Abstract
Recently, customer requirements for vehicle interior comfort have been increased and it becomes necessary not only to reduce sound level of interior noise but also to improve sound quality. During high speed cruising, aerodynamic noise becomes dominant in the interior noise. Especially, fluctuating aerodynamic noise which is generated by natural wind causes poor sound quality. To study vehicle geometry which reduces fluctuating aerodynamic noise at the early stage of vehicle development, prediction method is needed. This paper describes prediction method which is combined CFD (Computational Fluid Dynamics for transient pressure fluctuation and SEA (Statistical Energy Analysis) for structural acoustic to realize fluctuating aerodynamic noise in the cabin. It IS shown that interior fluctuating aerodynamic noise is different by a difference in geometry such as side view mirror and A-pillar corner.
