Browse Publications Technical Papers 2023-01-1090

Beamforming Quantification of Acoustic Transmission Paths for Passenger Vehicles using a Reciprocal Approach 2023-01-1090

This paper presents an experimental method for measuring transmission paths from the exterior to the interior of a passenger vehicle. A reciprocal approach was used: A production vehicle was placed in a semi-anechoic environment, artificial noise sources were placed at the location of the occupant’s ear(s) inside the vehicle and beamforming arrays with a total of more than 300 microphones were used to observe apparent noise sources on the vehicle exterior resulting from transmission paths. This makes it possible to quickly measure transmission paths over the whole vehicle body. One of the motivations for this work is the monitoring of sealing quality on production vehicles. Artificial seal breaches were introduced on the vehicle and the method was able to detect and localise these. Another motivation for the work would be providing a quantitative spatial filter to use with beamforming measurements of aerodynamic noise on a vehicle exterior. Aerodynamic form noise on a vehicle tends to be determined by decisions made early in the development process. It is possible to make exterior beamforming measurements of aerodynamic noise sources on an aerobuck (often in parallel to aerodynamic measurements) relatively early in a development programme, however these sources must be interpreted in the context of their relative transmission paths to the interior. It is proposed that this technique could be used here in order to better quantify the relative importance of different exterior sources and this application is investigated using exterior beamforming measurements in a wind tunnel as part of this work.


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