A study of the longitudinal slip and side slip of a wheeled tractor under variable vertical load Online publication date: Tue, 18-Jun-2013
by R.G. Russev, D.T. Nhu, T.I. Todorov, I.L. Petrov
International Journal of Heavy Vehicle Systems (IJHVS), Vol. 2, No. 3/4, 1995
Abstract: This paper describes a theoretical and experimental study of an agricultural tractor subject to harmonic excitations, and the effects of such a road input on the tractive performance and the lateral stability of a tractor. The tractor is represented by a two-degree-of-freedom model for evaluation of the vertical displacement of the wheels. Two nonlinear models are used to describe the longitudinal wheelslip and side slip angles. A hydraulic driven exciter mounted on the rear part of the tractor is used to simulate the harmonic input. Under these conditions a tractor fitted with pneumatic tyres was tested and the vibrations of the wheel and wheelslip were measured. It is shown that the variable normal road reaction exerts a negative effect on the tractive performances of the tractor, and that this should be taken into account when predicting and analysing the dynamic characteristics of the tractors.
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