Communications - Scientific Letters of the University of Zilina, 2023 (vol. 25), issue 4
Operation and Economics in Transport
Solution to the Chicken-Egg Dilemma of Electric Mobility for Indian Cities: A Roadmap to Clean Energy
Ruchi Singhal, Apurvkumar Desai, Chetan R. Patel
Communications - Scientific Letters of the University of Zilina 2023, 25(4):A147-A163 | DOI: 10.26552/com.C.2023.066 
Since the electrical vehicles (EVs) are infrastructure-dependent technology, their penetration faces the problem of lacking recharging infrastructure. Thus, there is a dilemma of chicken-egg in the penetration of EVs and their charging infrastructure for the decision-makers. The article examines the e-mobility scenario of 3 Indian cities to understand issues and challenges in implementing EVs. The study suggests a co-diffusion strategy for the EVs and charging infrastructure. Firstly, the priority EV segment has been decided based on the transport mode preference. Then, suitability of charging facilities according to the segment of the EVs has been...
Improving the Management of Operations of the E-Scooter Services in Sicily: A First Step of a Descriptive Statistical Survey
Tiziana Campisi, Chiara Vianello, Emre Kuşkapan, Muhammed Yasin Çodur, Giulia De Cet
Communications - Scientific Letters of the University of Zilina 2023, 25(4):A164-A174 | DOI: 10.26552/com.C.2023.072
The recent pandemic has changed the modal choices of users in the urban context, highlighting in the last two years an increase in the diffusion of electric scooters, which is not homogeneous in the Italian context. At the beginning of 2020, the first e-scooter services were launched in Sicily, with the city of Palermo leading the way. A survey was therefore conducted in Sicily involving approximately 550 regular users of e-scooter services. The descriptive statistical analysis undertaken compared three different periods pre, during and post pandemic, with particular attention to the gender and age gap and different trends in the diffusion of multimodality....
Smart City and Urban Logistics - Research Trends and Challenges: Systematic Literature Review
Jan Chocholáč, Tomáš Kučera, Dana Sommerauerová, Roman Hruška, Stanislav Machalík, Jiří Křupka, Jaroslava Hyršlová
Communications - Scientific Letters of the University of Zilina 2023, 25(4):A175-A192 | DOI: 10.26552/com.C.2023.076
The paper presents a systematic quantitative and qualitative literature review and classification of the last decades resources for a comprehensive and coherent view of smart city and urban logistics research trends and challenges. The review fully respects a six-step systematic literature review guideline and covers ninety-nine peer-reviewed articles from Web of Science Core Collection database.
Mechanical Engineering in Transport
Development and Performance Investigation of the Direct Brushless Torque Motor
Marek Franko, Jaroslav Záruba, Jaroslav Rajníček, Martin Hraško, Michal Frivaldský
Communications - Scientific Letters of the University of Zilina 2023, 25(4):B268-B277
The paper deals with the brushless torque motor, that was designed for precise positioning device to substitute servo drive for high torque and low speed application. It describes the design, basic parameters as well as the analysis of torque characteristic. The paper also presents the results of realized measurements. Finally, the parameters of the brushless torque motor and servo drive applicated in precise positioning device are compared. A series of measurements like measurement of torque characteristics, loading characteristics and also measurements of drive performances are presented in this paper.
Improvement of the Soft Containers Use in Transportation of the Bulk Cargo
Stanislav Semenov, Evgeny Mikhailov, Oleksandr Kravchenko, Ján Dižo, Miroslav Blatnický, Vadym Ishchuk
Communications - Scientific Letters of the University of Zilina 2023, 25(4):B278-B284 | DOI: 10.26552/com.C.2023.064
The advantages and disadvantages of using the soft containers for cargo transportation are analyzed. The issues of the use of soft containers in transport and technological schemes for the supply of bulk goods are considered. Approaches to the rational selection of parameters of soft containers, during the transportation of bulk cargoes, taking into account the characteristics of the transported cargoes, are defined.
