Communications - Scientific Letters of the University of Zilina, 2020 (vol. 22), issue 1
Operation and Economics in Transport
Consumer Perspective on Public Transport: The Medan-Pematang Siantar Route as a Case Study
Dewi Budhiartini Juli Isnaini
Communications - Scientific Letters of the University of Zilina 2020, 22(1):3-8 | DOI: 10.26552/com.C.2020.1.3-8 
Development of public transportation is meant to bridge the divide between cities and encourage development results. The inter-city transportation opens up opportunities for the inter-city trade, reduces costs and increases labor mobility, thereby promoting the inter-city development opportunities. This study uses the factor and cluster analyses. Analysis of factors is performed to determine the most dominant factors. The cluster analysis is used to identify the advantages and disdvantages of five modes of transport, namely taxi, trade rail, economy bus, mini bus, and executive bus. This study aims to determine the perception of users of Medan-Pematang...
Impact of Vehicle Type and Road Quality on Cargo Securing
Martin Vlkovsky
Communications - Scientific Letters of the University of Zilina 2020, 22(1):9-14 | DOI: 10.26552/com.C.2020.1.9-14
The article is concerned with comparison of the three transportation experiments using the two vehicle types (Tatra 810 and Tatra 815 MK IV) on two road types (higher and lower quality). From the transportation experiments, three datasets were obtained to be compared mutually and to the normatively determined values of acceleration coefficients, as well. In the article, the calculation of the probability of excess and double excess of the normatively determined limits is also included. For the purpose of the comparison, statistical tests of equality and three different parameters are employed. Statistically significant differences between the datasets...
Determining the Elements of Exterior Orientation in Aerial Triangulation Processing Using UAV Technology
Damian Wierzbicki, Kamil Krasuski
Communications - Scientific Letters of the University of Zilina 2020, 22(1):15-24 | DOI: 10.26552/com.C.2020.1.15-24
Unmanned Aerial Vehicles (UAVs) are still an interesting and current research topic in photogrammetry. An important issue in this area is determining the elements of exterior orientation of image data acquired at low altitudes. The article presents selected mathematical methods (TGC, TIC, TAD) of estimating elements of exterior orientation for image data obtained at low altitudes. The measurement data for the experimental test were recorded by the Unmanned Aerial Vehicle platform Trimble UX-5. In the framework of the test photogrammetric flight, the authors obtained 506 images and navigation data specifying the position and orientation of the Unmanned...
The History of the Transport System Development and Future with Sharing and Autonomous Systems
Geza Katona, Janos Juhasz
Communications - Scientific Letters of the University of Zilina 2020, 22(1):25-34 | DOI: 10.26552/com.C.2020.1.25-34
The world today is rapidly changing with the spread of automation. Moreover, urban life is more and more common and the number of inhabitants is rapidly growing. This time is the renaissance of bicycle-based vehicles, especially of electric power assisted bicycles. Vehicle sharing is also getting more popular. These progresses will have a crucial effect on traditional transportation networks. Moreover, the traffic volume, parking facilities and public space usage can be drastically modified. A research data is introduced from Paris and Lisbon, which helps to forecast the effect of the autonomous and sharing systems. This evolution can be advantageous,...
Conditions for the Development of Public-Private Partnership PPP - Analysis Based on an Example of Transport Infrastructure in Poland
Beata Zagozdzon
Communications - Scientific Letters of the University of Zilina 2020, 22(1):35-41 | DOI: 10.26552/com.C.2020.1.35-41
Transport infrastructure is not currently the domain of activity of solely the public sector. Governments entrust the provision of services or realization of investment tasks to private entities and the form of involvement of private investors may be the public-private partnership PPP. Successful implementation of the PPP projects requires appropriate economic, legal, institutional and social conditions. The article identifies these determinants based on the literature on the subject and then their analysis in relation to conditions of operation and market development of the PPP projects in the area of transport infrastructure in Poland. The...
