Insulation design for thermal and acoustic insulation of an...

Details Insulation design for thermal and acoustic insulation of an... Insulation design for thermal and acoustic insulation of an...

B - Operations, Transporting

64

C

B64C 1/40 (2006.01) F16L 59/02 (2006.01) G10K 11/168 (2006.01)

Patent

CA 2698259

The invention pertains to an insulation structure (2) for thermally and acoustically insulating an aircraft that features at least one heavy layer (8), wherein the insulation structure (2) according to the invention is characterized in that the insulation structure (2) comprises an additional absorption layer (6), in that the heavy layer (8) is perforated at least in certain areas and in that the perforated area ratio of the heavy layer is adapted in such a way that the heavy layer (8) is essentially transparent to sound for frequencies below a double-wall frequency of the insulation structure (2). This makes it possible to dampen sound with low frequencies below the double- wall frequency as effectively as possible.

L'invention concerne une structure d'isolation (2) pour l'isolation thermique et acoustique d'un aéronef, présentant au moins une couche lourde (8). La structure d'isolation (2) se caractérise en ce qu'elle présente une couche d'absorption supplémentaire (6), la couche lourde (8) est perforée au moins par endroits et la proportion de surface perforée de la couche lourde est ajustée de telle façon que la couche lourde (8) soit sensiblement acoustiquement transparente pour des fréquences inférieures à une fréquence de double paroi de la structure d'isolation (2). Ainsi, il est possible d'isoler autant que possible le son basse fréquence sous la fréquence de double paroi.

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