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Signal processing of jet noise from flyover test dataNarrow-band spectra characterizing jet noise are constructed from flyover acoustic measurements. Radar and c-band tracking systems provided the aircraft position histories which enabled directivity and smear angles from the aircraft to each microphone to be computed. These angles are based on source emission time and thus give some idea about the directivity of the radiated sound field due to jet noise. Simulated spectra are included in the paper to demonstrate spectral broadening due to smear angle. The acoustic data described in the study has application to community noise analysis, noise source characterization and validation of prediction models. Both broadband-shock noise and turbulent mixing noise are observed in the spectra. A detailed description of the signal processing procedures is provided.
Document ID
19930040829
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kelly, Jeffrey J.
(NASA Langley Research Center Hampton, VA, United States)
Wilson, Mark R.
(Lockheed Engineering & Sciences Co. Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 93-0736
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit
Location: Reno, NV
Country: United States
Start Date: January 11, 1993
End Date: January 14, 1993
Sponsors: AIAA
Accession Number
93A24826
Funding Number(s)
CONTRACT_GRANT: NAS1-19000
Distribution Limits
Public
Copyright
Other

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