What is it about?
The effectiveness of the porous acoustic materials in sound insulation is mainly based on their intrinsic properties. The porosity is one of the most known parameters which appear in the theories of sound propagation in porous media. It refers to the ratio of the fluid volume occupied by the fluid phase to the total volume. Viscous tortuosity is a parameter that has been used recently in the literature to determine the acoustic absorption of multiperiodic composites; it describes the interaction of the fluid structure in the low frequency. Therefore, it is of some importance to devise experimental methods to estimate these parameters.
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Why is it important?
The practical implementation of the direct methods for measuring the porosity could be complex and expensive. The viscous tortuosity has not been yet measured experimentally. In this paper, a simple acoustical method is proposed for measuring the porosity and the viscous tortuosity using reflected waves by air-saturated porous materials at low frequencies (100–400) Hz
Perspectives
Porous materials such as plastic foams, fibrous materials, granular materials, rocks and ceramics are among the materials commonly used in our daily lives and in building construction to reduce noise and vibration pollution. The effectiveness of porous acoustic materials in sound insulation is mainly based on their intrinsic properties. I hope this method proposed is efficient, fast, and inexpensive to determine these parameters and better predict the acoustic behavior of the materials used in these buildings.
Mustapha Sadouki
Read the Original
This page is a summary of: Experimental measurement of the porosity and the viscous tortuosity of rigid porous material in low frequency, Journal of Low Frequency Noise Vibration and Active Control, February 2018, SAGE Publications,
DOI: 10.1177/1461348418756016.
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