船用螺旋桨叶片振动辐射噪声数值分析

Numerical analysis for noise induced by vibration of propeller blades

螺旋桨噪声是舰船水下噪声的重要组成部分,它会影响舰船的隐身性能。螺旋桨水下噪声可分为流体动力噪声和叶片振动辐射噪声。本文计算研究了螺旋桨叶片振动辐射噪声,首先采用CFD方法对螺旋桨敞水特征进行模拟,提取螺旋桨表面的压力波动作为外部载荷;再利用有限元方法对螺旋桨进行振动响应分析;最后以振动响应作为声辐射边界条件,利用边界元方法计算了螺旋桨的振动辐射噪声。

The noise of a propeller is an important part of ship underwater noise,it affects the stealth performance of ships.The noise of a propeller can be divided into two kinds due to their different forming causes.One is fluid-dynamic noise,and the other is the noise induced by vibration of propeller blades.To calculate the noise induced by vibration of propeller blades,firstly the numerical simulation of propeller open-water performance was conducted by means of CFD,then the vibration response analysis of the propeller was performed with FE method,the hydrodynamic load exerted on the surface of the propeller was taken as the excitation.Finally,the response outputs from FEA were used as the boundary condition of acoustic radiation,the acoustic radiations from propeller blades were calcuated with BE method.