Abstract
Since environmental protection is of increasing importance, the sound absorption of polyurethane foams in which the normal petroleum content is partly replaced by soybean oil has been studied through simulations and experiments. In this study, the theoretical sound absorption coefficients of the foam with different microstructures were calculated by using Johnson-Champoux-Allard (JCA) method. The parameters required in the JCA method were calculated based on the specific finite element analysis of periodic unit cells (PUCs) under ideal conditions. The PUCs were modeled as tetrakaidecahedrons with different numbers of pores in the wall cells. Both the experimental results and simulation results show that the sound absorption performance of PU foam is influenced by pore numbers, and the more pores the better sound absorption performance. Simulations show that the number of pores influences the JCA parameters including air-flow resistivity, tortuosity and characteristic lengths.
Published Version
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