The influence of tyre wear and ageing on tyre/road noise emission and rolling resistance

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Klaus-Peter Glaeser
Jerzy A Ejsmont
Gernot Schwalbe

Most published tyre/road noise tests have been made on new or nearly new tyres. Tyre testing with reference to the EU Directive 2001/43/EC or the ECE Regulation 117 is always made on brand new, albeit run-in, tyres. Reference tyres for road surface testing must be in new or almost new condition. Yet, substantially worn tyres are more frequent on our roads and streets than new or almost new tyres. Only a few investigations have addressed the basic problem of how and to what extent tyre wear influences tyre/road noise. It is quite obvious that a tyre in new condition is different from a tyre in old, worn condition. Although the carcass may be essentially unchanged, the tread pattern will look and perform very differently in new and old condition, and the rubber material has changed its properties (e.g. hardness) with tyre storage and due to exposure to sunshine and wear, etc. The primary aim of the experiments was to study how much tyre wear and ageing influence noise emission of tyres running on smooth and rough surfaces. The secondary aim was to study how much tyre wear and ageing affect rolling resistance of tyres run on smooth and on rough surfaces.

Alternative URL: http://www.fehrl.org/index.php?m=32&mode=download&id_file=6134

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