<abstract xmlns="http://www.w3.org/1999/xhtml"> The present paper deals with the vehicle’s traction electric drive, consisting of several various electric power sources. One of the main requirements for such systems are the safety and sustainable operations, achieved largely the implementation of an uninterrupted supply of the vehicle’s propulsion system with an electric power. One way of realization of the required level of operational sustainability is usage of Multi Power Source Traction Drive. This type of vehicle’s propulsion systems is widely applied on the ships, trains, planes, heavy trucks. The most important impact on the sustainability of functioning of the ship’s propulsion system have operational conditions, especially for the cargo ship, operating in Arctic region. This paper presents the application of the LZ-transform method to assessing the important parameter of the vehicle’s operational sustainability - availability of the multi-state (MSS) Multi Power Source Traction Drive, which includes Diesel-Generators and Gas-Turbine-Generators considering the impact of the real operating conditions. Straightforward Markov method applied to solve this problem will require building of a system’s model with numerous numbers of states and solve a corresponding system of multiple differential equations. LZ-transform method, drastically simplified the solution.</abstract>

Center for Reliability and Risk Management Industrial Engineering and Management Department SCE - Shamoon College of Engineering Beer-Sheva, Israel

Institute of Energy Conversion Technology Technical University of Munich Munich, Germany

Performance Availability Assessment of Combined Multi Power Source Traction Drive Considering Real Operational Conditions

<abstract xmlns="http://www.w3.org/1999/xhtml"> The orthogonal frequency division multiplexing (OFDM) aggregate signal energy characteristics are studied based on the OFDM signal simulation model. The information reliability of OFDM signal is explored for different sets of OFDM subcarrier numbers and varied multiposition keying types (MPK) on OFDM subcarriers. The conditions for optimal gain factor for OFDM signal are described analytically based on the simulation modeling results. The effect and value from using an optimal gain factor for OFDM signal is shown in this paper.</abstract>

Institute of Telecommunication Systems National Technical University of Ukraine “Kyiv Polytechnic Institute” Kyiv, Industrialny Street, 2, Ukraine, 03057; ORCID: 0000-0002-4073-9681

Institute of Telecommunication Systems National Technical University of Ukraine “Kyiv Polytechnic Institute” Kyiv, Industrialny Street, 2, Ukraine, 03057; ORCID: 0000-0002-6174-2986

OFDM Signal Research with Varied Subcarriers Number

<abstract xmlns="http://www.w3.org/1999/xhtml"> Synchronous motors and their modifications (ac converter-fed motor, etc.) enable to develop low-noise, reliable and economically efficient electric drive systems. The construction of up-to-date systems based on the synchronous machines is impossible without development of the computing software incorporating mathematical and computing simulation. In its turn, modelling of the synchronous machines as a rule is based on the equations by Park-Gorev, application of which requires adoption of a series of allowances. These allowances in a number of cases do not permit to obtain adequate results of the simulation coinciding with the results of field experiments of the systems under review. Moreover, while applying the system of equations by Park-Gorev to research the systems including interaction of synchronous machines with semiconducting converters of electric energy it is necessary simulate the process of formation their controlling signals in the sphere of frequency. If the states of converter’s keys are defined not only by controlling impulses but also by the state of currents in the synchronous machines flowing through them, such approach is not reasonable.</abstract>

Use of Information Intelligent Components for the Analysis of Complex Processes of Marine Energy Systems

<abstract xmlns="http://www.w3.org/1999/xhtml"> Recently in-vehicle route guidance and information systems are rapidly developing. Such systems are expected to reduce congestion in an urban traffic area. This social benefit is believed to be reached by imposing the route choices on the network users that lead to the system optimum traffic assignment. However, guidance service could be offered by different competitive business companies. Then route choices of different mutually independent groups of users may reject traffic assignment from the system optimum state. In this paper, a game theoretic approach is shown to be very efficient to formalize competitive traffic assignment problem with various groups of users in the form of non-cooperative network game with the Nash equilibrium search. The relationships between the Wardrop’s system optimum associated with the traffic assignment problem and the Nash equilibrium associated with the competitive traffic assignment problem are investigated. Moreover, some related aspects of the Nash equilibrium and the Wardrop’s user equilibrium assignments are also discussed.</abstract>

