22-26 ABSORBŢIA SONORĂ A MATERIALELOR DIN AŞCHII DE LEMN CIMENTATE
This paper presents sound absorption measurements for a cemented
wood-fibber material. An acoustical model is presented in order to determine
physical properties like porosity, airflow resistivity and tortuosity. 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.
Cuvinte cheie: impedanţa acustică, absorbţie sonoră, model
matematic
Keywords: acoustic impedance, sound absorption mathematical model