回击电流对雷电远区电磁场多重分形特征的影响

发布时间：2018-01-07 07:25

本文关键词：回击电流对雷电远区电磁场多重分形特征的影响　出处：《高电压技术》2017年03期 　论文类型：期刊论文

【摘要】：针对弯曲通道下回击电流对雷电电磁场波形特征的影响和表征问题,基于偶极子法建立了云地闪随机弯曲通道回击电磁场的计算模型,对不同回击电流波形激发的远区电磁场进行了计算和多重分形分析,获得了观测点方位角和回击电流波形特征对远区电磁场多重分形特征的影响规律。结果表明:雷电远区电磁场的多重分形谱宽度Δα和不对称度B受方位角和回击电流波形的影响要比峰值奇异指数0α明显;回击电流波形的上升时间越大,远区电磁场波形越平滑,对应多重分形谱的峰值奇异指数0α和谱宽度Δα越小,不对称度B越大;回击电流波形的半峰值时间越大,远区电磁场多重分形谱的0α和Δα越小,而B则呈现先减小后增大的趋势。
[Abstract]:The return current curved channel of lightning electromagnetic field waveform characteristics and characterization, the calculation model of random bend channel back flash cloud is built based on the electromagnetic dipole method of the far-field electromagnetic fields of different current excitation are analyzed and multifractal, obtaining the effect of observation azimuth and return current the waveform characteristics of the multifractal characteristics of far-field electromagnetic field. The results show that the influence of the multifractal spectrum of lightning far field width delta alpha and asymmetry of the B by the azimuth and the current peak than the singular index 0 alpha is obvious; the current rise time increases, far field waveform is smooth. The peak of singular index corresponding to the multifractal spectrum of 0 alpha and alpha delta spectral width is small, the greater degree of asymmetry B; the current half peak time is large, far field multiple points The 0 alpha and delta alpha of the shape spectrum are smaller, but the trend of B decreases first and then increases.

【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】：TM15
【正文快照】： 0引言1雷电是自然界中一种具有自组织演化特性的非线性不可逆现象,与分形这种标度行为是密不可分的[1-4]。为获取分形体的结构性质和演化特性,通常的方法是对其进行分形或多重分形分析[5-8]。而雷电回击电磁场作为雷电回击放电过程的重要产物之一,会受到雷电回击电流特性和通

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