Road traffic noise is nowadays a major environmental pollutant. In the near future traffic noise will increase even further, especially due to the expected increase of heavy traffic. Noise radiated from tyres of the vehicles is a dominating source. The acoustic field inside the tyre has previously been modelled. The first acoustic mode for a standard stationary passenger car tyre is at 225 Hz. The tyre becomes stiffer at these tyre air cavity resonances and radiates comparatively high tonal noise to the exterior at this frequency range. In order to reduce this tonal noise at low frequencies a set of new modified wheels are developed implementing some sound absorbing material inside the tyre. Preliminary sound intensity measurements have been carried out on a static tyre. The influence of the tyre air cavity resonances on the radiated noise is reduced adding sound absorbing material inside the tyre. The measurements on stationary tyres indicate that the noise radiated by a tyre could be reduced in a wide frequency range by adding some sound absorbing material inside the air cavity. The noise of a standard car tyre could be reduced by up to 5 dB in the frequency range up to 2 kHz. Furthermore, the noise of a standard tyre of a moving truck could be reduced by at least 2 to 5 dB in the frequency range below 1 kHz.
Tyre air cavity influence on tyre-road noise
Einfluss des Lufthohlraumes in Fahrzeugreifen auf das Reifen-Straße-Geräusch
2005
8 Seiten, 6 Bilder, 3 Quellen
Conference paper
Storage medium
English