On the Use of BEA with Engine Simulation as an Input to Predict Air Induction Inlet Noise

Engine air induction noise can play a significant role in the reduction of vehicle interior noise levels and tuning interior sound quality. Given the need to reduce prototyping and testing costs, it is important to gain an understanding of the level and frequency structure of the noise radiating from the open inlet of the air induction system. Engine simulation used independently can predict inlet noise; however, its utility is limited to systems that are largely one-dimensional. Systems that exhibit a three-dimensional nature, such as the wave dynamics in an engine air cleaner, require a more intensive approach. Boundary Element Analysis (BEA) has been demonstrated to be a tool that can be used to predict the frequency response of ducted systems and is particularly useful in highly three-dimensional systems. The use of engine simulation to obtain the proper inputs to the BEA can fill this gap in the prediction of radiated noise levels while including the frequency structure or order content inherent in air induction noise. The utility of this approach in the product development cycle and associated results are discussed.