摘要
本文采用有限元/边界元(FEM/BEM)方法对船舶水下辐射噪声特性进行研究。首先应用五种类型的有限单元建立了接近于真实船舶结构的有限元模型(包括机舱动力设备),并应用有限元法完成了流—固耦合状态下,船舶结构振动位移响应数值计算。然后将有限元模型的外表面处理成边界元模型,并由船舶外表面位移响应计算得到用于水下辐射噪声计算的速度边界条件。最后利用边界元技术对船舶水下辐射噪声特性进行研究。本文预估了仅考虑推进柴油机激励、柴油发电机组激励、齿轮箱激励以及所有激励情况下的船舶水下辐射噪声,并将其数值计算与实际测量结果比较,比较结果符合良好。
The finite element (FEM) and the boundary element method (BEM) were combined together to solve the underwater radiation noise of ships. First, a finite element model of entire ship including power plant in engine room was built by using 30 geometric parameters and five kinds of finite elements, such as SHELL63, BEAM4, SOLID95, COMBIN14 and MASS21. Finite element method was employed to analyze the vibration responses of ship to excitations in consideration of fluid-structure interaction. Then, the outer surface of finite element model was treated as the boundary element model and the vibration displacement responses of the ship surface were treated as the velocity boundary condition for calculation underwater radiation noise. Boundary element method was employed to calculate the underwater radiation noise. The underwater radiation noise of ship considering only propulsion diesel engine, auxiliary diesel energy or gearbox excitations have been predicted respectively. And, total sound pressure levels of ship underwater radiation noise due to all excitations have been calculated during design phase and show a good agreement with experimentally measured results.
出处
《船舶力学》
EI
2004年第1期113-124,共12页
Journal of Ship Mechanics
关键词
船舶
水下辐射噪声
有限元模型
位移响应
齿轮箱
边界元法
结构振动
Acoustic noise
Boundary element method
Finite element method
Fluid structure interaction
Ships
Vibrations (mechanical)
