Author:

Keywords:

NVH Optimizations, Structural modification, Bead panels, substructuring

Abstract:

In automotive industry, Computer-Aided Engineering (CAE) methods are increasingly used to predict the various functional performance attributes (noise and vibration, crashworthiness, etc.) and adapt the design based on the outcome of virtual simulations, such as numerical Finite Element (FE) models. This framework is aimed at testing and validating methodologies for NVH optimizations, based on local modifications that affecting the global dynamic behavior in order to reduce the Sound Pressure Level (SPL). From the entire FE model, built by using linear shell elements, a critical component is firstly individualized and subsequently subject to structural modifications. Bead patterns are created by only acting on the nodal positions according to Mesh Morphing. The combination between modal reduction and Wave-Based Substructuring (WBS) allows fast and accurate NVH predictions, enabling structural optimizations. The proposed procedure is applied on a case study FE model (Concrete Car) from which the spare wheel panel has been selected as critical component. A WBS-reduced representation is achieved, where the panel is still in FE representation enabling modifications on it, while the remainder is reduced. Various optimization approaches, based on different kinds of dynamic analysis, have been tested leading to a significant SPL reduction.