Research on the calculation method of sound absorption coefficient for non-uniform acoustic coat
In this paper,a way of calculating the absorption coefficient of acoustic coat with periodic element is studied,and a combined numerical and analytical method is proposed to improve the efficiency of analysis.Firstly,based on the test-ing principle of acoustic impedance tube three-hydrophone with double load method,the finite element model of acoustic tube was established and the equivalent transfer matrix was obtained,and the sound absorption coefficient of was calculated based on the analytical theory of multi-layer uniform medium.In order to verify the accuracy,the results of direct finite ele-ment calculation and numerical combined analytical calculation are compared.The results show that the proposed algorithm can accurately predict the sound absorption coefficient in most frequency ranges.The causes of calculation errors are also analyzed in detail.This method provides theoretical support and method guidance for optimizing the noise reduction per-formance of acoustic coat effectively.
acoustic coatsound absorption coefficientnumerical combined with analyticalcalculation errors
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