The analytical, numerical and neural network evaluation versus experimental of electromagnetic shielding effectiveness of a rectangular enclosure with apertures

2010 IEEE 9th International Conference on Cyberntic Intelligent Systems Pub Date : 2010-09-01 DOI:10.1109/UKRICIS.2010.5898122

F. Belkacem, M. Bensetti, M. Laour, A. Boutar, M. Djennah, D. Moussaoui, B. Mazari

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引用次数: 7

Abstract

The development and investigation of approximate phenomenological models used to estimate the electromagnetic energy coupling through apertures into enclosures is presented in this paper. Some theoretical aspects of the electromagnetic field penetration into a rectangular enclosure through apertures are reviewed. It is shown that for a simple system topology analytical formulations based on a transmission line model give good predictions of the shielding effectiveness of a rectangular enclosure with apertures. Both the magnetic and electric shielding may be calculated as a function of frequency, enclosure dimensions, apertures dimensions and positions within the enclosure. This analytical approach is validated by comparing the shielding effectiveness predictions with full-field simulations using the finite-difference time-domain technique, software CST and experimental investigations of the shielding effectiveness in a semi anechoic chamber. Industrial needs in terms of EMC require that the experimental results of the shielding effectiveness are accurate for large frequency intervals. To meet this requirement, a neural network based model is used for the implementation of inverse models in order to estimate physical and geometrical parameters of enclosures. In this context an application is considered. It Concerns the evaluation of the shielding effectiveness (SE) parameter as a function of the frequency. During experimental measurements of the SE parameter we did not get enough resolution for intermediate frequencies [17].

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矩形孔罩电磁屏蔽效果的分析、数值和神经网络评价与实验对比

本文介绍了一种近似现象学模型的发展和研究，用于估计电磁能量通过孔进入外壳的耦合。本文综述了电磁场通过小孔穿透矩形外壳的一些理论问题。结果表明，对于一个简单的系统拓扑，基于传输线模型的解析公式可以很好地预测带孔矩形外壳的屏蔽效能。磁屏蔽和电屏蔽都可以作为频率、外壳尺寸、孔径尺寸和外壳内位置的函数来计算。通过时域有限差分技术、CST软件和半消声室屏蔽效果的实验研究，将屏蔽效果预测结果与现场模拟结果进行了对比，验证了该分析方法的有效性。电磁兼容方面的工业需求要求屏蔽效能的实验结果在较大的频率间隔内是准确的。为了满足这一要求，采用基于神经网络的模型来实现逆模型，以估计箱体的物理和几何参数。在这种情况下，将考虑应用程序。它涉及到屏蔽效能(SE)参数作为频率函数的评估。在SE参数的实验测量中，我们没有获得足够的中频分辨率[17]。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 IEEE 9th International Conference on Cyberntic Intelligent Systems

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