Rolling Resistance of Off‐Road Vehicles
Publication: Journal of Construction Engineering and Management
Volume 114, Issue 3
Abstract
The rolling resistance (RR) of vehicles operating off‐road is, despite its significance, an uncertain factor in haul‐time and productivity estimates. The rule‐of‐thumb formula used for estimating the RR consistently underestimates the RR of free‐rolling (nondriven) tires. The RR of driven tires is shown to vary considerably with the applied torque; at high torque (in low gears) it may be several times greater than the RR of free‐rolling tires. This increase of the RR may result in a decrease in productivity, or at worst, in the immobilization of off‐road vehicles. The use of an analytical tire‐soil interaction model is a rational method of estimating the RR of both free‐rolling and driven tires and, by summation, the total RR of wheeled off‐road vehicles. Performance data sets consisting of rimpull and RR values for various values of slip, obtained from this model, present a realistic simulation of the interaction between vehicle and soil. Their use in conjunction with rimpull‐speed relations supplied by manufacturers improves haul‐time calculations and allows the performance of unbiased comparative analyses of various candidate vehicles for a variety of routing and soil conditions.
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Information & Authors
Information
Published In
Journal of Construction Engineering and Management
Volume 114 • Issue 3 • March 1988
Pages: 458 - 471
Copyright
Copyright © 1988 ASCE.
History
Published online: Mar 1, 1988
Published in print: Mar 1988
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