Calculation of sound absorption characteristics of porous sintered fiber metal

Focusing its attention on porous sintered fiber metal, this paper presents a simple extended acoustical model on the basis of Biot-Allard model by using the idea of convective heat transfer in metallic tube for reference in order to calculate the sound absorption characteristics of porous sintered fiber metal. The sound absorption coefficients and the specific surface acoustic impedances of one-layer porous fiber metal sheets, two-layer-assembled and three-layer-assembled porous fiber metal sheets are calculated by using the extended and Biot-Allard model and then compared with the corresponding measured values. By comparing, it is shown that the theoretical results calculated by using the extended model fit the measured ones better. Finally, those above-mentioned results are further discussed and analyzed. (C) 2008 Elsevier Ltd. All rights reserved.