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电磁脉冲武器能够通过“前、后门”耦合效应对箱体内部电子元器件及电路板造成损伤,从而对电气电子设备的安全性构成严重威胁,因此,开展箱体电磁屏蔽效能的分析研究具有重要意义.推导了任意入射波条件下电大开孔箱体屏蔽系数的解析解,并在此基础上对箱体屏蔽效能进行了分析研究.首先通过矢量分解,得出任意入射平面波的坐标分量;再基于Cohn模型,获得了电大开孔的等效电偶、磁偶极子;然后通过镜像原理,计算出总的赫兹电矢量位、磁矢量位;最终求得电大开孔箱体内部任意观测点的电场解析解,用于箱体屏蔽系数计算.设计了5组验证性实验,仿真结果表明:该解析算法相对CST的均方误差为11.565 d B,绝对误差为8.015 d B,相关系数为0.921,从而验证了该算法的准确性;解析算法仿真的平均耗时为0.183 s,仅占CST耗时的1/7530,从而验证了该算法的高效性.
The electromagnetic pulse weapon can cause the damage to the electronic components and the circuit board inside the box through the coupling effects of front and rear doors, which pose a serious threat to the safety of electrical and electronic equipment. Therefore, the electromagnetic shielding effectiveness of the box is analyzed Which is of great importance.Analytical solution of the shielding coefficient of an electrically open box with arbitrary incident wave is deduced and the shielding effectiveness of the box is analyzed.First, vectorial decomposition is used to obtain the coordinate component of any incident plane wave Then, based on the Cohn model, the equivalent galvanic couple and magnetic dipole with open hole of the TV set were obtained. Then the total Hertzian vector and magnetic vector bits were calculated by the principle of mirroring. Finally, The analytical solution of the electric field at the observation point is used to calculate the shielding factor of the box. Five sets of confirmatory experiments are designed. The simulation results show that the mean square error of the analytical algorithm relative to CST is 11.565 d B and the absolute error is 8.015 d B. Is 0.921, which verifies the accuracy of the proposed algorithm. The average time-consuming analysis of the algorithm is 0.183s, accounting for only 1/7530 of the CST time-consuming, which verifies the efficiency of the proposed algorithm.