Determination of wheel-soil rolling resistance of agricultural tire

So far many researchers have tried both theoretically and practically to define tire rolling resistance. In this research, two predicting models of tire rolling resistance were evaluated and compared. Bekker model and one of the Waterways Experimentation Station method models were selected as predicting models. Using a single wheel tester, some experimental tests on a controlled soil bin filled with clay loam soil, were performed to validate the selected models' rolling resistance accuracy. Decision tree was used to predict the effect of tire inflation pressure and vertical load on rolling resistance. A towed tire was tested at different levels of inflation pressure (34.5 to 207 kPa) and normal load (0.981 to 4.905 kN). Effects of these factors on rolling resistant were analysed. The models related to WES-method, offers a great number of different models which are applicable for typical soil-tire systems. Wismer and Luth model (as a WES model) showed the better result for rolling resistance prediction. Bekker model (as a semi- analytical model) was unmeet for predicting the rolling resistance. The accuracy of decision tree was 97% for predicting these parameters' effect on rolling resistance. So, the decision tree appeared to be a good method for fast and accurate prediction of rolling resistance.

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