Abstract
Tractor tractive performance is traditionally predicted by summing the performance of individual tires. This process requires iteration to determine dynamic load on each tire. A vehicle number, Vn, for all-wheel drive vehicles was calculated from static front and rear mobility numbers and static axle loads as a simplified method of describing tractor and traction surface interaction. Results of predicting the dynamic traction ratio with the Vn and Brixius methods were compared for two tractor chassis types. Three vehicle loads, load distributions, and soil conditions give a total of 27 conditions to evaluate the proposed prediction method for each of the two tractor chassis types. The results indicate that Vn is adequate to predict tractor and traction surface interaction in the situations considered. A method of addressing the differences of two-wheel drive tractors and limits of applicability will need to be developed.
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