Acoustic Performance of Sound Absorption Coating Containing Composite Cavities

Abstract

Abstract: Using the waveguide finite element method, the propagation and the attenuation curves of the axial wave in the sound absorption coating which contains periodic composite cavities were obtained. Besides, 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 as an example, the effect of cavity size on the acoustic performance was discussed both by the wave-mode transformation phenomenon and by the axial wave propagating characteristics respectively. The erical results show that the peak absorption coefficient is shifted to the lower frequency as the proportion of bigger cavities in the composite coating increases.

Key words: composite cavities, sound absorption coating, waveguide finite element, transfer matrix

CLC Number:

TB 56

TAO Meng-1, ZHUO Lin-Kai-2. Acoustic Performance of Sound Absorption Coating Containing Composite Cavities[J]. Journal of Shanghai Jiaotong University, 2013, 47(03): 408-412.

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