An analysis on the rolling characteristics between tire and dynamometer drum

In this paper, the drum and flat-belt models for tire rolling resistance measurement are set up and the characteristics of contact between tire and dynamometer drum with different sizes are analyzed. Then a measurement/simulation of tire rolling resistance is conducted with a scheme, in which the reaction forces of wheel shaft are calculated based on the stain data of sensors and are then transformed into tire rolling resistance. Finally a rig test of tire rolling resistance is carried out. The results of static loading show that the vertical deflection of tire reduces with the increase of drum diameter, but the tendency weakens when the drum diameter is larger than 2m. The results of steady state measurement/simulation indicate that the tire rolling resistance slightly goes up with the increase in wheel speed, and rises with increased loading almost proportionally, but lowers with the rise in tire inflation pressure. The above tendency agrees well with test results. Under all three conditions with the changes in speed, loading and inflection pressure, the tire rolling resistance reduces with the increase in drum size.