椭圆柱空腔吸声覆盖层的声学特性  

Acoustic performance of a sound absorption coating containing periodic elliptic cylindrical 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：《振动与冲击》2013年第1期159-163,共5页Journal of Vibration and Shock

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(WFEM)分析了共振腔型吸声覆盖层内轴向波的传播和损耗特性,以椭圆柱空腔吸声层为例,在保持穿孔系数不变的前提下,分别从轴向波传播和波型转换的角度分析了空腔形状改变吸声覆盖层声学特性的机理。在此基础上,结合波导有限元方法和传递矩阵(TM)建立了变截面空腔吸声覆盖层的分析模型,以圆台空腔吸声层为例,与二维解析方法对比验证了WFEM-TM方法的正确性,并讨论了椭圆台空腔吸声层的声学特性。Using the waveguide finite element method, the propagation and attenuation of axial wave in a sound absorption coating containing periodic resonant cavities were analyzed. For the case of elliptic cylindrical cavities, assuming the same perforation ratio, the effect of cavity geometry on the acoustic performance of the sound absorption coating was analyzed from views of both the axial wave propagating characteristic and the wave-mode transformation, respectively. The waveguide finite element method （WFEM） and the transfer matrix （TM） were combined to establish an analysis model for the acoustic performance of a sound absorption coating containing periodic deforming cavities. The WFEM-TM method was validated by comparing it with a two-dimensional analytic method for the case of periodic conical cavities. Furthermore, the acoustic performance of a coating containing periodic elliptic conical cavities was discussed.

关 键 词：波导有限元 吸声覆盖层 空腔形状 波型转换 传递矩阵 

分 类 号：TB56[交通运输工程—水声工程]