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Optimization of Acoustic Performance of Highly Porous Polyurethane Foam Using Micro-Structural Based Model

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Polyurethane (PU) foams are widely used in vehicles as vibro-acoustic energy dissipative materials. Propagation of acoustic waves in such a homogenous poroelastic layer can be described by the Biot's model that consists of 9-parameters representing foam properties. These macroscopic parameters, known as the Biot-Allard's parameters, are inherently dependent on the internal microstructure properties of the foam. Recently, simple relations that correlate the microstructure properties of highly porous polyurethane foams to their macroscopic properties have been developed by Doutres et al. [Doutres 2011, 2013] and Gholami et al.[Gholami 2017]. In this paper, these micro-structures based models are used to explore the porous polyurethane foam with enhanced vibro-acoustical performance. The macroscopic properties of the dissipative layer are assumed to be either homogenous or non-homogenous, functionally graded along the thickness.

Document Type: Research Article

Publication date: November 10, 2017

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