旋转壳局部几何缺陷对其频率和振型的影响

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The Effect of Local Geometric Imperfections of Rotational Shell on Its Natural Frequencies and Models

摘要: 本文在文献[7]的基础上,视旋转壳局部几何缺陷为初始位移,形成了子午向局部几何缺陷的附加刚度阵,然后用结构摄动的方法分析了其几何缺陷对系统自然频率及振型的影响。通过算例可知,子午向局部几何缺陷将引起系统频率升高;缺陷幅度越大,频率升高得也越多。

Abstract: In this paper,an additional stiff ness matrix of meridional geometric imperfections was formed by considering the geometric imperfections as initial displacements based on reference[7].Then,natural frequencies and models of rotational shell with symmetric geometric imperfections were analysed by perturbation method.From the computed example,it was known that the effect of geometric imperfections of frequencies is to increase them,and the larger the range of imperfection,the more the frequencies would be increased.

[1]	Engineering Services Department,Imperial Chemical House,The effect of geometric imperfections on collapse of cooling tower,England Structure Engineer,1(1976).
[2]	Croll J.G.A.and K.O.Kemp,Specifying tolerance limits for meridional imperfections in Cooling Tower ACT Journal,January(1979) 139-159.
[3]	Kato,Shiro and Yoshitsura Yokoo,Effect of geometric imperfections on stress distributions in cooling tower,Eng.Struct.,2,July(1980),150-156.
[4]	Croll,J.G.A.,F.Kaleli and K.O.Kemp,A simplified approach to the analysis of geometrically imperfect cooling tower shell,Eng.Struct.,L.January(1977),(92-98).
[5]	AL-Dabbagl,Adam and Ajaya K.Gupta,Meridional imperfection in cooling tower design Journal of the Structural Division ASCE.,105,ST6,Proc.pp.14636,June(1979),1089-1102.
[6]	卢文改等,轴对称几何缺陷对双曲冷却塔壳沐阵风响应的影响,上海工业大学学报,3(1984),15-28.
[7]	卢文达、高世桥,旋转壳局那几阿决陷对其自然频率的影响,1986年全国第二届计算力学议论文,第177号,上海.
[8]	北京大学,《旋转壳的应力分析》,水利电力出版汁出版.
[9]	Stetson,K.A.Perturbation method of structural design relevant to holographic vibration analysis,AIAA J.,13,4(1975).