Mathematical Model of New Type of Train Buffer Made of Polymer Absorber—Determination of Dynamic Impact Curve for Different Temperatures

Mickoski, Hristijan; Mickoski, Ivan; Djidrov, Marjan; Zdraveski, Filip

doi:10.3390/machines6040047

Cited by 3 publications

(2 citation statements)

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“…The study of the longitudinal train dynamics (LTD) of long freight trains is of utmost importance to predict the speeds reached by the train and the in-train forces. The increase in the length of freight trains in recent years, in fact, has generated an increase in the in-train forces, 1 which can lead to disastrous consequences such as the breakage of the coupling elements or the derailment of the train caused by excessive tensile and compressive forces, respectively. [2][3][4] LTD is strongly affected by the type of coupling element adopted for vehicle connections.…”

Section: Introductionmentioning

confidence: 99%

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The influence of resistant force equations and coupling system on long train dynamics simulations

Bosso

Magelli

Bartoli

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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In the simulation of the longitudinal dynamics of long trains, the modeling of the resistant forces and of the coupling system are two essential aspects. The modeling of the resistant forces directly affects the speed reached by each vehicle as well as the in-train forces. A literature review witnesses different laws for the calculation of both ordinary and accidental resistances. One of the objectives of this paper is to evaluate from the numerical point of view the influence of the resistant forces modeling strategy on the simulation outputs, i.e., on the speeds and in-train forces, by comparing different laws for propulsion and curving resistances. For what concerns the connection between the vehicles of the train, it is well known that the connection system is of utmost importance for the safety and running stability of the train. In this paper, the two existing coupling systems, i.e., the European buffer-hook system and the coupler used outside the European continent are first described, both in terms of operation and modelling techniques, and then they are compared on the same simulation scenario. All the simulations are performed on the first scenario of the International benchmark of the longitudinal train dynamic simulators, using the LTDPoliTO code developed by the railway research team from Politecnico di Torino.

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Section: Introductionmentioning

confidence: 99%

“…x, € x are respectively the position, the velocity and the acceleration of the vehicle. By applying the balance of forces to each vehicle, see equation (1), where M v is the total mass of the vehicle, we obtain a system of N non-linear ordinary differential equations, with N total number of vehicles. 10,11…”

Section: Introductionmentioning

confidence: 99%