The development of always quieter vehicles is underlying the present study. The noise level, initially dominated by engine and flow noise, was further reduced and optimized over the years. This has the consequence that other, previously insignificant components, come acoustically to the fore. Their damping and attenuation plays an important role in the modern automotive industry. Many aspects of the interaction between tire and road surface is already examined in this context. Rolling noise is transmitted both by structure-borne sound and airborne noise inside the cabin. A new aspect, which is focused in the present case, is the question which impact is resulting from the functional community of tire and rim and the cavity enclosed in it. A complete set of tires was produced for the measurements and tested under realistic driving conditions on the four-wheel roller test bench. Two timely measurements are made to ensure an objective comparison. One measurement is performed employing a similar wheel without absorber and the second using the modified wheel with an integrated tire-absorber. The results thus obtained can be compared with each other and a level difference at the tuned frequency range of the absorber directly shows its absorbing effect. The measurements were taken with a dummy head at a passenger seat and at different speeds. As an example, the result of a measurement with a speed of 90 km/h is shown. In this measurement, the engine of the vehicle was turned off and the vehicle was driven by the rollers at a speed of 90 km/h. For the series rim, an increase of sound pressure level due to the cavity mode is visible in the range of 200 Hz. Compared with the tire-absorber, a significant reduction in this frequency range is obtained. With the application of the microperforated tire-absorber a level reduction of 5 dB has been achieved on the roller test bench as well as on the street.


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    Titel :

    Microperforated absorber to reduce the tire cavity mode


    Beteiligte:


    Erscheinungsdatum :

    2012


    Format / Umfang :

    14 Seiten, 14 Bilder, 5 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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