A Fast Algorithm for the Simplified Theory of Rolling Contact

Kalker, J. J.

doi:10.1080/00423118208968684

Cited by 829 publications

(487 citation statements)

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“…Recent extensions of CONTACT [Vollebregt 2014] include the implementation of a falling friction law and the implementation of an elastic interfacial layer. Likewise, in the simplified theory of rolling contact, which is implemented in the algorithm FASTSIM [Kalker 1982], the influence of water can be considered by adjusting the coefficient of friction in terms of BL. Spiryagin [Spiryagin 2013] extended the FASTSIM algorithm by a variable contact flexibility and a slip dependent friction law to allow a better reproduction of measured creep curves.…”

Section: Existing Creep Force Models Taking the Effect Of Water Into mentioning

confidence: 99%

Wheel-rail creep force model for predicting water induced low adhesion phenomena

Trummer

Buckley-Johnstone

Voltr

et al. 2017

Tribology International

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Section: Existing Creep Force Models Taking the Effect Of Water Into mentioning

confidence: 99%

Wheel-rail creep force model for predicting water induced low adhesion phenomena

Trummer

Buckley-Johnstone

Voltr

et al. 2017

Tribology International

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“…More particularly, four different contact models (always implemented directly online within the multibody model of the vehicle) have been considered. All the contact models share the same contact point detection algorithm [10,22,34] and the solution of the normal problem [6,11,29] while, as regards the tangential contact problem, the following options have been taken into account: the global Kalker theory saturated through the Johnson-Vermeulen formula [28,29], the Kalker FASTSIM algorithm [29,30], the Polach model [38,39] and the new degraded adhesion model. As the results summarised in Table 8 show, the numerical efficiency of the new degraded adhesion model is substantially the same of the other wheel-rail contact models that do not consider degraded adhesion conditions.…”

Section: Computational Timesmentioning

confidence: 99%

“…Finally, concerning the solution of the tangential problem, different strategies have been considered in the last decades [14,45]. The most significant approaches include the linear Kalker theory (saturated through the JohnsonVermeulen formula) [19,21,[28][29][30], the non-linear Kalker theory implemented in the FASTSIM algorithm [25-27, 29, 30, 32, 53, 54] and the Polach theory [38][39][40][41] that allows the description of the adhesion coefficient decrease with increasing creepage (excluding the spin creepage) and to well fit the experimental data. All the three steps of the contact model have to assure a good accuracy and, at the same time, a high numerical efficiency.…”

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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“…Modelling and numerical simulation of mechanical systems with frictional contacts in their general case require discretization of the deformable contacting bodies near the contact zone or at least discretization of the contact surface [1][2][3]. For the rolling contact one can use the well-known CONTACT software [2].…”

Section: Introductionmentioning

confidence: 99%

“…Space discretization and use of finite element methods lead, however, to high computational costs and long times of numerical simulations that are not always acceptable. It is the reason of the development of simplified models and algorithms [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Rolling resistance modelling in the Celtic stone dynamics

Awrejcewicz

Kudra

2018

Multibody Syst Dyn

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In the work there is presented a mathematical model of a rattleback lying on a horizontal plane, with special attention paid to modelling of the contact forces. Friction force modelling concerns a certain class of problems, where it is possible to assume fully developed sliding on the contact zone. The models are based on the integral expressions assuming the classical Coulomb friction law valid at each point of the contact. In order to obtain a higher simulation speed, a special class of approximations if integral functions is used, being some kind of generalization of Padé expansion. The rolling resistance is modelled as a result of special distortion of contact pressure distribution and takes into account the rolling direction and the elliptic shape of the contact. The work uses previous results of the authors, but more attention is paid to the rolling resistance model, which is extended and analysed in more detail. The models are validated experimentally and their various elements are tested.

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A Fast Algorithm for the Simplified Theory of Rolling Contact

Cited by 829 publications

References 1 publication

Wheel-rail creep force model for predicting water induced low adhesion phenomena

Wheel-rail creep force model for predicting water induced low adhesion phenomena

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

Rolling resistance modelling in the Celtic stone dynamics

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