Modelling of Friction Coefficient for Shoes Type LL By Means of Polynomial Fitting

Cantone, L

doi:10.2174/18744478018120100114

Cited by 13 publications

(11 citation statements)

References 5 publications

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“…In contrast to the model of Karwatzki, which is a single formula with five parameters , the model of Gralla consists of four terms , , and , depending on initial and instantaneous velocity, friction work and brake type. Another approach originating from tread brakes is the use of polynomial regression depending on the velocity suggested by Cantone in [3]. In this work two methods are presented in which the parameters are fitted to datasets with varying normal forces and initial velocity.…”

Section: Modelmentioning

confidence: 99%

“…Another approach originating from tread brakes is the use of polynomial regression depending on the velocity suggested by Cantone and Ottati. 3 In this work two methods are presented in which the parameters a i are fitted to datasets with varying normal forces and initial velocity. Although, the frictional behavior in tread brakes varies stronger than in disc brakes during braking, 16 the models of Gralla, Karwatzki and Cantone are also applied for the friction coefficient of disc brakes.…”

Section: Modelling Approaches For Disc Brakesmentioning

confidence: 99%

“…Different empirical approaches have been proposed in Refs. [3][4][5] to estimate the instantaneous friction coefficient of railway vehicles based on numerical simulation. With the exception of Lee and Kang, 5 however, these approaches have their origin in the analysis of railway tread brakes and not disc brakes.…”

Section: Introductionmentioning

confidence: 99%

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Identification of a dynamic friction model for railway disc brakes

Ehret

2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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Braking forces occurring during emergency brake applications of passenger trains are generated by disc brake units. The acting friction forces depend on the frictional properties between disc and brake pad and are influenced by relative velocity, temperatures and normal pressure of the contacting surfaces. In this work a mathematical model is developed which aims to link these influencing variables to the instantaneous acting friction coefficient in order to include the characteristic behavior of friction forces in the calculation of longitudinal dynamics of railway vehicles. The model is identified by the use of data recorded on a full-scale dynamometer test rig and verified regarding the estimation of the brake distance.

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Section: Modelmentioning

confidence: 99%

Section: Modelling Approaches For Disc Brakesmentioning

confidence: 99%

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Identification of a dynamic friction model for railway disc brakes

Ehret

2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Since the number wagons equipped with composite brake blocks type LL and K is increasing in the last years, the original version of TrainDy software has been enriched with the modules to handle these types of wagons, described in [20]- [21].…”

Section: Figure 1 Pictorial Representation Of the Random Process To Generate Virtual Trainsmentioning

confidence: 99%

Methodology to Admit New Freight Trains to International Traffic According to the Uic

Cantone¹,

Durand²,

Karbstein³

2020

International Journal of Mechanical Engineering and Technology (Ijmet)

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Current version of UIC Leaflet 421 provides a methodology based on statistical analysis to accept train compositions whose limits exceeds 2500t and 700m (locomotives excluded), for international traffic. This methodology does not consider explicitly trains with distributed traction/braking and their most relevant degraded modes. The paper shows a more general methodology to build statistically virtual trains, considering boundaries in terms of both train mass and length. The UIC approved TrainDy software can compute the longitudinal train dynamics (LTD) of these trains efficiently and accurately. The paper applies the new UIC Leaflet 421 to trains with distributed power and braking where the Traction Units (TU) communicate by means of GSM-R radio. Results show that in-train forces for 1500m train, heterogeneously loaded, carrying up to 4800t, with four TU, are similar to those of already running trains, at least in nominal mode, i.e. when there is a proper communication between the TU.

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“…In the European Union, freight trains are mainly equipped with block braking systems. In 75% of wagons cast iron is used as the friction material, which generates significant noise during braking 1 , 2 . Regulations in the European Union concerning the reduction of noise levels 3 , 4 are forcing the accelerated replacement of cast iron brake blocks with organic composite brake blocks.…”

Section: Introductionmentioning

confidence: 99%

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Yevtushenko

Kuciej

Grześ

et al. 2022

Sci Rep

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The article presents finite element models of the 2xBgu type tread brake for the simulation of extended repeated frictional heating carried out on a full-scale inertia dynamometer. The numerical calculations were conducted for the brake blocks made of two organic composite materials newly developed specifically for this study. The transient temperature changes obtained from the 2D axisymmetric and 3D finite element analyses and experimental data agreed well during continuous process of about 1200 s. Simulation of such a long period of braking sequence required introducing simplifications in the boundary conditions in the contact area, convection cooling, arrangement of the model (2D axisymmetric, 3D). The focus was laid on representation of variation of the coefficient of friction and the temperature dependence of the properties of the friction materials during braking. The carried out research indicates limitations in the finite element analysis and directions of necessary improvements in modelling as well as measurements with the use of embedded thermocouples.

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Modelling of Friction Coefficient for Shoes Type LL By Means of Polynomial Fitting

Cited by 13 publications

References 5 publications

Identification of a dynamic friction model for railway disc brakes

Identification of a dynamic friction model for railway disc brakes

Methodology to Admit New Freight Trains to International Traffic According to the Uic

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

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