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| 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. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;2. Research Institute of Shanghai Aerospace System Engineering, Shanghai 201108, China) |
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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.
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Published: 28 May 2012
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