基于蒙特卡罗射线追踪的航天器空间环境因素暴露通量统一计算方法

General algorithm for calculating space environmental exposure flux based on Monte-Carlo ray tracing

航天器空间环境效应分析评估的首要条件是获取空间环境因素的暴露通量.文章分析总结了蒙特卡罗方法在原子氧、微流星体、太阳光压、气动力、辐射剂量、材料放气污染等环境因素暴露通量计算中的应用,提出基于蒙特卡罗射线追踪方法实现统一的空间环境因素暴露通量计算,并给出计算流程及初步验证.统一算法的计算结果与理论值(或文献值)符合较好,证明其能够正确计算环境因素暴露通量.

The orbital spacecraft is influenced by the space environment,which would cause the performance degradation of the spacecraft or its subsystems,even the mission failure.Therefore it is necessary to analyze and evaluate the space environmental effects,among which the primary concern is to determine the exposure flux of the space environmental factors.In this paper,the Monte-Carlo method is applied in the calculation of the exposure flux of the space environmental factors,such as the atomic oxygen,the micrometeoroid,the solar pressure,the atmospheric drag,the radiation dose,and the outgassing contamination.A general algorithm of calculating the exposure flux based on the Monte-Carlo ray tracing is proposed,and the calculation procedure is described.The new algorithm is verified through test cases.It is shown that the calculation results with the general algorithm are in good agreement with theoretical or reference values.