Comparison of different zero-slip definitions and a proposal to standardize tire traction performance

The traction properties of agricultural tires are of special importance because the tractive efficiency varies in a wide range to a maximum in the order of 75%. Different single wheel testing equipment is used to investigate tire performance and different mathematical methods are used to process the measured data. The different zero-slip definitions complicate a comparison between the measured data. In the paper the consequences of these differences are shown. For traction prediction it is necessary to make different measured and calculated data comparable so that all these data can be used for modelling tire behaviour. Therefore in this paper an effort to standardize tire traction performance is made.