scholarly journals Development of requirements for logic controls of the speed lines catenary system maintenance

2021 ◽  
Vol 2021 (4) ◽  
pp. 8-17
Author(s):  
Mokhirbek F. MUKHAMEDZHANOV ◽  
Keyword(s):  
High Speed ◽  
Practical Importance ◽  
Current Collector ◽  
Actual State ◽  
State Monitoring ◽  
Current Collection ◽  
Maintenance Schedule ◽  
Logic Control ◽  
Catenary System ◽  
System Life

Objective: To develop requirements for the organization of maintenance of the catenary system based on the actual state indicated by the digital diagnostic and monitoring platform in the logic control system for high-speed traffic. Methods: An overview analysis of high-speed catenary system diagnostics and monitoring systems is applied. Results: The systems of monitoring and automated control of catenary system devices in high-speed lines have been studied. The analytical findings as regards the maintenance methods according to the preventive maintenance schedule and based on the actual state monitoring data have been presented. Requirements for diagnostic and monitoring devices 15 of the high-speed lines catenary system have been formulated, aimed at improving the quality attributes of current collection. Practical importance: A structural diagram of quality diagnostics and monitoring for the current collection in the high-speed Current Collector–Catenary system was obtained. The design concept of a prin-cipal model of logic control of the catenary system life cycle has been developed

A Laboratory Model Study of a Railway Current Collection System

2007 ◽  
Author(s):  
Lars Drugge ◽  
Anders Lennartsson ◽  
Annika Stensson Trigell
Keyword(s):  
High Speed ◽  
Dynamic Properties ◽  
Current Collector ◽  
Laboratory Model ◽  
Contact Wire ◽  
Current Collection ◽  
Model Study ◽  
Stiffness Variation ◽  
Curved Track ◽  
Catenary System

A vital system on modern high-speed electric trains is the overhead catenary system and the pantograph current collector. As speed limits are increased, train operators and railway engineers need measures of system performance in a number of situations. In this work a laboratory model is built to study the pantograph behaviour on curved track running on a catenary system with large stiffness variation. The model is designed to be simple, yet exhibit the most characteristic dynamic properties of the real system. Another objective is the possibility to run the pantograph at speeds near the wave propagation velocity of the contact wire. The situation of several trailing pantographs, with even spacing, which excites the system to steady state, is considered. Effects of changes in design features such as tension in the contact wire and torsion and translation stiffness of components in the pantograph are studied for different speeds. The interaction is complex and the performance depends on the dynamic properties of both the catenary system and the pantograph. The results show that the pantograph configuration mainly affects the size of amplitudes in the system while the contact wire tension influences at which velocities large amplitudes and contact losses occur.

A preventive, opportunistic maintenance strategy for the catenary system of high-speed railways based on reliability

2019 ◽  
Vol 234 (10) ◽  
pp. 1149-1155
Author(s):  
Hongbo Cheng ◽  
Yufan Cao ◽  
Jiaxin Wang ◽  
Wei Zhang ◽  
Han Zeng
Keyword(s):  
High Speed ◽  
Maintenance Cost ◽  
Opportunistic Maintenance ◽  
Maintenance Schedule ◽  
Maintenance Time ◽  
Study Results ◽  
Railway System ◽  
Vital Component ◽  
Catenary System ◽  
Maintenance Schedules

The catenary is a vital component of the electrified railway system. It consists of many parts which are interrelated; the maintenance schedule of the catenary system should consider the influence of the interrelationship. In this study, a preventive, opportunistic maintenance method is proposed to schedule the maintenance process of the catenary system. First, the reliability of the key parts of the catenary is modeled using Weibull distribution. Second, a reliability margin is proposed to expand the maintenance time from point to interval, and the reliability margin is optimized to minimize the maintenance cost. Then, a preventive opportunistic maintenance schedule can be arranged on the basis of the optimal reliability margin. Case study results verify that the proposed preventive opportunistic maintenance method can reduce the number of maintenance schedules and can effectively save the maintenance cost.

Active Control of Fuzzy for High-Speed Pantograph

2012 ◽  
Vol 251 ◽  
pp. 158-163 ◽  
Author(s):  
Gang Yang ◽  
Zhong Mei Dai ◽  
Fu Li ◽  
Zheng Zhi Luo
Keyword(s):  
Active Control ◽  
Contact Force ◽  
High Speed ◽  
Fuzzy Controller ◽  
Current Collection ◽  
Maximum Value ◽  
Dynamic Performances ◽  
Catenary System ◽  
The Impact

The regular current collection is very important for high-speed train， and can be obviously improved by the use of active control. In order to study the impact of the fuzzy active control on pantograph-catenary system, the model ohe simulation model is created with the software of simulink. Finally the influences of fuzzy active control on dynamic performances and quality of current collection of the pantograph-catenary system are analyzed. It seems that, the performances of the system with or without active control is established, the fuzzy controller is constructed, and tf the pantograph- catenary system can be improved obviously under the fuzzy active control, the maximum value of the contact force is reduced to 50 percent, the minimum is increased to 80 percent, and the fluctuation extent of the contact force is reduced to 70 percent.

scholarly journals The Nonlinear Behaviour of a Pantograph Current Collector Suspension

1999 ◽  
Author(s):  
L. Drugge ◽  
T. Larsson ◽  
A. Berghuvud ◽  
A. Stensson
Keyword(s):  
High Speed ◽  
Current Collector ◽  
System Response ◽  
Nonlinear Behaviour ◽  
High Speed Train ◽  
Nonlinear Characteristics ◽  
Catenary System ◽  
Parameter Values ◽  
Force Excitation ◽  
Dynamic Phenomena

Abstract The pantograph-catenary system is a critical component for trains required to run at higher speeds. The pantograph often includes nonlinear characteristics and the scope of this work is to investigate if nonlinear dynamic phenomena can occur in an existing design. A model of a pantograph suspension subsystem has been developed according to physical parameter values of the head suspension of the Schunk WBL88/X2 pantograph, providing electric power to the Swedish high-speed train X2. Studies of the system response for different force excitation show both harmonic, subharmonic and chaotic behaviour for the investigated parameter regions.

