Abstract
The paper analyzes the possibility of determining the acoustic absorption coefficient by means of mathematical models from the literature for new composite porous materials. The materials studied were made of fir sawdust and flexible polyurethane foam with open pores. The acoustic absorption coefficient of the materials was determined experimentally by means of the impedance tube. The experimental results were compared with those obtained by modeling with the Maple 16 software, by inserting the material characteristics into the mathematical equations. The models used in this study were Delanz-Bayley adapted for foams, Allard-Champoux and Hamet-Berengeir. The results of this study show that the analyzed models are not suitable for new composite porous materials and that new models should be developed to correctly describe their acoustic absorption properties.
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