A Fast Algorithm for the Simplified Theory of Rolling Contact
TL;DR: An algorithm “Fastsim” for the simplified theory of rolling contact is described which is 15-25 times as fast as the existing programs Simrol (Kalker), and 3 times asfast as Rolcon (Knothe).
Abstract: SUMMARY An algorithm “Fastsim” for the simplified theory of rolling contact is described which is 15-25 times as fast as the existing programs Simrol (Kalker), and 3 times as fast as Rolcon (Knothe). The relative total force computed with Fastsim differs at most 0.2 from that calculated with Simrol, Simcona (Goree & Law), Rolcon, and the “exact” program Duvorol (Kalker). Descriptions and lists of an Algol 60, and HP 67 program version are available upon request: the Fortran IV version is given in the paper.
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TL;DR: In this paper, a comparison of alternative Creep Force Models for rail vehicle dynamic analysis is presented, and the results show that the alternative models are less accurate than the original models in terms of acceleration and acceleration.
Abstract: (1983). A Comparison of Alternative Creep Force Models for Rail Vehicle Dynamic Analysis. Vehicle System Dynamics: Vol. 12, No. 1-3, pp. 79-83.
459 citations
TL;DR: In this article, the authors present a method to simulate various real wheel-rail contact conditions using one parameter set, which can be identified from measurements or the recommended parameters for modelling of typical wheel rail contact conditions in engineering applications.
425 citations
Cites methods from "A Fast Algorithm for the Simplified..."
...Using the contact shear stiffness coefficient C derived from Kalker’s linear theory, the method is used as a simple and fast alternative instead of the FASTSIM computer code [ 11 ] or other methods or precalculated tables....
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TL;DR: In this article, a wheel wear prediction model is developed to predict the wheel profile evolution due to the wear process, which can be used to effectively evaluate maintenance intervals, to optimise wheel and rail profiles with respect to wear and to optimize the railway vehicle's suspensions with new and worn wheel profiles.
281 citations
TL;DR: A fast algorithm and computer code for the computation of wheel-rail forces under known contact geometry and creep and spin conditions is presented and can be used instead of simple formulas to improve the accuracy or as a substitution of Kalker's programme FASTSIM to save the computation time.
Abstract: In the simulations of rail vehicle dynamic behaviour, the computation of wheel-rail forces is repeated many times. Therefore a short calculation time is very important. A fast algorithm and computer code for the computation of wheel-rail forces under known contact geometry and creep and spin conditions is presented in the paper. The proposed method assumes ellipsoidal contact area and normal stress distribution according to Hertz. Because of the short calculation time it can be used instead of simple formulas to improve the accuracy or as a substitution of Kalker's programme FASTSIM to save the computation time. The method has been tested and used in different simulation tools with very good experience. The computer code and some test results given in the appendix allow to apply this method in the user's own computer simulation programmes. For the covering abstract see ITRD E117109.
239 citations
Cites background from "A Fast Algorithm for the Simplified..."
...) (U dy dx F (2) where U - contact area....
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TL;DR: Train-track-bridge dynamic interaction is a fundamental concern in the field of railway engineering, which plays an extremely important role in the optimal design of railway bridges, especially in this article.
Abstract: Train–track–bridge dynamic interaction is a fundamental concern in the field of railway engineering, which plays an extremely important role in the optimal design of railway bridges, especially in ...
222 citations
Cites methods from "A Fast Algorithm for the Simplified..."
...The nonlinear models such as the Shen–Hedrick–Elkinsmodel [86] or theKalker FASTSIMalgorithm [87] should be applied to the calculation of the creep forces of the wheel and the rail under the large and small creepages....
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References
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TL;DR: In this paper, the authors describe the theory of frictional rolling contact as far as it is significant for the wheel-rail system and give a present day account of the simplified theory and the exact linear and non-linear theory.
Abstract: SUMMARY This paper describes the theory of frictional rolling contact as far as it is significant for the wheel-rail system. It is divided into two parts. The first part, mostly non-mathematical, contains a historical survey from the times of Carter and Fromm (1926) to the present day, in which all aspects of rolling contact theory are discussed. Included are a quantitative account of the results of Hertz theory (Section 3), and a table of the creepage and spin coefficients. The second part gives a present day account of the simplified theory (Section 4), and of the exact linear and non-linear theory (Section 5). The paper closes with some recommendations for future research, of which the most pressing is a thorough investigation of the accuracy of simplified theory.
228 citations