【作者】 周飞；

【导师】 高金峰；

【作者基本信息】 郑州大学 ， 电工理论与新技术， 2011， 硕士

【摘要】 电磁脉冲可以通过“前门”耦合和“后门”耦合两种方式进入目标腔体内对电子设备产生影响。“前门”耦合比较容易防护,“后门”耦合对系统的影响几乎不能完全消除,是对系统正常工作的最主要威胁。孔缝耦合是电磁脉冲通过“后门”进入目标系统的主要途径之一,是电磁脉冲应用、电磁防护和电磁兼容研究的关键问题。本文采用基于时域有限差分方法的模拟软件CST为工具,通过建立模型,研究了电磁脉冲通过屏蔽体孔缝时的耦合效应。具体情况如下：(1)对屏蔽体内耦合场分布情况进行研究,结果表明：孔缝中心轴线上的耦合场强远大于非中心轴线上的耦合场强,且在孔缝非中心轴线上存在谐振信号。(2)对单孔时孔缝形状、孔缝面积、孔缝位置、孔缝纵横比等对耦合特性的影响进行了比较分析,结果表明：孔缝面积一定时,孔缝为正方形和圆形时耦合场强相对较小；孔缝的面积越大,耦合进入腔体内的场强也越大；孔缝在入射面中央产生的耦合场强大于孔缝在入射面边沿时的耦合场强；入射波极化方向与孔缝的横边平行时,耦合场强随纵横比的增大而相应增大。(3)对多孔时孔缝数量、孔阵间距、孔阵排列方式对耦合特性的影响进行了比较分析,结果表明：孔缝总面积一定的情况下,开孔数量越多,耦合场强越小；孔阵间距越大,耦合场强越小；孔阵错排要优于孔阵顺排。(4)对同体积不同形状的屏蔽体开有相同孔缝时的耦合特性进行比较分析,结果表明：正方体、圆柱体腔体内的耦合场强小于长方体。(5)综合比较分析了核电磁脉冲(NEMP)、快速上升沿脉冲(FREMP)、超宽带脉冲(UwB)三种典型强电磁脉冲通过较小屏蔽腔体孔缝时的耦合特性。本文对电磁脉冲通过屏蔽体孔缝时的耦合特性进行了多方位分析。相关结论对屏蔽体的设计以及电磁防护有一定的参考价值。更多还原

【Abstract】 Electromagnetic pulse through the "front door" coupling and "back door" coupling into the target chamber, the "front door" coupling is easier to be protected, the "back door" coupling effect on the system can hardly be completely eliminated, and it’s the main threat to the system. Aperture coupling is one of the main ways of the electromagnetic pulse into the target system and is the key issues of electromagnetic pulse applications, system’s electromagnetic protection and system electromagnetic compatibility.By establishing model, this paper uses the simulation software CST which is based on the FDTD method as a tool to study the coupling effect of the electromagnetic pulse through the shield’s aperture. The contents is something as follows:(1)We analysis the coupled field distribution of the shield, the results showed that:the coupling field on the central axis of the aperture is much stronger than on the non-central axis of the aperture, but there is also resonance signal on the non-central axis of the aperture.(2)We comparative analysis the coupling characteristics of the aperture shape, aperture size, aperture location, aperture aspect ratio, the results showed that:when the aperture area is certain, the square and circular aperture’s coupling field is smaller; when the aperture’s area is greater, the coupling of the field into the chamber is greater; when the aperture in the central of incident plane, the coupling field is lager than the aperture in the edge of incident plane; when the incident polarization direction parallel to the transverse edge of the aperture, the coupling field increases with the aspect ratio increases;(3)We comparative analysis the coupling characteristics of aperture number, hole array pitch, aperture array arrangement, the results showed that:when the total area of the aperture is certain, The more holes, the coupling field strength is smaller; the Larger aperture array spacing, the coupling field strength is smaller; Aperture array staggered is better than aperture array aligned. (4) We comparative analysis the coupling characteristics of different shapes with the same volume and the same aperture, the results showed that:in the cube and cylinder chamber, the coupling field strength is less than in the rectangular.(5)We analysis coupling characteristics of three typical electromagnetic pulses: the nuclear electromagnetic pulse (NEMP), fast rising pulse (FREMP), ultra-wideband pulse (UWB) through the small shield’s aperture.This paper did multidimensional analysis on coupling characteristics of the electromagnetic pulse through the shield’s aperture. The conclusions have some reference value on the shield design and electromagnetic protection.更多还原