Twin disc assessment of wheel/rail adhesion

Gallardo-Hernández, Ezequiel Alberto; Lewis, Roger

doi:10.1016/j.wear.2008.03.020

Cited by 157 publications

(147 citation statements)

References 21 publications

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“…Leaf fall can also cause a lot disturbance to traffic on the network [45]. Research into leaf contamination and low adhesion has been carried out using various methods including actual trains [67], pin-on-disc [58,68], twin-disc [69,70] and ball-on-disc [71] test rigs. A comparison of these tests was discussed in [72], and is shown in Table 4.…”

Section: Wheel-rail Adhesion Under Contaminated Conditionsmentioning

confidence: 99%

“…It was pointed out that with increased thickness of the oxide layer on the railhead surface the friction coefficient reduces [72] although no definitive relationship was found between leaf contamination thickness and the friction levels [64]. [68] GallardoHernandez and Lewis [70] Li et al [69] Cann [71] Arias-Cuevas and Li [67] Test apparatus Pin-on-disc …”

Section: Wheel-rail Adhesion Under Contaminated Conditionsmentioning

confidence: 99%

“…Removal of only the coated slippery layer is not enough to restore friction levels. A number of methods are used to combat adhesion problems due to leaf contamination including: sand [72,80], Sandite (a mixture of sand and aluminum oxide particles), high-pressure water jetting, high-powered lasers [70] and a magnetic track brake [83]. However, leaf contamination on the rail is very localized and the contaminated depth varies.…”

Section: Measures To Improve Wheel-rail Adhesionmentioning

confidence: 99%

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Tribology of the wheel–rail contact – aspects of wear, particle emission and adhesion

Olofsson

Zhu

Abbasi

et al. 2013

Vehicle System Dynamics

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The wheel-rail contact is a safety critical interface. Wear, particle emission and adhesion are all wheelrail contact phenomena and are discussed here. All three phenomena are material and system parameters and are linked together. Different countermeasures to one phenomenon such as adhesion enhancement with a friction modifier can increase the wear in the contacting bodies. The wear of railway wheel and rail are linked to the number of airborne particles generated, but the exact number and size distribution of the aerosols is unknown. The main objective of this study is to review recent work in this field and to discuss future trends.

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Section: Wheel-rail Adhesion Under Contaminated Conditionsmentioning

confidence: 99%

Section: Wheel-rail Adhesion Under Contaminated Conditionsmentioning

confidence: 99%

Section: Measures To Improve Wheel-rail Adhesionmentioning

confidence: 99%

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Tribology of the wheel–rail contact – aspects of wear, particle emission and adhesion

Olofsson

Zhu

Abbasi

et al. 2013

Vehicle System Dynamics

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“…[15,18,22] and artificial friction modifiers [13,16,21,14,20]. The performances of the contaminants have been compared to each other in [19]. Fundamental studies have been carried out through on-track railway tests too by taking into account natural contaminants [12] and artificial friction modifiers [10,11].…”

Section: Introductionmentioning

confidence: 99%

Development of an innovative wheel–rail contact model for the analysis of degraded adhesion in railway systems

Allotta

Meli

Ridolfi

et al. 2014

Tribology International

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a b s t r a c tA detailed description of adhesion is crucial in tribology, vehicle dynamics and railway systems, both theoretically and practically. However, an accurate adhesion model is quite hard to develop because of the complex and non-linear behaviour of the adhesion coefficient and the external unknown contaminants which are present between the contact surfaces. The problem becomes even more complicated when degraded adhesion and large sliding between the contact bodies (for instance wheel and rail) occur.In this paper the authors describe an innovative adhesion model aimed at increasing the accuracy in reproducing degraded adhesion conditions in vehicle dynamics and railway systems; the new approach turns out to be quite suitable also for multibody applications (fundamental in this research topic). The model studied in the work considers some of the main phenomena behind the degraded adhesion: the large sliding at the contact interface, the high energy dissipation, the consequent cleaning effect on the contact surfaces and, finally, the adhesion recovery due to the external unknown contaminant removal.The new adhesion model has been validated through experimental data provided by Trenitalia S.p.A. and coming from on-track tests carried out in Velim (Czech Republic) on a straight railway track characterised by degraded adhesion conditions. The tests have been performed with the railway vehicle UIC-Z1 equipped with a fully-working Wheel Slide Protection (WSP) system.The validation showed the good performances of the adhesion model both in terms of accuracy and in terms of numerical efficiency; high computational performances are required to implement the developed model directly online within more general and complex multibody models (e.g. in MatlabSimulink and Simpack environments). In conclusion, the adhesion model highlighted the capability of well reproducing the complex phenomena behind the degraded adhesion.

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“…More particularly the analyses have been performed both on laboratory test rigs and through on-track railway tests by considering natural and artificial external contaminants and friction modifiers [7,8,16,18,20,24,36,50].…”

Section: Introductionmentioning

confidence: 99%

An innovative degraded adhesion model for railway vehicles: development and experimental validation

2013

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The realistic description of the wheel-rail interaction is crucial in railway systems because the contact forces deeply influence the vehicle dynamics, the wear of the contact surfaces and the vehicle safety. In the modelling of the wheel-rail contact, the degraded adhesion represents a fundamental open problem. In fact an accurate adhesion model is quite hard to be developed due to the presence of external unknown contaminants (the third body) and the complex and highly non-linear behaviour of the adhesion coefficient; the problem becomes even more complicated when degraded adhesion and large sliding between the contact bodies (wheel and rail) occur.In this work the authors describe an innovative adhesion model aimed at increasing the accuracy in reproducing degraded adhesion conditions. The new approach has to be suitable to be used inside the wheelrail contact models usually employed in the multibody applications. Consequently the contact model, comprising the new adhesion model, has to assure both a good accuracy and a high numerical efficiency to be implemented directly online within more general ve- The model studied in the work considers some of the main phenomena behind the degraded adhesion: the large sliding at the contact interface, the high energy dissipation, the consequent cleaning effect on the contact surfaces and, finally, the adhesion recovery due to the external unknown contaminant removal.The new adhesion model has been validated through experimental data provided by Trenitalia S. p. A. and coming from on-track tests carried out in Velim (Czech Republic) on a straight railway track characterised by degraded adhesion conditions. The tests have been performed with the railway vehicle UIC-Z1 equipped with a fully-working Wheel Slide Protection (WSP) system.The validation showed the good performances of the adhesion model both in terms of accuracy and in terms of numerical efficiency. In conclusion, the adhesion model highlighted the capability of well reproducing the complex phenomena behind the degraded adhesion.

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Twin disc assessment of wheel/rail adhesion

Cited by 157 publications

References 21 publications

Tribology of the wheel–rail contact – aspects of wear, particle emission and adhesion

Tribology of the wheel–rail contact – aspects of wear, particle emission and adhesion

Development of an innovative wheel–rail contact model for the analysis of degraded adhesion in railway systems

An innovative degraded adhesion model for railway vehicles: development and experimental validation

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