Localisation of non stationary or moving sources can be performed using Real-Time Nearfield Acoustic Holography (RT-NAH). This technique consists in reconstructing the acoustic fields using a time domain description of the problem. In this paper, a 110 microphone array is used to study the characteristics of the method: firstly, in terms of SNR, it is possible to localise correctly sources beyond a threshold of approximately 8dB. Secondly, the method allows us to localise correctly two close sources as long as the distance between them is greater than an array step. In the case of a smaller distance, two sources are found but not at the exact real positions. Finally, the study of moving sources in a reference case (moving speakers) shows that sources are correctly localised during the motion. Moreover in a real car equipment case (rear wiper noise), a source is localised on the wiper in the forward motion but not in the backward one.
Characterisation of car equipments by real-time nearfield acoustic holography
2010
7 Seiten, 12 Bilder, 9 Quellen
Conference paper
Storage medium
English
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