Influence of Shock Absorber Properties on Tire Lateral Force

The article examines how the damping properties of the suspension system of a vehicle affect the process of forming a lateral reaction in the contact patch of a tire and the supporting surface. A mathematical model of a car quarter, a tire stretched string model, and a road surface microprofile generator were used in the study. The dependences of normal and lateral reactions along the distance traveled for three classes of roads were obtained with a change in the parameter characterizing the damping properties of the vehicle suspension. Mathematical statistics methods were used to analyze the dependences. It was found that the average value of the normal load changes little with a decrease in the damping properties of the suspension, while the standard deviation increases. The average value of the lateral force is reduced by 22%, with the standard deviation increasing by 1.6 times. The use of the Kolmogorov-Smirnov criterion for the analysis of implementations of lateral forces makes it possible to determine the permissible range of nominal values of the parameters of the technical condition of vehicle suspension shock absorbers.

Purpose. Obtaining and analyzing patterns that describe the change in the lateral reaction of a car tire when it moves under the action of a lateral force and suspension vibrations, as well as when changing the damping properties of a shock absorber.

Methodology. In the article were used the methods of mathematical modeling and also statistical methods of the analysis.

Results. Dependences have been obtained that characterize the influence of the damping properties of the suspension on the magnitude of the lateral reaction when the wheel moves along a road with bumps and under the action of a lateral force.

Practical implications. It is expedient to apply the received results by the organizations and institutions involved in the development of methods and means of diagnosing vehicles.