scholarly journals Safety of Single-Channel Railway Traffic Control

2020 ◽  
Vol 64 (186) ◽  
pp. 125-131
Author(s):  
Roman Pniewski
Keyword(s):  
Control Systems ◽  
Traffic Control ◽  
Single Channel ◽  
Fault Tolerant ◽  
Reversible Logic ◽  
Digital Systems ◽  
Safety Level ◽  
Digital Devices ◽  
Railway Traffic ◽  
Safe Control

Reversible gates enable the creation of fault tolerant digital devices. The application of these gates allows safe control systems to be realized. At present, control systems based on relays are being replaced by systems based on computer technology. This technology allows the implementation of safe systems. Because this system is composed of many elements, it is very difficult to obtain a high safety level for it. The application of reversible logic in the synthesis of digital systems constitutes an alternative approach. The paper presents reversible gates along with examples of their usage in the synthesis of digital systems. The main advantage of reversible logic is the possibility of synthesis of self testing and fault tolerant circuits. The application of circuits based on reversible logic allows safe control systems to be developed. The paper also presents a proposal for the application of reversible logic in simple control systems. Keywords: reversible logic, railway traffic control, safety

scholarly journals Safety of single-channel control systems implemented in reversible logic

2018 ◽  
Vol 19 (12) ◽  
pp. 608-610
Author(s):  
Roman Pniewski ◽  
Michał Dobrzański
Keyword(s):  
Control Systems ◽  
Single Channel ◽  
Control Method ◽  
Fault Tolerant ◽  
Dynamic Change ◽  
Reversible Logic ◽  
Digital Systems ◽  
Correct Operation ◽  
Control Signals ◽  
Channel Control

The article discusses the method of controlling the correct operation of a control system using reversible gates developed by the authors. Reversible logic allows you to build fault-tolerant digital systems. The authors proposed an improved control method with a dynamic change of control signals, which can significantly improve safety.

The Concept of Railway Traffic Control Systems Remote Diagnostic

2017 ◽  
pp. 471-481 ◽  
Author(s):  
Waldemar Nowakowski ◽  
Tomasz Ciszewski ◽  
Zbigniew Łukasik
Keyword(s):  
Control Systems ◽  
Traffic Control ◽  
Railway Traffic

Probabilistic method for railway traffic control systems diagnosis

2019 ◽  
Vol 124 ◽  
pp. 133-140
Author(s):  
Waldemar Nowakowski ◽  
Tomasz Ciszewski ◽  
Zbigniew Łukasik
Keyword(s):  
Control Systems ◽  
Information And Communication Technologies ◽  
Traffic Control ◽  
Diagnostic Method ◽  
Negative Impact ◽  
Probabilistic Method ◽  
Railway Traffic ◽  
Information And Communication ◽  
High Level ◽  
Contemporary Development

Railway traffic control systems have a key role in ensuring the smooth operation of railway traffic. Therefore, the basic requirement, in addition to the implementation of necessary system functions, is continuous striving for ensuring the high level of reliability. Contemporary development of railway traffic control systems is associated with the application of modern information and communication technologies, which makes it possible to extend the functionality of these systems by the logging events and selfdiagnostics. However, there are no standards in this area, which considerably complicates the unification of scope and types of acquired diagnostic data as well as their analysis. This, of course, has a negative impact on the maintenance of the systems technical reliability. The authors of the paper have noticed this important problem and have proposed a new diagnostic method for railway traffic control systems, which is based on a probabilistic inference. They also verified the developed diagnostic method by testing it on the level crossing protection system. The obtained results have proved the correctness of the adopted railway traffic control systems diagnosing concept.

scholarly journals Design and Simulation of a Decentralized Railway Traffic Control System

2016 ◽  
Vol 6 (2) ◽  
pp. 945-951 ◽  
Author(s):  
T. Kara ◽  
M. Cengiz Savas
Keyword(s):  
Control System ◽  
Control Systems ◽  
Traffic Control ◽  
Traffic Management ◽  
General Structure ◽  
Railway Transportation ◽  
Railway Line ◽  
Railway Traffic ◽  
Traffic Control System ◽  
Traffic Management System

