水下有限长双层圆柱壳舷间声功率传递特性分析  

On power transmission behavior of finite length double-layer cylindrical shells

作　　者：白振国[1,2] 张峰[1,2] 丁灿龙 

机构地区：[1]船舶振动噪声重点实验室,江苏无锡214082 [2]中国船舶科学研究中心,江苏无锡214082

出　　处：《船舶力学》2014年第10期1262-1274,共13页Journal of Ship Mechanics

摘　　要：采用模态展开法建立了水下有限长双层加筋圆柱壳的振动声辐射模型,给出了环肋、实肋板和舷间水的阻抗表达式,分析了实肋板的周向、轴向、径向及弯矩作用力对双层圆柱壳结构振动声辐射的影响,比较了舷间水与实肋板的传递功率,并针对实肋板详细分析了不同作用力的功率传递特征及主要作用频段。结果表明:0.5倍环频以下,双层壳体间功率传递以舷间水为主,0.5倍环频以上,实肋板对声辐射峰值的贡献更为明显;实肋板功率传递的四个分量中,环频以下以切向力和径向力传递为主,环频以上四个分量传递功率量级基本相当,轴向力略低。An analytical model describing the under-water vibration and sound radiation of stiffened finite cylindrical double shell is established by means of modal expansion method. The impedance of ring stiffen-ers, connected annular plates and medial water between inner and outside circumferential cylindrical shell is considered. The influence of circumferential force, axial force, radical force and axial bending moment of connected annular plates on vibration and sound radiation is studied, and the sound power transferring by connected plate and medial water is also compared, furthermore, the transmitted power from inner shell to outside shell by circumferential force, axial force, radical force and axial bending moment of connected plate is analyzed in detail. The results show that the transmitted sound power is dominated by medial water be-tween shells below the half ring frequency, while above the half ring frequency, the resonant peak of sound power is attributed to annular plates. Among the 4 types of forces and moment, the radial and circumferen-tial force transmit the main part of the power below the ring frequency, while the 4 types of force just share the power above the ring frequency except for the axial force.

关 键 词：双层圆柱壳 实肋板 传递功率 舷间水 

分 类 号：TB53[理学—物理]