Vibroacoustic Source Mechanisms under Aeroacoustic Loads

Since the author’s AIAA-2002-2551 paper on aero-vibro-acoustic source components and transmission mechanisms under unsteady aerodynamic flows, other researchers have successfully applied the recommended wavenumber-frequency (k -ω ) analysis method to demonstrate the presence of an approximately “diffuse” acoustic source in turbulence. This paper expands the number of candidate wind noise source mechanisms to include propagating acoustic field loading and spatially-random (“rain on the roof”) loading. For the case of wind noise from an idealized side mirror turbulence transmitted through a vibrating panel – tested by University of Southampton in companion paper AIAA-2012-2201 each source is quantified using wavenumber analysis of large eddy simulation (LES) CFD results and applied to a statistical energy analysis (SEA) representation of the structural-acoustic system to validate the proposed mathematical model.