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Analysis of gravity-assist mechanism based on three-dimension elliptic restricted three-body model
Jia Jianhua, Wang Qi*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� A three-dimension elliptic restricted three-body model for the gravity-assist technology in interplanetary exploration was developed based on the planar elliptic restricted three-body model by introducing two extra parameters. By using integrated backward and integrated forward method, the energies and angular momentums of the spacecraft before and after the gravity-assist were obtained. Thus, the orbits can be divided into sixteen different types. The influences of the two extra parameters on the orbit of spacecraft were discussed and the variation laws were summarized. With the Earth-Moon system as an example, the selection region of gravity-assist parameters that can achieve escape and captive was calculated. In addition, the gravity-assist parameters were optimized.
Keywords�� three-dimension elliptic restricted three-body model   gravity-assist   captive   escape     
Received 2011-03-29;
Fund:������Ȼ��ѧ����������Ŀ(10832004)
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�ֽ���, ����.��ά���������������[J]  �������պ����ѧѧ��, 2012,V(7): 981-986
Jia Jianhua, Wang Qi.Analysis of gravity-assist mechanism based on three-dimension elliptic restricted three-body model[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2012,V(7): 981-986
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