High Frequency Structure-borne Sound Simulations using a hybrid Dynamical Energy Analysis / Advanced Transfer Path Analysis Approach
* Presenting author
Dynamical Energy Analysis (DEA) is a mesh-based high frequency method modelling structure borne sound for complex built-up structures. This has proven to enhance vibro-acoustic simulations considerably by making it possible to work directly on existing finite element meshes circumventing time-consuming and costly remodeling strategies. In addition, DEA provides detailed spatial information about the vibrational energy distribution within a complex structure in the mid-to-high frequency range. DEA was successfully applied and validated to a structure borne sound calculation of an assembled agricultural tractor. Modelling solid structures is still a challenge for DEA, however, as it is based on 2D wave transmission calculations. We propose a novel method to generate DEA elements based on measurement data in order to model solid parts of a complex structure. Advanced Transfer Path Analysis (ATPA) is employed to extract energy transmission characteristics of a structure. First, Frequency Response Functions are measured between interface points on a structure. Then a direct transfer function between each interface points is calculated by using ATPA. Finally, DEA elements connecting interface points and representing energy transmission characteristics of the structure are created based on the ATPA result. Applications of the method will be presented.