2010, VOLUME 11 #3. "TRANSPORT AND TELECOMMUNICATION". ЖУРНАЛ ИЗДАТЕЛЬСТВА TSI, ISSN 1407-6160, ISSN 1407-6179 | TSI

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2010, VOLUME 11 #3. "TRANSPORT AND TELECOMMUNICATION". ЖУРНАЛ ИЗДАТЕЛЬСТВА TSI, ISSN 1407-6160, ISSN 1407-6179

 

CONSTRUCTION AND INVESTIGATION OF ONE CONTINUOUS NONSTATIONARY 3D MATHEMATICAL MODEL FOR MONITORING OF NOISE POLLUTION IN THE AREA SURROUNDING AN AIRPORT 

Sh. E. Guseynov1,2, Y. O. Solovyov1,3 O. V. Schiptsov1
 

1Transport and Telecommunication Institute
Lomonosova Str. 1, Riga, LV-1019, Latvia

2Institute of Mathematical Sciences and Information Technologies
University of Liepaja
Liela Str. 14, Liepaja, LV-3401, Latvia

3Air Baltic Corporation
Riga International Airport
Marupes pag., Riga, LV-1053, Latvia

This report is based on a scientific work which is dedicated to the development and research of an unsteady 3D mathematical model for the constant monitoring of the environmental situation of air and water in areas near an airport (airport ‘RIX’, City of Riga is used as an example). Mainly noise (acoustic) pollution is considered – the anthropogenic noise which interferes with the activities of humans and other living organisms. The report proposes a mathematical model, consisting of a system of two differential equations in partial derivatives with small parameters of the initial and mixed boundary conditions and the relevant consistency conditions. In addition, using monotone difference approximation, the proposed mathematical model is sampled, and the resulting second-order discrete model is solved numerically.

Keywords: noise pollution, dynamics of sound-wave propagation, system of PDE with small parameters, continuous mathematical model, finite-difference approximation

RELIABILITY AND REPLACEMENT OF VEHICLE FLEET 

Marta Knutelská

University of Zilina
Faculty of Operation and Economics of Transport and Communications
Univerzitna 1, 011 26 Žilina, Slovakia
E-mail: marta.knutelska@fpedas.uniza.sk

Reliability of any product is an integral part of its quality. Depending on the phase of the product lifecycle, certain types of reliability analysis are appropriate. The operational reliability takes into account operational conditions. It can be specified by evaluating the operational data gained during the operation of the object. In the area of operation of road vehicles, it is possible to evaluate records of failures, repairs, maintenance, operation costs, etc. These are stored in an information system or in another digital evidence system and are usable for operation reliability evaluation. The operational data can be also used to prognosticate the development of some reliability parameters. Most of SMEs in the area of transport do not use special software for the monitoring and evaluating of the operational reliability of road vehicles. This article refers to the possibility to acquire some variables of operation reliability from a commonly used Information Systems and to the possibility to create simple programming tool for decision-making and management support in the area of maintenance and replacement of road vehicles by means of common used office software.

Keywords: evaluation, reliability, replacement, road vehicles, software, Excel

THE PRESENTATION OF PRODUCTION LINE AND WAREHOUSE MANAGEMENT BASED ON RFID TECHNOLOGY THROUGH 3D MODELLING AND ANIMATION 

Peter Kolarovszki, Vladimír Dúbravka

University of Zilina
Faculty of Operation and Economics of Transport and Communications
Department of Communications
Univerzitná 1, 010 26, Slovakia
Ph.: +421908227492.
E-mail: peter.kolarovszki@fpedas.uniza.sk, Vladimir.Dubravka@gmail.com

The RFID technology is complex, combining a number of different computing and communications technologies to achieve desired objectives. This article primarily deals with the simulation of production line and warehouse management based on RFID technology, through 3D modelling and animation. It describes the various components of a RFID lab (a laboratory for the automatic identification of goods and services), which consist of a production line and a warehouse management system based on RFID technology. This paper characterizes and describes the processes that take place in the laboratory as well as the technologies which are used. Moreover it describes production line processes and warehouse management. 3D models and animations created to capture the whole process in the laboratory are set up and described.

