Title: Dynamics of log hauling vehicles
Authors: X. Tong, B. Tabarrok, M. El-Gindy
Addresses: Centre for Surface Transportation Technology, National Research Council of Canada, U-89 Alert Road, Ottawa, Ontario K1A OR6, Canada. ' Department of Mechanical Engineering, University of Victoria, British Columbia V8W 3P6, Canada. ' The Pennsylvania Transportation Institute, The Pennsylvania State University, 201 Research Office Building, University Park, PA 16802, USA
Abstract: Dynamic behaviour of various 5,6 7 and 8-axle log hauling vehicles is investigated through computer simulation in this paper. A comprehensive dynamic simulation model is developed and results predicted by the simulation model for a 5-axle tractor/pole trailer (with outriggers) and a 6-axle tractor-jeep/pole trailer (with outriggers) are compared with those measured in field tests for purposes of model validation. The comparison of measured and predicted results shows gratifyingly good agreement. To provide assessments of the design of various configurations of logging trucks when their stability, control and off-tracking are of concern, the developed simulation models are used to examine the following performance measures: rearward amplification ratio, load transfer ratio, transient high-speed off-tracking, understeer coefficient, static rollover threshold and low-speed friction demand.
Keywords: heavy vehicles; vehicle dynamics; logging trucks; performance measures; rollover stability; simulation.
International Journal of Heavy Vehicle Systems, 1998 Vol.5 No.1, pp.69 - 94
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