Virginia Tech. Department of Mechanical EngineeringProctor & Gamble CompanyGrimm, Denny W.Hurst, Charles J.2015-05-272015-05-271979-12-01Grimm, D. W., & Hurst, C. J. (1979). A geometric acoustics approach to the study of sound propagation in ducts containing sheared flows. Journal of the Acoustical Society of America, 66(6), 1867-1875. doi: 10.1121/1.3836190001-4966http://hdl.handle.net/10919/52661Geometric acoustics has been used to study the propagation of sound waves in a homogeneous moving medium with sheared flow bounded by the hard walls of a duct. Differential equations describing the ray trajectories and the spreading losses along each ray were developed and solved numerically for a range of centerline Mach numbers and shear boundary-layer thicknesses. Results were obtained which show the effects of upstream and downstream sound propagation on the ray paths. A method was also developed to allow the calculation of intensity loss profiles at specified downstream cross sections of the duct.9 pagesapplication/pdfen-USIn CopyrightDuct flowsShear flowsSound propagationAcoustical effectsDifferential equationsArticle - Refereedhttp://scitation.aip.org/content/asa/journal/jasa/66/6/10.1121/1.383619https://doi.org/10.1121/1.383619