摘要
将航天器模型简化为含环形缝隙和内支柱结构的重入腔,利用3维共形PIC程序UNIPIC-3D对重入腔在X射线辐照下的系统电磁脉冲(SGEMP)环境及耦合现象进行了模拟计算。计算结果表明,SGEMP易与重入腔的环形缝隙发生耦合而进出腔体,总电磁场可由腔内外发射面分别产生的电磁场线性叠加获得;脉冲射线作用结束后,重入腔的缝隙及腔内支柱附近仍存在幅值较大且随时间衰减的阻尼电磁波;环形缝隙附近的电磁脉冲受到缝隙宽度或几何因子的影响,幅值、频率和波形会发生变化。
A simplified spacecraft model,i.e.a reentrant cavity with annular seam and internal shaft,is employed to simulate and study system-generated electromagnetic pulse(SGEMP)and its field-coupling under the radiation of X-ray in this paper,using the 3-D conformal particle-in-cell(PIC)code UNIPIC-3D.The computation results indicate that such an easy field-coupling that EMP may enter or escape from the cavity without restriction will happen when SGEMP reaches the annular seam.In this case,the total electromagnetic fields can be acquired linearly by adding the EMPs derived from the external and internal emitting surface,separately.Meanwhile,after the radiation pulse,there still exit electromagnetic fields under damped oscillation,which are with high amplitude,near the annular seam and internal shaft of the reentrant cavity.Moreover,the amplitude and the waveform or frequency of the electromagnetic pulse near the annular seam will change under the impact of the change of the annular seam or the geometrical factor.
作者
陈剑楠
张俊杰
CHEN Jian-nan;ZHANG Jun-jie(Northwest Institute of Nuclear Technology,Xi’an 710024,China)
出处
《现代应用物理》
2021年第4期85-92,共8页
Modern Applied Physics
基金
国家重点研发计划资助项目(2020YFA0709800)
强脉冲辐射环境模拟与效应国家重点实验室专项基金资助项目(SKLIPR1601Z)。
关键词
系统电磁脉冲
PIC
场耦合
几何因子
防护设计
system-generated electromagnetic pulse
PIC
field-coupling
geometrical factor
protection design
