Speaker
Description
The CPX method is a standard method for assessing the acoustic properties of road surfaces. The reference tyres to be used with this method are specified in ISO/TS 11819-3. The H1 tyre (AVON AV4) mentioned therein, which is used to characterize the tyre/road noise of trucks, has been discontinued since the end of 2014. This makes it necessary to find a suitable replacement for AVON AV4.With project funding from the German Federal Ministry of Transport (BMV) and with the support of the German Federal Highway and Transport Research Institute (BASt), a consortium of all providers of CPX measurements in Germany has worked on project FE 04.0340/2021/AGB "Methodology for the selection of a new H tyre for the CPX process" and proposed a new H tyre (hereinafter: H2 candidate). For this H2 candidate, the correction coefficients for air temperature and shore hardness were determined, as well as a formula for converting results with the reference tyre H1 and the H2 candidate. In addition, the procedure used in this project has been described in a manual as a guideline for the future choice of new reference tyres.