Temperature in the railway disc brake at a repetitive short-term mode of braking

Yevtushenko, A.A.; Kuciej, М.; Grześ, Piotr; Wasilewski, Piotr

doi:10.1016/j.icheatmasstransfer.2017.04.007

Cited by 33 publications

(31 citation statements)

References 18 publications

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“…The threedimensional (3D) FE simulations require taking into account mutual sliding of the disc over the stationary pads. The numerical model of the brake pads and the ventilated disc during repeated cycles of braking was developed by Yevtushenko et al 12 The obtained temperatures before the succeeding brake applications, as well as the temperature changes in the disc and on its working surface, were consistent with the results of analytical calculations and experimental data from the article by Ginsburg et al 13 in the entire process of nine braking applications.…”

Section: Uncoupled Problemssupporting

confidence: 62%

“…31,32 The obtained results of the specific point on the contact surface of the disc (r = 95 mm, u = 0, z = 0) will be compared with the corresponding temperature T u of numerical calculations at constant thermal conductivities K d, p , specific heat capacities c d, p , coefficient of friction f and the contact pressure p. 4 The location (r = 95 mm, u = 0, z = 0) was chosen according to the computations carried out in the article by Adamowicz. 4 Verification of the presented modelling of the frictional heating process is also the finite element analysis of temperature field of the ventilated brake disc proposed in the article by Yevtushenko et al, 12 where, it was shown that at each out of nine braking cycles, the temperature from numerical calculations using heat partition coefficient and constant operating parameters corresponded with the experimental data from the article by Ginsburg et al 13 All the outcomes from this study, shown in Figures 3-9, are denoted with solid lines, whereas curves marked in dashed lines are taken from the article by Adamowicz. 4 According to equation (1), contact pressure has a known exponential time profile for each out of 10 braking applications, whereas velocity has been found from the solution of the boundary value of the heat conduction problem and the initial value problem for the motion equation.…”

Section: Computational Scheme and Numerical Analysismentioning

confidence: 99%

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Maximum temperature of the disc during repeated braking applications

Grześ

2019

Advances in Mechanical Engineering

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A computational finite element model of a brake disc for determining transient axisymmetric (two-dimensional) temperature field during repeated brake application has been proposed. The presented research is a subsequent stage of a previous study on the coupling of velocity and maximum temperature for a single braking in accordance with the system of equations of heat dynamics of friction and wear. In the analysed case, changes in the mean, flash, maximum and bulk temperature of the disc were determined and discussed. The calculations were carried out at the temperaturedependent coefficient of friction, the thermophysical properties of cast-iron disc combined with cermet brake pads and the time-varying contact pressure. The obtained results were compared with the reference values from the braking simulation at constant operating parameters and independent of temperature properties of materials. It was shown that the maximum values of the mean temperature for both cases differed slightly during the entire process. The flash temperature determined from the heat dynamics of friction and wear system of equations was the highest at the beginning and gradually decreased with the number of brake applications.

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Section: Uncoupled Problemssupporting

confidence: 62%

Section: Computational Scheme and Numerical Analysismentioning

confidence: 99%

Maximum temperature of the disc during repeated braking applications

Grześ

2019

Advances in Mechanical Engineering

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“…Yevtushenko et al [10] proved that the results from measurements agree well with predictions from finite element method (FEM) simulations of brake discs. Grzes et al [11] proposed a numerical-experimental scheme for the analysis of temperature in a railway braking system based on FEM model results, which included brake disc-brake pad contact surfaces and interface heat distribution.…”

Section: Introductionmentioning

confidence: 76%

Numerical optimisation and experimental validation of divided rail freight brake disc crown

2018

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In this study, numerical optimisation and experimental validation of a divided rail freight brake disc crown made of grey cast iron EN-GJL-250 is presented. The analysed brake disc is used in rail freight wagons and possesses a load capacity of 22.5 tons per axle. Two of the divided rail freight brake discs are mounted on each axle. With the aid of numerical analysis, the thermal dissipation properties of the brake disc were optimised and ventilation losses were reduced, and the numerical results were compared with experimental results. A one-way fluid-structure interaction analysis was performed. A computational fluid dynamic model of a divided rail freight brake disc, used to predict air flow properties and heat convection, was incorporated into a finite element model of the disc and used to evaluate the temperature of the disc. A numerical parametrical optimisation of cooling ribs of the brake disc was also performed, and novel optimised cooling ribs were developed. A transient thermal numerical analysis of the brake disc was validated using temperature measurements obtained during a braking test on a test bench. The ventilation losses of the brake disc were measured on a test bench specifically designed for the task, and the losses were compared to the simulation results. The experimentally obtained ventilation losses and temperature measurements compared favourably with the simulation results, confirming that this type of simulation process may be confidently applied in the future. Through systematic optimisation of the divided rail freight brake disc, ventilation losses were reduced by 37% and the mass was reduced by 21%, resulting in better thermal performance that will bring with it substantial energy savings.

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“…This type of research is important because conventional measure-ments are extremely difficult or quite impossible in some cases (e.g., in the friction pair). Using a computer, researchers are able to determine exactly how the temperature is distributed both in the disc and in the brake pad (Adamowicz, 2017;Grzes, 2017;Talati and Jalalifar, 2009), and they can also change the starting conditions of the test, such as the car's speed during braking, or the clamping force between the friction surfaces (Yevtushenko et al, 2017;Yevtushenko and Grześ, 2015a;Yevtushenko and Grześ, 2016). Unfortunately, due to the reasons described earlier, the results of simulations are difficult to verify experimentally.…”

Section: Tab 3 Main Advantages and Disadvantages Of Inertia Dynamommentioning

confidence: 99%

Common Methods in Analysing the Tribological Properties of Brake Pads and Discs – A Review

Borawski

2019

Acta Mechanica Et Automatica

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Disc brakes in passenger cars are extremely important due to safety concerns. Their operational quality largely rests on the conditions of contact between the working elements, which mainly consists offlat and dry sliding. The tribological phenomena thatoccur during braking are, unfortunately, extremely complex and difficult to recreate in laboratory settings. Many scientific institutes conduct research to improve our understanding of these phenomena. The results they present make it possible to continuously simplify the procedures for selecting friction materials and reducing the costs of identifying the properties of new products. This article analyses the methods commonly used by researchers. It also presents different set-ups of research stations, as well as the advantages and drawbacks of each method.

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Temperature in the railway disc brake at a repetitive short-term mode of braking

Cited by 33 publications

References 18 publications

Maximum temperature of the disc during repeated braking applications

Maximum temperature of the disc during repeated braking applications

Numerical optimisation and experimental validation of divided rail freight brake disc crown

Common Methods in Analysing the Tribological Properties of Brake Pads and Discs – A Review

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