Responses of finite baffled plate to turbulent flow excitations
Abstract
In deriving the formulations for estimating dynamic and acoustic responses of a finite baffled plate subject to a turbulent boundarylayer excitations, the effects of structural nonlinearities are considered. The excitation force due to turbulent flow are expressed in terms of a sum of two components: (1) one that corresponds to a fluctuating pressure field due to acoustic radiation, (2) the other corresponds to a fluctuating pressure field due to a turbulent boundary layer. The crosspower spectra of the plate flexural displacement and the radiated acoustic pressure are shown to be directly related to that of the turbulent boundary layer. A stability analysis which uses the basic existenceuniqueness theorem is presented. It is shown that temporal instability can be induced by the added stiffness due to acoustic radiation in the presence of mean flow.
 Publication:

AIAA Journal
 Pub Date:
 January 1995
 DOI:
 10.2514/3.12326
 Bibcode:
 1995AIAAJ..33...13W
 Keywords:

 Aeroacoustics;
 Baffles;
 FluidSolid Interactions;
 Plates (Structural Members);
 Pressure Distribution;
 Sound Waves;
 Turbulent Boundary Layer;
 Turbulent Flow;
 Dynamic Response;
 Excitation;
 Galerkin Method;
 Power Spectra;
 Sound Pressure;
 Stiffness;
 Structural Vibration;
 Turbulence;
 Fluid Mechanics and Heat Transfer