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弯曲矩形隧道电磁波衰减特性
引用本文:石庆冬,孙继平.弯曲矩形隧道电磁波衰减特性[J].中国矿业大学学报,2001,30(1):91-93.
作者姓名:石庆冬  孙继平
作者单位:中国矿业大学北京校区 机电工程系,
摘    要:实际矿井隧道有许多弯曲段,为实现全矿井的无线移动通信,需要知道在弯曲隧道中电磁波的传播特性,针对简化了的弯曲矩形隧道模型,在柱坐标系直推导出了弯曲矩形隧道中的电磁波模方程,利用Airy函数与柱函数之间的近似关系式,采用抛物线法求解了波模方程,从而得到了在不同条件下的波模衰减系数,由分析可知弯曲隧道的曲率半径越小,即拐弯越急,电磁波衰减越严重;且频率越高,电磁波衰减越大。

关 键 词:弯曲隧道  电磁波模  衰减率  矿井  无线移动通信  波模方程  柱坐标系
文章编号:1000-1964(2001)01-0091-03
修稿时间:2000年6月29日

Attenuation Characteristic of Guided EM Waves in Curved Rectangular Mine Tunnel
SHI Qing-dong,SUN Ji-ping.Attenuation Characteristic of Guided EM Waves in Curved Rectangular Mine Tunnel[J].Journal of China University of Mining & Technology,2001,30(1):91-93.
Authors:SHI Qing-dong  SUN Ji-ping
Abstract:There are many bends in mine tunnels, and it is necessary to know wave propagation characteristic in curved tunnels in order to realize wireless mobile communication of a whole mine. The transmission of electromagnetic waves in a curved mine tunnel was analyzed using a simplified model in a cylindrical geometry. The tunnel cross section was assumed to be rectangular. Mode equations were solved, and the computations of the modal characteristics were facilitated by using Airy function approximations of cylindrical functions. The results indicate that the less the curvature of tunnels and the higher the frequency of electromagnetic waves, the more is the attenuation of electromagnetic waves.
Keywords:curved tunnel  electromagnetic wave mode  attenuation rate
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