Simulation of Acoustic Properties and Parameter Optimization of Glass Fiber-polyurethane foam Multilayer Composites based on Transfer Matrix Method

In this study, a simulation model of the acoustic properties of multilayer composites based on the transfer matrix theory was established to meet the requirements of the performance of multilayer composites, and the influence of material parameters on the acoustic wave propagation characteristics was systematically explored. By decomposing the composite materials into a fluid layer, a solid layer, a porous material layer and viscoelastic layer, combined with the continuity conditions and boundary constraints of each layer medium, a layered acoustic transfer matrix model is constructed, and the quantitative prediction of reflection coefficient, impedance coefficient and sound absorption coefficient is realized. Taking glass fiber (5.5 kg/m²) and polyurethane foam (22 kg/m²) as the research objects, the effects of curvature, viscous characteristic length, and thermal characteristic length on acoustic performance were analyzed by numerical simulation. This study provides a theoretical basis for the structural optimization and broadband sound absorption design of multilayer composites, and has important guiding significance for improving the performance and application of multilayer composites.