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�������պ����ѧѧ�� 2009, Vol. 35 Issue (6) :718-722    DOI:
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Influence of chordwise bending stiffness on aeroelastic characteristics of flexible high-aspect-ratio wing
Leng Jiazhen, Xie Changchuan, Yang Chao*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� High-aspect-ratio wing with low sweepback has been widely adopted by high-altitude long-endurance (HALE) aircrafts, and the wing boasts large deformation due to flight load. The coupling of stiffness between chordewise bending and torsion is intensified by the geometric nonlinearity, and chordwise bending mode plays key role in affecting the aeroelastic characteristics of the wing. Linearization of the structure was performed near its static equilibrium state under specific attack angle. Natural frequencies and mode shapes of the deformed wing were obtained, while the unsteady aerodynamics of the curved wing was calculated through strip theory. The flutter speed was determined by p-k method. Through the calculation of a metal beam wing, it can be concluded that there is a lower flutter speed with chordwise bending mode involved in coupling than without. Increase of chordwise bending stiffness is helpful for raising this flutter speed, and the effect of the torsional frequency should also be considered.
Keywords�� aerodynamics-flutter   aeroelasticity   geometric nonlinearity   high-aspect-ratio wing   chordwise bending stiffness     
Received 2008-05-23;


About author: �����(1984-),��,ɽ����ɽ��,��ʿ��,qoo-ljz@hotmail.com.
�����, л����, �� ��.ˮƽ�����նȶԴ�չ�ұȻ�������Ӱ��[J]  �������պ����ѧѧ��, 2009,V35(6): 718-722
Leng Jiazhen, Xie Changchuan, Yang Chao.Influence of chordwise bending stiffness on aeroelastic characteristics of flexible high-aspect-ratio wing[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(6): 718-722
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