Mechanical Engineering in Transport
Effects of Boundary Conditions on the Modal and Spectral Properties of the Shaft
Petr Hruby, Tomas Nahlik, Dana Smetanova
Communications - Scientific Letters of the University of Zilina 2020, 22(1):42-47 | DOI: 10.26552/com.C.2020.1.42-47
Influence of boundary conditions (i.e. mounting type of shafts ends) on spectral and modal properties is studied in this paper. Cases with joints at both ends and with joint at one end and fixed end are described in detail. The vibration problem of rotating shaft is generalized to problem of vibration of the shaft in the rotating plane. The problem is illustrated on testing models. The real mounting type of shafts is presented.
Classical Solution and Edge Effect in the Problem of Stability of an Axially Compressed Cylindrical Shell
Guyk A. Manuylov, Sergey B. Kosytsyn, Maksim M. Begichev
Communications - Scientific Letters of the University of Zilina 2020, 22(1):48-54 | DOI: 10.26552/com.C.2020.1.48-54
The classical solution for critical stresses in the problem of stability of a circular longitudinally compressed cylindrical shell consists of two terms, reflecting the ability of the shell to resist buckling due to bending and membrane deformations. However, with usual boundary conditions the classical solution appears only with the absence of the Poisson expansion of a shell. With a non-zero Poisson's ratio, an axisymmetric edge effect presents. It reduces the critical load and causes the initial arrangement of its own forms to change as the load increases.
Effect of Phosphating Temperature on Surface Properties of Manganese Phosphate Coating on HSLA Steel
Jana Pastorkova, Martina Jackova, Filip Pastorek, Zuzana Florkova, Juliana Drabikova
Communications - Scientific Letters of the University of Zilina 2020, 22(1):55-61 | DOI: 10.26552/com.C.2020.1.55-61
A phosphating process modified for a high-strength low-alloy (HSLA) steel was performed at various temperatures and influence on the surface properties of the Domex steel covered by manganese phosphate (MnP) was investigated by electrochemical corrosion tests supported by a photo documentation performed by the SEM. Corrosion measurements were performed in 0.1M NaCl solution at 22±2 °C using electrochemical impedance spectroscopy and potentio-dynamic polarisation in order to obtain thermodynamic and kinetic corrosion characteristics and individual elements of equivalent circuits. It is that a temperature of the phosphating process has a very...
The Fault Tree Analysis of Causes of the Welded Pipes Failures in Exploitation
Ruzica Nikolic, Dusan Arsic, Aleksandra Arsic, Zivce Sarkocevic, Dragan Cvetkovic, Branislav Hadzima
Communications - Scientific Letters of the University of Zilina 2020, 22(1):62-70 | DOI: 10.26552/com.C.2020.1.62-70
Premature failure or damage of parts and components of the oil and gas well piping, as well as pipelines for transport of oil and gas, are generally caused by the simultaneous influence of a large number of technological, metallurgical, structural and exploitation factors. Therefore, the convenient structural solutions, which provide the mechanical safety of parts and integrity of structures, can be realized only through total comprehension of their behavior in various operation regimes. Importance of technical diagnostics for monitoring and state analysis of welded pipes/pipelines in oil industry is considered in this paper. An analysis of causes...
Electrical Engineering in Transport
Monitoring of Data Transmission and Changes in Values of Electromagnetic Field in Living Environment
Miroslav Kohan, Miroslava Spronglova, Nadezda Visnovcova, Jakub Misek, Gabriela Spanikova, Viera Jakusova, Jan Jakus
Communications - Scientific Letters of the University of Zilina 2020, 22(1):71-76 | DOI: 10.26552/com.C.2020.1.71-76
A crucial aspect concerning the intelligent transport systems is data transmission between vehicle and central control and information systems. Transportation needs a reliable system of data transfer based on GSM or WiFi networks. However, these networks employ a wide range of different frequencies which can be harmful to the health of drivers. The detrimental effect of electromagnetic radiation can negatively affect the process of transportation. This study determines the intensity of electric field levels (E) of the radiofrequency electromagnetic field (RF EMF) during the data transmission through the 3G, 4G and local WiFi networks, comparing them...
