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Simplified analysis of the steady-state turning of complex vehicles

In: Vehicle System Dynamics, Vol. 29, No. 3, Mar. 1998, p. 141-180; DOI: 10.1080/00423119808969371

Authors: C. B. Winkler

The classic analysis of the steady-state turning of the motor vehicle is based on a simple vehicle model in which lateral acceleration is the only motion variable that affects tire slip angles. This paper examines a more complex vehicle whose slip angles depend on lateral acceleration plus another motion variable. Trucks with multiple, nonsteering rear axles are one example of the complex vehicle. A general analysis of the complex vehicle together with analyses of linear and nonlinear trucks provide new insights into the understeer/oversteer quality of all vehicles. It is shown that a complex vehicle can be represented as a simple vehicle with an equivalent wheelbase. A physical interpretation of equivalent wheelbase for trucks and a method for its measurement are presented.