A note on the prediction method of reverberation absorption coefficient of double layer micro-perforated membrane |
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Authors: | Jian Zou Jianbin Yang Xiaojun Qiu |
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Institution: | State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China |
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Abstract: | The absorption performance of micro-perforated absorber (MPA) has been usually estimated by equivalent circuit (EC), however, it has been noted that the predicted absorption coefficient by EC does not agree completely with the experiment in some frequency range. Hence impedance transfer method (ITM) is adopted to predict the reverberation absorption coefficient of a double layer micro-perforated membrane (MPM) structure. Experimental studies show that the prediction of ITM is better than that of EC. |
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Keywords: | Micro-perforated membrane Absorption coefficient Method of reverberation Impedance transfer method |
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