Abstract
Heavy drawbar work on cultivated soil is the most critical aspect for agricultural tractors after the impairment of efficiency resulting from wheel slippage. To investigate this aspect with specific reference to cultivated soils, the data of 100 tractors of varying engine power and weight were processed to obtain a regression equation as the starting point to analyze driveline efficiency, power loss due to rolling resistance, and wheel slippage. To fit the results to soil conditions, four tractors of different mass fitted with agricultural tires of varying size and pressure settings were tested in field conditions to correlate drawbar force with wheel slippage. The algorithm obtained was introduced in the regression equation with the aim to obtain simplified algorithm for the assessment of the optimal wheel-slip value during drawbar works that enables optimal fuel consumption with minimum tractor efficiency impairment. According to the results, in case of heavy drawbar work, keeping the wheel slippage below 10% and running the tractor at low forward speeds results in greater tractor efficiency. This underlines the importance of the motion resistance of tires on the agricultural soil and the role that the proper evaluation of the drawbar force of tires plays, even at low levels of wheel slippage.
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Acknowledgements
This work was supported by the Italian Ministry of Agriculture (MiPAAF) under the AGROENER project (D.D. no. 26329, 1 April 2016)—http://agroener.crea.gov.it/.
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Cutini, M., Brambilla, M., Bisaglia, C., Pochi, D., Fanigliulo, R. (2020). Efficiency of Tractor Drawbar Power Taking into Account Soil-Tire Slippage. In: Coppola, A., Di Renzo, G., Altieri, G., D'Antonio, P. (eds) Innovative Biosystems Engineering for Sustainable Agriculture, Forestry and Food Production. MID-TERM AIIA 2019. Lecture Notes in Civil Engineering, vol 67. Springer, Cham. https://doi.org/10.1007/978-3-030-39299-4_46
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