The shielding effectiveness of steel enclosure for pulsed magnetic field

Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings. Pub Date : 1900-01-01 DOI:10.1109/CEEM.2003.238408

Gao Cheng, Z. Bi-hua, Chen Bin, Shi Lihua, L. Yanxin, Nie Yubao

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引用次数: 2

Abstract

By global analysis of the generator, the loop antenna and the shielding enclosure with the FDTD method, the small-loop approach for measurement of the magnetic field shielding effectiveness was simulated numerically in this paper. Nonuniform meshes and reduced c FDTD method were adopted to solve the contradiction of selecting space step and time step: this makes it possible to calculate the steel shielding efficiency of large dimension. The interaction of shielding enclosure and loop antenna was modeled. The setup of the simulation coincides with the real conditions of engineering testing. The conclusions from the numerical calculation are: the waveform of EMP transparent though the steel shielding enclosure is greatly different from the incident EMP waveform. The rise time changes to be very slow and the width of pulse gets long. The calculating and real testing indicate that the shielding efficiency of the steel enclosure to the EMP with longer rise time (/spl mu/s) and wider duration (1ms) is only about 40 dB, the rise time of transparent pulsed magnetic field reaches ms and the pulse width is more than 10ms. The shielding efficiency of the steel enclosure to low frequency electromagnetic field is much lower.

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钢外壳对脉冲磁场的屏蔽效果

本文采用时域有限差分法对发生器、环形天线和屏蔽罩进行全局分析，对磁场屏蔽效能的小环测量方法进行了数值模拟。采用非均匀网格和简化时域有限差分法解决了空间步长和时间步长选择的矛盾，使计算大尺寸的钢屏蔽效率成为可能。建立了屏蔽罩与环形天线的相互作用模型。仿真结果与工程试验的实际情况吻合。数值计算的结论是:通过钢屏蔽罩透明的电磁脉冲波形与入射电磁脉冲波形有很大的不同。上升时间变慢，脉冲宽度变长。计算和实际测试表明，钢外壳对上升时间较长(/spl mu/s)、持续时间较宽(1ms)的电磁脉冲的屏蔽效率仅为40 dB左右，透明脉冲磁场的上升时间达到ms，脉宽大于10ms。钢外壳对低频电磁场的屏蔽效率低得多。

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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Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.

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