Communications - Scientific Letters of the University of Zilina, 2019 (vol. 21), issue 2
Operation and Economics in Transport
Realization of the Logistic Approach in the International Cargo Delivery System
Victor Aulin, Oleg Lyashuk, Olexiy Pavlenko, Denis Velykodnyi, Andrii Hrynkiv, Sergii Lysenko, Dmytro Holub, Yuriy Vovk, Volodymyr Dzyura, Mariana Sokol
Communications - Scientific Letters of the University of Zilina 2019, 21(2):3-12 | DOI: 10.26552/com.C.2019.2.3-12 
Fierce rivalry in the transport market raises serious reassessment and implementation of new approaches to logistics companies and trade enterprises in marketing of goods. To maintain the volume of domestic sales and output to the external one, producers and trading firms are forced to expand their trade and economic relations that occur in other regions. The integration of the world economy and policy orientation of foreign trade to free trade greatly simplify the task of setting up the free trade and economic connections, but the question is how quickly and efficiently, with the least costs, it is necessary to put the goods in the right region to...
Influence of Economic and Political Factors on the Public Rail Transport
Jiri Cejka, Martin Telecky
Communications - Scientific Letters of the University of Zilina 2019, 21(2):13-17 | DOI: 10.26552/com.C.2019.2.13-17
The goal of the paper is to assess the territorial development in terms of the public rail transport in conditions of the Czech Republic or, more precisely, in the south of Bohemia. The capacity utilisation of the railway line No. 190 in the direction from Ceske Budejovice to the target station of Strakonice is analysed and the suitable deployment of the set of wagons, intended to be used in providing the basic transport services in the low-populated areas, is evaluated. The paper is concerned with the current situation in utilising the capacities on the railway line No. 190 with respect to the future utilisation of the railway links that will be affected...
Mechanical Engineering in Transport
Hololens Used for Precise Position Tracking of the Third Party Devices - Autonomous Vehicles
Jindrich Cyrus, David Krcmarik, Reza Moezzi, Jan Koci, Michal Petru
Communications - Scientific Letters of the University of Zilina 2019, 21(2):18-23 | DOI: 10.26552/com.C.2019.2.18-23
A completely new area of HoloLens usage is proposed. The Hololens is an augmented reality device, which provides the high precision location information. Such an information is normally used to accurately position holograms within the real space with respect to the viewer (user of HoloLens). The information is precise enough to use it for reporting the position for the purpose of autonomous driving. Several experiments have been executed in vast areas (20 m x 40 m) in order to find out the potential error coming from vibrations or other effects when moving the HoloLens. The results show that the technology can be used for spaces, which are previously...
Determination of Parameters of Asynchronous Electric Machines with Asymmetrical Windings of Electric Locomotives
Sergey Goolak, Juraj Gerlici, Viktor Tkachenko, Svitlana Sapronova, Tomas Lack, Kateryna Kravchenko
Communications - Scientific Letters of the University of Zilina 2019, 21(2):24-31 | DOI: 10.26552/com.C.2019.2.24-31
This article is devoted to development of a method for calculating the parameters of an asynchronous motor of an electric locomotive with asymmetrical windings of stator and rotor. A method for determining self and mutual inductances of the stator and rotor phases of an asynchronous motor with asymmetric windings and their relations to mechanical variables is proposed. It is based on comparing two equations of stored magnetic energy, one equation calculated through induction, magnetic field strength and geometrical dimensions and another equation calculated through the parameters of the motor circuits. It is shown that the obtained solutions correspond...
Effect of Applied Current Density of Plasma Electrolytic Oxidation Process on Corrosion Resistance of AZ31 Magnesium Alloy
Daniel Kajanek, Branislav Hadzima, Matej Brezina, Martina Jackova
Communications - Scientific Letters of the University of Zilina 2019, 21(2):32-36 | DOI: 10.26552/com.C.2019.2.32-36
Impact of applied current density during the plasma electrolytic oxidation (PEO) process on corrosion resistance of AZ31 magnesium alloy was studied. The PEO coatings were prepared using four different current densities with values of 0.025 A/cm2, 0.05 A/cm2, 0.1 A/cm2 and 0.15 A/cm2 in electrolyte consisting of 10 g/l Na 3PO4.12H2O and 1 g/l KOH. Morphology and chemical composition of the coatings was examined using the scanning electron microscopy and EDS analysis respectively. Electrochemical characteristics of ground and coated samples were measured by means of electrochemical impedance spectroscopy (EIS) in 0.1M NaCl solution. Obtained data in...
