Sound radiation from point acoustic stresses in circular motion

The general result for the sound field of a point acoustic stress in arbitrary motion is applied in this paper to study the effects of (i) uniform straight-line motion, (ii) uniform circular motion and (iii) pure rotation on the overall sound radiation from random point acoustic stresses. The effects of acceleration of the stresses due to steady rotation in a circle are established, using the moving-source approach adopted in two previous papers for the far-field sound radiation from rotating point forces and point sources. Applications include the turbulent sound generation from tip jet rotors and noise from rotating blades with distributed forces.