螺旋桨激振力传递模式下的艇体振动和声辐射分析

Analysis of vibration and acoustic radiation of submarines under transfer modes of propeller excitation force

潜艇的艇体结构是潜艇螺旋桨激振力向外辐射噪声的重要通道,而轴系是螺旋桨激振力传递到艇体的必经之路,因此有必要研究潜艇轴系向艇体传递的激振力对潜艇艇体振动和辐射声功率的影响。为此,分别针对螺旋桨轴向激振力、螺旋桨侧向激振力和螺旋桨垂向激振力工况,使用模式分析的方法,将轴系对艇体的作用力分解为互不相关的力传递模式的叠加。建立潜艇结构有限元模型,采用结构有限元耦合流体边界元的附加质量附加阻尼算法,分析单阶力传递模式作用于艇体时艇体的振动和声辐射特性。所做的研究可为分析螺旋桨激振力作用下的艇体振动和声辐射提供一种新的方法。

The hull system is an important path for radiating propeller noise. Propeller excitation must be transmitted by the thrust to the hull system. As such,the study of the relations between force transmission and the vibration and sound power of submarines is very important. To this end,this paper aims at propeller excitation force,lateral excitation force and vertical excitation force. The transmission modes of the force loaded by the thrust system are analyzed,and the combined fluid-structure interaction,vibration and sound power of the finite element model of the submarine are analyzed. This provides a new method for analyzing the vibration and radiation of submarines under propeller excitation force.