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The shielding effectiveness of steel enclosure for pulsed magnetic field

机译：脉冲磁场钢外壳的屏蔽效果

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By global analysis of the generator, the loop antenna and the shielding enclosure with FDTD method, the small-loop approach for measurement of the magnetic field shielding effectiveness was simulated numerically in this paper. Non-uniform 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 condition of engineering testing. The conclusions from the numerical calculation are: The waveform of EMP transparent though the steel shielding enclosure is greatly different with 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 steel enclosure to the EMP with longer rise timers ) and wider duration(1ms) is only about 40dB, 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.
机译：通过对发电机的全局分析，环形天线和具有FDTD方法的屏蔽外壳，在本文中数量地模拟了用于测量磁场屏蔽效果的小环路方法。采用非均匀网格和减少的C FDTD方法来解决选择空间步骤和时间步骤的矛盾，这使得可以计算大维的钢屏蔽效率。建模屏蔽外壳和环路天线的相互作用。模拟的设置与工程测试的真实条件一致。来自数值计算的结论是：EMP透明的波形透明，但钢屏蔽外壳与入射EMP波形大大不同。上升时间变化为非常慢，脉冲的宽度变长。计算和实际测试表明，钢机箱与较长升高定时器的EMP的屏蔽效率）和更宽的持续时间（1ms）仅为40dB，透明脉冲磁场的上升时间达到MS，脉冲宽度超过10ms 。钢外壳到低频电磁场的屏蔽效率远低得多。

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