摘要
空间高能带电粒子可导致航天器外露介质深层带电,从而对航天器的可靠运行带来潜在威胁。为了考察介质起电规律和最终评估深层带电危害,基于电荷守恒定律,建立了介质深层带电的数学模型,并通过数值求解,实现了对外露介质深层带电的时域3维仿真分析。该模型综合考虑了介质电导率受辐射剂量率、强电场和温度的影响。对典型的天线支撑介质结构进行仿真,结果表明:地球同步轨道环境下外露介质面临着严重的深层带电与介质击穿放电威胁,环境温度是影响外露介质内带电的关键因素。天线支撑结构的局部数10 MV/m以上强电场和10 KV以上高电压,很可能成为航天器表面放电或关键部位功能失常的诱导因素。
Energetic charged particles in space can lead to internal charging of the exposed dielectric of spacecraft and therefore impose a potential threat on the spacecraft＇s operation. In order to investigate the charging characteristics and eventually assess the internal charging hazard, we established a mathematical model for dielectric internal charging based on the law of charge conservation. Through numerical calculation, we carried out three-dimensional simulations of exposed dielectric bulk charging in time domain. This simulation takes into accounts of the dependence of dielectric conductivity on radiation dose rate, intense electric field strength and temperature. The simulation of a typical antenna＇s dielectric bracket shows that the exposed dielectrics in geosynchronous orbit are faced with serious internal charging as well as threats of dielectric breakdown discharge, and environment temperature plays an important role in the internal charging. There could be strong electric filed up to several tens of MV/m and high voltage up to 10 kV at certain locations, which may act as important factors inducing spacecraft surface discharge or even malfunction of critical spacecraft components.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第2期687-692,共6页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(613211)~~
关键词
地球同步轨道
外露介质
介质深层带电
数值仿真
表面放电
航天器
geosynchronous orbit
exposed dielectric
deep dielectric charging
numerical simulation
surface discharge
spacecraft
