2011, volume 12 #4. "Transport and Telecommunication". Журнал издательства TSI, ISSN 1407-6160, ISSN 1407-6179 | TSI

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2011, volume 12 #4. "Transport and Telecommunication". Журнал издательства TSI, ISSN 1407-6160, ISSN 1407-6179

 

PROBLEMS OF ROAD COVERAGE QUALITY ESTIMATION BY GPR PROBING METHOD

Alexander Krainyukov, Valery Kutev

Transport and Telecommunications Institute
Lomonosova str. 1, Riga, LV-1019, Latvia
Phone:+371 67100634. Fax: +371 67100660
E-mail: Aleksandrs.Krainukovs@tsi.lv, Valerijs.Kutev@tsi.lv

This work deals with problems of flexible pavement structure quality estimation with help of ground-penetrating radars (GPR). Forward and inverse problems of flexible pavement structure GPR probing are discussed. Iterative procedure to solve the inverse problem in frequency domain is used on the base of aim function minimization by using the genetic algorithm. The results of reconstruction of electro-physical characteristics for model of flexible pavement structure are presented.

Keywords: radar probing, inverse problem, genetic algorithm, reconstruction of electro-physical characteristics

MULTIAGENT MODELING AND XML-LIKE DESCRIPTION OF DISCRETE TRANSPORT SYSTEM

Katarzyna Nowak, Jacek Mazurkiewicz

Institute of Computer Engineering, Control and Robotics
Wroclaw University of Technology
ul. Janiszewskiego 11/17, 50-372 Wroclaw, Poland
E-mails: Katarzyna.M.Nowak@pwr.wroc.pl, Jacek.Mazurkiewicz@pwr.wroc.pl

The paper describes a novel idea to monitoring and modeling of Discrete Transport System (DTS). We propose the formal model of the transport system with the approach to its modelling based on the system behaviour observation. The proposed method is based on specified description languages that can be seen as a bridge between the system description (as a mathematical or expert specification) and the analysis tools. The DTS is a simplified case of the Polish Post. Using a multilevel-agent based architecture the realistic data are collected. Described architecture can be found as a basis for a tool that can visualize and analyze data, with respect to the real parameters. Absence of any restrictions on the system structure and on the kind of distribution describing the system functional and reliability parameters is the main advantage of the approach. The paper presents some exemplar system modeling based on a case study. The proposed approach can be used as a helpful tool to administrate the system.

Keywords: Discrete Transport System, reliability, agent management system

WEIGHT-IN-MOTION (WIM) MEASUREMENTS BY FIBER OPTIC SENSOR: PROBLEMS AND SOLUTIONS

Anatoly Batenko, Alexander Grakovski, Igor Kabashkin, Elmars Petersons, Yuri Sikerzhicki

Transport and Telecommunication Institute
Lomonosova str.1, Riga, LV 1019, Latvia
Phone: (+371) 67100654. Fax: (+371) 67100535. Е-mail: avg@tsi.l

In the present study the authors are discussing the possibility of fibre optic sensor application for weighing road vehicles in motion (WIM – weight-in-motion). The various factors affecting the accuracy of fibre optic sensors measurement are considered to be: features of the installation in the roadway, the nonlinearity and inertia of the sensor, the thermal effect, the inertial force of the vibrating vehicle and the extremely short time of the load standing on the sensor. The examples of the record signals, transferring to a fibre optic sensor, are made. The analysis of the causes of measurement error and possible ways to improve the accuracy of weighing for the solution of the pre-selection of road vehicles in motion upon the dynamic load on the axis is submitted.

Keywords: intelligent transport system, vehicle detection, weight-in-motion, fibre optic sensors, dynamic measurement, digital signal processing

BASIC CONCEPT OF THE TECHNICAL STUDY OF THE TRAFFIC CONTROL SYSTEM IN PREŠOV

Andrea Gavulová, Rastislav Pirník

University of Žilina, Faculty of Civil Engineering, Department of Highway Engineering
Faculty of Electrical Engineering, Department of Control and Information Systems
Univerzitná 8251/1, SK-010 26 Žilina, Slovak Republic
Phone:+421-41-513 9512. E-mail: andrea.gavulova@fstav.uniza.sk, rastislav.pirnik@fel.uniza.sk

The project „Support Programme for the development of intelligent transport systems – National Traffic Information System for Slovakia“ also includes implementation of ITS of 11 chosen Slovak urban agglomerations. For the purposes of this project Technical study document for each town was elaborated in the first phase. The Technical study analyses existing and expected situation, defines critical localities on the basis of this analysis, which is necessary to solve and defines a framework for solution and its technical characteristics, respectively different alternatives of solutions. The article describes the current state of the ITS in the Slovak Republic, the scope of the Technical study of urban ITS and an ideological proposal of the Traffic Control System (TCS) in Prešov town, which has been elaborated at the author’s’ workplace. The urban ITS with respect to main goal – capacity increasing of existing urban road network and traffic congestion reducing – has been designed. In the article, functions and connections of all subsystems of TCS Prešov, their location within the town and connection to the NTIC (National Traffic Information Centre) master system are described in more details.

Keywords: intelligent transport system, ITS, traffic control system, detection system, traffic control centre

ESTIMATION OF TRANSPORT SERVICE QUALITY LEVEL USING ECONOMETRIC MODELS

Nadezda Spiridovska1, Irina Yatskiv2

Transport and Telecommunication Institute
Lomonosova str. 1, Riga LV-1019, Latvia
Phone: +371 67100594
E-mail: 1nk@tsi.lv, 2ivl@tsi.lv

Regression for polytomous data and ordinal logit model have been used for estimation the overall service quality under the influence of partial quality attributes. The numerical examples were done on the basis of results of questionnaire of transport experts about quality of service in Riga Coach Terminal. Short description of each method of model development is provided. To compare the suggested approaches the paper discussed three variants of models: with complete set of factors, model with most significant factors and model with grouped factors. The advantages and disadvantages of using each method and also practical recommendations on the application are provided in the investigation.

Keywords: mathematical model, estimation, quality service, polytomous data, ordinal data, regression, logit model

DETERMINED MODEL AND SCALE DIAGRAMS TO INVESTIGATE PROBLEM OF TRANSPORT DELAYS

Vasili Shuts1, Aksana Vaitsekhovitch2

1Institution: Brest State Technical University
Moskowskaja Str. 267, Brest, 224017, Belarus
Phone: (+375 162) 5264295. E-mail: lucking@mail.ru
2Institution: Brest State Technical University
Moskowskaja Str.267, Brest, 224017, Belarus
E-mail: vandox@mail.ru

In the paper the following question is investigated: what are the reasons of transport delays besides the diffusion of platoons? To answer the question a determined model is developed. It has a number of restrictions. A scale diagram of the highway state in discrete time points is created and described in details. The paper examines certain parameters of the determined model and its response to changes in these parameters with the help of scale diagrams. To be more precise all the places of delays can be detected according to the highway state diagram. Some of these delays can be substantially reduced by using phase offset of green traffic light from the side directions. So the paper contains proposals for the optimization of the developed model, aimed to reduce motor vehicle delays in front of the in-traffic light stop line along the main highway direction. Besides, the density of vehicles on the highway is considered.

Keywords: determined model, platoon, highway, intersection, traffic

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