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Proceedings of the 2015 International Conference on Test, Measurement and Computational Methods
In the reverberation room, the absorption coefficient is measured by the composite structure of perforated plate, perforated plate and porous sound absorbing material, and the sound absorption characteristics of perforated plate are studied. Through the analysis of the data ,it is founded that: under different thickness of the cavity D, the peak value of sound absorption coefficient of perforated plate is maintained is about 0.35; the resonance frequencies of the perforated plate decreasesdoi:10.2991/tmcm-15.2015.18 fatcat:rmoxkf3pcfhdnixp62idlrtjei