Simulation of the railway under dynamic loading. Part 1. Ray method for dynamic problem

Loktev, Alexey; Гридасова, Е. А.; Zapol’nova, Evgeniya V.

doi:10.12988/ces.2015.57204

Cited by 18 publications

(3 citation statements)

References 12 publications

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“…The second approach is based on the study of a single-layer structure, for which anisotropic properties in different directions of anisotropy are considered. In fact, changing the mechanical characteristics of the material allows one to model inhomogeneous media using these values [29][30][31][32][33]. In both cases the governing equations must be supplemented with boundary conditions on the faces and contacting surfaces.…”

Section: Methodsmentioning

confidence: 99%

The influence of anisotropic properties of the under-rail base on the track dynamic settlement

Fazilova,

Egereva

2024

E3S Web Conf.

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The article presents the results of a study of the anisotropy of the under-rail base on the dynamic settlement of sections of transitional stiffness reinforced with bottomless boxes. It is proposed to model the railway track by flat elements, each of which is represented by an anisotropic plate resting on a deformable base with its own deformability parameters. Three main directions of change in the mechanical and geometric characteristics of the structure are identified: horizontal directions along the rail strands, transverse directions along the sleepers, and vertical directions down from the level of the rail head. Setting boundary conditions for individual fragments of the track structure and varying the anisotropy coefficients allows to achieve a good correspondence between the real railway track structure and its mathematical model. Graphical dependencies for the vertical displacement of points on the median surface of a flat element modeling a segment of a railway track were constructed and analyzed based on the results of determining the frequencies of natural oscillations.

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Section: Methodsmentioning

confidence: 99%

The influence of anisotropic properties of the under-rail base on the track dynamic settlement

Fazilova,

Egereva

2024

E3S Web Conf.

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“…Если заменить бесконечный протяжённый плоский элемент на пластину с конечными размерами, то к описанным уравнениям можно добавить краевые условия по граням, в этом случае можно получить характеристическое уравнение относительно частот собственных колебаний . Варьируя параметры A i и приводя их в соответствие с геометрическими и механическими характеристиками реальной конструкции железнодорожного пути, можно получить не только математическое решение инженерной задачи деформирования верхнего строе-ния пути под подвижной динамической нагрузкой, но и апробировать различные элементы и процедуры технологических процессов содержания железнодорожного пути [29][30] .…”

Section: скорость поперечной волны;unclassified

The Impact of Anisotropic Properties of the Rail Track Superstructure on the Parameters of Dynamic Settlement of Bridge Approaches

Fazilova

2023

Mir transp.

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Numerous artificial structures, bridges, overpasses, tubes, channels, chutes are operated on railway networks. Artificial structures are considered to have a longer life cycle and thus will need during it overhaul and reconstruction with the use of modern technology. Currently, there is an increase in axial load and traffic speed, the makes even more relevant the solution of tasks referring to dynamic impact of trains on artificial structures and superstructure. See the features of construction and maintenance of rail track sections at the approaches to bridges, the respective problems merit special consideration.The research which results are presented in the article was dedicated to the impact of the anisotropy of the track superstructure on the parameters of the dynamic settlement of sections of transitional stiffness located at the approaches to bridges and built using bottomless box culverts.The research proposed to model the railway track within the transitional section as a set of flat elements of constant thickness, while each of them is regarded as a anisotropic plate supported by deformable foundation with its own deformability rates. By setting boundary conditions for individual fragments of the track structure and varying the anisotropy coefficients that determine the ratio of mechanical characteristics in different directions of anisotropy, it is possible to select necessary rail track stiffness rates for a section at bridge approaches, that paves the way to further research on structural features of designing and arrangement of those structures.

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“…The goal of the research is to check the local strength of the slab undergoing shock impact, as well as to study its influence on the dynamic deflection of the plate. The effect on contact force of the cylindrical anisotropy and on the initial velocity of interaction impact was also studied, the rigidity conditions of the plate was checked [17,18,19]. The problems of transverse axisymmetric impact of a solid body on an orthotropic plate with cylindrical anisotropy are solved [20,21,22].…”

Section: Research Techniquementioning

confidence: 99%

Dynamic behavior model of the ballastless railroad track segment considering wave processes

et al. 2020

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The paper is devoted to the modification of the dynamic behavior model of a flat orthotropic element under shock and vibrational impacts. The impacts were caused by solid cylindrical body for the case of ballastless railway construction. The suggested model allows simulating the element deformation in the upper structure of the ballast-free design track. The propagation of elastic waves moving with finite speeds, orthotropic properties of the foundation slab, which allow optimally selecting rod reinforcement are taken into account. The obtained analytical and graphical results make it possible to assess the influence of properties of the reinforced concrete slab, the underframe speed, the presence of defects in wheel sets or rail bars, as well as the characteristics of the technical content of the track section.

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Simulation of the railway under dynamic loading. Part 1. Ray method for dynamic problem

Cited by 18 publications

References 12 publications

The influence of anisotropic properties of the under-rail base on the track dynamic settlement

The influence of anisotropic properties of the under-rail base on the track dynamic settlement

The Impact of Anisotropic Properties of the Rail Track Superstructure on the Parameters of Dynamic Settlement of Bridge Approaches

Dynamic behavior model of the ballastless railroad track segment considering wave processes

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