Correlation of parallel car interior and exterior beamforming measurements in a wind tunnel

摘要

In aeroacoustics, beamforming measurements have become a standard tool for sound source localization. Additionally, correlation methods are applied to determine the contributions of local wind noise to the measurement. We present a series of synchronized measurements of a car in a wind tunnel, all of them using two beamforming arrays at the same time. One is placed outside the wind stream near the shear layer while the other array is located inside the car's cabin. This setup enables us to localize wind noise transmission into the car's cabin. In the next step, leaks will be ranked by their exterior origins, e.g. side mirror, wheel house etc. by correlating interior and exterior acoustic images. In contrast to this method, we additionally used measurement microphones as reference channels, which is the classic approach up to now. The paper will compare those two methods.