Investigation and Evaluation of Rolling Resistance Prediction Models for Pneumatic Tires of Agricultural Vehicles

Wheel numeric and different versions of mobility numbers are important models for predicting the rolling resistance. In this study, data related to the rolling resistance of cross ply and radial ply tires were compared with the resultant values from several models. Also, the preciseness of models in rolling resistance prediction was evaluated. For this purpose F test and 1-1 line method (p≥ 0.05) were used. According to the results of the evaluation, Cn and Bn models overestimated the rolling resistance for both cross ply and radial ply tires, but the slope of these models did not show any significant difference compared to 1-1 lines. Results indicated that these models had better prediction if an adjusting coefficient could be applied. The EMOB model showed better results compared to Cn and Bn models for cross ply tires, whereas it did not have acceptable predictions for radial tires. The N.I.A.E., FMOB and Dwyer models did not act well for any tire type, even though the best fit line of the Dwyer model did not show any significant difference with the 1-1 line for cross ply tires.