Abstract
In the work, a methodological approach to obtaining mathematical models was further developed, which describe the functioning of tribosystems in stationary and transient modes under boundary lubrication conditions.The structural identification of the tribosystem as an object of modeling the functioning of tribosystems in the conditions of boundary lubrication is performed. It is established that the operation of tribosystems is described by a third-order differential equation and, in contrast to the known ones, takes into account the function of changing the quality factor of the tribosystem during running-in. It is shown that the nature of the functioning of tribosystems under conditions of ultimate lubrication depends on the gain and time constants included in the differential equation. It is shown that the coefficient К1 takes into account the degree of influence of the input signal (load, sliding speed, tribological characteristics of the lubricating medium), on the value of the output signal (quality factor of the tribosystem). Coefficient К2 takes into account the magnitude of the change of the output parameters (volumetric wear rate and friction coefficient) when changing the values of the input parameters (load, sliding speed, quality factor of the tribosystem. Coefficient К3 takes into account the degree of influence of the input signal on the restructuring of the material structure in the surface layers of the triboelements.The time constants of the tribosystem characterize the inertia of the processes occurring in the tribosystem, during running-in, or during changes in operating modes. Increasing the time constants makes the process less susceptible to changes in the input signal, the running-in process increases over time, and the tribosystem becomes insensitive to small changes in load and slip speed. Conversely, the reduction of time constants makes the tribosystem sensitive to any external changes.
Highlights
Methods of calculating and modeling the processes of friction and wear in tribosystems of machines and mechanisms have been actively developing, which makes it possible to significantly reduce costs in the process of designing and fine-tuning new structures
Coefficient К2 takes into account the magnitude of the change of the output parameters when changing the values of the input parameters
The time constants of the tribosystem characterize the inertia of the processes occurring in the tribosystem, during running-in, or during changes in operating modes
Summary
Methods of calculating and modeling the processes of friction and wear in tribosystems of machines and mechanisms have been actively developing, which makes it possible to significantly reduce costs in the process of designing and fine-tuning new structures. Analysis of models of stationary processes in tribosystems shows that there is a large error in modeling the wear rate, up to 12,8 % and coefficient of friction, up to 14,0 %. Such a scatter of data in measurements can be explained by the presence of an oscillatory process of the wear rate and the coefficient of friction during the operation of the tribosystem, as well as by the ambiguity of the choice of input parameters for modeling
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