CAJ | 학술논문

为分析公众曝露在多个频段磁场中的耦合效应，选取了8/20和10/350两种雷电电磁脉冲耦合波形作为激励源，在分析了二者能量分布规律的基础上，对空间中不同测点的感应磁场进行了计算，探讨了不同材质金属板及钢板网对磁场传播特性的影响。仿真结果表明，雷电电磁脉冲能量主要集中在1MHz以下，屏蔽室结构相对其波长为电小尺寸；不同材质金属板及其工程结构对磁场屏蔽效能影响较小，且与钢板网的效果类似；根据公众曝露限值，在相对激励源波长为电小尺寸的屏蔽室构建中，全封闭式的电磁屏蔽并不必要。
위분석공음폭로재다개빈단자장중적우합효응，선취료8/20화10/350량충뇌전전자맥충우합파형작위격려원，재분석료이자능량분포규률적기출상，대공간중불동측점적감응자장진행료계산，탐토료불동재질금속판급강판망대자장전파특성적영향。방진결과표명，뇌전전자맥충능량주요집중재1MHz이하，병폐실결구상대기파장위전소척촌；불동재질금속판급기공정결구대자장병폐효능영향교소，차여강판망적효과유사；근거공음폭로한치，재상대격려원파장위전소척촌적병폐실구건중，전봉폐식적전자병폐병불필요。
To analyze the coupling effects of public exposure to magnetic field with multiple bands, the lightning electromagnetic pulse coupling waveforms of 8/20 and 10/350 are selected as the exciting source in this paper. Then the induced magnetic field of different points in space is calculated based on the analysis of excitation energy distribution. Moreover, the influence of metal plate with different materials and expanded metal mesh on the magnetic field propagation characteristics is discussed. The numerical results indicate that the energy of lightning electromagnetic pulse is mainly concentrated below 1MHz. The shielding chamber structure is electrically small compared to its wavelength. The shielding effectiveness of different metal plates is similar to that of expanded metal mesh. According to the public exposure limit, and due to the electrical small structure, it shows that totally enclosed shielding on impact laboratory is not necessary.