Acoustic beamforming was used to visualize the sound radiation of trucks under test track passby and actual highway operating conditions. The purpose of these measurements was to obtain an understanding of which sources contribute to the overall passby noise level and to determine the vertical distribution of noise sources. For trucks, drive axle tires were found to be the major contributor to passby noise at highway speeds, followed by powertrain noise to a much less degree, and very occasionally, exhaust stack outlet noise. For medium and heavy trucks, the acoustic mean source height was found to be about 0.5m and about 0.3m for light vehicles.
Localization of Truck Noise Sources under Passby Conditions Using Acoustic Beamforming Methods
Sae Int. J. Commer. Veh
SAE 2009 Noise and Vibration Conference and Exhibition ; 2009
Sae International Journal of Commercial Vehicles ; 2 , 1 ; 128-137
2009-05-19
10 pages
Aufsatz (Konferenz)
Englisch
Trucks , Radiation , Acoustics , Noise , Test facilities
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