scholarly journals Design of track structure for corridors of heavy- train traffic

2018 ◽  
Vol 239 ◽  
pp. 05005 ◽  
Author(s):  
Sergey Kosenko ◽  
Sergey Akimov
Keyword(s):  
Rational Design ◽  
Rolling Stock ◽  
Track Structure ◽  
Structural Elements ◽  
Curve Section ◽  
Axial Loads ◽  
The West ◽  
Rail Track ◽  
Regulatory Documents ◽  
Continuous Welded Rail

The topical issues of the development of heavy-train traffic along the Central Siberian Main from the “Altaiskaya” station to the “Irtyshskoe” station of the West Siberian Railway are considered in this paper. For this purpose, the rational design of the track structure for increased axial loads and side forces was selected and analyzed, and measures to expand the operating domain of the continuous welded rail track by improving the design of sleepers and intermediate rail fasteners without changing the plan and profile of the track were considered. Adjusting the track gauge by surface and line is a critical task. The paper discusses the issues of ensuring the widening of the track gauge in curved sections with a radius of less than 350 m as one of the constraints to the development of the operating domain of the continuous welded rail track on the railways of JSC “Russian Railways” and on the West Siberian Railway. Two main ways of ensuring the widening of the track gauge are considered: by changing the structure of sleepers and by means of additional structural elements of intermediate rail fastenings, or a combination of both. This ensures the smoothness when guiding the rolling stock in the curve section of the track, improves the interaction in the wheel-rail system, reduces wear, and complies with requirements of existing regulatory documents. All this reduces the dynamic load on the track, including the subgrade, and extends the service life of the track structure in conditions of heavy-train traffic.

scholarly journals Assessment of the stability and loading indicators of two-axle mine cars and rail tracks

2020 ◽  
Vol 168 ◽  
pp. 00044
Author(s):  
Volodymyr Hovorukha ◽  
Todor Zhelyazov
Keyword(s):  
Transport Systems ◽  
Movement Speed ◽  
Rolling Stock ◽  
Research Results ◽  
Rail Track ◽  
Regulatory Documents ◽  
Rail Vehicles ◽  
The Stability ◽  
Technical Solutions ◽  
Track Irregularities

The paper presents the research results of the stability and loading of the two-axle mine cars and rail tracks with various design for calculation schemes construction of transport systems of underground rail haulage. The dependences of changes in loading, stability and operation safety of rolling stocks from the parameters of irregularities, curvature radii of the rail track and the movement speed of rolling stocks at various technical solutions of the transport system, have been studied. The research results of the interaction between the two-axle mine cars and rail track with the gauge of 750 mm for underground rail haulage are presented. The parameters have been determined of the rail track irregularities in the horizontal and vertical planes, which cause the highest values of vertical and horizontal loads, acting on the rail track and the two-axle rolling stock. The recommendations are proposed for improving the study of the rail vehicles and regulatory documents development for the construction and operation of the track structure. The results can be applied for the underground rail haulage when creating the new vehicles for mines.

A Dynamic Characteristic Analysis of Continuous Welded Rail Track under Different Longitudinal Stress

2011 ◽  
Vol 105-107 ◽  
pp. 1134-1137
Author(s):  
Yan Yun Luo ◽  
Hu Zhang ◽  
Yan Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Frequencies ◽  
Track Structure ◽  
Longitudinal Stress ◽  
The Finite Element Method ◽  
Rail Track ◽  
Continuous Welded Rail ◽  
The Relationship ◽  
Element Method

The paper presents a dynamic computational model and field test for analyzing the relationship between the rail natural frequencies and the longitudinal temperature stress by means of the finite element method. The essay use the infinite Timoshenko beam as the plane model to simulate continuous welded rail track structure and the rail model by means of the finite element method in order to its unit as a division of space elastomer. The test uses vertical incentive and horizontal incentive to encourage continuous welded rail track structure to get the rail natural frequencies. The measured data and the result of finite element analysis are compared, finds the results are consistent. The paper not only investigates the relationship between the rail’s dynamic characteristics and the longitudinal stress, but also provides a feasible method for test longitudinal stress of continuous welded rail track.

Research on Stability Strengthening Scheme of Continuous Welded Rail on Bridge in the Small Radius Curve Section

2014 ◽  
Vol 505-506 ◽  
pp. 106-110 ◽  
Author(s):  
Biao Wang ◽  
Jin Hui Xu ◽  
Li Wang ◽  
Ping Wang
Keyword(s):  
Stability Problem ◽  
Small Radius ◽  
Track Structure ◽  
Curve Section ◽  
Fem Model ◽  
Continuous Welded Rail ◽  
Small Resistance ◽  
The Stability ◽  
Curve Radius

To solve the stability problem of continuous welded rail (short for CWR) on bridge in the small radius curve section, a sleeper connector structure was proposed, which is used to connect sleepers together and strengthen the stability of CWR. A FEM model was established to study the effect of the CWR stability strengthening scheme. This study result shows that the integrity of the track structure and the stability of CWR in the small radius curve section of which the radius is from 250m to 600m will be both improved by the strengthening scheme, and the larger the curve radius is, the better the CWR stability improvement will be. In order to guarantee the strength of sleeper connector and connecting bolt, it is suggested that the sleeper connectors at beam gaps should not be connected, and small resistance fasteners should be used in strengthening area.

