Analysis of the energy exchange between coupled subsystems by means of the divergence in the vibratory energy field

One way of analysing a system with respect to its acoustical properties is to take a look at energetic phenomena and behaviours. A method widely used is the description of the energy flow in terms of acoustic intensities in both the structure and the fluid. With this approach, a link between the excitation and the radiation is created. In order to get a more holistic view on the acoustical chain of effects, this paper and the related work aims for a better understanding of the mechanisms that link different subsystems. This is done by analysing the energy transfer over system boundaries. In this paper, the equations are derived to quantify the exchange of structure-based vibratory energy and the first numerical calculation results are shown for a simple test case.