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Location of noise sources using a phase-slope methodTwo three-element microphone arrays have been used to predict the position of both pure-tone and broadband noise sources in an anechoic chamber under different ground impedance conditions. Source positions are predicted using the slope of phase-frequency plots between array elements. A phase-slope method for quantitatively assessing both the accuracy and precision of estimates of noise source location is introduced and illustrated. When the phase-slope method is used, there is higher accuracy and more precision in estimates of source location with a small ground impedance than with a large ground impedance. As would be expected, ground impedance effects are larger for low elevation angles than for high elevation angles.
Document ID
19860006571
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Deloach, R. (NASA Langley Research Center Hampton, VA, United States)
Preisser, J. S. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
November 1, 1985
Subject Category
Acoustics
Report/Patent Number
NAS 1.60:2505
L-15793
NASA-TP-2505
Report Number: NAS 1.60:2505
Report Number: L-15793
Report Number: NASA-TP-2505
Accession Number
86N16041
Funding Number(s)
PROJECT: RTOP 505-31-33-13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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