旋转壳局部几何缺陷对其频率和振型的影响

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

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。

In this paper, an additional stiffness matrix of meridional geometric imperfections was formed by considering the geometric imperfections as initial displacements based on literature[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 on frequencies is to increase them, and the larger the range of imperfection, the more the frequencies would be increased.