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A new version of the helicopter aural detection program, ICHINNASA Langley Research Center personnel have conducted an evaluation of the helicopter aural detection program I Can Hear It Now (ICHIN version-5). This was accomplished using flight noise data of five helicopters, obtained from a joint NASA and U.S. Army acoustics measurement program. The evaluation consisted of presenting the noise data to a jury of 20 subjects and to the ICHIN-5 program. A comparative study was then made of the detection distances determined by the jury and predicted by ICHIN-5. This report presents the changes made in the ICHIN-5 program as a result of this comparative study. The changes represent current psychoacoustics and propagation knowledge.
Document ID
19860020999
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Mueller, A. W. (NASA Langley Research Center Hampton, VA, United States)
Smith, C. D. (PRC Kentron, Inc. Hampton, Va., United States)
Shepherd, K. P. (Bionetics Corp. Hampton, Va., United States)
Sullivan, B. M. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1986
Subject Category
Acoustics
Report/Patent Number
NASA-TM-87745
NAS 1.15:87745
Accession Number
86N30471
Funding Number(s)
PROJECT: RTOP 505-63-91-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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