核电磁脉冲与开孔金属腔体耦合特性研究

发布时间：2019-02-12 09:15

【摘要】：利用基于时域有限差分法(FDTD)的电磁仿真软件XFDTD,研究了核电磁脉冲与开孔腔体的耦合规律。分析了不同极化方向的核电磁脉冲入射时,矩形孔洞长宽比对耦合特性的影响;讨论了核电磁脉冲照射下,腔体谐振和孔缝与腔体的耦合谐振现象;给出了腔体内部电场分布的截面图,讨论了核电磁脉冲入射时腔体内外电场的空间分布情况。研究结果表明:当核电磁脉冲的极化方向与开孔矩形短边平行时,耦合的电场强度比正方形开孔时的要大,且长宽比越大,耦合的电场强度越大;当核电磁脉冲的极化方向与开孔矩形长边平行时,耦合的电场强度比正方形开孔时的小,且长宽比越大,耦合的电场强度越小。极化方向与矩形开孔短边平行时,腔体内产生了腔体谐振和孔缝与腔体的耦合谐振,开孔尺寸的变化会引起谐振频率的偏移;极化方向平行于长边时无明显电磁谐振发生。核电磁脉冲对屏蔽体内的影响主要局限于开孔附近。
[Abstract]:The coupling law between the nuclear electromagnetic pulse and the open cavity is studied by using the electromagnetic simulation software XFDTD, based on the finite-difference time-domain method (FDTD). The effect of the ratio of length to width of a rectangular hole on the coupling characteristics is analyzed when the nuclear electromagnetic pulse with different polarization directions is incident, and the resonance of the cavity and the coupling resonance between the hole and the cavity under the irradiation of the nuclear electromagnetic pulse are discussed. The section diagram of the electric field distribution inside the cavity is given, and the spatial distribution of the electric field inside and outside the cavity is discussed when the nuclear electromagnetic pulse is incident. The results show that when the polarization direction of the nuclear electromagnetic pulse is parallel to the rectangular short edge of the open hole, the coupling electric field intensity is larger than that of the square hole, and the larger the aspect ratio, the greater the coupling electric field intensity. When the polarization direction of the nuclear electromagnetic pulse is parallel to the rectangular long edge of the hole, the coupling electric field intensity is smaller than that of the square hole, and the larger the aspect ratio, the smaller the coupling electric field intensity. When the polarization direction is parallel to the short edge of the rectangular hole, the cavity resonance and the coupling resonance between the slit and the cavity are produced in the cavity, and the deviation of the resonance frequency will be caused by the change of the size of the opening hole, and no obvious electromagnetic resonance occurs when the polarization direction is parallel to the long side. The effect of nuclear electromagnetic pulse on the shielding body is mainly confined to the open hole.
【作者单位】：北京信息科技大学理学院;
【基金】：国家自然科学基金(41375012) 北京市自然科学基金(KZ201411232037)
【分类号】：TN78

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