Dynamical energy analysis applied to real-world structures—New developments

Abstract

Dynamical Energy Analysis (DEA) has been established as a mesh-based ray tracing method working at mid-to-high excitation frequencies for structure-borne sound on complex vehicle structures. Unless standard ray-tracing used, for example, in room acoustics and following long rays through a series of specular reflections, DEA is based on an integral representation by (a) reformulating the energy transport problem in terms of ray densities and linear matrix equations and by (b) applying the ray tracing directly on preexisting meshes used also in, for example, FEM calculations. The advantage is that DEA can be used as a drop-in replacement for FEM tool working on the same meshes but determining results at very high frequencies. In order to achieve this, a so-called transfer matrix has to be created and later solved for the energy equilibrium distribution. In this presentation, we address recent developments in making DEA an efficient black-box tool for mid- to high-frequency vibrations including convergence issues and suitable preprocessor applications, sound radiation from DEA calculations as well as verification and validation studies.Dynamical Energy Analysis (DEA) has been established as a mesh-based ray tracing method working at mid-to-high excitation frequencies for structure-borne sound on complex vehicle structures. Unless standard ray-tracing used, for example, in room acoustics and following long rays through a series of specular reflections, DEA is based on an integral representation by (a) reformulating the energy transport problem in terms of ray densities and linear matrix equations and by (b) applying the ray tracing directly on preexisting meshes used also in, for example, FEM calculations. The advantage is that DEA can be used as a drop-in replacement for FEM tool working on the same meshes but determining results at very high frequencies. In order to achieve this, a so-called transfer matrix has to be created and later solved for the energy equilibrium distribution. In this presentation, we address recent developments in making DEA an efficient black-box tool for mid- to high-frequency vibrations including convergence i...