Saint Petersburg State University 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia

Solomenko Institute of Transport Problems of the Russian Academy of Sciences 13 12-th Line VO, St. Petersburg, 199178, Russia

Competitive Traffic Assignment in Road Networks

<abstract xmlns="http://www.w3.org/1999/xhtml"> The article deals with the optimizing the postal transportation network with two different optimizing methods. The research adopted in this article uses allocation models within graph theory to obtain results for addressed optimization problem. The article presents and compares two types of these models: p-median and uncapacitated fixed charge facility location model. The aim of p-median model is to find the location of P facilities in network, serving all demands in a way ensuring the average transport cost to be minimal. Fixed charge location model approach the issue of facility location based on minimizing the overall costs of implementation of selected variants. The latter this two models are subsequently applied on the postal network to determine the optimal location of postal facilities. These two models are adopted in the condition of large country with area above 300 000 km2. The Italy was chosen as a typical country that fits this condition. The underlying infrastructure of Italy is represented by simplified model of a postal network, abstracted by a graph G = (V, E, c, w). The results can serve as a basis for modification of the used models for the simulation of networks in the postal sector and as a key that compares the opportunities and results of application of these two models in the conditions large countries.</abstract>

University of Zilina, Zilina, Slovakia ++421/41/5133124

University of Zilina, Zilina, Slovakia ++421/41/5133125

University of Zilina, Zilina, Slovakia ++421/41/5133145

Technische Universität Dresden, Dresden, Germany ++49/351/46336795

Multiple Approaches of Solving Allocation Problems on Postal Transportation Network in Conditions of Large Countries

<abstract xmlns="http://www.w3.org/1999/xhtml"> This paper introduces a multi-stakeholder multi-criteria evaluation framework, which can be used for the assessment of the last mile distribution performance of urban freight terminals. To this end, a comparative analysis is conducted addressing two Greek urban intermodal freight terminals located at the port of Thessaloniki (ThPA) and Kuehne+Nagel (K+N)’s premises. The assessment of the terminals’ performance relies on a tailored multi-criteria Key Performance Indicator (KPI)-based evaluation framework, whereas the selection and significance of the incorporated criteria and KPIs is predetermined by the relevant responsible stakeholders, who imposed their viewpoint through an analytic hierarchy process. Results showed that ThPA was ranked first according to its performance pertaining to the role of an intermodal interchange; still, K+N’s performance index was only 8.5% lower than ThPA’s, while in specific KPIs it seems that it performs in a better way.</abstract>

University of Thessaly, Department of Civil Engineering Pedion Areos, 38334 Volos, Greece Ph.: +302421074164. Fax: +302421074131

University of Thessaly, Department of Civil Engineering Pedion Areos, 38334 Volos, Greece Ph.: +302421074158. Fax: +302421074131

Assessing the Contribution of Urban Freight Terminals in Last Mile Operations

<abstract xmlns="http://www.w3.org/1999/xhtml"> This paper describes a systematic calibration process of a Vissim model, based on data derived from BT detectors. It also provides instructions how to calibrate and validate a highway network model based upon a case study and establishes an example for practitioners that are interested in designing highway networks with micro simulation tools. Within this case study, a 94,5 % proper calibration to all segments was achieved First, an overview of the systematic calibration approach that will be followed is presented. A description of the given datasets follows. Finally, model’s systematic calibration and validation based on BT data from segments under free flow conditions is thoroughly explained. The delivered calibrated Vissim model acts as a test bed, which in combination with other analysis tools can be used for potential future exploitation regarding transportation related purposes.</abstract>

