Interior structure borne noise prediction of the cabin of a high speed train using FE-SEA hybrid methods

摘要

The interior noise levels in trains has been reduced considerably during the last decades. However, the acoustic behavior has nowadays an even more important role among the comfort parameters of high speed trains. The FE-SEA hybrid methodologies raised up during the last years have given a new approach to the problem of the structure borne noise, giving the opportunity to deal with the acoustic mid frequency range, where FE and SEA systems were unable to work. However this numerical models depend on several physical parameters and, although most of them are well known in fields like the automotive, they need to be further studied for the rolling stock applications. The present paper deals with the investigation process carried out by ALSTOM to set up a hybrid FE-SEA model of the cabin of a high speed train in order to predict the interior structure borne noise, from its first steps characterizing the most important transmission paths, to the structural responses predicted by given diverse model approaches.