Abstract
A composite foam consisting of open-cell metallic foam embedded with polyurethane foam is fabricated and evaluated for sound absorbing properties. The best performing composite foam increased the sound absorption by a factor of 6 (from .1 to .6) in the low frequency test range and by a factor of 2 (from .2 to .4) broadband compared to the original metallic foam. A lumped element model is used to predict and elucidate the absorption mechanisms for the composite, as well as for pure metallic foam and pure polyurethane foam. The model gives insight into the physical mechanisms that control acoustic absorption, including thermo-viscous effects at pore interfaces, structural damping effects due to foam elasticity, and coupling effects due to the interaction of air, metal, and polyurethane in the composite. Additionally, a simplified two parameter model was used to elucidate acoustic absorption trends for composite foams. The developed composite foams are advantageous for engineering and architectural applications where combined high stiffness and sound absorption are required.
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