Acoustic lining for an aircraft, including a frost treatment...

B - Operations – Transporting – 64 – D

Patent

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Details

B64D 33/02 (2006.01) B64C 1/40 (2006.01) B64D 15/12 (2006.01) B64D 15/16 (2006.01) F02C 7/045 (2006.01) G10K 11/172 (2006.01)

Patent

CA 2669173

The invention relates to acoustic lining for an aircraft, which can cover a leading edge, such as an air inlet in the nacelle of a propulsion unit, said lining comprising: (i) from the inside outwards, a reflective layer (28), at least one cellular structure (30) and an acoustically resistive structure (32) having a pre-determined proportion of open surface; and (ii) at least one frost treatment system in the form of at least one heating layer (46) comprising open zones through which acoustic waves can pass, which co-operate at least partially with the open zones in the acoustically resistive structure. The invention is characterised in that the acoustically resistive structure (32) includes at least one structural layer (36) with openings (38) and in that said at least one heating layer (46) is disposed under the structural layer (36).

L'objet de l'invention est un revêtement acoustique pour aéronef, susceptible de recouvrir un bord d attaque, tel que par exemple une entrée d air d une nacelle d un ensemble propulsif, ledit revêtement acoustique comprenant d une part de l intérieur vers l extérieur une couche réflectrice (28), au moins une structure alvéolaire (30) et une structure acoustiquement résistive (32) possédant un taux déterminé de surface ouverte, et d autre part, au moins un système de traitement du givre sous la forme d au moins une couche chauffante (46) comportant des zones ouvertes susceptibles de laisser passer les ondes acoustiques qui coopèrent au moins en partie avec les zones ouvertes de la structure acoustiquement résistive, caractérisé en ce que la structure acoustiquement résistive (32) comprend au moins une couche structurale (36) avec des ouvertures (38) et en ce que ladite au moins une couche chauffante (46) est disposée sous la couche structurale (36).

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