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�������պ����ѧѧ�� 2011, Vol. 37 Issue (9) :1156-1159    DOI:
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Three analysis models of torsional frequency of stiffening cylindrical shell
Pan Zhongwen, Xing Yufeng, Yang Yang*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� For simplifying the analysis of stiffening cylindrical shell in rocket, the computational method of torsional rigidity in the area-equivalence method was studied for the stringers in stiffening cylindrical shell, it is shown that the effect of stringers on the torsional rigidity of stiffening cylindrical shell is negligible. The equivalent beam or shell model with uniform thickness, the equivalent shell model with varied thickness and three dimensional (3-D) beam-shell model were proposed to solve the inherent torsional vibration frequency, and the features of these models were discussed. It was theoretically revealed that the obtained equivalent thickness by the area-equivalence method could not be directly used to calculate the torsional rigidity. Two modification methods, namely, the rigidity reduction method and frequency modified method, were presented when the equivalent thickness was directly utilized to solve the torsional frequencies. Numerical comparisons validate the proposed methods and models.
Keywords�� cylindrical shell   stringer   rocket   torsional frequency     
Received 2010-05-11;
About author: ������(1966-),��,����������,��ʿ��,zhwpan@sina.com.
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������, ������, ����.��Ƥ�ӽ�Բ����ŤתƵ�ʵ����ּ���ģ��[J]  �������պ����ѧѧ��, 2011,V37(9): 1156-1159
Pan Zhongwen, Xing Yufeng, Yang Yang.Three analysis models of torsional frequency of stiffening cylindrical shell[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(9): 1156-1159
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