水平分层大地电导率对倾斜通道LEMP场影响研究

发布时间：2018-01-17 19:00

本文关键词：水平分层大地电导率对倾斜通道LEMP场影响研究　出处：《微波学报》2017年02期 　论文类型：期刊论文

【摘要】：为了得到水平分层条件下,放电通道倾斜角度、大地电导率以及分层土壤厚度对倾斜通道雷电电磁脉冲(LEMP)场的影响规律,在差分条件下对三维直角坐标系的倾斜放电通道加源方程进行了推导,在此基础上利用时域有限差分(FDTD)法对倾斜通道雷电电磁场进行了建模。研究结果表明,当放电通道倾斜角度改变时,雷电电磁场峰值会随着倾斜角度的增加而出现明显的上升,同时观测点与雷击点之间的距离越大倾斜角度对电磁场的影响越明显。当电导率发生改变时,上层电导率主要影响电磁场的峰值,而底层土壤电导率主要影响电磁场的下降沿陡度和波尾幅值,对电磁场峰值影响较小,基本可以忽略。此外,电场波形的下降沿陡度随土壤上层电导率的减小而增加,随下层电导率的减小而降低。当上层土壤厚度改变时,在影响深度范围内电场波尾幅值会随着上层厚度的增加而增加,但电磁场峰值基本不受影响,而且随着水平距离的增加表层土壤的影响深度在不断加大。
[Abstract]:In order to obtain the influence of the angle of the discharge channel, the conductivity of the earth and the thickness of the layered soil on the lightning electromagnetic pulse (LEMPP) field in the horizontal delamination. In this paper, the equation of adding source to the tilted discharge channel in the three-dimensional rectangular coordinate system is derived under the condition of difference. On this basis, the lightning electromagnetic field of inclined channel is modeled by FDTD method. The results show that when the angle of discharge channel is changed. The peak value of lightning electromagnetic field will increase obviously with the increase of tilt angle, and the larger the distance between observation point and lightning strike point, the more obvious the influence of tilt angle on electromagnetic field. The upper layer conductivity mainly affects the peak value of electromagnetic field, while the bottom soil conductivity mainly affects the gradient of electromagnetic field and the amplitude of wave tail, and has little effect on the peak value of electromagnetic field, which can be neglected. The steepness of the electric field waveform increased with the decrease of the conductivity of the upper layer and decreased with the decrease of the conductivity of the lower layer, when the thickness of the upper layer changed. In the range of influence depth, the amplitude of electric field wave tail will increase with the increase of the thickness of the upper layer, but the peak value of electromagnetic field will not be affected, and the influence depth of surface soil will increase with the increase of horizontal distance.
【作者单位】：军械工程学院电磁环境模拟国家级重点实验室;
【基金】：国家自然科学基金(51377171)
【分类号】：O441
【正文快照】： 引言随着电子信息技术的不断发展以及超大规模集成电路的广泛使用,电子元器件的电磁敏感性不断上升,很弱的电磁场就有可能造成比较大的危害。而雷电作为自然界一种典型的强电磁危害源,由其造成的损失也呈逐年增加趋势[1-2]。为更好解决电子器件的雷电电磁脉冲防护问题,必须对

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