Modelling of high-frequency structure-borne sound transmission on FEM grids using the Discrete Flow Mapping technique

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Hartmann, Timo^1 ; Tanner, Gregor^1 ; Xie, Gang^2 ; Chappell, David^3 ; Bajars, Janis^3

School of Mathematical Sciences, University of Nottingham, United Kingdom^1

CDH AG, Herbolzheim, Germany^2

Nottingham Trent University, United Kingdom^3

关键词: Built-up structures;    Finite element meshes;    High-frequency methods;    Modelling strategies;    Spatial informations;    Structure borne sound;    Transmission paths;    Vibrational energy distribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012237/pdf
DOI  :  10.1088/1742-6596/744/1/012237

来源: IOP

【 摘 要 】

Dynamical Energy Analysis (DEA) combined with the Discrete Flow Mapping technique (DFM) has recently been introduced as 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 re-modelling strategies. In addition, DFM provides detailed spatial information about the vibrational energy distribution within a complex structure in the mid-to-high frequency range. We will present here progress in the development of the DEA method towards handling complex FEM-meshes including Rigid Body Elements. In addition, structure borne transmission paths due to spot welds are considered. We will present applications for a car floor structure.