Detection of energy sinks and sources in the active vibratory energy field of coupled structures and systems with fluid-structure interaction

摘要

In this paper, an approach to obtain a holistic description of the acoustic chain of effects in a system with fluid-structure interaction based on energy quantities is considered. The approach is based on sound intensity and structural intensity. Both quantities offer detailed information about the propagation of the energy flow. The divergence of the structural intensity is introduced as a quantity that provides detailed information about the location of energy sources and the structure's behaviour in areas where energy is dissipated. To prove the ability of the divergence to identify sources and sinks, an analysis is conducted on a simply supported rectangular plate. A simple approach to examine the energy transfer between subsystems in a coupled structure is defined and its potential is illustrated in a simple example. For this purpose the divergence calculation is applied to a structure consisting of three plates, where a smaller plate in the middle serves as connection between two bigger plates. Furthermore, the mutual reaction between the divergence of structural and sound intensity is analysed. The studies of the divergence of the acoustic intensities show their potential to obtain a more detailed knowledge of the acoustic chain of effects.