Keywords: RFID technology, 3D models, warehouse management, simulation

SYNTHESIS OF TWO-CHANNEL EVEN-ORDER FILTERING SYSTEMS ON PHASE UNITS 

Тakhir Mamirov

Transport and Telecommunication Institute
Lomonosova Str. 1, Riga, LV 1019, Latvia.
Ph.: +371 29499489. Fax: +371 67100660.
E-mail: mamirov_t@yahoo.com

The fundamental opportunity of synthesis of even-order two-channel filters on phase units is described in article. The suggested approach is based on an artificial leading of structural- and electrical-asymmetric circuit to structural- and electrical-symmetric circuit using special matrix transformations. The major inconvenience of the method is that the complexity of the final analytical expression of the two-channel filter transfer function almost directly depends on the filter’s order. The synthesis examples of low-frequency and pass-band two-channel filters on phase units for small orders are given. The frequency characteristics are also provided.

Keywords: phase filter, synthesis, digital filters

FLEET MANAGEMENT PROBLEM ANALYSIS IN DISCRETE TRANSPORT SYSTEMS 

Jacek Mazurkiewicz, Tomasz Walkowiak

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

The paper describes a novel approach to analysis of management algorithms in discrete transport systems (DTS). The proposed method is based on modelling and simulating of the system behaviour. Monte Carlo simulation is a tool for DTS performance metric calculation. No restriction on the system structure and on a kind of distribution is the main advantage of the method. The system is described by the formal model, which includes reliability and functional parameters of DTS. The paper proposes to change the classic time-table based on management system of DTS by dynamic heuristic algorithms and algorithms based on artificial neural networks. The paper gives numerical results of simulation experiments. The results allow comparing mentioned above fleet management algorithms in different case studies.

Keywords: discrete transport system, reliability, Monte-Carlo simulation, fleet management algorithms, dispatching system

MULTI-TIER SPATIAL STOCHASTIC FRONTIER MODEL FOR COMPETITION AND COOPERATION OF EUROPEAN AIRPORTS 

Dmitry Pavlyuk

Transport and Telecommunication Institute
Lomonosova 1, Riga, LV-1019, Latvia
Ph.: +371 29958338.
Email: Dmitry.Pavlyuk@tsi.lv

This paper is devoted to a statistical analysis of spatial competition and cooperation between European airports. We propose a new multi-tier modification of spatial models, which will allow an estimation of spatial influence varying with distance. Competition and cooperation effects do not diminish steadily relative to distance from a given airport; their structure is more complex. The suggested model is based on a set of distance tiers, with different possible effects inside each tier. We apply the proposed modification to the standard spatial stochastic frontier model and use it to estimate competition and cooperation effects for European airports and airport efficiency levels. We identify three tiers of spatial influence with different competition-cooperation ratios in each one. In the first tier (closest to an airport) we note a significant advantage for cooperation effects over competition ones. In the second, more distant, tier we discover the opposite situation; a significant advantage for competition effects. There is no significant advantage for cooperation or competition effects with the most distant tier. In this paper we also consider some other possible applications of the proposed spatial multi-tier model.

Keywords: spatial stochastic frontier, airport efficiency, competition, cooperation

AN ARTIFICIAL INTELLIGENCE AS A TOOL FOR MONITORING THE RELIABILITY, THE SAFENESS AND ECONOMIC EXPEDIENCE OF THE TRANSPORT DEVICES 

Daniela Šusteková

University of Žilina
Department of Quantitative Methods and Economic Informatics
Univerzitná 1, Žilina, Slovakia
Ph.: +0421417235402.
E-mail: sustek@fpedas.uniza.sk

There is a basic concept of the inference engine designed using decision according to criteria described in this article, as well as the basic concept of an artificial intelligence and the main parts of an expert system (designed and created by the author) especially – Communication module, Basis of knowledge, Inference engine, Basis of facts, Module for getting information. There are results of described expert system in praxis in the airports and hardware and software requirements for expert system realization.

Keywords: the artificial intelligence, the expert system, inference engine, communication module, basis of knowledge, basis of facts, module for getting information, aircraft, failure rate, flying hours cost

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