Khoroshun R. Substantiation of Parameters of Adaptive Suspensions for Light-Duty Wheeled Vehicles

This dissertation presents a theoretical generalization of the scientific and practical problem of developing a methodology for creating suspension designs for light-duty vehicles that, unlike existing ones, ensure enhanced performance in ride comfort, handling, and driving stability. Improvement of ride smoothness indicators in wheeled vehicles can be achieved by enhancing the suspension system based on an in-depth study of the vibration processes of vehicle components during their design, research, and operation. For the design of such controlled suspension systems – or more precisely, for the creation of software products that manage the critical force parameters of the suspension system – a significant challenge remains the lack of information about the response of the sprung mass to changes in the magnitude of these force parameters and various types of external disturbances caused by the vehicle’s movement. Based on a systematic approach to investigating the parameters of adaptive suspensions in light-duty wheeled vehicles, the following scientific results have been obtained in this work: - for the first time, the patterns of how the main kinematic parameters of adaptive suspensions and external factors influence the amplitude-frequency characteristics of longitudinal-angular, lateral-angular, and vertical oscillations of the vehicle’s sprung mass have been established. This will enable improved controllability, stability, and ride comfort of the vehicle. - for the first time, analytical dependencies have been derived to determine the limit value of the dynamic steering angle of the vehicle’s steered wheels based on the amplitude of longitudinal-angular oscillations and related parameters. These dependencies allow for assessing the impact of the sprung mass’s relative motion on the dynamics of the steered wheels with a nonlinear force characteristic of the suspension system. - an improved mathematical model has been developed to determine the vehicle’s directional stability during the stages of assembly and trajectory selection in the road plane. This model aims to minimize negative dynamic effects and establish safe parameters for transitioning sections from straight-line to curvilinear motion, depending on the vehicle’s speed mode. - analytical studies have been further advanced regarding the influence of kinematic motion parameters and longitudinal-angular oscillations of the sprung mass in wheeled vehicles with a nonlinear force characteristic of the suspension system on their controllability under various operating conditions. The technical novelty of the developments is protected by 3 patents of Ukraine for a useful model. The results of the KTZ study were used in the educational process when training specialists in the specialty 274 "Motor Transport" at the National Transport University, and in the specialty" 133 "Industrial Mechanical Engineering - at the Ivan Pulyuy Ternopil National Technical University. The developed experimental research methodology was used at Bosch Service. Keywords: car, vehicle, suspension, environmental friendliness, power, highway, intersection, oscillations, stability, controllability, steering angle.