Volume 128, Issue 6, December 2010
Index of content:
- AEROACOUSTICS, ATMOSPHERIC SOUND 
128(2010); http://dx.doi.org/10.1121/1.3506352View Description Hide Description
The cylindrical and spherical harmonic expansions of oscillating sound fields rotating at a constant rate are derived. These expansions are a generalized form of the stationary sound field expansions. The derivations are based on the representation of interior and exterior sound fields using the simple source approach and determination of the simple source solutions with uniform rotation. Numerical simulations of rotating sound fields are presented to verify the theory.
128(2010); http://dx.doi.org/10.1121/1.3500678View Description Hide Description
An exact series expansion for the field radiated by a monopole ring source with angular variation in source strength is derived from a previously developed expression for the field from a finite disk. The derived series can be used throughout the field, via the use of a reciprocity relation, and can be readily integrated to find the field radiated by arbitrary circular sources of finite extent, and differentiated to find the field due to higher order sources such as dipoles and quadrupoles.