摘要
计算模拟是评估航天器介质深层充电危害的重要研究方法之一.通过粒子输运模拟,可以得到特定空间辐射环境下介质中的电荷沉积分布,进而根据电位/电场计算模型,得到深层充电结果.前期研究多是围绕RIC(辐射诱导电导率)模型及其改进模型展开的,而目前通常采用基于电流守恒定律的简单计算模型.为了研究二者关系,给出其各自求解方法,并采用已发表数据对计算结果进行验证;从理论上阐述了后者是RIC模型的进一步简化,只要二者考虑相同的介质电导率,则对应计算结果就是一致的;结合GEO恶劣电子辐射环境下平板介质模型在三类边界条件下的充电情况,进行了充分的仿真验证.相关结论为介质深层充电效应评估提供了有益参考.
It is of great importance to analyze the deep dielectric charging for spacecraft using computer simulation.The general methodology is as follows.The first step is to get the charge deposition in dielectric through particle transport simulation,and then to compute the charged electric potential and electric fields according to the potential computation model.In the preliminary stage,researchers usually employed the RIC model or its improved versions for analysis,whereas the simplified model based on current conservation law has played the dominant role in recent years.In order to study the equivalence between these two classical models,the computation method for each model is presented with verification by comparing the results of a benchmark model with the published results.Then,theoretical analysis is made that the simplified model is a further simplified version of the RIC model,and they can lead to the same charging outcome providing the same total conductivity is used.Finally,through computing the charging process of a dielectric panel with three different grounding conditions under GEO severe electron radiation,sufficient simulation verifications are provided.The obtained conclusions can make beneficial reference for the evaluation of satellite deep dielectric charging.
出处
《空间科学学报》
CAS
CSCD
北大核心
2016年第2期202-208,共7页
Chinese Journal of Space Science
基金
国家自然科学基金项目资助(51577190)
关键词
介质深层充电
RIC模型
电流守恒定律
粒子输运模拟
辐射诱导电导率
Deep dielectric charging
RIC model
Current conservation law
Particle transport simulation
Radiation Induced Conductivity（RIC）
