GAR | GRB-59-05/Rev.1

Document Number GRB-59-05/Rev.1

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Document title	Influence of road surface on tyre rolling sound emissions (revised)
Date	29 Jan 2014			Overview of the NordTyre Project to investigate the noise performance of passenger car tyres on typical road surfaces in Norway, Sweden and Denmark and to clarify which combinations of road surfaces and tyres yield the lowest tyre/road noise levels.
Source(s)	SINTEF
Status
Rulemaking area(s)	UN R117 Tire Noise, Wet Adhesion, and Rolling Resistance
Meeting(s)	GRB \| Session 59 \| 28-30 Jan 2014 Agenda item 9. Influence of road surface on tyre rolling sound emissions
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Excerpts from session reports related to this document
GRB \| Session 59 \| 28-30 Jan 2014			24. GRB welcomed a presentation by the expert from the Foundation for Scientific and Industrial Research (SINTEF, Norway) outlining the first results of a study concerning the influence of the road surface on tyre rolling sound emission. The expert from SINTEF clarified that the main objective of the project was to investigate the noise performance of normal passenger car tyres on typical road surfaces in the Nordic countries (Denmark, Norway and Sweden) and to clarify which combinations of road surfaces and tyres will yield the lowest tyre/road noise levels. GRB noted that the results of this investigation had demonstrated the variation in noise levels of tyres around 4 dB(A) and the same variation between average of road surfaces. It was also noted that the difference between the most noisy tyre on the most noisy surface and the most quiet tyre on the quietest road surface had been found to be 11 dB(A). Finally, the expert from SINTEF informed GRB that during 2014, the project would be extended to truck tyres.