Structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubrication
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 functi...
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Khmelhitsky National University, Lublin University of Technology
2021-06-01
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Online Access: | https://doi.org/10.31891/2079-1372-2021-100-2-26-33 |
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doaj-94c14c37d52247189f19a2266554f52a2021-07-11T15:55:48ZengKhmelhitsky National University, Lublin University of TechnologyПроблеми трибології2079-13722021-06-01262/100 (2021)263310.31891/2079-1372-2021-100-2-26-33Structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubricationA.V. Voitov0Kharkiv Petro Vasylenko National Technical University of Agriculture, Kharkiv, UkraineIn 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 https://doi.org/10.31891/2079-1372-2021-100-2-26-33tribosystemmathematical modeldifferential equationsstructural identificationgaintime constantboundary lubrication |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
A.V. Voitov |
spellingShingle |
A.V. Voitov Structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubrication Проблеми трибології tribosystem mathematical model differential equations structural identification gain time constant boundary lubrication |
author_facet |
A.V. Voitov |
author_sort |
A.V. Voitov |
title |
Structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubrication |
title_short |
Structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubrication |
title_full |
Structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubrication |
title_fullStr |
Structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubrication |
title_full_unstemmed |
Structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubrication |
title_sort |
structural identification of the mathematical model of the functioning of tribosystems under conditions of boundary lubrication |
publisher |
Khmelhitsky National University, Lublin University of Technology |
series |
Проблеми трибології |
issn |
2079-1372 |
publishDate |
2021-06-01 |
description |
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
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topic |
tribosystem mathematical model differential equations structural identification gain time constant boundary lubrication |
url |
https://doi.org/10.31891/2079-1372-2021-100-2-26-33 |
work_keys_str_mv |
AT avvoitov structuralidentificationofthemathematicalmodelofthefunctioningoftribosystemsunderconditionsofboundarylubrication |
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1721308479987122176 |