摘要
以周向分布线力作用下,浸没在黏性流场中的无限长弹性薄圆柱壳为研究对象,分析流体黏性对黏性流场-圆柱壳耦合系统的振动能量流输入的影响规律,考虑周向分布线力作用下,薄圆柱壳壳体与由有黏、可压缩流体组成的流场之间的相互作用.首先采用Flügge薄壳理论分析壳体结构振动,然后把线性化的连续性方程、线性处理后的纳维-斯托克斯方程和小振幅波动下的状态方程结合起来得到了黏性流场中的声波波动方程,进而根据声场与圆柱壳外表面的运动协调条件推导得到耦合系统的声振耦合方程,提出了相应的数值计算方法,并与理想流体中的特性作了对比,研究了流体黏性对黏性流场-圆柱壳耦合系统的振动能量流输入的影响规律,为水下结构的减震降噪提供理论依据.
The influence of fluid viscosity on the characteristics of the input power flow in an infinite cylindrical shell immersed in a viscous acoustic medium under the action of circumferential-distributional line force was studied.Firstly,the Flügge′s thin shell theory for an isotropic,elastic and thin cylindrical shell,the wave equations for the viscous flow field and the appropriate wave-harmonic field expansions along with the pertinent boundary conditions were employed to get the vibro-acoustic coupled equation of motion of the coupled system.Subsequently,corresponding numerical methods were applied to solve the equation at various viscosity coefficients and the obtained results were compared to the case in ideal flow field,which illustrated the influence of fluid viscosity on the characteristics of input power flow in the coupled system and can provide theoretical basis for the vibration attenuation and noise reduction of underwater structures.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第2期55-60,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51379083)
高等学校博士学科点专项科研基金资助项目(20120142110051)
关键词
黏性流场
势函数方法
输入能量流
加阻尼数值积分法
十点高斯积分法
fluid viscosity
potential function approach
input power flow
additional-damping numerical integration method
ten-point Gaussian integral method
