Car floor structures typically contain a number of smaller-scale features which make them challenging for vibro-acoustic modelling beyond the low frequency regime. The floor structure considered here consists of a thin shell floor panel connected to a number of rails through spot welds leading to an interesting multi-scale modelling problem. Structures of this type are arguably best modelled using hybrid methods, where a Statistical Energy Analysis (SEA) description of the larger thin shell regions is combined with a finite element model (FEM) for the stiffer rails. In this way the modal peaks from the stiff regions are included in the overall prediction, which a pure SEA treatment would not capture. However, in the SEA regions, spot welds, geometrically dependent features and directivity of the wave field are all omitted. In this work we present an SEA/FEM hybrid model of a car floor and discuss an alternative model for the SEA subsystem using Discrete Flow Mapping (DFM).
Comparison of Methods for Modelling Mid-to-High Frequency Vibro-Acoustic Energy Distributions in a Vehicle Floor Structure
Sae Technical Papers
9th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference ; 2016
2016-06-15
Conference paper
English
High Frequency Vibro-Acoustic Analysis Using Energy Finite Element Method
SAE Technical Papers | 2009
|Vibro-Acoustic Behavior of Vehicle Gearbox
SAE Technical Papers | 1997
|Modelling the Vibro-Acoustic Behaviour of a Double Wall Structure
British Library Conference Proceedings | 1992
|Vehicle Panel Vibro-Acoustic Behavior and Damping
SAE Technical Papers | 2003
|Vehicle panel vibro-acoustic behavior and damping
Automotive engineering | 2003
|