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�������պ����ѧѧ�� 2007, Vol. 33 Issue (06) :640-643    DOI:
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Flutter control of aeroelasticity with freeplay nonlinearity
Li Daochun, Xiang Jinwu*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� The question of active futter control of prototypical aeroelastic wing section in subsonic uncompressible flow was investigated. The aeroelastic dynamic model with freeplay nonlinearity in pitch was built using Theodorsen quasi-steady aerodynamic force and moment. Then the control law for flutter suppression was derived via state-dependent Riccati equation. For the synthesis of the controller, only pitch angle and control-surface deflection were measured directly. An observer was constructed to estimate the unavailable state variables of the system. The closed-loop system including the observer and nonlinear controler is asymptotically stable. The simulation results are presented, which show that the observer can give precise estimations for the plunge displacement and the velocities in pitch and plunge, and that the controller is effective for flutter suppression of two-dimensional airfoil with freeplay nonlinearity in pitch.
Keywords�� airfoil   flutter   nonlilnear control system   state estimation     
Received 2006-08-03;
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������Ȼ��ѧ����������Ŀ(10272012);�����������������˲Ż���������Ŀ(NCET-04-0169)

About author: �����(1980-),��,ɽ����ɽ��,��ʿ��,lidc@ase.buaa.edu.cn.
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�����, �����.��϶�������������Բ������[J]  �������պ����ѧѧ��, 2007,V33(06): 640-643
Li Daochun, Xiang Jinwu.Flutter control of aeroelasticity with freeplay nonlinearity[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(06): 640-643
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2007/V33/I06/640
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