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Development of the Acousti-Cap™ Technology for Double-Layer Acoustic Liners in Aircraft Engine Nacelles
Technical Paper
2007-01-3792
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Acoustically absorptive liners are used in the inlet and exhaust ducts of commercial aircraft engines. A double layer acoustic liner consists of a porous face sheet, a porous septum, an impervious back sheet, and a honeycomb structure. The Acousti-Cap™ technology, developed by Hexcel Corporation, is a significant innovation in the manufacture of double layer acoustic liners. It consists of a non-metallic permeable cap material embedded into each cell of the honeycomb core to create an acoustic septum. This paper presents details of the extensive acoustic testing and analysis carried out to support the development of acoustic liners with embedded mesh-caps.
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Authors
Citation
Syed, A., Ichihashi, F., Smith, C., and Ayle, E., "Development of the Acousti-Cap™ Technology for Double-Layer Acoustic Liners in Aircraft Engine Nacelles," SAE Technical Paper 2007-01-3792, 2007, https://doi.org/10.4271/2007-01-3792.Also In
References
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- Syed, Asif A. Michael J. Perrino “The effects of manufacturing processes on the discharge coefficient of the perforated face sheet of an acoustic liner,” paper presented at INTER NOISE 2006 December 3-5 Honolulu, Hawaii, USA
- ASTM E-1050 “Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital Frequency Analysis System.”
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- Kraft, R. E. Yu J. Kwan H. W. NASA CR-1999-209120 “Acoustic Treatment Design Scaling Methods - Volume 2: Advanced Treatment Impedance Models for High Frequency Ranges.” April 1999
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