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Annoyance judgements of aircraft with and without acoustically treated nacellesA series of subjective response laboratory tests were conducted to determine the effectiveness of reducing aircraft noise by treating the aircraft engine nacelles with acoustically absorbent material. A total of 108 subjects participated in the magnitude estimation tests. The subjects were selected from persons who had previously been interviewed and classified according to selected psychological characteristics. The subjects lived in three general areas located at three specified distances from New York's Kennedy Airport. The aircraft signals used in the tests consisted of tape recordings of the landing approach noise of a B-727 aircraft under normal operating conditions. These recordings were electronically altered to simulate an aircraft with acoustically treated nacelles to achieve noise reductions of approximately 6 EPNdB and 12 EPNdB. The results from these tests indicate that significant reductions in annoyance resulted from the synthesized nacelle treatments.
Document ID
19730022209
Document Type
Contractor Report (CR)
Authors
Borsky, P. N. (Columbia Univ. New York, NY, United States)
Leonard, S. (Columbia Univ. New York, NY, United States)
Date Acquired
September 2, 2013
Publication Date
August 1, 1973
Subject Category
AIRCRAFT
Report/Patent Number
NASA-CR-2261
Funding Number(s)
CONTRACT_GRANT: NGL-33-008-118
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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