EFFECTS OF A FLUID IN UNIFORM-FLOW ON VIB ROACOUSTIC BEHAVIOR OF A BAFFLED PLATE COUPLED TO A RECTANGULAR CAVITY

The purpose of this work is to develop a general formulation to deal w ith the vibro-acoustic behavior of a baffled plate, immersed on one si de in a mean flow and coupled on the other side to a rectangular cavit y with arbitrary wall impedances. The plate is excited by a plane wave convected by the mean flow. The formulation is based on a finite elem ent method for the calculation of the transverse vibrations of the pla te and the acoustic field inside the cavity. The external fluid loadin g is accounted for through the extended Kirchoff-Helmoltz integral equ ation and the radiation impedance of the plate in the external fluid i s computed with a boundary element method. The mean flow effects on th e transmission loss of the plate are discussed.