Theoretical background of experimental methods for studying the influence of technical conditions of shock absorbers on lateral tire reactions

Abstract

The article studies the technical condition of shock absorbers which influences the occurrence of lateral reactions when the vehicle is passing through a single irregularity under the influence of lateral forces. The lateral reactions determine the properties of the directional and trajectory stability of the car. These properties allow us to consider lateral reactions as diagnostic parameters for the method of operational control of the technical condition of the suspension according to the stability criteria of the car. A mathematical model developed by the authors was applied. The model is based on the dynamics equations of the sprung and non-sprung masses, taking into account the technical condition of the shock absorbers. To describe the longitudinal and lateral reactions, the normalized slip function is used. The process of car movement around a circle was simulated with various parameters of the technical condition of the shock absorbers. Simulation results were processed using approximation and correlation analysis methods. The dependences of changes in the maximum value of lateral reactions on each wheel depending on the technical condition of shock absorbers were obtained. The presence of a strong correlation between the magnitude of the lateral reaction and the technical condition of its own shock absorber is established. Changing the technical condition of improper shock absorbers to a lesser extent affects the lateral reaction, but at the same time reduces the quality of diagnosis. Foundations of the method for conducting a road experiment were developed.