MACROSCOPIC PHYSICAL PARAMETERS OF BIOCOMPOSITES

The topological complexity of most acoustical materials necessitates the charac­terization of these materials based on gross properties.13 The physical parameters which affect the acoustic properties of fibrous structures include flow resistance, thickness, porosity, weight of the structure, tortuosity, surface impedance, compo­sition, the geometrical shape of the material, and the presence of air gap or cover

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