上海交通大学学报(自然版) ›› 2012, Vol. 46 ›› Issue (05): 750-755.

• 航空、航天 • 上一篇    下一篇

基于反向蒙特卡罗法的飞行器在轨外热流计算

潘晴1,王平阳1,包轶颖2,李鹏2   

  1. (1. 上海交通大学 机械与动力工程学院, 上海 200240;2. 上海宇航系统工程研究所,上海 201108)
  • 出版日期:2012-05-28 发布日期:2012-05-28

On-Orbit External Heat Flux Calculation of Spacecraft Based on Reverse Monte Carlo Method

 PAN  Qing-1, WANG  Ping-Yang-1, BAO  Yi-Ying-2, LI  Peng-2   

  1. (1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;2. Research Institute of Shanghai Aerospace System Engineering, Shanghai 201108, China)
  • Online:2012-05-28 Published:2012-05-28

摘要:  为了计算考虑不同纬度和季节下地球反射率和发射率时的在轨外热流,建立了适用于任意地球轨道和飞行姿态条件下的反向蒙特卡罗(RMC)法计算模型.该模型考虑了卫星表面遮挡与多次反射效应,通过连续坐标变换法确定飞行器在给定轨道参数下任意时刻的姿态,并将假设地球辐射特性为常数时的结果与商业软件的计算结果进行比较,以验证模型和计算程序的正确性.在此基础上,考察了地球辐射特性随纬度变化时,飞行器在轨外热流的变化情况.结果表明,所建立的RMC法模型在飞行器姿态控制以及代码计算中具有一定的可靠性;地球反射率和发射率随纬度的变化对地球红外辐射和地球反射辐射的影响均较大,在所选取的轨道参数和抽查时刻,与反射率和发射率不变的结果的最大相对误差分别为-21.31%和80.05%,且均出现于星下点南纬57°;卫星表面遮挡和多次反射效应明显,天线导致其所在平面的地球反射辐射热流密度从19.2 W/m2变化到39.5 W/m2.

关键词:  , 轨道外热流, 反向蒙特卡罗法, 太阳辐射, 地球红外辐射, 地球反射辐射

Abstract: In order to calculate the orbit external heat flux in consideration of seasonal and latitudinal variations in earth albedo and emission, the reverse Monte Carlo method model was established which can be used in any kind of earth orbit and aircraft attitude. The model also can take surface covering and multiple reflection into account conveniently. The aircraft attitude was determined in term of the given orbit parameters at any time by continuous coordinate transformation method. The results gained on the constant earth radiation characteristics condition were compared with the results gained by commercial software to verify the accuracy of the model. Then, the orbit external heat flux was computed on varying earth radiation characteristics condition. The results display that the model is reliable to aircraft attitude control and external heat flux calculation. Earth infrared emission and earth albedo radiation vary considerably with latitude. The biggest relative difference of earth infrared emission of all check moments is -21.31%, while the biggest relative difference of the earth albedo radiation is 80.05%, both at 57 degree south latitude. The surface covering and multiple reflection effect are obvious, leading to the earth albedo radiation of the surface with an antenna change from 19.2 W/m2 to 39.5 W/m2 as an example.

Key words: on-orbit external heat flux, reverse Monte Carlo (RMC) method, solar radiation, earth infrared emission, earth albedo radiation

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