车辆电控设备不规则腔体的屏蔽效能分析

为有效抑制电磁损伤, 采用TLM（Transmission Line Matrix）算法研究了高空核电磁脉冲作用下线缆孔洞对电子设备屏蔽效能的影响。根据回波强度与反射面形状有关的现象, 提出采用不规则屏蔽腔体对抗电磁毁伤的方法, 通过增强回波减少进入屏蔽腔体内部的电磁波, 并在非屏蔽的车辆中进行验证。仿真结果表明, 不规则腔体的电场屏蔽效能高于圆柱形和矩形屏蔽腔体, 且谐振较小, 验证了该屏蔽腔设计的合理性和有效性, 从而为车辆内部电控系统的防护提供了理论参考。

Analysis of Irregular Cavity Shielding Effectiveness in Vehicles

In order to effectively suppress electromagnetic injury,the electronic products shielding effectiveness of the cable holes was studied by TLM （Transmission Line Matrix）method in HEMP （High-altitude Electromagnetic Pulse）.In view of the echo strength and the reflecting surface shape,an irregular shielding cavity was designed for the first time to resist electromagnetic destruction which can reduce the electromagnetic wave entering cavity by enhancing echo and it was tested in non-shielded vehicles.The simulation results show that the electric shielding effectiveness of irregular cavity is higher than that of the cylindrical and rectangular cavity and the resonator is also small hence rationality and effectiveness of the design were verified which can provide a theoretical reference to the protection of the electronic control system for vehicles.