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Sound propagation over uneven ground and irregular topographyTheoretical, computational, and experimental techniques for predicting the effects of irregular topography on long range sound propagation in the atmosphere was developed. Irregular topography here is understood to imply a ground surface that is not idealized as being perfectly flat or that is not idealized as having a constant specific acoustic impedance. The interest focuses on circumstances where the propagation is similar to what might be expected for noise from low altitude air vehicles flying over suburban or rural terrain, such that rays from the source arrive at angles close to grazing incidence.
Document ID
19870002142
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Kearns, J. A. (Georgia Inst. of Tech. Atlanta, GA, United States)
Pierce, A. D. (Georgia Inst. of Tech. Atlanta, GA, United States)
Main, G. L. (Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 5, 2013
Publication Date
October 1, 1986
Subject Category
Acoustics
Report/Patent Number
NAS 1.26:179827
NASA-CR-179827
SASR-3
Accession Number
87N11575
Funding Number(s)
CONTRACT_GRANT: NAG1-566
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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