NDLI: Aircraft interior noise reduction by alternate resonance tuning (Document No: 19890006313)

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Aircraft interior noise reduction by alternate resonance tuning (Document No: 19890006313)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Burton II, James R. Gustaveson, Mark B. Gottwald, James A. Castellino, Craig Bliss, Donald B.
Copyright Year	1989
Description	Existing interior noise reduction techniques for aircraft fuselages perform reasonably well at higher frequencies, but are inadequate at lower, particularly with respect to the low blade passage harmonics with high forcing levels found in propeller aircraft. A method is being studied which considers aircraft fuselages lines with panels alternately tuned to frequencies above and below the frequency to be attenuated. Adjacent panels would oscillate at equal amplitude, to give equal source strength, but with opposite phase. Provided these adjacent panels are acoustically compact, the resulting cancellation causes the interior acoustic modes to become cut off and therefore be non-propagating and evanescent. This interior noise reduction method, called Alternate Resonance Tuning (ART), is currently being investigated both theoretically and experimentally. This new concept has potential application to reducing interior noise due to the propellers in advanced turboprop aircraft as well as for existing aircraft configurations. This program summarizes the work carried out at Duke University during the third semester of a contract supported by the Structural Acoustics Branch at NASA Langley Research Center.
File Size	958364
Page Count	21
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890006313
Archival Resource Key	ark:/13960/t0rr6r913
Language	English
Publisher Date	1989-01-01
Access Restriction	Open
Subject Keyword	Acoustics Panels Turboprop Aircraft Propellers Resonant Frequencies Noise Reduction Forced Vibration Aircraft Compartments Fuselages Alternations 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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