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US 7,308,965 B2Granted
Noise abatement wall
AssigneesEcole Polytechnique, Colas
InventorsBernard Sapoval, Marcel Filoche, Michel Chappat, Didier Peyrard
Life of this patent
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Abstract
A noise-absorbing device includes a substantially flat base and embossed and/or hollow elements each including at least one recess. This base reveals with the embossed and/or hollow elements, a configuration exhibiting a fractality zone of between 1 cm and 50 cm, of fractal dimension greater than 2.5 enabling the localization of the waves over the sound frequency range, in the vicinity of the elements.
Claims22
A sound-absorbing device, notably for roads and railways including:
- a substantially flat base with two opposing sides, and
- embossed elements on an upper side of the base, each embossed element including at least one recess, said embossed elements being made of a phonically absorbing material,
- wherein the recess does not communicate with the side of the base opposite to the upper side and said base forms with the embossed elements a configuration exhibiting a fractality over a length range comprised between 1 cm and 50 cm, with a fractal dimension greater than 2.5 enabling the localisation of acoustic modes, in the vicinity of said embossed elements.
A sound-absorbing device, comprising:
- a substantially flat base with two opposing sides;
- and
- a plurality of discrete embossed elements on an upper side of the base, each embossed element including at least one recess,
- wherein the recess does not communicate with a side of the base opposite to the upper side and said base forms with the embossed elements a configuration exhibiting a fractality over a length range comprised between 1 cm and 50 cm, with a fractal dimension greater than 2.5 enabling the localisation of acoustic modes, in the vicinity of said embossed elements.
1 more element
Dependencies are inferred from the claim text.