Title: Development of a 3-D quasi-steady-state tyre model for on-road and off-road vehicle dynamics simulations: Part II - off-road rigid wheel model

Authors: Brendan J. Chan; Corina Sandu

Addresses: Navistar, Inc., 4-3-P07-4, 2601 Navistar Dr., Lisle, IL 60532, USA ' Advanced Vehicle Dynamics Lab., 104 Randolph Hall 460 Old Turner Street, Blacksburg, VA 24061, USA

Abstract: This study presents the development of a simplified brush-based tyre model for on-road simulation, together with a simplified off-road wheel/tyre model that has the capability to revert back to on-road trend of behaviour on firmer soils. The on-road tyre model is developed based on empirical data collected by NHSTA, 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. Using theoretical analysis and empirical data, the tyre deformation geometry is determined to establish the tractive forces in off-road operation. The first step of any off-road vehicle is to model the condition where the soil is much more deformable than the tyre, where the tyre can be modelled as a rigid wheel. This study explores the development of the rigid wheel mode of the model, using dry sandy terrain, an example of extremely deformable soil. This paper is the second of three papers on the modelling of tyres for both on and off-road operations.

Keywords: off-road tyre model; soil deformation; 3-D modelling; quasi-static tyre models; flexible tyre modelling; vehicle dynamics; simulation; vehicle tyres; rigid wheel model.

DOI: 10.1504/IJVSMT.2014.061427

International Journal of Vehicle Systems Modelling and Testing, 2014 Vol.9 No.2, pp.107 - 136

Received: 17 Dec 2012
Accepted: 04 Sep 2013

Published online: 30 Jun 2014 *

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