Accession Number : AD0067880


Title :   REVIEW OF SOUND PROPAGATION IN THE LOWER ATMOSPHERE


Corporate Author : BROWN UNIV PROVIDENCE RI DEPT OF PHYSICS


Personal Author(s) : Nyborg, Wesley L ; Mintzer, David


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/067880.pdf


Report Date : May 1955


Pagination or Media Count : 234


Abstract : A critical review is given of available information on sound propagation through the lower atmosphere. The application is to the prediction of sound fields due to aircraft (in flight or on the ground), especially, at distances up to a few miles from the aircraft sound sources. Treatment of the prediction problem requires consideration of a number of topics including (1) absorption processes in the air, (2) boundary effects caused by the earth and (3) refraction of sound due to spatial variations in air temperature and wind. Although a fair amount of information is now available on these topics a considerable amount of research remains to be done before practical solutions will be available.


Descriptors :   *SOUND TRANSMISSION , *AIRCRAFT NOISE , PROPAGATION , PREDICTIONS , ACOUSTIC ABSORPTION , ATMOSPHERES , LOW ALTITUDE


Subject Categories : Acoustic Detection and Detectors
      Atmospheric Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE