Abstract
A wide range of commercial applications (building acoustics, food industry, automotive industry) can be found for porous materials. Accurate material characterization and modeling is vital for the use of these materials in multilayered systems due to increasing demands in acoustic comfort, noise legislation, and quality control during production. There is, however, a distressing lack in raw, accurate material data and measurement methods concerning the characterization of these materials. Measuring and modeling methods for the characterization of these materials will be presented. The experimental technique for the determination of the elastic properties is based upon the excitation of waveguides in porous materials. The other parameters of the Biot-Allard model are predicted using ultrasound. Acoustical properties can be predicted by using the measured structural material properties and incorporating them into a transfer-matrix-based multilayered model.
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