Acoustic attenuation panel and its manufacturing methods
AssigneeSafran Nacelles
InventorsPierre Caruel, Bertrand Desjoyeaux, Bertrand Leroyer, Marc Versaevel, Laurent Georges Valleroy
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Abstract
An acoustic attenuation panel includes a cellular structure including a plurality of acoustic cells separated from one another by peripheral partitions, a perforated acoustic structure, the perforated acoustic structure and the cellular structure being formed in one piece in a first material, and a porous acoustic layer formed of a second material and fastened to a surface of the perforated acoustic structure by entangling the first material and the second material.
Claims18
A method for manufacturing an acoustic attenuation panel by a molding tool comprising at least one mold and a counter-mold, the acoustic attenuation panel including a cellular structure comprising a plurality of acoustic cells separated from each other by peripheral partitions, a perforated acoustic structure, the perforated acoustic structure and the cellular structure being formed in a single part in a first material, and a porous acoustic layer formed of a second material, fixed to a surface of the perforated acoustic structure by entanglement of the first material and the second material, the method comprising:
- placing a porous acoustic layer in a space located between said at least one mold and the counter-mold;
- pinching the porous acoustic layer between said at least one mold and the counter-mold;
- injecting a material intended to form a perforated acoustic structure and a cellular structure in one piece in a molding tool;
- entangling the material intended to form a perforated acoustic structure and a cellular structure with the material of the porous acoustic layer;
- and
- removing the acoustic attenuation panel formed from the molding tool.
Dependencies are inferred from the claim text.