A new procedure for separating partial fields using multi-reference nearfield acoustic noise holography has been developed and applied to tire noise. Sources coherent only with the leading edge, trailing edge, or sidewall, as well as jointly coherent with two or three reference signals, were investigated for a single tire rolling at 56 km/hr on a smooth asphalt pavement. Matching the individual partial fields with probable mechanisms, dominant mechanisms of tire noise were identified. Leading edge noise source dominated for frequencies between 1000 Hz and 2000 Hz, probably due to tread element impact. For frequencies below 1000 Hz, vibration at the lower sidewall region dominated. The likely source of this noise is vibration from tread impact.
Separation of leading edge, trailing edge, and sidewall noise sources from rolling tires
1998
6 Seiten, 9 Quellen
Aufsatz (Konferenz)
Englisch
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