The mechanism of sound radiation by vibration of a tire surface is investigated. The effects on sound radiation of acoustically slow structural waves, boundary conditions, and structural damping are reviewed. Simple vibration sound models are shown inadequate to predict the experimentally measured sound field. A correlation between tire vibration and sound is demonstrated by experiments that relate tire surface vibration levels to levels of near-field and far-field sound. Further evidence of correlation is shown by the cpherence function computed between experimentally measured tire vibration and sound. The tire vibration field is described from analysis of in-service acceleration data telemetered from the sidewall and tread surface regions. A sound radiation model is formulated based on evaluation of the Rayleigh integral for a damped semi-infinite surface vibrating below acoustic coincidence. Sound pressure spectra predicted by the model agree closely with measured spectra for frequencies below 1800 Hz. Experimental procedures and data analysis techniques are described in an appendix. (Kursetz)
An experimental and analytifcal investigation of the vibration noise generation mechanism in truck tires
Eine experimentelle und analytische Untersuchung der Entstehung von Vibrationsgeraeuschen bei Fahrzeugreifen
US Government Reports ; Mar ; 1-159
1981
159 Seiten
Report
Englisch
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