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�������պ����ѧѧ�� 2004, Vol. 30 Issue (05) :438-443    DOI:
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Coupled helicopter rotor/propulsion/transmission system torsional vibration analytical model and coupled influence investigation
Xue Haifeng, Xiang Jinwu, Zhang Xiaogu*
School of Aeronautics Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� ��������To get methods avoiding system resonance, a practical analytical model of a helicopter's mechanic system of torsional oscillation was developed. The torsional system consisted of the helicopter's propulsion, the transmission system, the rotor and the tail rotor. The modal properties including modal frequencies and mode shapes of the torsional oscillation system were calculated and analyzed with eigen analysis and impedance matching method. The coupled modal properties were analyzed and compared with the hub fixed isolated rotor and the coupled rotor/propulsion/transmission system. The influence to the isolated blade and the rotor of coupled torsional system though changing rotor speed was gotten. Some effective methods to avoid resonance in designing were given.
Keywords�� helicopters   resonance   characteristic values     
Received 2002-12-04;
About author: Ѧ����(1970-),��,�����γ���,��ʿ��, fenghaixue@eyou.com.
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Ѧ����, �����, ������.ֱ��������/����/����ϵͳģ�ͼ����Ӱ��[J]  �������պ����ѧѧ��, 2004,V30(05): 438-443
Xue Haifeng, Xiang Jinwu, Zhang Xiaogu.Coupled helicopter rotor/propulsion/transmission system torsional vibration analytical model and coupled influence investigation[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(05): 438-443
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2004/V30/I05/438
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