摘要
为了研究地下防护工程坑道中金属门对电磁波的屏蔽作用,建立了简化的计算模型,以矩形波导中TE10模和TM11模作为激励模式,运用时域有限差分法计算了金属门的屏蔽效能,分析了门框嵌入岩土介质深度、门缝大小以及贯穿导线对屏蔽效能的影响。结果表明,门框嵌入岩土介质一定的深度,可有效提高屏蔽效能;门缝的存在对屏蔽效能有较大影响,门缝大小变化时对屏蔽效能影响不大;门框外侧的贯穿导线对金属门的屏蔽效能影响非常小,贯穿导线越靠近坑道中央,对屏蔽效能的影响越大。
In order to investigate the shielding effect of the metallic door on electromagnetic wave, the model of rectangular tunnel in protection engineering was established. With the FDTD（finite-difference time-domain） method, electromagnetic shielding effectiveness（SE） were studied for the TE10 and TM11 modes. Factors affecting the SE were analyzed. The results indicate that shielding effectiveness is improved when the doorframe is embedded to certain depth in the rock and soil media. The slot on the metallic door degrades the shielding effectiveness, but the shielding effectiveness varies little with different widths of slot. The penetrative wire beside the doorframe has almost no effect on shielding effectiveness and the affection of the wire becomes great when it is close to tunnel＇s center.
出处
《解放军理工大学学报（自然科学版）》
EI
2006年第2期148-152,共5页
Journal of PLA University of Science and Technology(Natural Science Edition)
关键词
电磁波
屏蔽效能
时域有限差分法
electromagnetic wave
SE（shielding effectiveness）
FDTD（finite difference time-domain）
