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�������պ����ѧѧ�� 2008, Vol. 34 Issue (06) :634-637    DOI:
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��ͦ1, ������1, ����2*
1. �������պ����ѧ ���տ�ѧ�빤��ѧԺ, ���� 100191��
2. �鶼���չ�ҵ����, �ϲ� 330024
Longitudinal stability of an agriculture aircraft during low-altitude flight operation
Yue Ting1, Wang Lixin1, Kuang Long2*
1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. Hongdu Aviation Industry Group, Nanchang 330024, China

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Abstract�� The longitudinal aerodynamics of agriculture aircraft during low-altitude flight operation was analyzed. And the longitudinal static stability criterion in ground effect was discussed, including the effects of major aerodynamic derivatives on longitudinal static stability. By the five-order small-disturbance linear equation in ground effect, the influence on the mode properties of agriculture aircraft during low-altitude flight operation was computed. And the approach of mode vectors was used to investigate the dynamic stability, which is useful to understand the major variables acting in different modes. The longitudinal dynamic stability was analyzed by Routh's criteria. To ensure dynamic stability, the favorable position of the center of gravity was deduced by approximations. The results show that the longitudinal aerodynamics and stability influenced by ground effect should not be ignored for the agriculture aircraft during low-altitude flight operation.
Keywords�� agriculture aircraft   low-altitude flight   ground effect   longitudinal stability     
Received 2007-05-22;
About author: �� ͦ(1982��),��,����ͨɽ��,��ʿ��,yueting_buaa@sina.com.
��ͦ, ������, ����.ũ�ַɻ�������ҵ���е������ȶ�����[J]  �������պ����ѧѧ��, 2008,V34(06): 634-637
Yue Ting, Wang Lixin, Kuang Long.Longitudinal stability of an agriculture aircraft during low-altitude flight operation[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(06): 634-637
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2008/V34/I06/634
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