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�������պ����ѧѧ�� 2010, Vol. 36 Issue (11) :1373-1377    DOI:
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Dynamic and flutter analysis of long-straight-wing based on equivalent beam model
Zhang Xu, Wu Zhigang, Yang Chao*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� For a complex structure of multiple degrees of freedom (DOF), building a simplified model of equivalent structure can lead to rapid and effective structural analysis. The method of energy equivalence was used to make a long-straight complex structure of multiple DOF equivalent to a beam element in space, the stiffness and inertia characteristics of the equivalent beam were derived, and the total stiffness matrix and mass matrix were obtained by using the finite element method. For a wing model, using the equivalence method, stiffness values and inertia values of the equivalent beam had been gotten. Analysis of vibration and flutter was carried out, and their respective results were separately compared with the calculation results of MSC Nastran. The contrast shows that the equivalent modeling method significantly reduces the structural DOF, and that the relative errors of results are small. And its main parameter values can be conveniently modified. Therefore, the method can be applied to preliminary design and structural optimization design of aircraft.
Keywords�� equivalent beam   wing   degree of freedom   vibration characteristics   flutter characteristics     
Received 2009-10-12;


Corresponding Authors: ����     Email: zhangxu250819185@163.com
About author: �� ��(1985-),��,�ӱ���ˮ��,˶ʿ��,zhangxu250819185@163.com.
����, ��־��, �.���ڵ�Ч��ģ�͵ij�ֱ������ѧ��������[J]  �������պ����ѧѧ��, 2010,V36(11): 1373-1377
Zhang Xu, Wu Zhigang, Yang Chao.Dynamic and flutter analysis of long-straight-wing based on equivalent beam model[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2010,V36(11): 1373-1377
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