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Cellulose-based porous materials with a three-dimensional network skeleton and sound-absorbing properties prepared by foam forming were successfully made in this study. A refitted empirical model based on the Delany-Bazley model had been developed to predict the sound absorption coefficient of cellulose-based porous materials. The parameters of the model had been adjusted to best fit the values of flow resistance rate and sound absorption coefficient measured by the double-thickness method. The results showed that the average error of the fitted model between 200 and 6300 Hz was only 3.2%, indicating that the new model could predict the basic acoustic properties of cellulose-based porous materials with a measured flow resistance rate.

Predicting Model of Sound Absorbing Properties of Cellulose-based Porous Materials Prepared by Foam Forming