A NEW NVH SIMULATION METHODOLOGY TO EVALUATE THE INFLUENCE OF STRUCTURE-BORNE NOISE DESIGN CHANGES ON INTERIOR AIR-BORNE NOISE OF A TRIMMED BODY

摘要

In nowadays automotive industry, NVH structure-borne simulation at low and mid frequencies is typically carried out by means of Finite Elements (FE) and supports the body NVH development. In the context of lightweight treatments, the NVH design at low and mid frequencies by means of FE is also extended to the trim parts. For this, we have developed an optimisation method for the simultaneous design of trim, body shape and damping based on FE simulation. This procedure has been positively validated on a simplified body structure (plate box). Regarding air-borne noise at low and mid frequencies, a methodology for the simulation of Transmission Loss (TL) resp. Insertion Loss (IL) by means of FE has been developed. This methodology has been presented and validated against mass law (TMM) in the case of the same plate box. By using this type of simulation methodologies, we propose to evaluate the TL performance of an optimised solution for structure-borne noise design in order to verify the influence of structure-borne noise design changes on the interior body airborne noise.