The effect of pore numbers in the cell walls of soybean oil polyurethane foam on sound absorption performance. (1st January 2020)

• Record Type: Journal Article
• Authors: Ji, Yangjie; Chen, Shuming; Zhu, Wenbo
• Is Part Of: Applied acoustics. Volume 157(2020)
• Publication Date: 2020-01-01
• Subjects: Polyurethane foam -- Sound absorption performance -- Pore numbers -- Johnson-Champoux-Allard -- Periodic unit cells; Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2019.107010
• Languages: English
• ISSNs: 0003-682X

Abstract

Graphical abstract: Highlights: The effects of pore numbers on sound absorption performance are studied by the experiments and simulations. The propagation and dissipation characteristics of sound waves in the foam are analyzed. The effect of pore numbers on the sound absorption performance of different frequency region is discussed. 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.