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�������պ����ѧѧ�� 2011, Vol. 37 Issue (10) :1211-1217    DOI: CNKI:11-2625/V.20111014.0830.002
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��־��1, �1, ��־ΰ2, ������2*
1. �������պ����ѧ ���տ�ѧ�빤��ѧԺ, ���� 100191;
2. �й����չ�ҵ���Ź�˾ ��һ�ɻ�����о�Ժ, ���� 710089
Dynamic response analysis of airdrop for flexible aircrafts
Wu Zhigang1, Yang Chao1, Jing Zhiwei2, Yang Qiuyan2*
1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. The First Aircraft Institute, Aviation Industry Corporation of China, Xi-an 710089, China

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Abstract�� Airdrop of heavy cargos can produce severe dynamic loads. Excitation of the loads have wide band of frequency, which can excite many higher order elastic modes. And the dynamic response may be amplified by the aeroelastic effects. A method of dynamic response analysis of heavy cargo airdrop for flexible aircrafts was presented. The equations of motion of the elastic flexible airplanes were deduced by applying energy method and considering rigid-body modes and elastic modes. The state-space equations of airdrop dynamics were established by applying rational function approximation of unsteady aerodynamics.Airdrop response can be simulated by numerical integration, in which the results of trim analysis were defined as the initial conditions. The numerical simulation of a transport aircraft was presented, and the influence of cargo mass on airdrop dynamic response was studied. Results show that elastic aircrafts have more severe airdrop response than rigid airplanes, and heavier cargo will arouse more severe response. For the aircraft without altitude stabilizer, airdrop will induce a decrease of the flight altitude.
Keywords�� aeroelasticity   flexible aircraft   airdrop   dynamic response     
Received 2010-06-25;
Fund:

������Ȼ��ѧ����������Ŀ(10902006)

About author: ��־��(1977-),��,����Ƽ����,������,wuzhigang@buaa.edu.cn.
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��־��, �, ��־ΰ, ������.���Էɻ�����Ͷ�Ŷ���Ӧ����[J]  �������պ����ѧѧ��, 2011,V37(10): 1211-1217
Wu Zhigang, Yang Chao, Jing Zhiwei, Yang Qiuyan.Dynamic response analysis of airdrop for flexible aircrafts[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(10): 1211-1217
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http://bhxb.buaa.edu.cn//CN/CNKI:11-2625/V.20111014.0830.002     ��     http://bhxb.buaa.edu.cn//CN/Y2011/V37/I10/1211
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