纵桁对环肋圆柱壳体水下振动与声辐射的影响

采用结构有限元耦合流体边界元的附加质量附加阻尼算法,对具有不同数量纵桁的加筋环肋圆柱壳水下振动与声辐射噪声进行了数值计算,并对数值计算结果进行了初步的比较和分析,讨论了纵桁的数量对圆柱壳水下振动与声辐射的影响.结果表明:纵桁对圆柱壳水下的减振降噪有较好的效果,并且纵桁的数量越多,减振降噪效果越好,但增加纵桁的数量也相应增加了艇体的重量,在潜艇结构设计时须在降噪及艇体重量间综合权衡.

Effect of longitudinal beams on acoustic radiation of cylindrical shell

An approach to combining finite element with boundary element method was adopted to calculate the underwater vibration and acoustic radiation from a ring stiffened cylindrical shell with longitudinal beams different in number.The effect of the longitudinal beams on the cylindrical shell was analyzed by comparing the numerical results.The results show that longitudinal beams can reduce the cylindrical shell′s vibration and acoustic radiation.The more longitudinal beams are used,the more vibration and acoustic radiation are reduced.This provides references for designing acoustic configuration of a submarine.But its weight also increases with more longitudinal beams added to cylindrical shell,which should be considered in designing a submarine′s configuration.