Abstract
An analysis of sound-pressure fields relative to both uniformly translating and space-fixed reference frames is presented. By using Fourier transforms and separation of variables, a solution is determined in the source frame. Far-field approximations are transformed to emission coordinates which model the pressure field observed in a space-fixed reference frame. The influence of mean flow/forward flight on source-fixed directivity patterns is shown. A finite cylindrical source was considered and directivity patterns were constructed which show the effect of Mach number, frequency, and displacement pattern on the sound field. The influence of flow on absorption due to viscosity is also presented.
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