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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >MESSINE, AN EDDY CURRENT PARAMETRIC MODEL FOR FLAW CHARACTERIZATION
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MESSINE, AN EDDY CURRENT PARAMETRIC MODEL FOR FLAW CHARACTERIZATION

机译：MESSINE，一种用于表征跳变的涡流参数模型

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摘要

The MESSINE code (Model for Electromagnetic Simplified Simulation In Nondestructive Evaluation) has been developed at CEA/CEREM in order to characterize flaws in steam generator tubes. No analytical or numerical models, that are well adapted to this problem, have been found in the literature. Constructing a forward model by solving Maxwell's equations seems rather difficult and numerical models (e.g. finite element approach) are not convenient, due to their long computation time. Thus, a new simplified parametric forward model has been constructed using the following three axes : 1. 2D defect-free configurations for studying the detection capabilities, 2. 2D and 3D configurations with defects to obtain signal expertise, 3. defect characterization i.e., eddy current signal inversion. For the defect-free configurations, the analytical solutions based on the Dodd & Deeds' algorithm have been optimized and implemented. For the configurations with defects, the model is built on the Multi-Transformer approximation. The model assumptions are based on the observations of eddy current distributions derived from a 2D and 3D finite element code. A parametric approach is used when necessary in modeling these distributions : the continuous distribution of the induced currents is discretized into elementary current loops, whose shape is parametrized when required. Resistances and mutual and self inductances are computed. Then, for each position of the coil, the intensity of each elementary current loop, the flux through the coil, and finally the impedance can be derived. In 2D, the shape of the induced currents is circular and no parameter is needed. Thus we used such configurations as a first step to validate our modeling concept. Here we present the most important improvements in MESSINE for 2D configurations. Details of the model and comparison with experimental results are given.
机译：CEA / CEREM已开发出MESSINE代码（无损评估中的电磁简化模拟模型）以表征蒸汽发生器管中的缺陷。在文献中没有找到非常适合该问题的分析或数值模型。通过求解麦克斯韦方程组构造正向模型似乎相当困难，并且数值模型（例如有限元方法）由于计算时间长而并不方便。因此，使用以下三个轴构建了新的简化的参数正向模型：1.用于研究检测能力的2D无缺陷配置； 2。具有缺陷以获得信号专业知识的2D和3D配置； 3。缺陷特征即涡流当前信号反转。对于无缺陷的配置，基于Dodd＆Deeds算法的分析解决方案已经过优化和实现。对于有缺陷的配置，该模型基于Multi-Transformer近似建立。模型假设基于对2D和3D有限元代码得出的涡流分布的观察。在对这些分布进行建模时，必要时可使用参数化方法：感应电流的连续分布离散为基本电流环，必要时可对其形状进行参数化。计算电阻，互感和自感。然后，对于线圈的每个位置，每个基本电流回路的强度，通过线圈的磁通以及最终可以得出阻抗。在2D中，感应电流的形状为圆形，不需要任何参数。因此，我们将此类配置用作验证我们的建模概念的第一步。在这里，我们介绍了MESSINE中2D配置中最重要的改进。给出了模型的细节并与实验结果进行了比较。

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