Mathematical model of running-in of tribosystems under conditions of boundary lubrication. Part 1. Development of a mathematical model

Voitov, A.V.

doi:10.31891/2079-1372-2022-107-1-25-33

Cited by 2 publications

(8 citation statements)

References 15 publications

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“…In work [9] structural and parametric identification of the tribosystem as an object of simulation of run-in under conditions of extreme lubrication. It has been established that the processes of running-in of tribosystems are described by a second-order differential equation and, unlike the known ones, take into account the limit of loss of stability (robustness reserve) of tribosystems.…”

Section: Methodsmentioning

confidence: 99%

“…-rheological properties of the structure of composite materials in the tribosystem RSТS, is determined by the formula given in the work [11]. The solution for the given in the work [9] of the differential equation when modeling the volumetric rate of wear, there is the following expression:…”

Section: Methodsmentioning

confidence: 99%

“…The solution for the given in the work [9] of the differential equation when modeling the friction coefficient has the following expression:…”

Section: Methodsmentioning

confidence: 99%

“…The following are subject to study as significant factors: the design of the tribosystem; lubricating medium; the structure of conjugated materials in the tribosystem; roughness of friction surfaces; load and sliding speed. This article is a continuation of the work [9], where the mathematical model of the running-in process was obtained. The ranking of factors will allow us to develop a program for the effective running-in of various designs of tribosystems, which will be a continuation of this work.…”

Section: Literature Reviewmentioning

confidence: 98%

“…In work [9] the methodical approach was further developed in obtaining mathematical models that describe the running-in of tribosystems under boundary lubrication conditions. The structural and parametric identification of the tribosystem as an object of simulation of running-in under conditions of extreme lubrication was carried out.…”

Section: Literature Reviewmentioning

confidence: 99%

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Mathematical model of running-in of tribosystems under conditions of boundary lubrication. Part 2. Simulation results

Voitov¹

2023

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The paper presents the results of mathematical modeling of tribosystems running-in processes when various factors are changed: design parameters of tribosystems, which are taken into account by the form factor; tribological properties of the lubricating medium; rheological properties of composite materials in the tribosystem; roughness of friction surfaces; load and sliding speed. By comparing the theoretically obtained results, by modeling according to the developed models, with experimental data, it was established that the mathematical model adequately reflects the running-in processes taking into account the changes in constructive, technological and operational factors. Applying the Cochrane criterion, it was established that the obtained experimental results are homogeneous and reproducible. The maximum value of the coefficient of variation of the values of the volumetric wear rate and the coefficient of friction is within the limits v = 12,3 - 26,5%. The value of the simulation error is within the limits v = 7,7 - 12,9%. A rating of factors that maximally affect the processes of running-in of tribosystems in the conditions of extreme lubrication has been obtained. In the first place is the roughness of the friction surfaces, the coefficient of variation v = 26,5%. In the second place – the load on the tribosystem during running-in, the coefficient of variation v = 20,8%. In third place is the value of sliding speed during running-in, the coefficient of variation v = 18,6%. The conclusion made must be taken into account when developing a rational program for running-in tribosystems in conditions of extreme lubrication. The methodical approach of applying the acoustic emission method in the study of tribosystem running-in processes is presented. It is proved in the work that in order to determine the volume rate of wear during tribosystem running-in, it is necessary to register and analyze the fourth cluster from the general acoustic emission signal. The sources of signal generation of the fourth cluster are microcutting and plastic deformation of protrusions of the roughness of the friction surface, which is characteristic of the first stages of running-in.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The solution for the given in the work [9] of the differential equation when modeling the friction coefficient has the following expression:…”

Section: Methodsmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 98%

Section: Literature Reviewmentioning

confidence: 99%

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Mathematical model of running-in of tribosystems under conditions of boundary lubrication. Part 2. Simulation results

Voitov¹

2023

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Substantiation of a rational program for the running-in of tribosystems

Vojtov,

Voitov

2023

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The paper presents the results of studies on the justification of a rational program for running-in of tribosystems. It is shown that the first component of the program is the fulfillment of the condition on the verge of loss of stability due to the appearance of accelerated wear, with the maximum load on the tribosystem and the minimum sliding speed. This mode performs the function of "training" the surface layers for future operating conditions due to deformation processes and changes in the roughness of the friction surfaces. The mode is characterized by minimum wear rate values and maximum friction coefficient values. The second component of the running-in program is the fulfillment of the condition on the verge of loss of stability due to the appearance of burrs on the friction surfaces, with minimal load on the tribosystem and maximum sliding speed. This mode performs the function of "adaptation" of the surface layers to the future operating conditions by increasing the rate of deformation of the materials of the surface layers on the spots of actual contact. The mode is characterized by maximum wear rate values and minimum friction coefficient values. The third mode of the program aims to form surface structures and roughness on the friction surfaces of tribosystems that correspond to operational modes. This mode performs the function of "sufficient adaptation" of the surface layers to the future operating conditions, and corresponds to the condition with the maximum value of the stability margin. The final result of the running-in process is the transition of the tribosystem from an unbalanced, thermodynamically unstable state to a stationary, equilibrium state, as a result of which such parameters as wear rate, friction coefficient, temperature and roughness of the friction surfaces are stabilized. Such a step-by-step transition is associated with the formation of a special, dissipative structure of the surface layers of triboelements as a result of self-organization. The use of the three-mode program will reduce the time for tribosystems to run in by 23.0 - 38.4% compared to other programs. The effectiveness of the developed three-mode program is proven by experimental studies with the calculation of the modeling error.

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Mathematical model of running-in of tribosystems under conditions of boundary lubrication. Part 1. Development of a mathematical model

Cited by 2 publications

References 15 publications

Mathematical model of running-in of tribosystems under conditions of boundary lubrication. Part 2. Simulation results

Mathematical model of running-in of tribosystems under conditions of boundary lubrication. Part 2. Simulation results

Substantiation of a rational program for the running-in of tribosystems

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