肋骨不等间距布置对圆柱壳振动特性的影响

Influence of aperiodic frames on vibration characteristics of cylindrical shell

本文研究了肋骨不等间距排列对加肋圆柱壳振动的抑制作用。采用2种肋骨间距,交替排列,构造整个圆柱壳的肋骨不等间距排列形式,2种肋骨间距的确定方法是:保持2种肋骨间距的总和不变,逐步增大两者的间距差,从而增加相邻的肋骨间的2个圆环结构的固有频率差,直至固有频率差趋于不变,最终确定了2种肋骨间距。分别计算并对比分析了肋骨等间距和不等间距布置的圆柱壳的均方振速,结果表明:肋骨不等间距排列可以降低圆柱壳高频振动。

In this paper, the Influence of aperiodic frames on vibration characteristics of cylindrical shell is studied.Two kinds of frame spacing are adopted, and the two kinds of frame spacing alternate to arrange, which constitute the arrangement form of frames of cylindrical shell. Two kinds of frame spacing are determined according to the following method: keep the sum of the two kinds of frame spacing invariant, and then increases gradually the difference of the two kinds of frame spacing, and the natural frequency difference of the adjacent ring shell increases gradually until the difference becomes constant, and the two kinds of frame spacing are determined. For the cylindrical shell with periodic frames and aperiodic frames, comparing the mean square velocity, it can be found that the vibro-acoustic behavior of the aperiodic frames arrangement of ring-stiffened cylindrical shell is better than the traditional ring-stiffened cylindrical shell.