Cabin Interior Noise Acoustic Assessment under the Influence of Air Intake System: Simulation and Experimental Investigation

This paper presents an assessment of the cabin interior noise under the influence of the AIS (Air Intake System). The AIS is one of the four main noise sources present in the vehicle and is therefore necessary to evaluate its contribution and thus improve its noise emission levels. It is also important to achieve the acoustics targets during the development phase, as noise and vibration are still amongst the main causes for problems at the last design and even pre-release stages.

In order to assess the vibroacoustic behaviour and reduce the extent of the virtual prototype phase, durability and acoustic models was integrated. Using these models, stress and fatigue were checked. Modal and structural analyses were performed, orifice noise and radiated noise evaluated. Also SPL (Sound Pressure Level) was computed at the driver and passenger's ear location. Fluid/structure interaction analyses verify the AIS and cabin coupled response effects in the interior noise. Following that, simulation and experimental measurements were compared. The comparison shows the AIS structural frequencies that have significant contribution to the interior sound pressure level.

These analyses also show the advantages of the integration between durability and acoustic numerical models, reducing cost and time during the project virtual phase. From now this paper gives a brief description on how to perform cabin interior noise analyses under the influence of AIS.