Forecasting high-speed trains’ noise levels

2017 ◽  
pp. 82-88
Author(s):  
Tamila Tytova ◽  
Nikolay Ivanov ◽  
Aleksander Shashuryn ◽  
Yulia Boiko
Keyword(s):  
High Speed ◽  
Practical Importance ◽  
Current Collector ◽  
Technical Documentation ◽  
Noise Levels ◽  
High Speed Rail ◽  
Noise Current ◽  
Noise Characteristics ◽  
High Speed Trains ◽  
Normative Documentation

Objective: The data on normative documentation in the sphere of high-speed running, developed by the authors, was presented in the article. Methods: Calculation formulas of noise characteristics of trains at 3,5 m height, as well as certain sources of train noise (current collector, frame and forebody of a train). The main methods and means of high-speed rail lines’ noise reduction. Results: The normative and technical documentation developed by the authors of the article is the first and unique operating standard in Russia, regulating VSM noise calculation methods. Practical importance: The derived formulas make it possible to perform predictive estimate of high-speed rail lines’ noise levels, including the first Russian VSM “Moscow-Kazan”.

scholarly journals The effect of air flow on an aerodynamic device for a pantograph

2021 ◽  
Vol 2021 (4) ◽  
pp. 453-459
Author(s):  
A. A. Vorob’ev ◽  
◽  
Ya. S. Vatulin ◽  
D. D. Karimov ◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
High Speed ◽  
Practical Importance ◽  
Aerodynamic Resistance ◽  
Rolling Stock ◽  
Current Collectors ◽  
Current Collection ◽  
Electric Rolling Stock ◽  
Air Resistance ◽  
High Speed Trains

Objective: To evaluate the infl uence of the parameters of current collectors of high-speed and very high-speed trains on the value of aerodynamic resistance. To study the effect of airfl ow on a pantograph aerodynamic device using SolidWorks software. Methods: A comparison of the obtained values of aerodynamic air resistance with those that were produced earlier is carried out. Results: By means of aerodynamic device, it is possible to reduce the speed of the air fl ow effecting the pantograph, to reduce the values of aerodynamic resistance and energy consumption, to extend the service life of current collectors. Practical importance: The proposed design can improve the current collection, which will reduce the load on the overhead line and the pantograph slide, and reduce the energy consumption of electric rolling stock.

scholarly journals Ways to improve the efficiency of automatic control systems of pressing current collectors for railway service of high speeds

2019 ◽  
Vol 78 (2) ◽  
pp. 74-81
Author(s):  
A. S. GOLUBKOV ◽  
O. A. SIDOROV ◽  
S. N. SMERDIN
Keyword(s):  
Automatic Control ◽  
Control Systems ◽  
Contact Pressure ◽  
High Speed ◽  
Current Collector ◽  
Pneumatic Cylinder ◽  
Current Collection ◽  
Automatic Control Systems ◽  
High Speeds

One of the limiting factors in increasing train speeds on railway transport is the quality of current collection. With increasing operation speeds, the dynamic loads on the current collector from the rolling stock increase and the aerodynamic impact increases as well, which leads to an increase in the variation of the contact pressure, tearing off the current collector from the contact wire, arcing in contact and increased wear of the contact elements. A promising direction in addressing this issue is the use of automatic control systems, allowing to stabilize the amount of contact pressure. The article discusses the features of modern automatic control systems for pressing current collectors, its main disadvantages are indicated. Authors proposed new automatic control circuit for pressing a current collector, characterized by increased speed. A mathematical model of a current collector equipped with a high-speed automatic pressure control system is described. The results of the calculation of the parameters of the high-speed control system are presented, showing the possibility of its use in order to reduce the spread of the contact pressure of the current collector and improve the quality of the current collection at high speeds. Analysis of the characteristics of the transfer functions of the regulator shows that the application of the PI controller algorithm is effective for stabilizing the contact pressure. Since the rod length of the pneumatic cylinder is limited, the regulator is able to maintain pressure for a limited time, after which the rod must be returned to its original position. The speed of the rod is limited by the characteristics of the actuator (electric motor). These features cause a significant variation in system parameters, such as the time constant and the duration of maintaining a stable depression, depending on the values of the controller coefficients kp and ki, which should be set taking into account the parameters of the current collector, operating conditions and type of contact suspension. For the considered current collector model, the optimal values of the controller coefficients are kp = 1.5 and ki= 1.0. Results of the calculations showed that the use of a rapid regulator based on a pneumatic cylinder in the carriage design reduces the standard deviation of the contact pressure to 37 % at speeds of up to 260 km/h.

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