With the increasing use of railway transportation, various methods have been developed for the control and management of train traffic. Train traffic control systems that are currently in use are overwhelmingly centralized systems. In this study, the development of the general structure of railway traffic control techniques is examined, centralized and decentralized control systems are investigated, and an alternative train traffic control system, the Decentralized Train Traffic Management System (DTMS), is suggested. Simulation results on the possible application of the proposed method to a railway line in South-East Turkey are employed to evaluate the performance of the developed system.

scholarly journals SRK systems - registration of operating data

2018 ◽  
Vol 19 (6) ◽  
pp. 761-763
Author(s):  
Bartłomiej Ulatowski ◽  
Zbigniew Łukasik
Keyword(s):  
Control Systems ◽  
Traffic Control ◽  
High Speed ◽  
Railway Transport ◽  
Operating Data ◽  
Railway Traffic ◽  
European Project ◽  
Operational Data ◽  
Rail Traffic

The following article deals with the topic of Rail Traffic Control systems, focusing on the aspects of registration and acquisition of operational data. In the first part of the text, the authors focused on describing what SRK systems are, and how they can be modernized in order to increase security. At the beginning of the study, the authors presented a railway transport called "High Speed railways". The KDP had a big influence on the development of SRK systems. In the further part of the article, the authors focused on the possibility of recording operating data of individual systems and presented the ETCS system, which is a European project aimed at standardizing systems for Railway Traffic Control.

scholarly journals Study of the possibility of using transmission in the lte system on a selected railway line for the purpose of running railway traffic

2021 ◽  
Vol 57 (1) ◽  
pp. 91-101
Author(s):  
Marcin Chrzan
Keyword(s):  
Control Systems ◽  
Traffic Control ◽  
Research Work ◽  
Rolling Stock ◽  
The European Union ◽  
Radio Communication ◽  
Railway Line ◽  
Railway Traffic ◽  
Railway Infrastructure ◽  
Rail Traffic

The railway and the Rail Traffic Control Systems installed on it in Poland have recently experienced rapid technologi-cal development. This is undoubtedly due to the funds that Poland receives from the European Union for the moderni-zation of railway infrastructure. The development of modern railway infrastructure means not only stations, modern rolling stock, but also safe and reliable train control systems based on the latest telecommunications and information technologies. For a longer time, radio communication based on the GSM-R (GSM for Railways) standard is being introduced on PKP. For this purpose, dedicated infrastructure is being built in order to use this technology for railway traffic. This is associated with huge investment costs. Since the beginning of its existence, research has been conducted worldwide on the use of LTE (Long Term Evolution) technology for conducting railway traffic. For economic and technological reasons, it is necessary to study other possibilities of using modern telecommunications infrastructure not yet dedicated to railway tasks in these open networks. The article will present research on the use of open radio communication network based on LTE standard for rail traffic and passenger comfort. It will discuss the research method and selected results of measurements made on railway line no. 4. The choice of this railway line was dictated by two factors. The first one resulted from the maximum train speed, the second one is the variety of rolling stock used on this line (compartmental and non-compartmental wagons). The part of research concerning collection of measurement material was performed within the framework of completed research work PBS3/A6/29/2015. As a result of conducted in-depth literature analysis as well as performed measurements and calculations, it allowed to develop a model and software for simulating system operation in real conditions. This system allows to send railway telegrams on appropriate safety level defined in standardization documents. The research proved the possibility of using an open system in the LTE standard for the transmission of signals for railway traffic control and passengers while maintaining an appropriate level of safety. The only limitations which were indicated by the tests are improper radio interface coverage of railway lines. Appropriate planning of radio coverage of railway areas by radio communi-cation operators (so far ignored) with proper cooperation of infrastructure manager can lead to launching efficient communication system without necessity to build specialized infrastructure for railway.

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