大尺寸Split型垂直极化有界波EMP模拟器场的特性分析  

Field Characteristics Analysis of Large Split-Type Vertically Polarized Bounded-Wave EMP Simulator

作　　者：朱湘琴[1] 吴伟[1] 谢霖燊[1] ZHU Xiangqin;WU Wei;XIE Linshen(State Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]强脉冲辐射环境模拟与效应国家重点实验室,西北核技术研究所,西安710024

出　　处：《现代应用物理》2023年第1期124-138,151,共16页Modern Applied Physics

基　　金：国家重点研发计划资助项目(2020YFA0709800);国家自然科学基金资助项目(11690040);强脉冲辐射环境模拟与效应国家重点实验室基金资助项目(SKLIPR1601Z)。

摘　　要：采用并行时域有限差分(finite-difference time-domain, FDTD)方法对大尺寸分裂型垂直极化有界波电磁脉冲模拟器(简称“Split型模拟器”)的电场进行模拟,研究分析了该类型模拟器天线的尺寸参数对模拟器内对称剖面上监测点电场垂直分量时域特性的影响,给出了该剖面上电场的瞬态分布特性,并与常规模拟器进行了比较。模拟结果表明:模拟器架高越高,监测点处的电场垂直分量的半高宽出现异常的起始高度越高,且同一监测点电场垂直分量的峰值随模拟器最大高度的增大而减小;距离源越近且距离下极板越近的监测点,电场垂直分量的峰值随整个上极板投影长度的增加有明显的减小;同一监测点电场垂直分量的上升沿会随着模拟器梯形金属板投影长度的增加而减小,峰值随该投影长度的增加而增加;监测点电场垂直分量的半高宽随上极板最大空隙宽度的增加而减小,峰值随上极板最大空隙宽度的增加而减小;当Split型模拟器选择合适的尺寸参数及工作空间高度时,电场垂直分量的上升沿和半高宽均满足IEC61000-4-25标准,且电场垂直分量的峰值与常规模拟器差别不大。Fields of large size split vertically polarized bounded-wave electromagnetic pulse(EMP)simulator(called“Split simulator”)are simulated by using parallel finite-difference time-domain(FDTD)method.The influences of split simulator’s size parameters on the time-domain characteristics of the vertical component electric fields at the testing points on the symmetrical plane in the Split simulator are discussed and analyzed,the study of the transient distribution characteristics of the electric fields’peak-values is given,and the comparison between the Split simulator and normal simulator is also given.The simulation results show that the higher the maxium height of the simulator,the higher the starting height of the testing point where the FWHM of the vertical component of the measuring point field is abnormal,and the peak-value of the vertical component electric field at the same testing point decreases with the increase of the maximum height of the Split simulator.The peak-values of the vertical component electric field at the testing points near the source and the lower plate decrease obviously,as the total upper plate’s projection length increases;The rise-time of the vertical component electric field at the same testing point becomes quickly,and the peak-value increases,as the trapezoid plate’s projection length increases;The FWHM of the vertical component electric field becomes narrower,and the peak-value decreases,as the maximum width of the upper plate’s void increases.Both the rise-time and FWHM of the electric field in the Split simulator meet the IEC standard,and the difference between the peak-values of electric fields in Split simulator and those in normal simulator is little,as appropriate size parameters and appropriate working-space height of the Split simulator are chosen.

关 键 词：分裂型 有界波 垂直极化 电磁脉冲 对称剖面 

分 类 号：TN011[电子电信—物理电子学] O441[理学—电磁学]