GLTRS--Glenn
TITLE AND SUBTITLE:
Jet Noise Source Localization Using Linear Phased Array

AUTHOR(S):
Femi A. Agboola and James Bridges

REPORT DATE:
April 2004

FUNDING NUMBERS:
WBS-22-781-30-27

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-14478

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-2004-213041

SUPPLEMENTARY NOTES:
Femi A. Agboola, National Research Council-National Research Associate at Glenn Research Center; and James Bridges, NASA Glenn Research Center. Responsible person, James Bridges, organization code 5940, 216-433-2693.

ABSTRACT:
A study was conducted to further clarify the interpretation and application of linear phased array microphone results, for localizing aeroacoustics sources in aircraft exhaust jet. Two model engine nozzles were tested at varying power cycles with the array setup parallel to the jet axis. The array position was varied as well to determine best location for the array. The results showed that it is possible to resolve jet noise sources with bypass and other components separation. The results also showed that a focused near field image provides more realistic noise source localization at low to mid frequencies.

SUBJECT TERMS:
Plumes; Beamforming; Suppressors; Aerodynamic noise; Coaxial nozzles; Noise reduction; Noise generators; Jet aircraft noise; Jet aircraft; Aeroacoustics; Phased arrays; Linear arrays

NUMBER OF PAGES:
17

PDF AVAILABLE FROM URL:
2004/TM-2004-213041.pdf ( 1,091 KB )
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