摘要
地闪回击电磁脉冲(LEMP)具有幅值高、频谱宽和辐射范围广等特点,会与电子电气设备发生电磁耦合,干扰其正常运行甚至造成毁伤,因此,研究LEMP传播特性具有重要意义。然而在进行LEMP特性FDTD分析时,采用均匀网格会使计算区域网格数急剧增加,导致计算出现困难。本文将Huygens亚网格技术引入LEMP传播特性FDTD分析,在靠近回击通道的区域采用细网格,而在远离回击通道的区域采用粗网格,粗细网格间通过Huygens等效面实现电磁耦合,实现了LEMP的广域计算。并将算法用于不同类型、湿度土壤情况下LEMP远距离传播时水平电场Er和垂直电场Ez的影响分析。研究结果可为电磁屏蔽和雷电防护工作提供理论依据。
Cloud-to-ground lightning electromagnetic field(LEMP)has the characteristics of high amplitude,wide spectrum and wide radiation range,which can interfere even damage the normal operation of electronic and electrical equipment through electromagnetic coupling.Therefore,it is of great significance to study the propagation characteristics of LEMP.However,when conducting FDTD analysis of LEMP characteristics,the use of uniform grids will cause a sharp increase in the number of grids in the calculation area,resulting in computational difficulties.In this paper,the huygens subgrid method is introduced to analysis LEMP propagation characteristics,it uses a smaller space step in the area close to the lighting channel,and adoptes a larger space step in other areas,these two parts implement electromagnetic coupling through Huygens surface implemented LEMP wide-area computing.The algorithm is also used to analyze the horizontal electric field Er and the vertical electric field Ez on the long-distance propagation of LEMP under different types and humidity of soil.The results can provide a theoretical basis for electromagnetic compatibility and lightning protection work.
作者
刘育佳
张玉强
LIU Yujia;ZHANG Yuqiang(School of Physics and Electronic Information,Yan’an University,Yan’an 716000,China)
出处
《延安大学学报(自然科学版)》
2025年第2期90-97,共8页
Journal of Yan'an University:Natural Science Edition
基金
国家自然科学基金项目(61961041,62361054,62061048,62461054)
陕西省自然科学基础研究计划项目(2023-JC-YB-539)
榆林市产学研合作项目(CXY-2022-188)。
关键词
雷电电磁脉冲
传播特性
亚网格
时域有限差分法(FDTD)
lightning electromagnetic pulse
propagation characteristics
subgrid
Finite-difference Time-domain(FDTD)