University of Thessaly Pedion Areos, 38334, Volos, Greece +302421074133

Technical University of Munich Arcistrasse 21, Munich, Germany +49 8928922333

University of Munich Arcistrasse 21, Munich, Germany +49 8928928586

Motorway Network Simulation Using Bluetooth Data

AHEAD OF PRINT

Volume 25 (2024): Issue 2 (April 2024)

Volume 25 (2024): Issue 1 (February 2024)

Volume 24 (2023): Issue 4 (November 2023)

Volume 24 (2023): Issue 3 (June 2023)

Volume 24 (2023): Issue 2 (April 2023)

Volume 24 (2023): Issue 1 (February 2023)

Volume 23 (2022): Issue 4 (November 2022)

Volume 23 (2022): Issue 3 (June 2022)

Volume 23 (2022): Issue 2 (April 2022)

Volume 23 (2022): Issue 1 (February 2022)

Volume 22 (2021): Issue 4 (November 2021)

Volume 22 (2021): Issue 3 (June 2021)

Volume 22 (2021): Issue 2 (April 2021)

Volume 22 (2021): Issue 1 (February 2021)

Volume 21 (2020): Issue 4 (December 2020)

Volume 21 (2020): Issue 3 (June 2020)

Volume 21 (2020): Issue 2 (April 2020)

Volume 21 (2020): Issue 1 (February 2020)

Volume 20 (2019): Issue 4 (December 2019)

Volume 20 (2019): Issue 3 (June 2019)

Volume 20 (2019): Issue 2 (April 2019)

Volume 20 (2019): Issue 1 (February 2019)

Volume 19 (2018): Issue 4 (December 2018)

Volume 19 (2018): Issue 3 (September 2018)

Volume 19 (2018): Issue 2 (June 2018)

Volume 19 (2018): Issue 1 (March 2018)

Volume 18 (2017): Issue 4 (December 2017)

Volume 18 (2017): Issue 3 (September 2017)

Volume 18 (2017): Issue 2 (June 2017)

Volume 18 (2017): Issue 1 (March 2017)

Volume 17 (2016): Issue 4 (December 2016)

Volume 17 (2016): Issue 3 (September 2016)

Volume 17 (2016): Issue 2 (June 2016)

Volume 17 (2016): Issue 1 (March 2016)

Volume 16 (2015): Issue 4 (December 2015)

Volume 16 (2015): Issue 3 (September 2015)

Volume 16 (2015): Issue 2 (June 2015)

Volume 16 (2015): Issue 1 (March 2015)

Volume 15 (2014): Issue 4 (December 2014)

Volume 15 (2014): Issue 3 (September 2014)

Volume 15 (2014): Issue 2 (June 2014)

Volume 15 (2014): Issue 1 (March 2014)

Volume 14 (2013): Issue 4 (December 2013)

Volume 14 (2013): Issue 3 (September 2013)

Volume 14 (2013): Issue 2 (June 2013)

Volume 14 (2013): Issue 1 (March 2013)

Volume 13 (2012): Issue 4 (December 2012)

Volume 13 (2012): Issue 3 (September 2012)

Volume 13 (2012): Issue 2 (January 2012)

Volume 13 (2012): Issue 1 (January 2012)

Transport and Telecommunication Journal

Journal “Transport and Telecommunication” is a peer-reviewed open-access scientific journal, owned by Transport and Telecommunication Institute and has more 10 years of experience. This Journal is a source of information and research results in the full scope of transport science: modelling and planning the transport systems, technical means of transport; transport infrastructure, traffic control, intellectual transport system, telematic and also concerns the interdisciplinary questions: transport and the environment, safety in transport, quality and effectiveness of transport, interoperability and intermodality. The journal aims at addressing professionals in transport and telecommunication in different types of positions in the area of industry, research and academic institutions. The Journal is published quarterly in the electronic and printed version.  Why subscribe and read  Journal reflects state of transport research in European and other countries and presents original articles, which are analytical and may be either theoretical or empirical research on transportation and telecommunication problems and issues.  Why submit  Opportunity to disseminate own research results in scientific community and to receive reviews and evaluation by international Editorial Board.  Rejection Rate   50%   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 