Spherical beamforming was used to visualize sound radiation during a vehicle passby test. Forward and backward propagation procedures are compared in terms of computational expense. A spherical spreading correction factor is described, along with a maximum liklihood procedure for obtaining an optimal array weighting dependent on the relative distance between the microphones and the focus point. The de-Dopplerized microphone outputs are multiplied by the weighting factors and summed to yield the source strengths over a reconstruction plane “attached” to the vehicle. Results obtained using a 16 element sparse array during an actual passby are used to demonstrate the present approach.
An Efficient Procedure for Visualizing the Sound Field Radiated by Vehicles During Standardized Passby Tests
Sae Technical Papers
Noise & Vibration Conference & Exposition ; 1999
1999-05-17
Aufsatz (Konferenz)
Englisch
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