单/双层水下结构振动声辐射研究

Research on the vibration and acoustic radiation of single and double layers underwater structure

为研究单壳体和双壳体两种典型潜艇结构的振动声辐射特性,本文建立单/双层桨-轴-壳体简化模型,利用三维水弹性力学理论和三维水弹性声学分析软件,分别计算螺旋桨激励、外部流体激励以及机械激励3种激励源下水下结构的辐射声功率声源级曲线。结果表明:螺旋桨激励下,单层水下结构声辐射略低于双层结构;外部流体和内部机械设备激励下,单层水下结构声辐射明显高于双层结构。

To research the vibration and acoustic radiation characteristics of the single-layer and double-layer underwater structure which are the typical structures of the submarine, the single-layer and double-layer propeller-shaft-hull coupled structures are established, the three-dimensional sono-elastical theory and acoustic analysis software are applied to analyze the sound source level curve of the coupled structure under three different exciting such as propeller exciting, external fluid exciting and internal mechanical exciting. The analysis results show that the total radiated acoustic power of single-layer underwater structure is less than double-layer under propeller exciting, but higher than double-layer under external fluid exciting and internal mechanical exciting.