scholarly journals Optimization of Safety System Structures in Railway Transport

2021 ◽  
Vol 13 (19) ◽  
pp. 10700
Author(s):  
Adrian Gill ◽  
Piotr Smoczyński
Keyword(s):  
Control Systems ◽  
Traffic Control ◽  
Search Algorithm ◽  
Optimal Solution ◽  
Optimization Method ◽  
Safety System ◽  
Railway Transport ◽  
Railway Traffic ◽  
System Components ◽  
Selection Of

One of the basic strategies for reacting to unacceptable risk is introducing new elements to the analyzed domain. These elements and the relations between them can be treated as a safety system. Although expanding the safety system usually reduces the risk of specific hazards, it often leads to new problems resulting from its excessive development: the system becomes costly and difficult to understand. One of the methods of avoiding the negative issues is to apply an approach described in this paper, which is based on an optimization method making use of the results of risk analysis. The article contains a detailed mathematical description of an optimal solution search algorithm, enabling the selection of a configuration of safety system components that will be the most appropriate in terms of the degree of risk reduction and the related costs. The theoretical part was supplemented with a working example concerning railway traffic control systems. Using the proposed method, it is possible to obtain an optimal structure of a safety system, ensuring at least a tolerated level of risk, adequate to the identified hazards.

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 Selection of exploitation data from railway traffic control devices for the purposes of gathering and analyzing data processes from railway transport objects

2019 ◽  
Vol 2019 (5) ◽  
pp. 43-53
Author(s):  
Janusz Dyduch ◽  
Mieczysław Kornaszewski
Keyword(s):  
Traffic Control ◽  
Technical Condition ◽  
Reliable Data ◽  
Railway Transport ◽  
Railway Traffic ◽  
Decision Making Processes ◽  
Control Devices ◽  
Technical Systems ◽  
Traffic Control Devices ◽  
Selection Of

The evaluation of the technical systems reliability and safety requires collecting and processing of reliable data which characterizes the processes. The data from current exploitation is particularly important for decision-making processes. It can be used for creation of occurring exploitation phenomena models and allows to determine the expected object behaviour in the future. The railway traffic control devices often work in very difficult exploitation and environmental conditions. The information about their technical condition can be gathered and used for a proper prophylaxis as well as a predictive maintenance of railway traffic. It will allow to choose a maintenance strategy which will consist in optimal use of railway traffic control devices.

scholarly journals A COMPARISON BETWEEN MILP AND MINLP APPROACHES TO OPTIMAL SOLUTION OF NONLINEAR DISCRETE TRANSPORTATION PROBLEM

Transport ◽  
2014 ◽  
Vol 30 (2) ◽  
pp. 135-144 ◽  
Author(s):  
Uroš Klanšek
Keyword(s):  
Transportation Problem ◽  
Optimal Solution ◽  
Optimization Method ◽  
Mixed Integer ◽  
Test Problems ◽  
Model Formulation ◽  
Reference Test ◽  
Adequate Model ◽  
Integer Nonlinear Programming ◽  
Selection Of

Finding an exact optimal solution of the Nonlinear Discrete Transportation Problem (NDTP) represents a challenging task in transportation science. Development of an adequate model formulation and selection of an appropriate optimization method are thus significant for attaining valuable solution of the NDTP. When nonlinearities appear within the criterion of optimization, the NDTP can be formulated directly as a Mixed-Integer Nonlinear Programming (MINLP) task or it can be linearized and converted into a Mixed-Integer Linear Programming (MILP) problem. This paper presents a comparison between MILP and MINLP approaches to exact optimal solution of the NDTP. The comparison is based on obtained results of experiments executed on a set of reference test problems. The paper discusses advantages and limitations of both optimization approaches.

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 Development of a Power and Communication Bus Using HIL and Computational Intelligence

2021 ◽  
Vol 11 (18) ◽  
pp. 8709
Author(s):  
Marek Sznura ◽  
Piotr Przystałka
Keyword(s):  
Computational Intelligence ◽  
Heuristic Algorithms ◽  
Optimal Solution ◽  
Optimization Method ◽  
Main Research ◽  
Optimization Task ◽  
Criterion Functions ◽  
Research Goal ◽  
Loop Technique ◽  
Selection Of

This paper deals with the development of a power and communication bus named DLN (Device Lightweight Network) that can be seen as a new interface with auto-addressing functionality to transfer power and data by means of two wires in modern cars. The main research goal of this paper is to elaborate a new method based on a hardware in the loop technique aided by computational intelligence algorithms in order to search for the optimal structure of the communication modules, as well as optimal features of hardware parts and the values of software parameters. The desired properties of communication modules, which have a strong influence on the performance of the bus, cannot be found using a classical engineering approach due to the large number of possible combinations of configuration of the hardware and software parts of the whole system. Therefore, an HIL-based optimization method for bus prototyping is proposed, in which the optimization task is formulated as a multi-criteria optimization problem. Several criterion functions are proposed, corresponding to the automotive objectives and requirements. Different soft computing optimization algorithms, such as a single-objective/multi-objectives evolutionary algorithm and a particle swarm optimization algorithm, are applied to searching for the optimal solution. The verification study was carried out in order to show the merits and limitations of the proposed approach. Attention was also paid to the problem of the selection of the behavioural parameters of the heuristic algorithms. The overall results proved the high practical potential of the DLN, which was developed using the proposed optimization method.

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 GNSS availability monitoring method for railway transport

2018 ◽  
Vol 216 ◽  
pp. 01001
Author(s):  
Vladislav Demyanov ◽  
Boris Shurygin ◽  
Olga Imarova
Keyword(s):  
Traffic Control ◽  
Rolling Stock ◽  
Total Probability ◽  
Railway Transport ◽  
Monitoring Method ◽  
Differential Systems ◽  
Railway Traffic ◽  
Navigation Support ◽  
Range Error ◽  
Railway Rolling Stock

The article studies relevant problem of real time monitoring - the availability of the required GNSS navigation characteristics, which is required for railway rolling stock traffic automation. As prototypes, the main approaches to monitoring the availability of the required navigation characteristics of WAAS EGNOS wide area differential systems users were analyzed. It was shown that the use of the total probability of violation of the required navigation characteristics without decomposition of an equivalent range error is an appropriate approach for building the algorithm for monitoring the availability of navigation support for transport applications. The method of monitoring the availability of required navigation characteristics was proposed for automated railway traffic control tasks.

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