MECHANICAL INTERACTION OF THE RAIL TRANSPORT CAR AND JOINT IRREGULARITY

2021 ◽  
Vol 113 ◽  
pp. 173-189
Author(s):  
Vladimir SHPACHUK ◽  
Aleksandr CHUPRYNIN ◽  
Tatiana SUPRUN ◽  
Andriy KOVALENKO
Keyword(s):  
Mathematical Model ◽  
Numerical Analysis ◽  
Transport System ◽  
Dynamic Interaction ◽  
Rail Transport ◽  
Mechanical Interaction ◽  
Mechanical Models ◽  
Motion Features

Mechanical models of a transport system “carriage - track” while crossing a joint irregularity are proposed. An investigation was conducted on the peculiarities of static, shock and dynamic interaction between the four-axle car and the track, considering tram wheelsets motion features over joint irregularity. A method to solve the equations of a mathematical model of static, shock and dynamic interaction is developed. Numerical analysis is used to determine deflections of the facing rail under the first sleeper for each phase of motion depending on motion phases, and car load and speed.

Dynamics of Electrical Conduction Field of the Sliding Current Collector

2014 ◽  
Vol 698 ◽  
pp. 258-263 ◽  
Author(s):  
V.S. Deeva ◽  
S.М. Slobodyan
Keyword(s):  
Mathematical Model ◽  
Physical Properties ◽  
Electrical Conduction ◽  
Current Collector ◽  
Contact Layer ◽  
Dynamic Interaction ◽  
Material Behavior ◽  
Mechanical Interaction ◽  
Terminal Pair

The problems of the dynamic interaction of the terminal pair of elements are covered. Physical properties of the material, behavior of their characteristics and the features of mechanical interaction are taken into account. Mathematical model of dynamics of contact layer conductivity fractal destruction for sliding shank of sections contact pairs is created.

scholarly journals Theoretical and numerical analysis of novel COVID-19 via fractional order mathematical model

2021 ◽  
Vol 20 ◽  
pp. 103676
Author(s):  
Amjad Ali ◽  
Muhammad Yasin Khan ◽  
Muhammad Sinan ◽  
F.M. Allehiany ◽  
Emad E. Mahmoud ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Numerical Analysis ◽  
Fractional Order ◽  
Theoretical And Numerical Analysis

The Numerical Analysis of the Velocity and Pressure Distribution of the Oil Film in Heavy Hydrostatic Thrust Bearing

2014 ◽  
Vol 541-542 ◽  
pp. 658-662
Author(s):  
Jian Li ◽  
Yuan Chen ◽  
Yang Chun Yu ◽  
Zhu Xin Tian ◽  
Yu Huang
Keyword(s):  
Mathematical Model ◽  
Numerical Analysis ◽  
Pressure Distribution ◽  
Working Conditions ◽  
Thrust Bearing ◽  
Rotation Speed ◽  
The Other ◽  
Surface Load ◽  
Oil Film ◽  
Volume Method

To study the velocity and pressure distribution of the oil film in a heavy hydrostatic thrust bearing, a mathematical model of the velocity is proposed and the finite volume method (FVM) has been used to simulate the flow field under different working conditions. Some pressure experiments were carried out and the results verified the correctness of the simulation. It is concluded that the pressure distribution varies small under different rotation speed when the surface load on the workbench is constant. But the velocity of the oil film is influenced greatly by the rotation speed. When the rotation speed of the workbench is as quick as enough, the velocity of the oil film on one radial side of the pad will be zero, that is to say the lubrication oil will be drained from the other three sides of the recess.

Experimental and Numerical Analysis for Two Kinds of Impact Vibration of Gear

2011 ◽  
Vol 141 ◽  
pp. 43-48 ◽  
Author(s):  
Lin Yu Su ◽  
Yi Qiang Sun ◽  
Jian Ming Wen
Keyword(s):  
Numerical Analysis ◽  
Experimental Analysis ◽  
Dynamic Responses ◽  
Elastic Model ◽  
Motion Equations ◽  
Elastic Boundary ◽  
Mechanical Models ◽  
Impact Vibration ◽  
Dynamic Bifurcation ◽  
Impact Models

In this paper, there are two kinds of impact vibration models: rigid impact model and elastic model. The dynamic responses of the two kinds of gear impact models are compared by experimental and numerical analysis. Firstly, establish the motion equations of the two models. Secondly, verify the correctness of the mechanical models through experimental analysis. Comparing the results of the numerical and experimental analysis, we can find that the intensity noise of gear vibration is reduced by the elastic boundary. Finally, the dynamic bifurcation characteristic of dimensionless excitations magnitude and backlash will be analyzed as well.

