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Sound propagation in a typical automotive air handling system was studied using the finite element and boundary element methods. The focus was on sound propagation characters and critical resonant frequencies of the system. A given sound source was applied as the excitation to the system. Frequency response analyses were performed, emphasizing the low and mid frequency ranges. The predicted critical frequencies, associated modal configurations, and corresponding sound pressure level fields were investigated. Both the finite element and boundary element methods were applied, and results by the two methods were compared and discussed.

In the present study, the acoustic performance of an automotive air handling system is analyzed using computational aeroacoustics methods. The purpose of this study is to develop a comprehensive method to quantify noise sources and predict sound quantities at any location in the system as well as in the exterior field. Flow of air and vibration of structures are solved simultaneously in the time domain. Results are then postprocessed to derive sound sources. Sound pressure levels at desired locations in the exterior field are then predicted. Predictions were compared with preliminary test data. Also compared is a simulation of the same system using a Helmholtz equation solver, but without taking into account the average fluid flow.