Radiated Sound Control by Structural Energy Flow Control of Panel Structure

Abstract

This paper makes clear the relation between structural intensity (SI) and acoustical intensity (AI) distributions in order to discuss the possibility of AI control by controlling SI distributions. At first the formula of bending displacement, SI and AI are summarized and the relationship among them are discussed theoretically. The numerical simulation is carried out to confirm and discuss the relationship and the controllability o f SI to AI b y using a simply supported steel panel. As a result, it is shown that the AI distribution is similar with the SI distribution under the panel with high damping. Also we discuss the characteristics of structural vibration and radiated sound under two typical SI distribution forms – vortex-typed and non-vortex-typed. And then we conclude that the SI control can control AI distribution under high damping structure, for example to control the acoustical transmitted power above the panel.