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| Acoustic Performance of Sound Absorption Coating Containing Composite Cavities |
| TAO Meng-1, ZHUO Lin-Kai-2 |
| (1. School of Mechanical Engineering, Guizhou University, Guiyang 550025, China； 2. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240，China) |
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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.
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Received: 09 April 2012
Published: 28 March 2013
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