Abstract
The empirical model derived in the previous paper (Voronina NN. An empirical model for elastic porous materials. Applied Acoustics 1998;55(1):67–83) has been compared with the Biot theory using calculated and experimental results obtained by Allard et al., (Allard JF, Akine A, Depolier C. Acoustical properties of reticulated foams with high and medium flow resistance. Journal Acoust Soc Am 1986;79(6):1734–40) for a for polycarbodiimide sample having known values of porosity, shear modulus; flow resistivity; pore diameter and tortuosity. From the comparison it has been observed that at frequencies lower than 1000 Hz there are discrepancies between the predictions of theoretical and empirical formulas. For the frequency range between 2000 and 4000 Hz the empirical predictions agree rather satisfactorily with those of the Biot theory.
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