Tire-road noise measurements at the test rig of BASt
* Presenting author
The primary source of traffic noise at common road speeds is tire-road noise. Different standards are in use for the noise measurements. In Europe, measurements are taken by the close-proximity method (CPX), while the on-board sound intensity method (OBSI) is used in the USA. Moreover, in Austria another standard RVS 11.066 is used. The measurements are typically done outside, resulting in restrictions due to ambient conditions. To overcome such limitations the Bundesanstalt für Straßenwesen (BASt) has developed their own test rig Prüfstand Fahrzeug/Fahrbahn, PFF. This inner drum test rig was built to make in situ acoustic measurements. Due to the stationary wheel, additional measurement instrumentation can be used. On the other hand, one has to deal with some limitations. The inherent noise of the PFF, sound reflections and the influence of the different curvature between tire and the road surface can probably lead to deviations compared to outdoor measurements. Another big issue is the realistic road surface in the test rig. To investigate the properties of the drum test rig of BASt, extensive measurements have been performed and the results will be presented within the talk.