3rd International Conference on Aeronautical Materials and Aerospace Engineering | |
Use of Tetrahedral Finite Element Method for Computing the Gravitation of Irregular-Shaped Asteroid | |
航空航天工程 | |
Yin, Weidong^1^2 ; Shu, Leizheng^1 ; Yu, Yang^3 ; Gao, Yang^1 | |
Key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing | |
100094, China^1 | |
University of Chinese Academy of Sciences, Beijing | |
100049, China^2 | |
School of Aeronautical Science and Engineering, Beihang University, Beijing | |
100091, China^3 | |
关键词: Comparative studies; Deep-space exploration; Density distributions; Different densities; Gravitational fields; Guidance , navigation , and controls; Navigation strategies; Tetrahedral finite elements; | |
Others : https://iopscience.iop.org/article/10.1088/1757-899X/608/1/012043/pdf DOI : 10.1088/1757-899X/608/1/012043 |
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学科分类:航空航天科学 | |
来源: IOP | |
【 摘 要 】
Asteroids are one of the most important targets for deep space exploration. In previous asteroid missions, the accurate estimate of gravity has proved to have a strong influence on the design of the approach orbit and navigation strategy. The wield gravitational field of an asteroid is mainly caused by the irregular overall shape and possible heterogenous mass distribution the interior. We propose to use the finite element method to compute the gravity of irregularly shaped asteroids; this method combines the advantages of the conventional mascon method and the polyhedral method. The tetrahedral meshes can be generated following the conventional division technique. Taking asteroid 216 Kleopatra as an example, we calculate the exterior gravitational field using the above mentioned methodology. We then compare the results from the finite element method and the polyhedral method under a degenerated case, i.e., with constant density. Then, four different density distribution assumptions are given, and the gravitational fields are calculated respectively. The comparative study and the density distribution assumptions indicate that the proposed method is suitable for modeling an arbitrary asteroid with nonuniform mass distribution. This method is expected to provide reliable gravity data for the design of guidance, navigation, and control systems in future asteroid missions.
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Use of Tetrahedral Finite Element Method for Computing the Gravitation of Irregular-Shaped Asteroid | 2009KB | download |