NDLI: Aircraft interior noise reduction by alternate resonance tuning (Document No: 19910017575)

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Aircraft interior noise reduction by alternate resonance tuning (Document No: 19910017575)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gottwald, James A. Bliss, Donald B.
Copyright Year	1990
Description	The focus is on a noise control method which considers aircraft fuselages lined with panels alternately tuned to frequencies above and below the frequency that must be attenuated. An interior noise reduction called alternate resonance tuning (ART) is described both theoretically and experimentally. Problems dealing with tuning single paneled wall structures for optimum noise reduction using the ART methodology are presented, and three theoretical problems are analyzed. The first analysis is a three dimensional, full acoustic solution for tuning a panel wall composed of repeating sections with four different panel tunings within that section, where the panels are modeled as idealized spring-mass-damper systems. The second analysis is a two dimensional, full acoustic solution for a panel geometry influenced by the effect of a propagating external pressure field such as that which might be associated with propeller passage by a fuselage. To reduce the analysis complexity, idealized spring-mass-damper panels are again employed. The final theoretical analysis presents the general four panel problem with real panel sections, where the effect of higher structural modes is discussed. Results from an experimental program highlight real applications of the ART concept and show the effectiveness of the tuning on real structures.
File Size	7332294
Page Count	215
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19910017575
Archival Resource Key	ark:/13960/t5cc5x23s
Language	English
Publisher Date	1990-12-01
Access Restriction	Open
Subject Keyword	Acoustics Panels Propellers Noise Reduction Aircraft Noise Aircraft Compartments Pressure Distribution Resonance Fuselages Walls Tuning Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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