Basic Comparison And Evaluation Of Functionality AC-AC Matrix Converter Concepts For HEV Vehicle - Part I
Branislav Dobrucky, Slavomir Kascak, Michal Prazenica, Roman Konarik
Communications - Scientific Letters of the University of Zilina 2020, 22(1):77-83 | DOI: 10.26552/com.C.2020.1.77-83
The paper deals with the direct AC-AC propulsion system and compares two matrix converter concepts with fivephase traction induction motors (IM) for the hybrid electric vehicle (HEV) including electronic differential. The first one consists of [3x5] matrix converter and [3x1] active PWM rectifier (4Q-converter) for full power performance. The second one comprises one [3x5] matrix converter for full power and auxiliary [0x5] matrix converter for partial output power. Configurations of [3x5] + [0x5] MxC converters with five-phase motor(s) are not analyzed in available literature so far. The advantage of the proposed connection is in supposed higher efficiency...
Management Science and Informatics in Transport
Projecting of Urban Transport Infrastructure Considering the Human Factor
Natalia Davidich, Andrii Galkin, Vladimir Sabadash, Igor Chumachenko, Tatyana Melenchuk, Yurii Davidich
Communications - Scientific Letters of the University of Zilina 2020, 22(1):84-94 | DOI: 10.26552/com.C.2020.1.84-94
Projecting of urban transport infrastructure, which forms a comfortable habitat and development of territories, is impossible without forecasting the parameters of transport and passenger flows. These parameters are formed under the influence of the subjective choice of urban residents on the routes along the road and route network. The study aims to identify factors affecting the distribution of transport and passenger flows through the existing urban transport network. It is revealed that the gravity function of employees of city-forming enterprises, which determines the emergence and absorption of transport and passenger flows of the city districts,...
The System of Facial Recognition in the Infrared Range
Daniil A. Loktev, Alexey A. Loktev, Alexandra V. Salnikova
Communications - Scientific Letters of the University of Zilina 2020, 22(1):95-101 | DOI: 10.26552/com.C.2020.1.95-101
In this paper, a new approach is introduced upgrading the complex object recognizing monitoring system up to the image processing system capable of operating both in the visible and the infrared wavelength ranges. For this purpose, both new algorithmic software and user interface are provided that require from the operator neither special knowledge, nor specific competencies in the fields of object detection, tracking and recognition, while allowing determining the thermal imager parameters necessary for constructing a high-quality image of an object. There are formulated the conditions required for obtaining such image that, by its quality, would...
Safety and Security Engineering in Transport
Modelling Resilience of the Transport Critical Infrastructure Using Influence Diagrams
Michal Titko, Jan Havko, Jana Studena
Communications - Scientific Letters of the University of Zilina 2020, 22(1):102-118 | DOI: 10.26552/com.C.2020.1.102-118
The article discusses the possible impact of disasters on functionality of the transport critical infrastructure elements by overcoming their resilience. The aim of the article is to provide an appropriate approach to the resilience measurement through understanding of this close relationship. It was achieved by using combination of (1) a decisiontheoretical approach based on Influence Diagrams, which was used as a tool to model functionality disruption level of transportation network elements after disaster impact and (2) the time decomposition of the functionality disruption duration of these elements. Based on this approach, the transportation network...
Travel and Tourism Studies in Transport Development
The Innovative Approach to Risk Management as a Part of Destination Competitiveness and Reputation
Marica Mazurek
Communications - Scientific Letters of the University of Zilina 2020, 22(1):119-127 | DOI: 10.26552/com.C.2020.1.119-127
The aim of this paper is a critical discussion on application of a framework for tourism disaster management and the response of governments and communities to crises and disasters. Perception of danger and threat might be decisive factors, which could undermine image, reputation, and competiveness of a country. It might have also a decisive influence on the performance of a country from the economic point of view and especially influence on service provisions, for instance infrastructure (transportation), safety and security. The conceptual approach to research is based on analysis and discussion of the applied models of crisis management in tourism....