Passenger door Transmission Loss improvement in a train using a vibro-acoustic numerical model combining deterministic and statistical techniques

摘要

Interior noise is a challenge for Rolling Stock manufacturers in the search for a comfortable travel experience. A comfortable experience means quiet environments, which are incompatible with phone conversations. That's the reason why normally phone conversations are done in vestibule areas. On the other hand, vestibule areas are noisier than passengers areas so it is more difficult to have phone conversations. Doors are one of the main airborne noise contributors on those areas, so an improvement of its Transmission Loss (TL) should induce a reduction on the interior noise. This paper deals with the setting-up of a reliable numerical model using "FE/SEA" hybrid techniques in order to predict the TL of a passenger door and to be able to propose design modifications for its improvement. The FE model and its correlation with an Experimental Modal Analysis is presented. An exposition of the "FE/SEA" hybrid vibro-acoustic model created taking as a reference the correlated FE model is included. The TL numerical results using the "FE/SEA coupled" are compared with experimental data. And finally some design modifications in order to improve the door acoustic performances are presented.