Absorbent material, consisting of a porous substance with double porosity
AssigneeCentre National de la Recherche Scientifique (CNRS)
InventorsClaude Boutin, Xavier Olny
Life of this patent
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Abstract
The invention concerns an absorbent material (1), consisting of a porous matter with open porosity (2), characterised in that it comprises a plurality of perforations (3) with varied transverse cross-section end positioned at an angle θ relative to a specific dimension of the material, thereby providing additional porosity (Pa) to the material (1).
Claims5
Acoustic absorbent material (1), consisting of porous substance with open porosity (2), having a plurality of perforations (3) positioned at an angle σ relative to a dimension consisting of the thickness of the material, thus imparting an additional porosity (Pa) to the material (1), characterized in that the, additional porosity (Pa) is in the range from 10 to 30% and in that it has an acoustic absorption coefficient that ranges from approx. 0.7 to 0.95 for low frequencies, of the order of 300 Hz.
Dependencies are inferred from the claim text.