空腔深度序列变化及腔内膜板拓展并联微穿孔低频吸声

项目名称： 空腔深度序列变化及腔内膜板拓展并联微穿孔低频吸声

项目编号： No.11204219

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 俞悟周

作者单位： 同济大学

项目金额： 30万元

中文摘要： 针对微穿孔结构的低频吸声性能拓展问题，提出利用并联单元的阻抗耦合及腔内设置共振结构提高低频吸声。项目根据媒质间声传播理论、声散射理论和有限元法，建立腔内设置膜/板结构及空腔深度在一维/两维方向按不同序列变化的微穿孔板并联复合结构的吸声理论和计算模型。采用经试验研究校验的理论模型，从空腔的布置方式、空腔深度在一维/两维方向上的序列变化、空腔内膜板共振结构的分布和参量变化等方面对低频吸声性能的影响进行深入的理论和试验研究。研究结果将揭示不同声学条件对微穿孔板并联复合结构低频吸声性能的影响特性和内在规律，分析确定重要的影响参量，形成微穿孔并联复合结构的优化设计方法。研究涉及低频吸声的基础科学问题，成果对完善微穿孔复合结构的吸声理论、拓展微穿孔结构在低频的应用有重要科学意义，对解决目前低频吸声的难点问题有重要的应用价值。

中文关键词： 微穿孔；阻抗变化；吸声；低频；声散射

英文摘要： In order to improve the acoustic absorption performance of micro-perforated panel structure at low frequency, the viewpoint is presented applying impedance coupling between parallel array of micro-perforated units as well as interior reaonator in cavity. Sound propagation theory in medias, sound scatter theory and finite element method are adopted jointly in the research to establish theoretical calculation model of compound structure of micro-perforated structures with interior membrane/panel resonant structure and with different cavity depths varying in sequences in one/two dimension. By theoretical models verified by measurement results, the effect of array mode of cavities, depth changing sequence of cavities, distribution and parameters of membrane/panel resonant structure to the sound absorption performance at low frequency are studied. Characteristics and rules of sound absorption performance of compounded micro-perforated panels at various conditions are to be investigated. Parameters with potential influence are to be identified and optimization design method of the compounded structure is to be presented. Fundamental scientific problems of acoustic absorption at low frequency are referred in the research. Study results of the research will supplement the acoustic theory of micro-perforated structures a

英文关键词： micro-perforated panel；impedance change；sound absorption；low frequency；sound scattering