组合腔型吸声覆盖层的声学特性分析  

Acoustic Performance of Sound Absorption Coating Containing Composite Cavities

作　　者：陶猛[1] 卓琳凯[2] 

机构地区：[1]贵州大学机械工程学院,贵阳550025 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《上海交通大学学报》2013年第3期408-412,共5页Journal of Shanghai Jiaotong University

基　　金：上海交通大学海洋工程国家重点实验室开放基金(1113);贵州省科学技术基金(黔科合J字[2012]2113);贵州大学引进人才科研项目(贵大人基合字[2012]12)

摘　　要：采用波导有限元方法分析了组合腔型吸声覆盖层单元的轴向波传播和损耗特性,并结合传递矩阵建立了该结构覆盖层声学特性的分析模型.以组合型圆台空腔吸声覆盖层为例,分别从波型转换和轴向波传播特性的角度分析了不同大小的空腔嵌入改变吸声覆盖层声学特性的规律.结果表明,随着大腔嵌入比例的增加,吸声系数的峰值频率逐渐向低频偏移,改善了低频吸声性能.Using the waveguide finite element method, the propagation and the attenuation curves of th~ axial wave in the sound absorption coating which contains periodic composite cavities were obtained. Be sides, the analytical approach of the acoustic performance of sound absorption coating was given together using the transfer matrix. Taking the sound absorption coating which contains periodic conical cavities a, an example, the effect of cavity size on the acoustic performance was discussed both by the wave-modetransformation phenomenon and by the axial wave propagating characteristics respectively. The numerica results show that the peak absorption coefficient is shifted to the lower frequency as the proportion of big ger cavities in the composite coating increases.

关 键 词：组合腔型 吸声覆盖层 波导有限元 传递矩阵 

分 类 号：TB56[交通运输工程—水声工程]