NDLI: Computer method for design of acoustic liners for turbofan engines

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Computer method for design of acoustic liners for turbofan engines

Content Provider	NASA Technical Reports Server (NTRS)
Author	Rice, E. J. Minner, G. L.
Copyright Year	1976
Description	A design package is presented for the specification of acoustic liners for turbofans. An estimate of the noise generation was made based on modifications of existing noise correlations, for which the inputs are basic fan aerodynamic design variables. The method does not predict multiple pure tones. A target attenuation spectrum was calculated which was the difference between the estimated generation spectrum and a flat annoyance-weighted goal attenuated spectrum. The target spectrum was combined with a knowledge of acoustic liner performance as a function of the liner design variables to specify the acoustic design. The liner design method at present is limited to annular duct configurations. The detailed structure of the liner was specified by combining the required impedance (which is a result of the previous step) with a mathematical model relating impedance to the detailed structure. The design procedure was developed for a liner constructed of perforated sheet placed over honeycomb backing cavities. A sample calculation was carried through in order to demonstrate the design procedure, and experimental results presented show good agreement with the calculated results of the method.
File Size	14261179
Page Count	94
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19760026866
Archival Resource Key	ark:/13960/t7jq5rn5v
Language	English
Publisher Date	1976-10-01
Access Restriction	Open
Subject Keyword	Acoustics Sound Waves Sound Propagation Noise Reduction Computer Techniques Linings Turbofan Engines Sound-sound Interactions Mathematical Models Acoustic Ducts Honeycomb Structures Design Analysis 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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