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

Мурадян, Леонтій Абрамович; Pitsenko, Iryna; Shaposhnyk, Vladyslav

doi:10.15802/stp2021/230223

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Muradian et al [5,6] presents the results of operational research into the assessment of factors causing defects of thermal origin on the rolling surface of the wheel pair when interacting with composite brake pads. To prevent such defects, the authors propose using composite pads with metal inserts that will reduce their wear.…”

Section: Introductionmentioning

confidence: 99%

Determination of the thermal stress state for the composite brake pad of a wagon at operational loads

Panchenko,

Vatulia,

Lovska

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The article provides the results of determining the thermal stress state of the composite brake pad of a wagon. The research is made by means of computer simulation with the finite element method using the SolidWorks Simulation options. The design diagram of the pad includes not only the horizontal loads due to its pressing to the rolling surface of the wheel and the friction force, but also the temperature impact taken equal to 400°C. Since the composite material of the pad is fragile, the Mohr–Coulomb criterion is used as a calculation criterion. It has been found that the maximum stresses occur in the upper part of the pad in the contact area between the back plate and the side plate and do not exceed the permissible values. The article presents the results of the calculation of the thermal stress state of the pad with dual wedge-shaped wear. The study includes the actual parameters of the pad wear determined during operational research. The results of the calculation show that the maximum stresses occur in the back plate of the pad and exceed the permissible values by 19.8%. This is explained by the fact that the useful area of the pad decreases, and therefore its loading increases. The research conducted proves the negative impact of dual wedge-shaped wear on the braking efficiency and the strength of the brake pad. This requires development of measures for eliminating this wear.

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Section: Introductionmentioning

confidence: 99%

Determination of the thermal stress state for the composite brake pad of a wagon at operational loads

Panchenko,

Vatulia,

Lovska

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…The paper 28 presents a research method for the efficiency of the maintenance and repair system of the axle box, which establishes the dependence of the number of maintenance services of the axle boxes on the number of their repairs during operation and allows increasing the level of traffic safety. The use of the risk models presented in the work in the railroad transport can reduce the risks when diagnosing the axle boxes of freight wagons in order to increase the local or general level of train traffic safety.…”

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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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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Influence of Maintenance and Repair of Axle Boxes on the Risks of Their Failure

Мyaмlin¹,

Мурадян²,

Shykunov³

et al. 2022

STP

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Purpose. The main purpose of the study is to identify the interconnection between the risks of failure of axle boxes of freight cars and the success of performing a complex task of maintenance and repair. To do this, one should identify the sequence of calculating the values of successful completion of the complex task of maintenance and repair of freight cars, make practical calculations using the example of car repair companies of Prydniprovska Railway regional branch and identify the dependencies of failure risks of the freight cars and the process of successful completion of the task. Methodology. The paper constructs the interconnections of the probabilities of performing and not performing a complex task of maintenance and repair of freight cars. In addition, the calculation sequence of static probability estimates of successful performing and not performing of the set task, static estimates of the average deviation time and the main time of successful performing, as well as its intensity is presented. Findings. The obtained statistical data of the effective implementation of the complex task of maintenance and repair of freight cars at Prydniprovska Railway regional branch and the results of their empirical distribution throughout a period of 90 days, showed that the sample average is 24.1078 cars, the sample variance is 3.28 cars, the value of the standard deviation is 1.81 cars, and the coefficient of variation is 0.075 cars. The influence of diagnostics on the failure risks of axle boxes of freight cars during operation after fulfilling the task of maintenance and repair is also established. Originality. Based on statistical processing of experimental data, for the first time an empirical distribution of statistical data of successful completion of a complex task of maintenance and repair of freight cars was performed, which allows calculating the reliability indicators of axle boxes after maintenance and repair of freight cars. For the first time, the dependence of axle boxes diagnostics on the risk of failure of performing the task of maintenance and repair of freight cars is received, which will allow reducing the risk of failure if the task is successfully completed. Practical value. The use of diagnostics of axle boxes of freight cars during maintenance and repair can reduce the risk of failure by 2… 4.5 times.

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

Cited by 3 publications

References 18 publications

Determination of the thermal stress state for the composite brake pad of a wagon at operational loads

Determination of the thermal stress state for the composite brake pad of a wagon at operational loads

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

Influence of Maintenance and Repair of Axle Boxes on the Risks of Their Failure

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