Close Proximity (CPX) Round Robin Test 2017
* Presenting author
Reduction of traffic noise is of great benefit to society. Therefore, silent tyres and silent pavements have been developed and are continuously improved. To measure the performance of silent pavements, measurements of tyre/road noise generated on different pavements are necessary. The Close Proximity (CPX) method, standardized in ISO 11819-2, is widely used as a measurement method for tyre/road noise.In spring 2017 a Close Proximity round robin test (RRT) was conducted in the Netherlands. In total 9 CPX-systems participated in this test. This included CPX-systems from Austria, Belgium, Germany and the Netherlands.In the paper the results of this CPX RRT are presented. The goal of the RRT was to look at the reliability of the measurement results in practice, and to see if the differences between CPX levels measured by different parties and measurement systems are within acceptable margins. Measurements and analysis have been performed according to the Dutch “Protocol for admission and round robin test of CPX devices”. The paper explains the RRT protocol and the results, including repeatability and reproducibility. In addition, attention will be paid to the effect of applying a correction for the influence of rubber hardness on the CPX levels.