肋骨非均匀排列的圆柱壳振动特性研究

Influence of Aperiodic Frames on Vibration Characteristics of Cylindrical Shell

以安德森定域效应的原理为基础,肋骨间距为随机分布,分析了肋骨非均匀排列时圆柱壳的振动特性;采用两种肋骨间距,交替排列,构造整个圆柱壳的肋骨不等间距排列形式;保持两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两个圆环结构的固有频率差,直至固有频率差趋于不变,最终确定了两种肋骨间距。分别计算并对比分析了肋骨等间距和不等间距排列的圆柱壳的均方振速,结果表明,肋骨不等间距排列具有一定的减振效果。

Firstly,based on the Anderson localization phenomenon,frame spacing was random distribution,and the vibration characteristics of cylindrical shell was analyzed,and then two kinds of frame spacing were adopted,and the two kinds of frame spacing alternate to arrange,which constitute the arrangement form of frames of cylindrical shell.To keep the sum of the two kinds of frame spacing invariant,and then to increase 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.