Summary
Dynamical Energy Analysis (DEA) is an operator based ray-tracing approach used to compute the vibro-acoustic response of complex structures to external forcing in the high-frequency limit. So far, DEA has been applied to model uncorrelated point force excitations. In this work, we will show how to adapt DEA to incorporate correlated input force excitations distributed over large regions. An example of such an excitation is the pressure field given by a Turbulent Boundary Layer (TBL) acting, for example, on an airplane wing. The properties of these excitations are captured by a source ray density function, which is calculated from an appropriate correlation function representing the applied pressure field via Wigner transformation. The source density is used for a structure-borne sound computation using standard DEA software. Results are presented for the vibrational energy distribution across a flat plate excited by a fully formed, stationary, TBL under a variety of flow and material properties, and boundary conditions.
