Abstract
The acoustic behaviour of fibrous materials with a flexible frame has been investigated experimentally. Characteristic impedance and propagation constants have been measured for super-thin fibreglass having different fibre diameters and density. From comparative analysis of experimental results the empirical relations between the acoustic parameters and physical values characterizing an internal medium macrostructure have been derived. This model can be used to predict values of the acoustic impedance and the sound absorption coefficient of material layers, provided the fibre diameter and density are known. It has been shown that for materials with thicker fibres this improved model tends to the approximate one derived in a previous paper.
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