具有浮筏的有限圆柱壳体的尺度对其振动和声辐射的影响  

Influence of dimension of a finite cylindrical shell with a floating raft on its vibration and acoustic radiation

作　　者：殷学文[1] 丁旭杰[1] 华宏星[1] 沈荣瀛[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《振动与冲击》2009年第4期47-50,共4页Journal of Vibration and Shock

摘　　要：研究了安装浮筏系统的有限圆柱壳体的振动和声辐射特性,建立由机器-浮筏-艇体组成的一个复杂动力系统的有限元/边界元模型,并采用该模型对三种方案,即一个舱段、三个舱段、全艇进行水下噪声级预报;讨论了三种不同方案对壳体表面振速和水下辐射噪声级的影响规律,结果表明在潜艇舱段首阶弯曲振动的共振频率以下,用一个舱段模拟整艇的动态特性是不合适的;在高于此频率,采用舱段模型来预报整艇的表面振速是可以接受的。Vibration and acoustic radiation characteristics of a finite cylindrical shell with a floating raft were investigated. A FEM/BEM model was established for the complex dynamic system composed of machineries, floating raft, and the shell (a submarine body). Using this model, three projects, i.e., one cabin, three cabins, and the whole submarine, were considered for prediction of underwater sound level. Discussions were presented for influences of three different projects on the shell’s surface vibration velocity and the far-field acoustic radiation. The results indicated that below the resonance frequency for the first bending mode of the submarine cabin, it’s improper to simulate the dynamic characteristics of a whole submarine with one cabin model, but up this frequency, it’s acceptable to predict the shell surface velocity of a whole submarine using a cabin model.

关 键 词：结构振动 声辐射 浮筏 有限元 边界元 

分 类 号：O326[理学—一般力学与力学基础] O422.6[理学—力学]