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AssigneesSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A.", Ateca, Hispano Suiza Aerostructures
InventorsOsmin Regis Delverdier, Patrick Gonidec, Jacques Michel Albert Julliard, Bernard Louis Le Barazer, Eric Lecossais, Georges Jean Xavier Riou, Philippe Jean Marcel Vie
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A soundproofing panel comprises a honeycomb core sandwiched between a solid skin and a porous skin, the cells of the honeycomb being divided in the direction of its thickness into at least two resonant cavities by a least one partition which is traversed by passages interlinking the cavities. The partitions are formed by a plurality of hollow microbeads having porous walls, the microbeads being bonded to one another and to the walls of the honeycomb at their points of contact. Such a soundproofing panel combines high performance in terms of linearity as a function of the level of sound excitation, attenuation band, bulk and mechanical strength.
A soundproofing panel comprising a solid skin defining one face of said panel, a porous skin defining the opposite face of said panel, and a honeycomb core sandwiched between and bonded to said solid skin and said porous skin, said honeycomb core comprising walls extending in the direction of the thickness of said honeycomb core between the two skins to define cells of said honeycomb core, at least one partition in each of said cells dividing the cell into at least two cavities in the direction of the thickness of said honeycomb core, said partitions having edges which are in contact with and bonded to said walls defining said cells, and means defining passages which extend through said partitions to interconnect said cavities, wherein said partitions are each formed by a plurality of hollow spherical microbeads having porous walls, said microbeads being in mutual contact with each other and being adhesively bonded together at their points of contact, and the microbeads at said edges of said partitions being adhesively bonded to said walls of said cells at points of contact between said microbeads and said walls, and wherein said partitions have a thickness which is at least equal to 15% of the thickness of said honeycomb core.
Dependencies are inferred from the claim text.