Effects of Passive and Active Decontamination on Metal Materials Contaminated by Sulphur Mustard (Yperite)
Marketa Weisheitelova, Karel Klouda, Stanislav Lasek
Communications - Scientific Letters of the University of Zilina 2019, 21(2):37-43 | DOI: 10.26552/com.C.2019.2.37-43
This paper reports the results of the experimentally determined effects of decontaminating agents on metal surfaces resulting from passive and active decontamination after sulphur mustard (Yperite) contamination. The paper includes an analysis of the experimentally obtained results for each metal (Zinc, Nickel, Aluminium, Brass, Steel, Copper).
Study into Improvement of the Hatch Covers of General-Purpose Open Wagons to Provide Strength under Operational Loading Diagrams
Oleksij Fomin, Juraj Gerlici, Mykola Gorbunov, Alyona Lovska, Kateryna Kravchenko, Oleksii Burlutski, Tomas Lack
Communications - Scientific Letters of the University of Zilina 2019, 21(2):44-49 | DOI: 10.26552/com.C.2019.2.44-49
The article presents the results of research into the strength of the hatch covers of general-purpose open wagons. It was detected that strength of the standard hatch covers is not provided in operational loading diagrams. Therefore, new designs of the hatch covers for open wagons were proposed. The results of the strength calculation, implemented with the finite element method, make it possible to conclude that at basic and additional operational loading diagrams the strength values for proposed designs of hatch covers do not exceed the admissible values. The research conducted can contribute to a higher strength of the carrying structures of the...
Electrical Engineering in Transport
Voltage Stress Reduction on Compensation Capacitors of Wireless Charging Systems for Transport and Industrial Infrastructure
Miroslav Pavelek, Pavol Spanik, Michal Frivaldsky
Communications - Scientific Letters of the University of Zilina 2019, 21(2):50-57 | DOI: 10.26552/com.C.2019.2.50-57
The paper deals with a proposal for circuit configuration of series-series (SS) compensated wireless power transfer (WPT) system with reduced voltage stresses on compensation capacitors. Nowadays, a huge effort is given for the development of reliable, efficient and robust wireless charging systems and therefore the circuit configuration and component selection are crucial to meet suitable operational characteristics. For this purpose, the current trends in WPT systems are outlined in the first section. Next, the analysis of frequently utilized WPT system configuration is provided and the most critical issues related to practical utilization are discussed....
Key Assembling Issues Relating to Mechanical Vibration of Fabricated Rotor of Large Induction Machines
Vladimir Kindl, Miroslav Byrtus, Bohumil Skala, Vaclav Kus
Communications - Scientific Letters of the University of Zilina 2019, 21(2):58-68 | DOI: 10.26552/com.C.2019.2.58-68
In many applications, where rotating machines of high power are used, high demands on reliability and safety are laid. Precise manufacturing procedures has to be kept even in case of machines retrofits when e.g. rotors are newly assembled. Even small inaccuracies or misguiding the precise technological procedure can lead to improper running of the machine and it can result in shut-down of complete drive. In case of primary circuits of nuclear power plants, it further means the shut-down of the whole power plant. Consequently, it results in significant financial losses (foregone profit and cost given by problem fixing). The paper presents a methodology...
Communication of Cluster Using Can Bus
Matej Kubis, Miroslav Gutten, Daniel Korenciak, Matus Danko
Communications - Scientific Letters of the University of Zilina 2019, 21(2):69-74 | DOI: 10.26552/com.C.2019.2.69-74
The paper deals with the communication between the infotainment elements and the drive component of the car using the CAN bus. In the introduction, there is briefly described the communication bus used in cars. It describes its basic features, benefits and utilization. The main task is graphically programmed and builds a dashboard that will resemble to a real dashboard from a Volkswagen Golf 5. Using the dashboard built in LabVIEW, it controls the real dashboard.
