Transient wheel–rail adhesion characteristics under the cleaning effect of sliding

Voltr, Petr; Lata, Michael

doi:10.1080/00423114.2014.961488

Cited by 44 publications

(49 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, HPT tests are extremely useful to investigate the behavior of different third body layers, the influence of different surface conditions, as well as the reduction of the initial gradient of the creep curve. (Ultra) low adhesion conditions have not yet been found in HPT testing, however, the absolute value of maximum adhesion under dry conditions is higher in HPT testing than those measured on a tram wheel rig [17].…”

Section: Discussionmentioning

confidence: 80%

Assessing the impact of small amounts of water and iron oxides on adhesion in the wheel/rail interface using High Pressure Torsion testing

Buckley-Johnstone

Trummer

Voltr

et al. 2019

Tribology International

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 80%

Assessing the impact of small amounts of water and iron oxides on adhesion in the wheel/rail interface using High Pressure Torsion testing

Buckley-Johnstone

Trummer

Voltr

et al. 2019

Tribology International

View full text Add to dashboard Cite

“…The saved files are converted to physical quantities based on the calibration measurement defined for the experiment. 9 The measured data are affected by periodic and random parasitic disturbance because of imperfections in the test stand. To minimize the effects of such disturbance, a correct moving average filter is used.…”

Section: Methodsmentioning

confidence: 99%

An adaptive sliding mode control to stabilize wheel slip and improve traction performance

Zirek

Voltr

Lata

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

Self Cite

View full text Add to dashboard Cite

Advanced antislip control methods are available these days. However, due to increasing requirements with regard to demand and emerging technologies in the field of railways, further research on antislip control is required. Therefore, in this study, an antislip control algorithm, based on a sliding mode control, is proposed to stabilize the slip and improve the traction ability of a full-scale tram wheel test stand. To verify the validity of the control scheme, a numerical model of a tram wheel test stand has been generated using the MATLAB editor. The Freibauer and Polach contact theory has been employed to determine the coefficient of adhesion and adhesion force. Moreover, the derived algorithm was implemented on a full-scale tram wheel test stand. Experiments were carried out under several wheel-roller surface conditions. The results of the refined numerical model are in good agreement with the experimental data obtained from the tram wheel test stand. For both the experimental tests and the numerical model, the response of the proposed control algorithm is rather satisfactory with regard to the stabilization of the slip and improvement of the traction ability.

show abstract

“…A torque sensor located on the rail roller axis is used to measure the torque as a result of the wheel-roller contact throughout testing. Further detail on the test rig can be found in previously published literature [12]. The torque motor is capable of applying up to 850 Nm of torque in braking or traction (equivalent to a 2.4 kN friction force).…”

Section: Test Apparatusmentioning

confidence: 99%

Full-scale testing of low adhesion effects with small amounts of water in the wheel/rail interface

Buckley-Johnstone

Trummer

Voltr

et al. 2020

Tribology International

View full text Add to dashboard Cite

Low adhesion in the wheel/rail contact can be caused by small amounts of water combining with iron oxides. This happens in light rain or at dew point. In small-scale tests, ultra-low adhesion (≤0.05) has not been maintained. The aim here was to see if the mechanism could be realized at a larger scale. Sustained ultra-low adhesion was achieved when water was applied constantly to the wheel/rail contact at a rate of 25µL/s. In these conditions wear debris and oxide was clearly visible in the contact band. Creep force data has been generated that can now be used to inform wheel/rail contact models and multi-body dynamics simulations of train behaviour with a view to developing mitigation.

show abstract

Transient wheel–rail adhesion characteristics under the cleaning effect of sliding

Cited by 44 publications

References 29 publications

Assessing the impact of small amounts of water and iron oxides on adhesion in the wheel/rail interface using High Pressure Torsion testing

Assessing the impact of small amounts of water and iron oxides on adhesion in the wheel/rail interface using High Pressure Torsion testing

An adaptive sliding mode control to stabilize wheel slip and improve traction performance

Full-scale testing of low adhesion effects with small amounts of water in the wheel/rail interface

Contact Info

Product

Resources

About