Sensitivity of Stresses to the Forces Acting on the Cast Parts of Freight-Car Bogie

Reidemeister, O. G.; Shykunov, O. A.

doi:10.15802/stp2018/141186

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Fundamental solutions cannot be efficient without proper ensuring of the operation reliability of the rolling stock and its components under the real operating conditions and during repairs. [1][2][3] The traffic safety analysis in the rolling stock industry of the Ukrainian railroad in recent years points to the need for modernization and improvement of the obsolete and wornout technological equipment for maintenance and repair, which will, first of all, ensure a high level of reliability and, thereby, guarantee the traffic safety increase. 4,5…”

Section: Introductionmentioning

confidence: 99%

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Predictive model of risks in railroad transport when diagnosing axle boxes of freight wagons

Мурадян

Pitsenko

Shaposhnyk

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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The research is aimed at developing a predictive model of the risks in railroad transport when using diagnostics of the axle boxes of freight wagons, which will allow assessing traffic safety during the operation of freight wagons. To develop a predictive model of the risks in railroad transport, the approaches of the probability theory were used. The constructed predictive model of the risks makes it possible to assess traffic safety during freight transportations; to determine further measures to reduce them; to evaluate the diagnostic method. The authors developed a predictive model of the risks in railroad transport when using the diagnostic methods of freight wagons’ axle boxes during maintenance and repair of axle box. This model includes the probability of failure-free operation of the axle boxes of freight wagons, the probability of identifying of the technical condition of the axle boxes of freight wagons, the significance of the diagnostic parameter and its relative assessment after appropriate maintenance, repair or technical control.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predictive model of risks in railroad transport when diagnosing axle boxes of freight wagons

Мурадян

Pitsenko

Shaposhnyk

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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Mathematical Model of Risks in Railway Transport During Diagnostics of Axle Boxes of Freight Cars

Мурадян¹,

Pitsenko²,

Shaposhnyk³

2021

STP

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Purpose. The research is aimed at developing a mathematical model for determining the risks in railway transport during the diagnostics of axle boxes of freight cars, which will provide an assessment of traffic safety in the case of freight transportations. Methodology. To develop a mathematical model for determining the risks in railway transport, a continuous static model of the dependence of the level of individual approach of service personnel on the level of common interests (crew, shift) was used. Three types of dependencies were considered: optimistic, neutral, pessimistic. Findings. A mathematical model has been developed that allows assessing the risks and the level of train traffic safety during the diagnosis of axle boxes of freight cars, as well as determining further measures to reduce risks. In the process of assessing the level of individual approaches and general interests of a particular railway subdivision during maintenance and repair of the axle box of freight cars the variants for the limit possibilities of this subdivision were considered. At the same time extreme values for equilibrium distribution, for a case of dominance of maintenance and for a case of dominance of repairs of freight car’s axle box were established. Originality. For the first time, a mathematical model of risks in railway transport was developed, which is formed during the maintenance and repair of freight cars. It allows determining the level of traffic safety during freight transportations and outlining further measures to reduce risks. The method of studying the efficiency of the system of maintenance and repair of the axle box has been further developed, which, in contrast to the existing one, establishes the dependence of the number of maintenance of axle boxes on the number of their repairs in operation and will increase traffic safety. Practical value. The application of the obtained mathematical models of risks in railway transport can reduce the risks during the diagnostics of axle boxes of freight cars in order to increase the local or general level of train traffic safety.

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The results of field studies of the stress-strain state steel-reinforced concrete span structure of the railway bridge

HERNICH¹,

KLIUCHNYK²

2022

STP

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Purpose. The purpose of the study was to determine the stress-strain state and operating characteristics of the existing steel-reinforced-concrete span structure under the railway after long-term operation under static and dynamic loads. Methodology. To achieve the goal, full-scale surveys of the existing bridge crossing were carried out, more attention was focused on the steel-reinforced concrete span structure, the conditions and features of its operation were determined, and static and dynamic tests were conducted. During the tests, the general deformations of the span structures (vertical and horizontal deflections) and the stress state in the elements of the structures under different load schemes were measured. During dynamic tests, registration of static and dynamic component deflections and stress changes in structural elements during the passage of rolling stock along the span structure was carried out. The interaction of the span structure with the rolling stock, the influence of uneven approaches to the bridge on the excitation of the rolling stock was investigated. Findings. The values of stresses in the elements of the steel-reinforced-concrete span structure were obtained when the test load was installed in the position at which the greatest stresses and deformations should occur in the test elements, the frequencies of natural and forced oscillations of the span structure were measured, the dynamic coefficient, the dynamic deflections of the main beams were determined, the values decrements of oscillations of the frequency of natural and forced oscillations. The dynamic interaction of the rolling stock with the steel-reinforced concrete span structure was studied. Analytical assumptions in the design of steel-reinforced-concrete span structures of bridges have been confirmed. Originality In the work, a study of the stress-deformed state of the steel-reinforced concrete span structure of the railway bridge after long-term operation, the simultaneous operation of the span structure with rolling stock was carried out. Practical value. The operating conditions of the steel-reinforced-concrete span structure of the railway bridge, static and dynamic characteristics of its operation, the interaction of the rolling stock with the span structure, the influence of the unevenness of the approach track to the bridge on the dynamic interaction of the span structure and the rolling stock are determined. Practically confirmed analytical calculations of deformation and dynamic characteristics of steel-reinforced-concrete span structures of bridges, the joint operation of steel beam and reinforced concrete slab is ensured to a sufficient extent and corresponds to theoretical assumptions.

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Sensitivity of Stresses to the Forces Acting on the Cast Parts of Freight-Car Bogie

Cited by 4 publications

References 9 publications

Predictive model of risks in railroad transport when diagnosing axle boxes of freight wagons

Predictive model of risks in railroad transport when diagnosing axle boxes of freight wagons

Mathematical Model of Risks in Railway Transport During Diagnostics of Axle Boxes of Freight Cars

The results of field studies of the stress-strain state steel-reinforced concrete span structure of the railway bridge

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