NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Sound propagation over uneven ground and irregular topographyTheoretical, computational, and experimental techniques were developed for predicting the effects of irregular topography on long range sound propagation in the atmosphere. Irregular topography is understood to imply a ground surface that: (1) is not idealizable as being perfectly flat, or (2) that is not idealizable as having a constant specific acoustic impedance. The focus is 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
19880017527
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Berthelot, Yves H.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Pierce, Allan D.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Kearns, James A.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Zhou, Ji-Xun
(Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 5, 2013
Publication Date
August 1, 1988
Subject Category
Acoustics
Report/Patent Number
NAS 1.26:182956
NASA-CR-182956
Accession Number
88N26911
Funding Number(s)
CONTRACT_GRANT: NAG1-566
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available