Rail Transport Corridors of the Organisation for Co-operation of Railways

2021 ◽  
Vol 65 (191) ◽  
pp. 65-73
Author(s):  
Mirosław Antonowicz
Keyword(s):  
Emerging Markets ◽  
Transport System ◽  
Freight Transport ◽  
Continuous Operation ◽  
Rail Transport ◽  
Operational Parameters ◽  
Member States ◽  
One Belt One Road ◽  
Global Transport ◽  
International Transport

International transport corridors are part of the global transport system and are an important part of the activities of the Organisation for Co-operation of Railways2. The development activities in the Eurasian space are aimed at modernising and developing rail transport by upgrading the technical and operational parameters of the corridors in order to improve the competitiveness of railways in freight transport in Asia and Europe. These corridors are widely used to plan and organise the routing of container trains in international traffic between the OSJD member states. Today, nearly 300 container trains are in continuous operation. The aim of the article is to present the activities to date in the development of corridors, their role and importance in rail transport in the area of the member states of the Organisation for Co-operation of Railways. The article presents issues related to the development and freight transport on 13 international rail transport corridors from the Eurasian railway area. New corridor solutions were highlighted, as well as the New Silk Road3 which is part of China’s broader so-called One Belt, One Road Initiative concept. It is a global infrastructure plan developed in China and implemented in more than 100 countries, mainly in countries referred to as emerging markets. Keywords: international transport corridor, rail transport corridor, indicators for transport corridors, New Silk Road

scholarly journals World Experience in Creating Mathematical Models of Air Springs: Advantages and Disadvantages

2021 ◽  
pp. 25-42
Author(s):  
A. Y Kuzyshyn ◽  
S. A Kostritsia ◽  
Yu. H Sobolevska ◽  
А. V Batih
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Mathematical Models ◽  
Dynamic Behavior ◽  
High Speed ◽  
Vertical Direction ◽  
Rolling Stock ◽  
Air Spring ◽  
Advantages And Disadvantages ◽  
Mechanical Models

Purpose. Taking into account the production and commissioning of modern high-speed rolling stock, the authors are aimed to analyze the currently created mathematical models describing the dynamic behavior of the air spring, systematize them and consider the advantages and disadvantages of each model type. Methodology. For the analysis, a comparative chronological method was used, which makes it possible to trace the development of several points of view, concepts, theories. In accordance with the adopted decision equations, the existing models of air springs were divided into three groups: mechanical, thermodynamic and finite-elements. When analyzing mathematical models, the influence of a number of parameters on the dynamic behavior of the air spring, such as disturbing force frequency, heat transfer, nonlinear characteristics of materials, the shape of the membrane, etc., was considered. Findings. A feature of mechanical models is the determination of input parameters based on the analysis of experimental results, requires access to complex measuring equipment and must be performed for each new model of an air spring separately. Unlike mechanical models, which allow taking into account the damping effect of an air spring in the horizontal and vertical direction, thermodynamic models are mainly focused on studying the dynamic behavior of an air spring in the vertical direction. The use of the finite element method makes it possible to most accurately reproduce the dynamic behavior of an air spring, however, it requires significant expenditures of time and effort to create a finite element model and perform calculations. Originality. Mathematical models of the dynamic behavior of an air spring are systematized, and the importance of their study in conjunction with a spatial mathematical model of high-speed rolling stock is emphasized. Practical value. The analysis of the mathematical models of the dynamic behavior of the air spring shows the ways of their further improvement, indicates the possibility of their use in the spatial mathematical model of the rolling stock in accordance with the tasks set. It will allow, even at the design stage of high-speed rolling stock, to evaluate its dynamic characteristic and traffic safety indicators when interacting with a railway track.

scholarly journals Determining the Extent of Territorial Transport Services When Using Rail Transport

2019 ◽  
Vol 10 (2) ◽  
pp. 61-69
Author(s):  
Milan Dedík ◽  
Jozef Gašparík ◽  
Nikolina Brnjac
Keyword(s):  
Transport System ◽  
Rail Transport ◽  
Transport Systems ◽  
Transport Service ◽  
Factors Affecting ◽  
Transport Services ◽  
Complex Process ◽  
The Subject ◽  
Efficient Transport ◽  
Transport Potential

Abstract Planning the extent of transport services within a selected territory is a topical issue especially in the context of developing integrated transport systems. The objective of this research study is to design a sustainable system of public passenger transport that would be an alternative to expanding individual transport. The implementation of a quality and efficient transport service is a relatively complex process, since, currently, there are no generally applicable principles for its design. This manuscript presents general results of research aimed at solving the problem of transport service within a selected territory issue with a focus on rail transport as an efficient transport system representing a backbone of a transport system. The subject of the investigation is to compile a set of factors affecting the design of the transport concept. The output of the manuscript consists in a proposal of a generally applicable procedure including a calculation of transport potential and characteristics of the inputs. Subsequently, based on the resulting values, it will be possible to determine the extent of the transport services provided by rail transport in any territory, which will contribute to a more efficient and high quality theoretical graph of train running.

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