含弹性连接和夹层流体的双层壳振动传递特性研究  

A study on vibration transmission characteristics of double-layer shell with elastic connection and interlayer water

作　　者：于安斌 赵应龙[2,3] 侯九霄[2,3] YU Anbin;ZHAO Yinglong;HOU Jiuxiao(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China;Institute of Noise&Vibration,Naval University of Engineering,Wuhan 430033,China;National Key Laboratory on Ship Vibration and Noise,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学动力工程学院,武汉430033 [2]海军工程大学振动与噪声研究所,武汉430033 [3]海军工程大学船舶振动噪声重点实验室,武汉430033

出　　处：《振动与冲击》2023年第8期167-176,205,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金(52077218,51779098);基础加强计划重点基础研究项目(2020-JCJQ-ZD-222)。

摘　　要：为研究水中隔振器的振动传递机理,结合子结构导纳法、波传播法和四端参数法,建立了含弹性连接和夹层水的双层圆柱壳振动耦合理论模型。模型分为内、外壳两个子结构以及弹性连接构成的修正子结构,采用结构刚度和连接刚度构成的矩阵描述夹层流体的影响,推导内壳以内的水介质声压,对水中隔振器的振动传递特性开展了研究。结果表明:对存在夹层水介质的条件下,内壳以内的水介质流体负载效应同时作用于内外壳;内外壳夹层水对壳间的振动传递起到了“短路”作用,降低了隔振器的减振性能,且与夹层厚度无关;此外,与刚性支撑连接相比,水中隔振器仍具备一定的隔振效果。In order to study the vibration transmission mechanism of an underwater vibration isolator,the vibration coupling theoretical model of a double-layer cylindrical shell with elastic connection and interlayer water was established by combining a substructure admittance method,a wave propagation method and a four-end parameter method.The model was divided into two substructures:inner and outer shells and the modified substructure composed of elastic connection.The influence of sandwich fluid was described by the matrix composed of structural stiffness and connection stiffness,the sound pressure of water medium in the inner shell was deduced,and the vibration transmission characteristics of underwater vibration isolator were studied.Results show that under the condition of interlayer water medium,the fluid loading effect of water medium in the inner shell acts on the inner shell and outter shell at the same time.The interlayer water between the inner and outer shells plays a“short circuit”role in the vibration transmission between the shells,which reduces the vibration damping performance of the vibration isolator,while has nothing to do with the interlayer thickness.In addition,compared with the rigid support connection,the underwater vibration isolator still has a certain vibration isolation effect.

关 键 词：弹性连接 夹层流体 双层圆柱壳 振动传递 

分 类 号：U661[交通运输工程—船舶及航道工程]