Modeling airborne interior noise in full vehicles using statistical energy analysis

Abstract

SEA is particularly well suited for predicting airborne noise in vehicles. The acoustic sources found in such environment are typically spatially distributed around the vehicle and can be well represented with SEA diffuse acoustic loads. Multiple transmission paths contribute to interior noise levels including (1) mass law transmission through trimmed panels, (2) resonant radiation from vibrating structures, and (3) flanking paths through gaskets, seals, and holes. All these transmission mechanisms may be modeled using SEA techniques. Finally, interior trim (including carpet, headliner, seats) is a key contributor to the acoustic performance of modern vehicles. The vehicle sound package has a significant impact on both the strength of the transmissions paths into the vehicle as well as the acoustic absorption in the cabin. Both these effects can be accounted for with SEA through detailed models of the trim. SEA models of full vehicles are usually validated against experimental results at both component and system levels. The models can then be confidently used to (a) rank key design parameters governing interior levels and (b) quickly evaluate the impact of potential design changes. Example vehicle models and correlation results are presented here.