Evolving protocells to prototissues: rational design of a missing link

2013 ◽  
Vol 41 (5) ◽  
pp. 1159-1165 ◽  
Author(s):  
Shiksha Mantri ◽  
K. Tanuj Sapra
Keyword(s):  
Synthetic Biology ◽  
Rational Design ◽  
Structural Elements ◽  
Bottom Up ◽  
Missing Link ◽  
Hierarchical Assembly ◽  
Artificial Cell

Realization of a functional artificial cell, the so-called protocell, is a major challenge posed by synthetic biology. A subsequent goal is to use the protocellular units for the bottom-up assembly of prototissues. There is, however, a looming chasm in our knowledge between protocells and prototissues. In the present paper, we give a brief overview of the work on protocells to date, followed by a discussion on the rational design of key structural elements specific to linking two protocellular bilayers. We propose that designing synthetic parts capable of simultaneous insertion into two bilayers may be crucial in the hierarchical assembly of protocells into a functional prototissue.

A Model of Seawater Structure Near the West Coast of Vancouver Island, British Columbia

1963 ◽  
Vol 20 (4) ◽  
pp. 939-967 ◽  
Author(s):  
Robert K. Lane
Keyword(s):  
British Columbia ◽  
West Coast ◽  
Large Scale ◽  
Coastal Region ◽  
Vancouver Island ◽  
Structural Elements ◽  
The West ◽  
Characteristic Structure ◽  
Oceanographic Data ◽  
Vertical Sections

Oceanographic data collected in a line of stations extending seaward of the west coast of Vancouver Island, British Columbia, were reviewed and analyzed. On the basis of these data and the large-scale meteorological processes of wind, insolation, and precipitation, the characteristic structure of temperature and salinity in the coastal region was denned in five temporal stages throughout the year. These stages are presented as vertical sections along the line with characteristic ranges of values to be found in each of the structural elements.

PUBLISHING PAINS, OR DESIGNING A SCIENTIFIC JOURNAL

2020 ◽  
pp. 32-58
Author(s):  
А.І. Radchenko ◽  
◽  
О.V. Vakarenko ◽  
Т.М. Shenderovych ◽  
◽  
...  
Keyword(s):  
Scientific Journal ◽  
Publishing House ◽  
Title Page ◽  
Scientific Article ◽  
Structural Elements ◽  
National Academy Of Sciences ◽  
Basic Principles ◽  
Regulatory Documents ◽  
Professional Journals ◽  
Academy Of Sciences

The article considers the basic principles of creating a unified template for a scientific journal in accordance with current regulations and rules for creating original layouts, as well as taking into account the experience of specialists of the Publishing House "Akademperiodyka" of the National Academy of Sciences of Ukraine. The list of the basic regulatory documents is given, other useful links are given. The example of a typical unified template shows what the cover and title page of a scientific journal should look like, as well as the imposition page of an article of a scientific professional publication, describes in detail the necessary structural elements of a scientific article and describes their design. The choice of the solutions presented in the unified template is briefly substantiated. The most common mistakes present in domestic scientific professional journals are described. Examples from real magazines illustrate the possible variety of design within a unified template.

Mechanics of Track Structure with Y-Shaped Steel Sleepers in Sharp Curves

2007 ◽  
Vol 9 ◽  
pp. 71-88 ◽  
Author(s):  
Włodzimierz Czyczuła ◽  
Roman Bogacz
Keyword(s):  
Thermal Loading ◽  
Vertical Direction ◽  
Numerical Data ◽  
Radius Of Curvature ◽  
Track Structure ◽  
Basic Part ◽  
Elastic Bodies ◽  
Continuous Welded Rail ◽  
Straight Lines ◽  
Transition Curves

Certain analytical elastic solution for curvilinear track section under uniform thermal loading has been proposed. Track section is composed of circular arc, transition curves and straight lines. Next step is the analysis of two-dimensional model of the track structure (stress plane, without vertical direction). The rails and the sleepers are assumed as elastic bodies. The fasteners and ballast are modeled as elastic-plastic elements. Non-linear properties of these elements are determined by comparison of numerical data with experimental results. Cyclic uniform thermal field is applied as the load of the system. Pre-buckling analysis is the basic part of the considerations. Certain remarks on the track stability, based on the previous author analyses, are also presented. It is shown that track structure with Y-shaped steel sleepers gives the possibility to use of continuous welded rail (CWR) track practically in any radius of curvature.

Metalloligand Strategies for Assembling Heteronuclear Nanocages – Recent Developments

2019 ◽  
Vol 72 (10) ◽  
pp. 731 ◽  
Author(s):  
Feng Li ◽  
Leonard F. Lindoy
Keyword(s):  
Structural Properties ◽  
Metal Ion ◽  
Rational Design ◽  
Building Blocks ◽  
Structural Elements ◽  
Present Discussion ◽  
The Past ◽  
Recent Developments ◽  
Metal Organic ◽  
Multifunctional Ligand

The use of metalloligands as building blocks for the assembly of metallo-organic cages has received increasing attention over the past two decades or so. In part, the popularity of this approach reflects its stepwise nature that lends itself to the predesigned construction of metallocages and especially heteronuclear metallocages. The focus of the present discussion is on the use of metalloligands for the construction of discrete polyhedral cages, very often incorporating heterometal ions as structural elements. The metalloligand approach uses metal-bound multifunctional ligand building blocks that display predesigned structural properties for coordination to a second metal ion such that the rational design and construction of both homo- and heteronuclear metal–organic cages are facilitated. The present review covers published literature in the area from early 2015 to early 2019.

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