The Improvement of a Traction Model for Agricultural Tire–Soil Interaction

Radu Roşca (), Petru Cârlescu, Ioan Ţenu, Virgil Vlahidis and Cătălin Perşu
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Radu Roşca: Faculty of Agriculture, Iaşi University of Life Sciences, 700490 Iaşi, Romania
Petru Cârlescu: Faculty of Agriculture, Iaşi University of Life Sciences, 700490 Iaşi, Romania
Ioan Ţenu: Faculty of Agriculture, Iaşi University of Life Sciences, 700490 Iaşi, Romania
Virgil Vlahidis: Faculty of Agriculture, Iaşi University of Life Sciences, 700490 Iaşi, Romania
Cătălin Perşu: The National Institute of Research—Development for Machines and Installations Designed for Agriculture and Food Industry—INMA Bucharest, 013813 Bucharest, Romania

Agriculture, 2022, vol. 12, issue 12, 1-12

Abstract: The goodness-of-fit analysis performed over the results provided by a model presented in a previous paper proved that the theoretical data were very well correlated with the experimental data with regard to the traction force (with Pearson coefficient r 2 over 0.9); however, the model was less accurate in predicting traction efficiency, with r 2 = 0.203. In order improve the model and obtain a better fit between the theoretical and experimental data (especially for the traction efficiency), the model was updated and modified by taking into account the geometry of the tire cross section, which was considered to be a deformable ellipse. Due to the deformable cross section, the minor axis of the tire–ground contact super ellipse decreased compared with the previous model (from 0.367 m to 0.222 m), while the major axis increased (from 0.530 m to 0.534 m). As a result, different data for the traction force and traction efficiency were obtained. The effect of the wheel travel reduction (wheel slip) over the tire–soil shear area was also investigated, and the hypothesis of a constant shear area (independent of wheel slip) provided the most accurate results. The goodness-of-fit analysis performed using the data predicted by the modified model showed that the Pearson coefficient increased significantly with regard to the traction efficiency (from 0.203 to 0.838), while it decreased by only 2.7% with regard to the data for the traction force, still preserving a high value (r 2 = 0.896).

Keywords: tire–soil interaction; super ellipse; shear area; traction force; traction efficiency (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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