Methodical Approach to Using Acoustic Emission Method for Tribosystem Monitoring

Vojtov, Victor; Fenenko, Katherine; Voitov, A.; Hrynkiv, Andrii; Lyashuk, Оleg; Lozić, Joško

doi:10.24874/ti.1298.05.22.08

Cited by 2 publications

(9 citation statements)

References 23 publications

(60 reference statements)

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“…To determine the rate of wear in the process of running in tribosystems (in online mode), we will use the conclusions of the work [14]. The purpose of this study is to develop a methodology for diagnosing various structures of tribosystems with the justification of informative frequencies and amplitudes when recording acoustic emission (AE) signals from the friction zone.…”

Section: Resultsmentioning

confidence: 99%

“…In work [14] the sequence in the construction of the method of diagnosing tribosystems during runningin is formulated.…”

Section: Resultsmentioning

confidence: 99%

“…3. According to the formulas given in [14], the rate of deformation of the triboelement material and the informative frequency that the triboelement will generate during the run-in process are determined. Calculations of the informative frequency must be performed for the triboelement material on which the piezo element will be installed.…”

Section: Resultsmentioning

confidence: 99%

“…Taking into account the noise coming from the equipment, the cluster K1 in the frame is determined, as well as the sufficiency of the length of the frame being registered. The sufficiency of the frame length is established using the value of the autocorrelation coefficient, the calculation method of which is presented in [14].…”

Section: Resultsmentioning

confidence: 99%

“…5. According to the formulas presented in [14], the values of the informative amplitudes of the K4 cluster are determined.…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%

“…In work [14] the sequence in the construction of the method of diagnosing tribosystems during runningin is formulated.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…5. According to the formulas presented in [14], the values of the informative amplitudes of the K4 cluster are determined.…”

Section: Resultsmentioning

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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Methodological Approach in the Simulation of the Robustness Boundaries of Tribosystems under the Conditions of Boundary Lubrication

et al. 2023

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In the presented work, a methodical approach was developed for determining rational operation modes of tribosystems, taking into account their design. This approach makes it possible in the designing stage, according to the predicted operating modes, to calculate the limits and margins of stable work in operation. The definition of the robustness of the tribosystem and the criteria for assessing the robustness are formulated based on the theory of stability of technical systems. It is shown that such a methodical approach allows for determining the modes of the rational operation of the designed structures without damaging the friction surfaces. Experimental studies have proven that not all designs of tribosystems lose stability due to the appearance of friction surface burrs. There are designs where the loss of stability occurs upon the appearance of accelerated wear. The developed criteria take into account two options for the loss of stability. An experimental verification of the modes of loss of stability of tribosystems was performed by the appearance of a burr or the beginning of accelerated wear with the calculated values of the robustness criteria. The obtained results allow us to conclude that the modeling error is within 8.3–18.7%, which is a satisfactory result in the study of friction and wear processes. Robustness criteria is based on the coefficient of friction RRf and wear rate RRI, and must be used when designing new constructions of tribosystems. Theoretical calculations of such criteria and the dependence of their change on changing the predicted operating modes will allow for justifying rational operating modes within their stability.

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Methodical Approach to Using Acoustic Emission Method for Tribosystem Monitoring

Cited by 2 publications

References 23 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

Methodological Approach in the Simulation of the Robustness Boundaries of Tribosystems under the Conditions of Boundary Lubrication

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