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.


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    Titel :

    An Efficient Procedure for Visualizing the Sound Field Radiated by Vehicles During Standardized Passby Tests


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Moebs, G. B. (Autor:in) / Kook, H. (Autor:in) / Bolton, J. S. (Autor:in) / Davies, P. (Autor:in)

    Kongress:

    Noise & Vibration Conference & Exposition ; 1999



    Erscheinungsdatum :

    1999-05-17




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch







    Passby Sound Level Variability of Automobile Tires

    Richards, Michael G. | SAE Technical Papers | 1976


    Estimation of Component Noise from Vehicle Passby Tests

    Wilkinson, E. / ENEA; Agency: Italy | British Library Conference Proceedings | 1994