考虑重流体耦合效应的双层板-腔结构振动与声辐射分析  

Vibration and Sound Radiation Analysis of a Double Panel-Cavity Structures Considering Heavy Fluid Coupling Effect

作　　者：李清盛 李天匀[1,2,3] 朱翔 张帅[1] 聂睿[1] LI Qingsheng;LI Tianyun;ZHU Xiang;ZHANG Shuai;NIE Rui(School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai Jiaotong University,Shanghai 200240,China;Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学船舶与海洋工程学院,武汉430074 [2]上海交通大学高新船舶与深海开发装备协同创新中心,上海200240 [3]华中科技大学船舶与海洋水动力湖北省重点实验室,武汉430074

出　　处：《噪声与振动控制》2023年第5期1-7,101,共8页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51839005,51879113)。

摘　　要：考虑半空间声场内重流体的声振耦合效应,对有限大双层板-腔结构的振动与声辐射特性进行研究。采用改进傅里叶级数描述薄板位移和腔内声压,通过Rayleigh积分建立辐射板表面辐射声压和辐射板位移的关系,基于Hamilton原理,提出采用Rayleigh-Ritz法分析耦合系统声振特性的半解析方法,并通过和有限元结果对比验证方法的收敛性和准确性。分析单位简谐力激励下,声腔厚度和腔内流体介质对双层板-腔结构声辐射特性的影响。结果表明:重流体的耦合效应使薄板(奇,奇)模态振型显著变化,声腔较薄时声辐射对声腔厚度变化较敏感。相较于腔内流体声速,腔内流体密度对声辐射有较大影响。Vibro-acoustic behavior of a double panel-cavity structure is analyzed considering the vibro-acoustic coupling effect of heavy fluid in semi-space.The panel displacement function and the cavity sound pressure function are expresses by means of the modified Fourier series.The relation between the radiation sound pressure on the surface of the radiation panel and the displacement of the radiation panel is established by Rayleigh integral.Based on Hamilton principle,a semi-analytical approach for analyzing the vibro-acoustic characteristics of the coupled system is established by Rayleigh-Ritz method.And the convergence and accuracy of this method are verified by comparing its result with the finite element results.Under the excitation of unit simple harmonic force,the effects of cavity thickness and fluid medium on the acoustic radiation characteristics of the underwater doubl layer panel-cavity model are analyzed.The results show that the coupling effect of heavy fluid makes the modal shape of the panel change significantly,and the thickness change has a great influence on the sound radiation for the thin sound cavity.The fluid density in the cavity has a greater influence on the sound radiation than the sound velocity of the fluid.

关 键 词：振动与波 双层板 板-腔结构 声振耦合 声辐射 傅里叶里兹法 

分 类 号：TB532[理学—物理]