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�������պ����ѧѧ�� 2006, Vol. 32 Issue (01) :61-64    DOI:
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1. �������պ����ѧ ���տ�ѧ�빤��ѧԺ, ���� 100083;
2. ��������ҵ��ѧ �������̼��Զ���ѧԺ, ������ 150001
Aeroservoelastic stability analysis of non-linear structure
Liu Deguang1, Li Chaohui2*
1. School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

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Abstract�� The real aeroservoelastic systems usually have various nonlinear factors, which may induce unnegligible effects on the characteristics of the systems. A frequency-domain method was applied to analyze the aeroservoelastic stability on nonlinear structures with gap. In the equations of motion of the aeroservoelastic system, the nonlinear structural stiffness was transformed to the quasi-linear equivalent stiffness by using the describing function method. The stability and stable margin of the aeroservoelastic system were analyzed by Nyquist method in linear control theory. Numerical calculations were conducted on a controlled wing with flapping gap and rotating gap. The results indicate that the flapping gap is the major factor which affects the stability, and the bigger the flapping gap is, the worse the stability of the system gets.
Keywords�� aeroservoelastic   gap   linearized   stability     
Received 2004-10-12;
Fund:

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About author: ���¹�(1971-),��,�������찲��,��ʦ, liudeguang@buaa.edu.cn.
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���¹�, ���.�����Խṹ�����ŷ������ȶ��Է���[J]  �������պ����ѧѧ��, 2006,V32(01): 61-64
Liu Deguang, Li Chaohui.Aeroservoelastic stability analysis of non-linear structure[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(01): 61-64
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