Optimization of Tribotechnical Characteristics of Wheel–Rail Friction Modifiers

Mayba, I. A.; Glazunov, D. V.

doi:10.3103/s1068366620060136

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…Therefore, it is almost impossible to ensure stable values of the ko coefficient of adhesion required for driving without boxing. In connection with it, experts and scientists around the world are offered to prevent to use as a traditional means in the form of sand, and a variety of mechanical, chemical methods of activation of the clutch by cleaning the rails [5][6][7], assessment methods slipping wheel sets [8], the use of abrasive powders [9,10], friction modifiers [11][12][13][14][15].…”

Section: Resultsmentioning

confidence: 99%

Increase the resource and reduce the life cycle cost locomotive wheelset

Mayba

Valinsky²

2023

E3S Web of Conf.

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The paper presents the results of research on the analysisy of modern technical means and technologies to increase the service life and reduce the cost of the life cycle of a locomotive wheelset. Calculations are performed and the results of technical and economic efficiency of the use of modern innovative comb-smearing devices lubrication (USGL) and plasma hardening devices (SCR) for locomotive wheel pairs, as well as clutch activation devices (UATL), are presented. The practice of operating USGL and UPU devices has shown that the most effective is their joint use with the achievement of a consolidatedого effect on increasing the service life of locomotive wheel bands. Technical and economic calculation of the efficiency of using UATL friction activation devices has shown the economic feasibility of using locomotive coupling activation systems которые обеспечиваю, which provide an increase in the mileage of locomotives between equipment in the conditions of field operation of the locomotive fleet and reduce the cost of building additional points for equipping locomotives with sand.

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Section: Resultsmentioning

confidence: 99%

Increase the resource and reduce the life cycle cost locomotive wheelset

Mayba

Valinsky²

2023

E3S Web of Conf.

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“…Tribodiagnostics performs the role of monitoring lubricant degradation and the wear condition of machinery. Advanced analytical methods, such as spectroscopic analysis, microscopic investigations, and thermographic techniques, allow for a more detailed study of the interactions between surfaces, wear, and lubricant [28]. The paper "Experimental Evaluation of the Influence of Microgeometry on the Tribological Characteristics of a Radial Plain Bearing" describes research on current trends in increasing the load-carrying capacity of plain bearings using friction surface texturing.…”

Section: Methodology and Research Of The Correlation Between Monitore...mentioning

confidence: 99%

Assessment of the Correlation between the Monitored Operating Parameters and Bearing Life in the Milling Head of a CNC Computer Numerical Control Machining Center

Baron,

Pivtorak,

Ivan

et al. 2024

Machines

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The present paper describes a study conducted at the request of the operator of machining center equipment. The operator observed undesirable indicators in terms of increased backlash and vibration of the milling head and poor quality of the machined surfaces. Vibration measurements and vibrodiagnostics were carried out before disassembling the milling head in the idle state. The bearings, lubricant, and friction regime were analyzed in the next step. The vibrodiagnostic methods used included VEL, ACC, EN2, EN3, and EN4, with recommended limits conforming to STN ISO 10816-3. The vibration values obtained indicated a problem with the bearings, exceeding the limit values. After disassembly of the bearings, abrasive wear, corrosion, and improper lubricant conditions were detected. Lubricant analysis showed the presence of abrasive and corrosive particles, indicating an unsatisfactory friction regime. Determining the optimum lubricant temperature and the effect on friction torque constituted other aspects of the study. Inspection of the bearing microgeometry confirmed unsatisfactory roundness. Furthermore, the assembly of tapered roller bearings with axial preload was analyzed with a focus on bearing stiffness, accuracy, and life. The results showed that preload improves shaft guidance accuracy and load distribution, promoting reliable operation and extending bearing life.

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“…These laws need special research methods. The existing methods of research and calculation of electric locomotive uptime can provide serious assistance in the operation of traction rolling stock for a comprehensive technical and economic assessment and development of measures to improve their quality [8][9][10]. Therefore, the use of special methods of calculating locomotives for reliability and non-failure is important.…”

Section: Introductionmentioning

confidence: 99%

Locomotive Reliability Assessment Method

Gubarev

2022

Materials Research Proceedings

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Abstract. The authors describe the analysis of the current state of the problem under consideration. A definition of "averaged failure flow parameter" is given. The periods of traction rolling stock life cycle are considered. The assumption of event distribution laws exponentiality is introduced, which makes it possible to obtain expressions of the main reliability indices in the analytical form. The work of depot service locomotives to ensure the required reliability and readiness of the rolling stock during their normal operation has been assessed. The introduction of the term "readiness" into the modern practice of traction rolling stock reliability estimation is considered. The initial data for calculating the indexes of locomotive uptime and readiness are presented. Calculated values of readiness and no-failure indices of electric locomotives in operation are obtained. The calculated values of internal and technical availability coefficients are compared with similar indicators established by technical specifications. Control procedures were performed to determine the compliance of each set of locomotives (EP1, 2ES4K) with the uptime requirements. As a result of comparing the calculated values of internal and technical availability factors (for electric locomotives EP1 and 2ES4K with analogous values set by specifications (EP1 and 2ES4K) it was determined that the surveyed locomotives comply with the established availability requirements. As a result of control procedures to determine the compliance of each set of EP1 and 2ES4K locomotives with the uptime requirements, it was determined that the set of 2ES4K electric locomotives for the run in question does not fully comply with the uptime requirement. And the set of EP1 electric locomotives meets the reliability requirements, but the error value is higher than 20%. To clarify both events, it is necessary to increase the mileage interval of the locomotives and repeat the procedure for determining compliance with the uptime requirements. The method of assessing the uptime and readiness of locomotives during their normal operation makes it possible to identify existing shortcomings in the operation of rolling stock and to form measures to improve the quality of rolling stock operation.

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Optimization of Tribotechnical Characteristics of Wheel–Rail Friction Modifiers

Cited by 9 publications

References 6 publications

Increase the resource and reduce the life cycle cost locomotive wheelset

Increase the resource and reduce the life cycle cost locomotive wheelset

Assessment of the Correlation between the Monitored Operating Parameters and Bearing Life in the Milling Head of a CNC Computer Numerical Control Machining Center

Locomotive Reliability Assessment Method

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