，当要考虑铁氧体磁心线圈的运动时，传统的有限元法既麻烦又效率低下，因为线圈位置的变化会导致啮合的重复以及矩阵方程的生成和预处理。在本文中，我们通过将解决方案域划分为子域来解决该问题。将测试样品和铁氧体磁芯分配给不同的子域，并且每个子域都独立地划分网格。励磁线圈不包含在子域中，并且通过分析计算出它对两个子域中的磁场的贡献。通过计算子域中的感应电流或磁化电流对另一个子域中的磁场的贡献来耦合子域的解。所提出的方法具有易于生成网格和高效且精确的解决方案的优点。

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