Calculation of external heat fluxes on space camera with changing attitudes frequently in Geomagnetic Coordinate system

Yang Huabin; Wu Qingwen; Chen Liheng; He Fei; Zhang Xusheng

In order to provide the external heat flux of space camera accurately, a method was proposed to calculate the instantaneous external heat fluxes of a space camera with changing attitudes frequently depending on its position in the Geomagnetic Coordinate system(MAG). First, in J2000 Coordinate the relative position of the sun, earth and radiation intensity of sun was calculated. Second, geomagnetic latitudes of a camera and orbital times when camera entered or exited from high geomagnetic latitudes(|L|60) were calculated. Then, the camera's attitudes were ensured with geomagnetic latitudes. Finally, orbital view factors of six mapping planes were achieved by the Monte Carlo Method(MCM)and the instantaneous external heat fluxes was obtained during the on-orbit time. The external heat fluxes of this paper were consentaneous with the software IDEAS/TMG. Compared with the stable attitude camera, the attitude varieties of the camera take a relatively strong influence on the external heat flux, especially for the +Z-direction where optical entrance is located. The fluctuation range of the +Z-direction external heat flux is about 0-1 245.4 W/m2.

1. Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;

2. University of Chinese Academy of Sciences,Beijing 100049,China

Received Date: 2014-10-13

Rev Recd Date: 2014-11-25

Publish Date: 2015-06-25

Key words:

Abstract: In order to provide the external heat flux of space camera accurately, a method was proposed to calculate the instantaneous external heat fluxes of a space camera with changing attitudes frequently depending on its position in the Geomagnetic Coordinate system(MAG). First, in J2000 Coordinate the relative position of the sun, earth and radiation intensity of sun was calculated. Second, geomagnetic latitudes of a camera and orbital times when camera entered or exited from high geomagnetic latitudes(|L|60) were calculated. Then, the camera's attitudes were ensured with geomagnetic latitudes. Finally, orbital view factors of six mapping planes were achieved by the Monte Carlo Method(MCM)and the instantaneous external heat fluxes was obtained during the on-orbit time. The external heat fluxes of this paper were consentaneous with the software IDEAS/TMG. Compared with the stable attitude camera, the attitude varieties of the camera take a relatively strong influence on the external heat flux, especially for the +Z-direction where optical entrance is located. The fluctuation range of the +Z-direction external heat flux is about 0-1 245.4 W/m2.

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Reference (17)

[1]
[2]	Li Junlan, Yan Shaoze, Cai Renyu. Thermal analysis of composite solar array subjected to space heat flux[J]. Aerospace Science and Technology, 2013, 27: 84-94.
[3]	Qin Wenbo, Cheng Huier. Thermal analysis of docking mechanism at the tail of space laboratory during orbit changing[J]. Journal of Astronautics, 2009, 30(3): 1276-1281. (in Chinese) 秦文波, 程惠尔.空间实验室尾部对接机构变轨期间热分析研究[J].宇航学报, 2009, 30(3): 1276-1281.
[4]
[5]
[6]	Weng Jianhua, Pan Zengfu, Min Guirong. A method of calculating external heat fluxes on arbitrary shaped convex surface of spacecraft[J]. Chinese Space Science and Technology, 1994, 2: 11-18. (in Chinese) 翁建华, 潘增富, 闵桂荣.空间任意形状凸面的轨道空间外热流计算方法[J].中国空间科学技术, 1994, 2: 11-18.
[7]	Ning Xianwen, Zhang Jiaxun, Jiang Hai, et al. Extreme external heat flux analytical model for inclined-orbit hexahedral[J]. Journal of Astronautics, 2008, 29(3): 754-759. (in Chinese) 宁献文, 张加迅, 江海, 等.倾斜轨道六面体卫星极端外热流解析模型[J].宇航学报, 2008, 29(3): 754-759.
[8]
[9]
[10]	Zhang Tao, Sun Bing. Numerical computation of external heat flux of low earth orbit spacecraft by RUD[J]. Journal of Astronautics, 2009, 30(1): 338-343. (in Chinese) 张涛, 孙冰. 计算近地轨道航天器空间外热流的RUD方法[J]. 宇航学报, 2009, 30(1): 338-343.
[11]
[12]	Sun Chuang, Xia Xinlin, Dai Guilong. A calculational method for environment heat flux on spacecraft with complicated structure[J]. Journal of Astronautics, 2011, 32(3): 683-687. (in Chinese) 孙创, 夏新林, 戴贵龙.飞行器复杂外结构的环境热流计算方法[J].宇航学报, 2011, 32(3): 683-687.
[13]	Xi Xiaoning, Wang Wei. Fundamentals of Near-earth Spacecraft Orbit[M]. Changsha: National University of Defense Technology Press, 2003. (in Chinese) 郗晓宁, 王威. 近地航天器轨道基础[M]. 长沙: 国防科技大学出版社, 2003.
[14]
[15]
[16]	Finlay C C, Maus S, Beggan C D, et al. International geomagnetic reference field: the eleventh generation[J]. Geophysical Journal International, 2010, 183: 1216-1230.
[17]	Tan Heping, Xia Xinlin, Liu Linhua, et al. Numercial Calculation of Infrared Radiation Properties and Transfer[M].Harbin: Harbin Institude of Technology, 2006. (in Chinese) 谈和平, 夏新林, 刘林华, 等.红外辐射特性与传输的数值计算[M].哈尔滨: 哈尔滨工业大学出版社, 2006.

Calculation of external heat fluxes on space camera with changing attitudes frequently in Geomagnetic Coordinate system

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