Rational suspension system damping to ensure the vehicle stability during high-speed maneuvering

Abstract

Introduction. Modern semi-active suspension systems should be as efficient as possible in order to realize the maximum of their regulatory physical capabilities. At the same time, the increase of operating speeds and the traditional separate presentation of disturbing influences can lead to constructive and control errors. The purpose of the study was to determine the rational damping parameters under the simultaneous effects of kinematic and force perturbations (combined perturbation) on the vehicle body. Methodology and research methods. The task was solved by the operational calculus methods for a quarter of a vehicle model. Scientific novelty and results. In semi-active systems, the control of damping elements was noted to correspond to a change in the shock absorbers drag coefficient (or relative to attenuation coefficient). Therefore, it was necessary to evaluate the effect of this parameter change on the amplitude-frequency characteristics, which in the course of solving the set task turned into amplitude-frequency surfaces (AFS). The article also provided the results obtained in the course of amendments made for the quarter of AFS model. AFSs were proposed to be respectively divided into kinematic zones and force perturbations areas. The practical significance lies in identifying the effect of perturbation and attenuation coefficient (drag coefficient) force on the smoothness and motion safety indicators of the vehicle’s “quarter” model. At the same time, a priori knowledge of the perturbation characteristics was required for a rational choice of the attenuation coefficient for each of the combined AFS areas. The influence of the natural frequency value on the AFS type, and, consequently, the choice of the attenuation coefficient, was also noted. When conducting further research, it is necessary to solve the optimization problem for a number of combined areas of AFS.