Blacksburg, VA, United States
Blacksburg, VA, United States

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Chan B.J.,Navistar | Sandu C.,Advanced Vehicle Dynamics Laboratory
International Journal of Vehicle Systems Modelling and Testing | Year: 2014

The research conducted in this study deals with the development of a simplified brush-based tyre model for on-road simulation, together with a simplified off-road wheel/tyre model. The on-road tyre model is developed based on data collected by NHTSA throughout the years, while the off-road tyre model is developed based on observations of experimental data and photographic evidence collected by various terramechanics researchers within the last few decades. The principle behind the model revolves around the integration of the stresses at the contact interface and has its basis in terramechanics. The model was parameterised from test data to acquire static and dynamic friction coefficients, cornering and longitudinal stiffness, as well as camber stiffness. The results are compared with test data and show good correlation. This paper is the first of a series of three papers on the modelling tyres for both on- and off-road operations. Copyright © 2014 Inderscience Enterprises Ltd.


Chan B.J.,Navistar | Corina Sandu C.,Advanced Vehicle Dynamics Laboratory
International Journal of Vehicle Systems Modelling and Testing | Year: 2014

A simplified tyre model has to account for two things for off-road vehicle dynamics simulations, the soil deformation and the tyre deformation. A trade-off between both these deformations will determine the contact geometry and consequently the contact pressure. This study presents the extension of a simplified tyre brush-based tyre model for on-road simulation to a simplified off-road wheel/tyre model that has the capability to revert back to on-road trend of behaviour on firmer terrain. The tyre model is developed based on observations of experimental data and photographic evidence collected by various terramechanics researchers within the last few decades. The outcome of this work shows results that show acceptable qualitative trends, consistent with the general observations from experimental data collected by various terramechanics researchers throughout the years. This study represents part three of the series where a flexible tyre on deformable terrain is implemented and output of the model is computed for a very firm and cohesive Yolo loam terrain to represent a condition where the soil exerts pressure on the tyre that exceeds the deformation modulus of the tyre. © 2014 Inderscience Enterprises Ltd.

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