Determination of rational roughnes of the side surface of the rail top in curved sections of the underground railway track

Voronin, Sergey; Skoryk, Oleksii; Korostelov, Yevhen

doi:10.15587/1729-4061.2016.75707

Cited by 5 publications

(10 citation statements)

References 9 publications

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“…Thus, the rational roughness values of the railhead side surfaces of the high rails in curves of underground tracks were obtained. The results of the bench tests [2] are confirmed by the research in operational conditions on tracks in Kharkiv Metro.…”

Section: Analysis Of Recent Studies and Publicationssupporting

confidence: 61%

“…The primary inspection of rails in Kharkiv Metro demonstrated the presence of contact fatigue defects of the «head checking» type indicating, as the authors believe, the initial stage of the defect, according to figure 11.1-2 [2], which appeared due to lack of contact fatigue strength of the rail steel. This may lead to early removal of such rails.…”

Section: Introductionmentioning

confidence: 90%

“…In [10] on the friction device for such research the wheel/rail contact along the railhead side surface in a curve in the underground system was simulated. The number of experiments [2] of the influence of the roughness of railhead surfaces of the high rails in curves of underground tracks on the friction force in a simulated wheel/rail contact was conducted. Thus, the rational roughness values of the railhead side surfaces of the high rails in curves of underground tracks were obtained.…”

Section: Analysis Of Recent Studies and Publicationsmentioning

confidence: 99%

“…The average life of rails laid in curves of Kharkiv Metro is 1.5-2 years [2], which is too long. The measures for preventing the mentioned defects include, mostly, slower development of contact fatigue defects at initial stages [1].…”

Section: Introductionmentioning

confidence: 99%

“…Development of the defect according to figure 11.1-2 [1,2] as dominant for rails of Kharkiv Metro is a multistage process accompanied by the appearance of nano-and microcracks, propagation of cracks, layer separation and spalling the contact surface material. These effects are of contact fatigue nature.…”

Section: Introductionmentioning

confidence: 99%

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Study of the predominant defect development in rails of underground systems after preventive grinding and lubrication

et al. 2017

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Abstract. In order to determine the method of contact surface treatment and to define the rational surface roughness in the wheel/rail contact for the minimal growth rate of contact fatigue defects the program of experiments in operational conditions was developed. On the basis of the results and calculations the coefficients of regression equations, which describe dependencies of the wear rate on the parameters of the contact surface treatment in real operational conditions were obtained. Besides, the diagrams of dependencies of the friction coefficient on the roughness of railhead contact surface of the high rails with and without lubrication, when laid in curves of underground systems, were built. The experiments conducted in operational conditions of Kharkiv Metro revealed the influence of roughness of the railhead side surface of the high rails in curves on the contact fatigue defect development after preventive grinding and lubrication. According to the results of the experiments it was established that the rail preventive grinding with simultaneous lubrication led to slower contact fatigue defect development in rails of underground systems. The rational roughness of the railhead side surface of the high rails in curves after preventive grinding, which led to the minimal rate of defect development, was defined.

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Section: Analysis Of Recent Studies and Publicationssupporting

confidence: 61%

Section: Introductionmentioning

confidence: 90%

Section: Analysis Of Recent Studies and Publicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the predominant defect development in rails of underground systems after preventive grinding and lubrication

et al. 2017

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The influence of external field on the lubricity of mineral oil for railway transport

et al. 2017

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Abstract. The use of mineral oil is associated with its gradual operational degradation caused by its natural aging and contamination with various impurities. As the concentration of impurities increases, the number of active surface molecules which determine the operational properties of mineral oils decreases. A promising method of recovery of the operational properties of oils is the treatment with an electric field, which makes it possible to enhance the activity of surfactants in the tribo-contact area. This statement is proved through the improvement of the wettability of the bronze surface with mineral oils after their treatment with an electrostatic field. However, the method of electrical treatment is associated with the need to increase the requirements for the purity of liquids, especially to the presence of water, which requires creating an oil pre-treatment system. As an alternative, a method of electrical treatment with special field parameters is proposed enabling to accelerate the coalescence process. The major parameter that accelerates the coalescence process is the electric field oscillation frequency. The results of the study give grounds for choosing the optimal field parameters.

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Determination of the level of separate rail failure using the indicator of their reliability

et al. 2018

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During the operation, the upper railway track structure constantly tends to age, which includes the increasing number of failures. This process is controlled by the track maintenance system, which provides for the current maintenance of the track in a certain railway section. As part of the current maintenance of the track, in particular, works are performed to eliminate defective elements of the upper railway track structure, which appeared during functioning of the track structure. The dependence of the operational cargo turnover on the amount of transported cargoes has been analyzed. It is directly related to the issues of organization of maintenance of the railway track structure taking into account the current track operation conditions. Regression analysis of the reported data allowed establishing a mathematical model of the dependence of the value of operational cargo turnover on the value of the transported cargo. The service life of rails (rail bars) in the track section has been established to be related to the indicator separate rail failure during the period of operation of the upper railway track structure by defects. The safety level of rails (rail bars) can be determined based on the value of this indicator.

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Determination of rational roughnes of the side surface of the rail top in curved sections of the underground railway track

Cited by 5 publications

References 9 publications

Study of the predominant defect development in rails of underground systems after preventive grinding and lubrication

Study of the predominant defect development in rails of underground systems after preventive grinding and lubrication

The influence of external field on the lubricity of mineral oil for railway transport

Determination of the level of separate rail failure using the indicator of their reliability

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