ACOUSTIC RADIATION DAMPING OF FLAT RECTANGULAR-PLATES SUBJECTED TO SUBSONIC FLOWS .1. ISOTROPIC

The acoustic radiation damping for various plates and semi-infinite st rips subjected to a uniform, subsonic and steady flow has been predict ed. The predictions are based on the linear vibration of a flat plate. The fluid loading is characterized as the perturbation pressure deriv ed from the linearized Bernoulli and continuity equations. Parameters varied in the analysis include Mach number, mode number and plate size , aspect ratio and mass. Results show that the fluid loading can signi ficantly affect realistic plate responses. In addition, acoustic radia tion damping values can be greater than or equal to the structural com ponent of the modal critical damping ratio (assumed as 0.01) for the h igher subsonic Mach numbers.