ESTIMATION OF THE INFLUENCE OF «CONSTRUCTIONAL» FRICTION IN SUSPENSION ON SPATIAL VIBRATIONS OF A VEHICLE

In the process of creating and modernizing ground vehicles for various purposes, in particular armored vehicles, there is a problem of assessing the influence of design features on working processes in operating conditions. These features include the presence of "structural" friction, in its manifestations and the effect similar to "dry" friction. In some cases, this leads to the appearance of self-oscillations, which is undesirable. Therefore, the development of the theory and practice of numerical assessment of vehicle performance with the possibility of manifestation of self-oscillating properties is an urgent task. Obviously, in the framework of the methodology of applied optimal design of complex technical systems, it is necessary to have an adequate mathematical model of the object of study. An original mathematical model of free spatial vibrations of the sprung part of the transport machine (body) is proposed, which allows one to evaluate the influence of the features of the new vehicle suspension design. The new suspension is hydropneumatic, with a helical gear, with the presence of "structural" friction. Calculations carried out numerically using the original program confirmed the correspondence of the mathematical model to modern ideas about the theory and practice of work processes with free vibrations of complex technical systems. The motion parameters during the manifestation of self-oscillating properties and parametric vibrations of an object close in weight and size to the BTR70 and BTR80 are numerically estimated.