Civil Engineering in Transport
Computer Simulation Models for Consideration of Seasonal Trends Influence on the Structural Dynamics of Bridges
Taisiya V. Shepitko, Elena S. Shepitko, Vladimir S. Afanasev
Communications - Scientific Letters of the University of Zilina 2019, 21(2):75-80 | DOI: 10.26552/com.C.2019.2.75-80
Elimination of seasonality temperature trends in a structural health monitoring of bridges is considered in the article. On example of a beam bridge, eigenfrequencies are plotted against seasonal fluctuations of environmental temperature. Next, analysis of a time series, formed from a data of frequency changes in the bridge, was made. To describe the time series, two different methods were implemented: ARIMA model based on a statistical relationship between the data and LSTM model of a recurrent neural network.
Laboratory Evaluation of Railway Ballast Consolidation by the Non-Destructive Testing
Mykola Sysyn, Vitalii Kovalchuk, Ulf Gerber, Olga Nabochenko, Bogdan Parneta
Communications - Scientific Letters of the University of Zilina 2019, 21(2):81-88 | DOI: 10.26552/com.C.2019.2.81-88
The property of railway track to resist the irreversible deformation for a long-term operational loading considerably depends on the ballast layer. The ballast layer is the element of a railway track whose mechanical properties and state are formed in-situ with the help of the ballast cleaning, tamping and distributing machines. The varied properties of the ballast material to obtain the form during the maintenance and retain it during the operation are equally important for the ballast layer. The control over the processes of the ballast consolidation and deconsolidation by means of measurement methods could potentially provide great possibilities...
Management Science and Informatics in Transport
Estimating the Parameters of Traffic Flows on the Basis of Processing of Localization Data on the Movement of Vehicles
Denis Kapski, Valery Kasyanik, Oleksii Lobashov, Aleksandra Volynets, Oleg Kaptsevich, Andrii Galkin
Communications - Scientific Letters of the University of Zilina 2019, 21(2):89-99 | DOI: 10.26552/com.C.2019.2.89-99
The article describes the method of estimating the parameters of transport flows using the two-fluid mathematical model of Herman-Prigogine and developed and based on the proposed method of estimating the parameters of the system on the basis of passive processing of navigation data on the movement of vehicles. The efficiency of the proposed algorithms, mathematical models for estimating the parameters of road traffic flow and system as a whole was confirmed during its testing using a set of tracks on the main highways of Commonwealth of Independent States.
Including Containers with Dangerous Goods in the Cargo Mix Problem for Container Vessel Stowage
Kiros Gebrearegawi Kebedow, Johan Oppen
Communications - Scientific Letters of the University of Zilina 2019, 21(2):100-113 | DOI: 10.26552/com.C.2019.2.100-113
The Cargo Mix Problem (CMP) chooses and distributes types of containers to load into bay subsections of a container vessel. In this paper, we extend existing Mixed Integer Programming models for the CMP by considering containers with dangerous goods. We show that our model can be optimally solved in reasonable time using standard software.
Safety and Security Engineering in Transport
Novice Czech Drivers' Ability and Willingness to Offer the First Aid after Traffic Accidents: The Positive Effect of the First-Aid Training
Vaclav Linkov, Martina Trepacova, Veronika Kureckova, Chih-Wei Pai
Communications - Scientific Letters of the University of Zilina 2019, 21(2):114-118 | DOI: 10.26552/com.C.2019.2.114-118
The first aid is an important tool to save people's lives after traffic accidents. Drivers are the most-likely bystanders, who might help injured people at the traffic accident site. The current research aims to explore Czech learner drivers' knowledge and attitudes towards the first aid and to evaluate whether the first aid education increases the likelihood that a driver will provide the first aid for injuries resulting from traffic accidents. A questionnaire survey was conducted in 2015 among a sample of 370 Czech learner drivers at driving schools. The two groups of student drivers were compared - those who had attended the first aid classes (FAC)...
Erratum
Errata: Communications - Scientific Letters of the University of Zilina, 21(1), 2019, Passsenger Ride Comfort and International Roughness Index Specifications in the Slovak Republic, p. 15-22.
Peter Mucka, George Juraj Stein, Peter Tobolka
Communications - Scientific Letters of the University of Zilina 2019, 21(2):119-120 | DOI: 10.26552/com.C.2019.2.119-120
Errata: Communications - Scientific Letters of the University of Zilina, 21(1), 2019, Passsenger Ride Comfort and International Roughness Index Specifications in the Slovak Republic, p. 15-22.