scholarly journals The dependence of the brake disc aerodynamic drag on the rolling stock motion speed

2021 ◽  
Vol 55 ◽  
pp. 723-730
Author(s):  
Juraj Gerlici ◽  
Yuliia Fomina ◽  
Kateryna Kravchenko
Keyword(s):  
Aerodynamic Drag ◽  
Rolling Stock ◽  
Brake Disc ◽  
Motion Speed

scholarly journals Dynamic indicators influencing design solution for modernization of the freight rolling stock

2021 ◽  
Vol 49 (3) ◽  
pp. 673-683
Author(s):  
Angela Shvets
Keyword(s):  
Quantitative Assessment ◽  
Technical Problem ◽  
Dynamic Loads ◽  
Rolling Stock ◽  
Design Solution ◽  
Theoretical Studies ◽  
Motion Speed ◽  
Curved Track ◽  
Loading Modes ◽  
Economic Indices

Rolling stock directly affects the economic indices of the transport industry and the national economy as a whole, leading to the need to improve control and quantify of the rolling stock dynamic load in order to maintain safe and reliable rail connections. In the process of rolling stock designing and operating, a quantitative assessment of dynamic loads is an urgent scientific and technical problem. The article presents an analysis of theoretical studies of the rolling stock dynamic characteristics on the example of open wagons, flat wagons and hopper wagons. The loading modes influence on the dynamic loading of the wagon has been studied with the aim of solving the problem of predicting the dynamics of rolling stock and indicators of its interaction with the track. The results of theoretical studies are presented taking into account the motion speed along the curved track of short and medium radius.

scholarly journals Calculated estimation of railway wheels equivalent conicity influence on critical speed of railway passenger car

2018 ◽  
Vol 157 ◽  
pp. 03006 ◽  
Author(s):  
Juraj Gerlici ◽  
Rostyslav Domin ◽  
Ganna Cherniak ◽  
Tomáš Lack
Keyword(s):  
High Speed ◽  
Critical Speed ◽  
Simulation Analysis ◽  
Rolling Stock ◽  
Passenger Car ◽  
Limit Values ◽  
Motion Speed ◽  
Railway Passenger ◽  
Railway Wheels ◽  
Equivalent Conicity

The article presents the results of determining the equivalent conicity characterizing the geometric interaction of wheels and rails on 1520 mm track. The cases of interactions of rails and wheelsets, wheels of which have different profiles, are considered. The computer model of the motion speed of the passenger car is developed. According to the results of computer simulation, critical speeds for the bogie moving through the tracks of indented gauge are received. Based on the results of the simulation analysis, the significant dependence of the value of the equivalent conicity on the critical speed is confirmed. The necessity of considering the limit values of equivalent conicity in tests of high-speed rolling stock is emphasized.

Power Consumption Analysis of High-Speed Train’s Brake Discs

2013 ◽  
Vol 765-767 ◽  
pp. 120-124
Author(s):  
Xiao Yu Zhu ◽  
Jian Yong Zuo
Keyword(s):  
Power Consumption ◽  
High Speed ◽  
Aerodynamic Drag ◽  
Brake Disc ◽  
High Speed Train ◽  
Air Inlet ◽  
Resistance Torque ◽  
Brake Discs ◽  
Rotational Parts ◽  
Traction Power

Apart from the aerodynamic drag produced by transitional motion of high-speed train, the rotational parts of the train, especially the ventilated discs mounted on axles, would also cause resistance torques due to air pumping effect, which consume traction power. In this paper the train running process is divided into traction, uniform running and braking three phases, then the power consumed by the brake discs as well as the proportion of which in total traction or braking power during the three periods is calculated based on kinetic energy theorem. The results indicate that, during traction and uniform running period, the power consumption of brake discs shares 2.84% and 12.87% of total traction power, and in brake stage, the proportion is 0.78%. What is more, in the uniform running phase, the proportion of brake discs power consumption caused by resistance torque can reach to 7.68%. If the air inlet of brake disc is blocked during traction and uniform running period to weaken air pumping effect, the useless power consumption can be effectively reduced and the traction efficiency can be improved.

Analysis and Design of 3.3 kV IGBT Based Three-Level DC/DC Converter with High-Frequency Isolation and Current Doubler Rectifier

2009 ◽  
Vol 25 (25) ◽  
pp. 103-108
Author(s):  
Dmitri Vinnikov ◽  
Tanel Jalakas ◽  
Indrek Roasto
Keyword(s):  
High Voltage ◽  
High Frequency ◽  
Power Converter ◽  
Rolling Stock ◽  
Analysis And Design ◽  
Auxiliary Power ◽  
Igbt Modules ◽  
Isolation Transformer ◽  
New Generation ◽  
Generation Power

Analysis and Design of 3.3 kV IGBT Based Three-Level DC/DC Converter with High-Frequency Isolation and Current Doubler RectifierThe paper presents the findings of a R&D project connected to the development of auxiliary power supply (APS) for the high-voltage DC-fed rolling stock applications. The aim was to design a new-generation power converter utilizing high-voltage IGBT modules, which can outpace the predecessors in terms of power density, i.e. to provide more power for smaller volumetric space. The topology proposed is 3.3 kV IGBT-based three-level neutral point clamped (NPC) half-bridge with high-frequency isolation transformer and current doubler rectifier that fulfils all the targets imposed by the designers. Despite an increased component count the proposed converter is very simple in design and operation. The paper provides an overview of the design with several recommendations and guidelines. Moreover, the simulation and experimental results are discussed and the performance evaluation of the proposed converter is presented.

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