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Application of an Aligned and Unaligned Signal Processing Technique to Investigate Tones and Broadband Noise in Fan and Contra-Rotating Open Rotor Acoustic SpectraThe study of noise from a two-shaft contra-rotating open rotor (CROR) is challenging since the shafts are not phase locked in most cases. Consequently, phase averaging of the acoustic data keyed to a single shaft rotation speed is not meaningful. An unaligned spectrum procedure that was developed to estimate a signal coherence threshold and reveal concealed spectral lines in turbofan engine combustion noise is applied to fan and CROR acoustic data in this paper.
Document ID
20150022169
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Miles, Jeffrey Hilton
(NASA Glenn Research Center Cleveland, OH United States)
Hultgren, Lennart S.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
December 2, 2015
Publication Date
October 25, 2015
Subject Category
Acoustics
Report/Patent Number
ISABE-2015-20243
GRC-E-DAA-TN25297
Meeting Information
Meeting: International Society of Airbreathing Engines (ISABE)
Location: Phoenix, AZ
Country: United States
Start Date: October 25, 2015
End Date: October 30, 2015
Sponsors: International Society on Air Breathing Engines
Funding Number(s)
WBS: WBS 081876.02.03.50.03.06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
Noise
Aeroacoustics
Turbomachinery
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