双层壳体船舶动力舱结构声学设计优化  

Structure-borne sound optimization design of ship power cabin with double cylindrical shell

作　　者：夏齐强[1] 楼伟锋[1] 

机构地区：[1]海军装备研究院,上海200235

出　　处：《中国舰船研究》2015年第3期77-83,共7页Chinese Journal of Ship Research

基　　金：国家部委基金资助项目

摘　　要：针对降低双层壳船舶动力舱辐射噪声的需求,对动力舱进行结构声学设计优化。基于结构阻抗增强原理,通过升高肋骨腹板和增加质量抗来增大双层壳结构低阶机械阻抗,并根据壳体优势模态对肋骨尺寸进行优化;为衰减振动波在壳间的传递,引入复合阻波技术,采用阻振质量与粘弹性材料相结合的方法对壳间肋板进行设计;利用FEM/BEM法对动力舱设计前、后振动声辐射性能进行数值计算分析,并开展双层壳模型振动试验。结果表明:应用非均匀阻抗增强环肋和复合阻波技术能有效降低双层壳体船舶动力舱的振动水平和辐射噪声;设计的动力舱具有良好的减振降噪效果,振动水平明显降低,辐射噪声有效减小,是一个性能较好的弱辐射体。In order to decrease sound radiation of power cabin,power cabin with double cylindrical shellwas optimization designed. Based on principle of impedance enhancement,low order impedance of doublecylindrical shell was improved by raising rib height and adding blocking mass. The rib dimension was opti-mized by the dominant mode. As to reduce vibration transmission from rib-plate between double shells,composite wave attenuation technique was introduced into design on rib plate by the way of blocking massand elastic interlayer. The characteristics of vibration and sound radiation from the power cabin were nu-merical analyzed by FEM/BEM. and model testing was done to verify the validity of structure-borne sounddesign. The results show that Applying impedance enhancement and composite wave attenuation techniquecould reduced the vibration response and radiation noise of power cabin effectively. The designed powercabin has better vibration damping and noise reduction performance,vibration response and radiationnoise reduced observably. It was a better weak radiator.

关 键 词：动力舱 双层圆柱壳 减振降噪 结构声学设计 弱辐射 

分 类 号：U661.44[交通运输工程—船舶及航道工程]