The tire cavity accoustic mode leads to audible noise inside the vehicle interior. Due to the continuous reduction of the overall driving noise, tire cavity noise has become more important for car manufacturers. To investigate different influencing factors, measurements on a driving car were performed. Several parameters were varied and the influence on the cavity noise was analyzed. The influencing factors known from literature could be confirmed: e.g. the Doppler-effect could be identified (frequency split) as well as the frequency shift due to temperature change. Furthermore, new questions were brought up, e.g. the influence of pressure is still an open question: A frequency shift was observed only for the low frequency peak wereas the high frequency peak remains at the same frequency. In addition, different propopsals to reduce the cavity mode amplitude are analyzed and evaluated. Despite the different physical mechanisms all the optimization measures show good effecticity. The sound pressure level (SPL) reduction at low driving speeds in the vehicle interior is up to 8 dB(A) in the frequency range of the cavity mode. The measurements show the big influence of the operating conditions on the cavity resonance. Especially the influence of the tire inflation pressure should be investigated further to understand the physical effects in the tire cavity. The evaluation of three different optimization measures show a good effectiveness of all the systems. But the open questions concerning mounting, durability and possible conflicts with other important properties of the tire (e.g. high speed uniformity) have to be answered before the systems will be ready to use in the serial production of passenger cars.
Cavity noise of passenger car tires - influencing factors and optimization measures
Hohlraumgeräusch von PKW-Reifen - Einflussfaktoren und Optimierungsmaßnahmen
2010
17 Seiten, 12 Bilder, 1 Tabelle, 19 Quellen
Aufsatz (Konferenz)
Englisch
Cavity noise of passenger car tires influencing factors and optimization measures
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