Tyre/road noise measurements on ISO tracks according to the UNECE Regulation 117

Abstract

Within the Polish-Norwegian research project ELANORE, a limited Round Robin Test has been performed on 3 ISO tracks in Northern Europe. The basic objective of the project is to improve the EU directive on labelling of tyres for noise and rolling resistance. This directive is based on the measurement procedures proscribed in the UNECE Reg.117. On all test tracks the same car, test tyres and test equipment as well as personnel were used to minimize the measurement uncertainties. All tracks were built according to the specifications of ISO 10844:2014. Five sets of C1 test tyres were used which consisted of two summer tyres, one all-season, one winter and one set of the SRTT tyres. Except for the SRTT tyres, the other 4 had labelled noise values from 67 to 74 dB. In addition to the test conditions specified in Reg.117, a modified test was also included, where the load and inflation pressure were adjusted to better fit the test vehicle specification. Due to some adverse weather conditions at two of the test tracks, only a part of the test program was accomplished. The paper will present preliminary results from these measurements. A follow-up tests are planned for 2022.