本文選題：雷電電磁脈沖場(chǎng) + 時(shí)域有限差分法　； 參考：《電子與信息學(xué)報(bào)》2017年02期

【摘要】：為了得到垂直分層大地電導(dǎo)率和雷電回?fù)敉ǖ纼A斜角度對(duì)雷電電磁脈沖場(chǎng)(LEMP)的影響規(guī)律,該文利用時(shí)域有限差分法對(duì)傾斜通道雷電電磁場(chǎng)進(jìn)行了建模計(jì)算。研究結(jié)果表明,當(dāng)觀測(cè)點(diǎn)位于傾斜回?fù)敉ǖ老路綍r(shí),地表雷電電磁場(chǎng)峰值會(huì)隨著回?fù)敉ǖ纼A斜角度的增加而出現(xiàn)明顯的上升,同時(shí)電磁場(chǎng)的上升沿變得更加陡峭。觀測(cè)點(diǎn)與地表雷擊點(diǎn)之間的水平距離越大,雷電電磁場(chǎng)的峰值時(shí)間也就越大。對(duì)地表電磁場(chǎng)而言,觀測(cè)點(diǎn)同側(cè)大地電導(dǎo)率主要影響雷電水平電場(chǎng)和角向磁場(chǎng)的初始峰值,而觀測(cè)點(diǎn)另一側(cè)大地電導(dǎo)率的變化則主要影響水平電場(chǎng)和角向磁場(chǎng)波尾幅值。對(duì)地下電磁場(chǎng)而言,增加埋地深度對(duì)垂直電場(chǎng)的衰減作用十分明顯,而對(duì)水平電場(chǎng)和角向磁場(chǎng)來說影響極小。
[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.
【作者單位】： 軍械工程學(xué)院電磁環(huán)境效應(yīng)國家級(jí)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(51377171)~~
【分類號(hào)】：O441.4

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