地表垂直分层条件下倾斜通道雷电电磁场特性研究

发布时间：2018-05-30 09:37

本文选题：雷电电磁脉冲场 + 时域有限差分法　；参考：《电子与信息学报》2017年02期

【摘要】：为了得到垂直分层大地电导率和雷电回击通道倾斜角度对雷电电磁脉冲场(LEMP)的影响规律,该文利用时域有限差分法对倾斜通道雷电电磁场进行了建模计算。研究结果表明,当观测点位于倾斜回击通道下方时,地表雷电电磁场峰值会随着回击通道倾斜角度的增加而出现明显的上升,同时电磁场的上升沿变得更加陡峭。观测点与地表雷击点之间的水平距离越大,雷电电磁场的峰值时间也就越大。对地表电磁场而言,观测点同侧大地电导率主要影响雷电水平电场和角向磁场的初始峰值,而观测点另一侧大地电导率的变化则主要影响水平电场和角向磁场波尾幅值。对地下电磁场而言,增加埋地深度对垂直电场的衰减作用十分明显,而对水平电场和角向磁场来说影响极小。
[Abstract]:In order to obtain the influence of the vertical stratified earth conductivity and the tilt angle of the lightning return channel on the lightning electromagnetic pulse field (Lemp), the finite difference time-domain (FDTD) method is used to model and calculate the lightning electromagnetic field in the inclined channel. The results show that the peak value of surface lightning electromagnetic field increases obviously with the increase of the angle of the return stroke channel, and the rising edge of the electromagnetic field becomes more steep when the observation point is below the inclined return stroke channel. The larger the horizontal distance between observation point and surface lightning strike point, the larger the peak time of lightning electromagnetic field. For the surface electromagnetic field, the initial peak value of the horizontal electric field and the angular magnetic field is mainly affected by the same side earth conductivity of the observation point, while the variation of the earth conductivity on the other side of the observation point mainly affects the horizontal electric field and the wave tail amplitude of the angular magnetic field. For the underground electromagnetic field, the attenuation effect of the vertical electric field is obvious by increasing the buried depth, but the effect on the horizontal electric field and the angular magnetic field is very small.
【作者单位】：军械工程学院电磁环境效应国家级重点实验室;
【基金】：国家自然科学基金(51377171)~~
【分类号】：O441.4

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