Assessment of the quality factor of tribosystems and relationship with tribological characteristics

Vojtov, Viktor; Voitov, A.

doi:10.31891/2079-1372-2020-98-4-20-26

Cited by 6 publications

(15 citation statements)

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“…The results of experimental studies of changes in the value of the external influence on the tribosystem in which there is a loss of stability when changing all the above factors, which can be taken into account by the value of the quality factor of the tribosystem Q0, presented in the fourth block of table 1. Determination of the quality factor of the tribosystem is given in the paper [14].…”

Section: Resultsmentioning

confidence: 99%

Experimental verification between the functioning of tribosystems in the conditions of boundary lubrication

Voitov¹

2022

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The paper presents an experimental test of modeling the limits of stable operation of different structures of tribosystems (robustness criteria) in the conditions of extreme lubrication. The results of the experimental test confirmed the previously concluded conclusion that not all structures of tribosystems lose stability in terms of the coefficient of friction, i.e. the appearance of burrs on the surfaces of the friction. At low values of the coefficient of shape and low values of the quality factor of the tribosystem, the loss of stability occurs due to accelerated wear of materials.Expressions for calculation of criteria of robustness of tribosystems taking into account speed of change of loading on tribosystem are received. The rate of change of load is taken into account by the coefficients of dynamism, which are obtained taking into account the right-hand side of the differential equation of the dynamics of the functioning of tribosystems. Analysis of the obtained theoretical results on the assessment of the robustness of tribosystems and their comparison with the results of the experiment, suggest that the obtained conditions for stable operation of tribosystems (criteria of robustness) allow theoretically, with error 10,3 - 13,3 %, determine the boundaries of sustainable work. Criteria for the robustness of the tribosystem by wear rate and friction coefficient should be used in the design of tribosystems.

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Section: Resultsmentioning

confidence: 99%

Experimental verification between the functioning of tribosystems in the conditions of boundary lubrication

Voitov¹

2022

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“…where Q0 and Qmaxthe initial value of the quality factor of the tribosystem and the value of the quality factor formed during the running-in of the tribosystem. Determined by the formulas given in the work [13].…”

Section: Resultsmentioning

confidence: 99%

“…In work [13] the proposed physical quantity is the quality factor of the tribosystem Q, and the dependences of the change in the quality factor on the initial value are given Q0 to the maximum value Qmax, which increases during running-in.…”

Section: T T T P T T T T T T P T T T к кmentioning

confidence: 99%

Parametric identification of the mathematical model of the functioning of tribosystems in the conditions of boundary lubrication

Voitov

2021

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The parametric identification of the tribosystem as an object of modeling the functioning of tribosystems in the conditions of boundary lubrication is performed in the work. Using the analysis of the dimensions of significant factors, expressions are obtained to calculate the gain and time constants. It is established that the coefficient takes into account the degree of influence of the load, sliding speed, tribological characteristics of the lubricating medium on the quality factor of the tribosystem. It is shown that the increase in the coefficient will have a positive effect on the processes inherent in tribosystems during operation. Coefficient – characterizes the magnitude of the change in volumetric wear rate and friction coefficient when changing the magnitude of the load, sliding speed, quality factor of the tribosystem. Coefficient – characterizes the ability of the tribosystem to self-organize when changing the values of the input parameters by rearranging the surface layers of materials from which the triboelements are made during secondary running-in. It is shown that the value of the coefficient is large will contribute to the rapid change in the roughness of the friction surfaces, the restructuring of the structure of the surface layers, the appearance of oxidizing films on the friction surfaces (secondary structures). It is proved that the time constant – this is the time required to change the roughness of the friction surfaces and rearrange the structure of the materials of the surface layers when changing external conditions. Time constant characterizes the time during which there is a stabilization of the temperature gradient by volume of triboelements, taking into account the thermal conductivity of materials when changing external conditions. Time constant characterizes the time during which the tribosystem returns to a steady state of operation after the cessation of the outrageous force, or the time to stabilize the parameters in the new mode of operation. It is proved that the value will be optimal for the process of self-organization. It is shown that one of the factors that can control the value , this is the sliding speed

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“…Аналіз останніх досліджень Важливим аспектам оптимізації та забезпечення контроля за використанням технічних ресурсів складних систем присвячені результати наукових досліджень [1][2][3][4][5][6][7][8][9]. Фундаментальна робота [1] містить загальну теорію розрахунку і оптимізації систем з розподіленими параметрами.…”

Section: постановка проблеми у загальному вигляді та її зв'язок із ва...unclassified

Mathematical Models’ Development of Applied Tasks of Geometric Design of Technical Systems

Levkin¹,

Zhernovnykova²

2022

Herald KhmNU.TS

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This article examines the issues of developing mathematical models for optimizing the parameters of the thermal action on the technical systems. The authors set the task of determining the optimal parameters of sources of temperature field disturbance in the technical system under the appropriate restrictions. Considering the technical characteristics of the means that ensure the process of thermal action on the material, and the peculiarities of the technological process, appropriate restrictions on the temperature field and its components are set. Checking the limits of the temperature field requires multiple calculations, which reduce thermal damage to parts of the material. To automate the objective function, it is possible to use grid processors, which, due to the use of specialized functional blocks, solve a huge number of boundary problems with computers almost instantly. Because to the selection of solutions of boundary value problems, this will allow to find optimal values of technical parameters, and therefore to increase the accuracy of the simulated process. The research of this article refers to the section on mathematical modeling and optimization of systems with distributed parameters. For mathematical modeling of these systems, boundary value problems of differential equations with partial derivatives are used. The authors present applied optimization mathematical models for controlling the distribution of the temperature field and thermal stresses in the material, minimizing its damaged parts. The last them is based on the differential criterion for evaluating the temperature of irradiation and can be used to optimize many technical, biotechnological and economic systems. A detailed analysis of the specific features of applied optimization mathematical models will allow to increase the accuracy of the development of numerical methods and hardware and software tools for calculating and optimizing the parameters of simulated systems.

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Assessment of the quality factor of tribosystems and relationship with tribological characteristics

Cited by 6 publications

References 1 publication

Experimental verification between the functioning of tribosystems in the conditions of boundary lubrication

Experimental verification between the functioning of tribosystems in the conditions of boundary lubrication

Parametric identification of the mathematical model of the functioning of tribosystems in the conditions of boundary lubrication

Mathematical Models’ Development of Applied Tasks of Geometric Design of Technical Systems

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