Statistical Processing of Brake Pads Wear Parameters of Freight Cars

Ravlyuk, Vasyl; Ravliuk, M.; Kirichenko, I.K.

doi:10.15802/stp2020/203103

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…The model of wear of the geometric dimensions of wagon brake pads was applied as a statistical function. In this case, the density function f(x), for random wear values of x pads, was determined as follows [6,[23][24][25]:…”

Section: = +mentioning

confidence: 99%

“…Figure 6 shows the λ-characteristics and the empirical estimates of wear on the top and bottom of the brake pads of wagons [6].…”

Section: = +mentioning

confidence: 99%

“…The estimate of the µ-characteristics of the average residual service life [6,[23][24]26] has significantly lower random fluctuations than the estimate of the µ-characteristics calculated using the same parameters.…”

Section: = +mentioning

confidence: 99%

“…For this model, the squared asymmetry is a function of the two variables, and has the following form [6,21]:…”

Section: = +mentioning

confidence: 99%

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The Service Life Prediction for Brake Pads of Freight Wagons

Panchenko,

Gerlici,

Lovska

et al. 2024

Communications

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The analysis of the statistical values of wear of brake pads in operation, based on which a wear model was developed, is presented in this paper. This model can be used for predicting the remaining service life of brake pads according to the wagon mileage. The distribution function of wear on the upper and lower parts of the pad was determined, which made it possible to find the main qualitative characteristics, namely, the wear intensity, the c -percentage wear, and the average pad wear at a specified wagon mileage. The results of the study can be factored for solving complex engineering problems of excessive wear of composite brake pads used for freight rolling stock; they could also help to extend the guaranteed overhaul period and improve the railway traffic safety.

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Section: = +mentioning

confidence: 99%

“…Figure 6 shows the λ-characteristics and the empirical estimates of wear on the top and bottom of the brake pads of wagons [6].…”

Section: = +mentioning

confidence: 99%

Section: = +mentioning

confidence: 99%

“…For this model, the squared asymmetry is a function of the two variables, and has the following form [6,21]:…”

Section: = +mentioning

confidence: 99%

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The Service Life Prediction for Brake Pads of Freight Wagons

Panchenko,

Gerlici,

Lovska

et al. 2024

Communications

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“…Under the conditions of temperature conditions, the maximum pressure K t k , kN for composite pads during the thermal regime in the braking process can be found from the expression [31,32]:…”

Section: Engineeringmentioning

confidence: 99%

Studying the load of composite brake pads under high-temperature impact from the rolling surface of wheels

Panchenko,

Gerlici,

Vatulia

et al. 2023

Eureka: PE

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The object of the research is the processes of thermal stress, perception and redistribution of loads by the brake composite pad during braking of the car in operation. In the current conditions, wedge-dual wear of composite brake pads is observed in the braking systems of freight cars, the feature of which is the deterioration of the braking efficiency of freight trains. With this type of wear, both an increase in the load on the brake pad and an "underuse" of the amount of pressure on it can occur. A comprehensive thermal calculation was carried out for composite brake pads with uniform and wedge-dual wear. The results of the calculation showed that the amount of pressure on an abnormally worn pad is 23.3 % less than that acting on a pad with nominal values. It has been proven that the change in the pressure force on the composite pad with different values of the wear parameters during braking leads to a change in the braking force that occurs between the wheel and the rail during braking. The calculation of the strength of the composite brake pad with wedge-dual wear was carried out. The obtained results will make it possible to develop measures to modernize the elements of the brake lever transmission of freight cars. The field of practical use of the obtained results is car-building enterprises. The conditions for the practical use of the results are the brake lever transmissions of carriages of cars with a gauge of 1520 mm. The conducted studies prove the negative impact of wedge-dual wear not only on braking efficiency, but also on the strength of brake pads. This makes it necessary to create measures aimed at its elimination, which will contribute to increasing the level of train traffic safety and significantly reducing the operational costs of maintaining freight cars

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Probability and Statistical Model of Wearing of Brake Pads of Freight Cars

Ravliuk¹,

Ravliuk²,

Kyrychenko³

et al. 2021

STP

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Purpose. This study aims to use linear models to determine the wear of brake pads of freight cars at the top and bottom for further use in solving similar practical problems. Methodology. As a working technique the known approach for controlling linear wear changes of pad parameters depending on freight cars run on a network of Ukrzaliznytsia JSC with the modernized brake levers in real operating conditions is used. Based on the obtained statistical data in the operating conditions, we the consistently found values of the corresponding regression analysis indicators for pad wear at specific points, which are recommended by regulatory documents when performing maintenance in operational units of car facilities for brake systems of freight cars. Findings. A probabilistic-statistical model of brake pad wear is constructed on the basis of experimental data collected in the respective parks of the sorting station during the operation of freight cars. The function of wear distribution for the top and bottom part of a pad by means of which the decision of practical problems is possible is offered. Also for different parts of the brake pad found its γ-percentage and average residual wear. Originality. For the first time for the brake pads of freight cars with modernized devices, the functional dependence of their wear depending on the run of cars on the network of Ukrzaliznytsia JSC was determined. Based on the received dependence the statistical model of pad wear taking into account possibilities of their use before full resource exhaustion is developed. The function of distribution of run of freight cars taking into account pad wear due to which the wear percent at the set run is also defined. Practical value. The results obtained in the work will be taken into account in the future to solve technical problems related to non-standard wear of pads in the brake systems of bogies and increase the service life of freight cars.

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Statistical Processing of Brake Pads Wear Parameters of Freight Cars

Abstract: Наука та прогрес транспорту. Вісник Дніпропетровського національного університету залізничного транспорту, 2020, № 2 (86) Creative Commons Attribution 4.

Cited by 5 publications

References 11 publications

The Service Life Prediction for Brake Pads of Freight Wagons

The Service Life Prediction for Brake Pads of Freight Wagons

Studying the load of composite brake pads under high-temperature impact from the rolling surface of wheels

Probability and Statistical Model of Wearing of Brake Pads of Freight Cars

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