Aspects of Dynamic Modelling of Motor Vehicles with Emphasis on the Influence of the Nonlinear Character of Elastic Forces in Tyres

Résumé

The study of oscillatory motions in vehicles is of particular interest from the perspective of improving their dynamic performance. This aspect has been highlighted in the present work by emphasizing the scientific interest that has been identified in the specialized literature, with several representative studies brought to the forefront. The study proceeds with the presentation of a four-degree-offreedom dynamic model capable of characterizing the oscillatory regime of a vehicle when passing over an obstacle. Based on this dynamic model, the kinematic parameters of the oscillatory motion of a vehicle as it passes over an obstacle were investigated, highlighting the influence of the nonlinear nature of the elastic forces in the tires on these parameters. The conclusions of the study indicate that accounting for the nonlinear characteristics of the tire elastic forces is necessary to achieve a more realistic characterization of the dynamic behavior of the analysed phenomenon; however, for the numerical values considered, the amplitudes of the displacements and velocities of the analysed masses do not differ significantly from those predicted by the linear model.