Acoustic panel

G - Physics – 10 – K

Patent

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Details

G10K 11/172 (2006.01) F02C 7/045 (2006.01)

Patent

CA 2678405

The invention relates to a panel for an acoustic treatment at the surface of an aircraft, that comprises from the outside to the inside an acoustically resistive porous layer, at least one cellular structure and a reflective or non-permissive layer, wherein the acoustically resistive porous layer includes, at the outer surface that may contact the aerodynamic flows of a sheet or foil, open areas (14) permissive to sound waves and solid area (6) not permissive to sound waves, characterised in that the sheet or foil of the acoustically resistive layer includes sets of microperforations (18), each set of microperforations defining an open area (14), the set of microperforations being separated by at least one series of spaced bands of solid areas (16).

L'objet de l'invention est un panneau pour le traitement acoustique rapporté au niveau d'une surface d'un aéronef, comprenant de l'extérieur vers l'intérieur une couche poreuse acoustiquement résistive, au moins une structure alvéolaire et une couche réflectrice ou imperméable, ladite couche poreuse acoustiquement résistive comprenant au niveau de la surface extérieure susceptible d'être en contact avec les écoulements aérodynamiques une feuille ou tôle comprenant des zones ouvertes (14) laissant passer les ondes sonores et des zones pleines (16) ne laissant pas passer les ondes sonores, caractérisé en ce que la feuille ou tôle de la couche acoustiquement résistive comprend des ensembles de microperforations (18), chaque ensemble de microperforations formant une zone ouverte (14), les ensembles de microperforations étant séparés entre eux par au moins une série de bandes espacées de zones pleines (16).

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