STUDY ABOUT SOUND ABSORPTION INTO CONCRETED-WOOD MATERIALS
This paper presents sound absorption theory and measurements for a cemented wood-fiber material. An acoustical model is presented in order to determine physical properties of the concreted-wood materials. An inverse acoustical characterization is used by best-fitting the model function to the experimental data with the least squares method. The inversion method contains an optimization process and hence it is verified that the optimal unknown parameters, even though derived from a mathematical optimum for a given experimental configuration (sample’s thickness, measured frequency range), are the intrinsic properties of the characterized porous material.Keywords: Acoustical Impedance, Sound Absorption, Mathematical Model
Champoux, Y. ş.a., On acoustical models for sound propagation in rigid frame porous materials and the influence of shape factors, J. Acoust. Soc. Am. Volume 92, Issue 2, pp. 1120-1131, 1992
ISO 10354-2, Acoustics – Determination of sound absorption coefficient and impedance in impedance tubes – Part 2: transfer-function method; 1996
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