Patent ID: 8327976
Filing Date: 2012-12-11
Classification: B64C,F16L,G10K,Y02T,Y10T

Abstract:
1. An insulation structure for thermally and acoustically insulating an aircraft, the aircraft having a fuselage with an outer skin and an inner fuselage side, the insulation structure comprising: the outer skin; an insulation layer arranged at a distance from the outer skin, thereby defining an air volume therebetween; at least one heavy layer arranged on the insulation layer on facing away from the outer skin; and an absorption layer positioned on the heavy layer facing away from the outer skin; wherein the heavy layer is perforated at least in certain areas defining a plurality of holes therein, and wherein a ratio of the area of the plurality of holes provided in the perforated area to the entire area of the heavy layer is configured in such a way that the heavy layer is essentially transparent to sound for frequencies below a double-wall resonance frequency of the structure consisting of the outer skin, the insulation layer, the absorption layer, the heavy layer and the air volume between the outer skin and the insulation layer.