Material for absorbing noise in aircraft

US7946525B2 · kind B2 · utility

Assignee

• LUFTHANSA TECHNIK AG · DE

Inventor

• Malte Gröning · Hamburg, DE

Key dates

• Filing date: Apr 28, 2006
• Grant date: May 24, 2011
• Expiry date: Jul 12, 2028

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64C1/403
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a material for absorbing noise in aircraft, comprising at least one barrier layer and at least one absorptive layer. The barrier layer is provided with an elastomeric material having a minimum specific density of 1 and a mass per unit area of 1.3 kg/m2 or less while the absorptive layer is equipped with a porous and/or open-cell material having a weight per volume of 4 to 50 kg/m3, preferably 10 to 40 kg/m3, more preferably 15 to 35 kg/m3 even more preferably 20 to 30 kg/m3. The mass per unit area of the sound-absorbing material amounts to 2 kg/m2 or less.