基于振动传递分析的舰船辐射噪声特性研究

摘要

基于结构振动传递分析,采用有限元/边界元法,结合统计能量分析,探讨了舰船的辐射噪声特性以及噪声预报方法.通过建立某舰船的振动噪声分析模型,研究了船体在主机激励下的振动响应及其沿船体表面的分布规律.在此基础上,分析了各舱段的辐射声功率对舰船辐射噪声的贡献,并且对主机激励下的全船辐射噪声特性进行了研究及预报.研究工作以及所得的结果对于舰船的声学设计具有参考意义.%Combining the finite element method (FEM), the boundary element method (BEM) and the statistical energy analysis (SEA), a new method is put forward to predict the underwater noise based on the investigation of transmission characteristics. By establishing a noise prediction model, the vibration velocity distribution on the outer surface along the ship structure is revealed and analyzed. Then the underwater noises radiated from the whole ship and three separate sections are compared. Moreover, the radiated sound power of the outer surface caused by the main engine is calculated and predicted. A series of valuable conclusions in engineering are derived.