Masoud GHARIBKHANI

A Mathematical Model for Determining Rolling Resistance of Agricultural Tire to Control Energy Losses

One of the most important performance parameter of the towed pneumatic wheel is therolling resistance, which is influenced by tire design, temperature, soil conditions and etc. Therolling resistance of tires is one of the major sources of energy losses of any moving vehicle andaccordingly vehicle fuel consumption. In this research we tried to determine the rolling resistanceof transport type agricultural tire on firm soil terrain roads. The tire was tested at different levels ofinflation pressure (34.5 to 207 kPa), normal load (0.981 to 4.905 kN) and forward speed (3 to 7km/h). These tests were conducted on firm clay loam soil in a soil bin by means of single wheeltester having single tire test carriage with four-bar parallel linkages. Different combination ofvertical loads, inflation pressures and forward speeds were considered to observe the respond ofrolling resistance toward these combinations. Effects of these factors on rolling resistance wereanalyzed separately and also the interaction of the factors was acquired and finally a mathematicalmodel was developed to predict the rolling resistance of tire. The mathematical model was able topredict the rolling resistance under this test condition in an acceptable manner and it showed thatsuch models would be used as useful tools for assessment of tire efficiency before choosing for anyspecific use.

Anahtar Kelimeler:

single wheel tester, energy losses, mathematical model

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