Eliminationof parametric resonance oscillations in the high-speed tracked vehicle propulsion system

Abstract

"Research and/or Engineering Questions/Objective The modern conditions for high-speed tracked vehicle exploitation are characterized by fast frequent changes in the environment. In these conditions, the level of requirements for reliability of tracked vehicle mechanisms and systems, which ensure its mobility, increases. Of particular importance is the trouble-free operation of the tracked vehicle propulsion system, which interacts with a multi-parameter environment and is subject to the highest dynamic loads. One of the elements limiting durability of the propulsionsystem is road wheel tires, durability of which is largely determined by their thermal stress. Their prolonged exposure to high temperatures during vehicle runs at maximum speed leads to an intense accumulation of irreversible structural changes (degradation) in solid rubber tires, deterioration of the elastic and strength properties of the material and thermal destruction. Tire heating occurs due to generation of heat due to internal friction during deformation process. The tire temperature value depends on driving conditions of the vehicle, a type of soil, an ambient temperature and design parameters, as well as on physical and mechanical properties of the tire materials and the caterpillartread, a heat transfer area, etc. The article discusses the interaction of the caterpillar track with various types of support base and its influence on the formation of dynamic loads in the structural elements of tracked vehicleautomotive components. The rationale is given for the need to study the interaction between the road wheel tires and the rubber-facedcaterpillar tread while moving along a hard surface, when a periodic change in the stiffness of the elastic interaction leads to parametric resonance excitation. Methodology To study the complex interaction of the road roller tire with a rubber-faced tread, the methods of nonlinear dynamic systems analysis are applied. Results On the basis of the theory of nonlinear elastic interaction, the stability areas of parametric oscillations are determined, the value of the modulation depth of the elastic interaction stiffness is substantiated, which ensures the elimination of parametric resonances. The validation results of the mathematical model under development are presented, and the technical solution options are proposed to ensure the elimination of parametric resonance. What does the paper offer that is new in the field including in comparison to other work by the authors? The scientific novelty of the methods (techniques) and technical solutions proposed in the project lies in the development of a method for stabilizing parametric oscillations in a nonlinear system based on investigatinganunderstudied phenomenon of the parametric resonant oscillationoccurrence in the propulsion system of high-speed tracked vehicles. Conclusions According to the results of the study, the elastic interaction of the road roller tire with the rubber-faced caterpillar tread was optimized, which makes it possible to reduce the likelihood of excitation of parametric resonant oscillations and high-frequency loading of the road wheels, reduce the tire temperature and increase the durability of the chassis elements. The engineering proposal makes it possible to stabilize the stiffness modulation depth parameter along the length of the track."