Thermographic Mapping of the Melt Pool of the Laser Powder Bed Fusion Process
Jiři Sika, Vladimír Kindl, Michal Křížek, Tomáš Kavalíř, Michal Frivaldský
Communications - Scientific Letters of the University of Zilina 2023, 25(4):B285-B293 | DOI: 10.26552/com.C.2023.065
The article describes an advanced test stand for measuring temperatures during the 3D printing for additive manufacturing. Based on mathematical procedures, it analyzes the impact energy of the laser beam used in metal 3D printing.
Increasing the Efficiency of Transportation of Cargoes with a Cylindrical Shape
Evgeny Mikhailov, Stanislav Semenov, Maxim Kovtanets, Ján Dižo, Miroslav Blatnický, Vadym Ishchuk
Communications - Scientific Letters of the University of Zilina 2023, 25(4):B294-B300 | DOI: 10.26552/com.C.2023.067
One of the most important directions of intensification and increasing the efficiency of the transportation process is to improve the use of the carrying capacity and capacity of vehicles. For this, it is necessary to the choose rational schemes for loading the cargo into cargo places of the rolling stock. The possible options for loading the vehicle body with cylindrical loads, which are transported when they are installed on the end, are considered. The conducted analysis showed that there are several typical schemes for loading such cargoes. Analytical dependencies have been obtained that allow choosing a rational loading scheme when transporting...
Influence of the Design Parameters of a Screw Feeder Loading Mechanism on the Torque Value of the Drive Shaft
Vasyl Vasylkiv, Dmytro Radyk, Mykola Stashkiv, Larysa Danylchenko
Communications - Scientific Letters of the University of Zilina 2023, 25(4):B301-B314 | DOI: 10.26552/com.C.2023.068
The processes of material capture and movement in a screw feeder are characterized by significant loads due to the pressure of a vertical load column, which creates additional resistance to the movement of the material, overcoming which leads to unproductive energy consumption. The paper aims to study the influence of the design parameters of the loading mechanism on the torque on the drive shaft of a screw feeder. The results of experimental studies and computer simulation of the design parameters of the loading mechanism relation (the length of the loading zone, the inclination angle of the rotating wall of the loading nozzle, its displacement value...
Interaction of the TE33a Diesel Locomotive and the Railway Track on Curved Section with Radius 290 m
Seidulla Abdullayev, Gabit Bakyt, Azhar Kamzina, Kurmangazy Sarsanbekov, Assel Abdullayeva
Communications - Scientific Letters of the University of Zilina 2023, 25(4):B315-B326 | DOI: 10.26552/com.C.2023.069
The purpose of the research was an experimental study of the dynamic processes of interaction between a TE33A diesel locomotive and a railway track when passing along a curved section with a radius of 290 m. To study the dynamic and driving properties of the rolling stock, the analysis of the experimental data obtained was carried out. When performing the study, the following results were obtained: the indicators of the frame forces of each wheel were determined when moving the TE33A locomotive along a curve with a radius of 290 m; the coefficients of the vertical dynamics of the second suspension stage when moving the TE33A locomotive along a curve...
Experimental Studying the Belt Conveyor Roller Wear Dependence on the Intensity of Technological Dust Accumulation in Open Pit Mining
Adilzhan Kuanyshbayev, Alexander Rozhkov, Nina Gorshkova, Kairosh Nogayev
Communications - Scientific Letters of the University of Zilina 2023, 25(4):B327-B338 | DOI: 10.26552/com.C.2023.071
The paper presents the research on revealing the causes of belt conveyors downtime at open-pit mining operations. By results of researches it is established that the reasons of the above mentioned problems are technological dust formed at crushing of mineral ore, further loading and unloading, and also at transporting by conveyors. Dense dust-air mixture settling on the rotating mechanisms of conveyors, gets into the bearing units and on the surfaces of friction gears, which accelerates the process of wear of parts several times.
Electrical Engineering in Transport
Supercapacitor Module Sizing concerning Operational Constraints of the Power Converter
Michal Frivaldský, Zdeno Biel, Marcel Pčola, Gabriel Kácsor, Marek Franko, Juraj Surový
Communications - Scientific Letters of the University of Zilina 2023, 25(4):C62-C69 | DOI: 10.26552/com.C.2023.063
In this paper, the focus is given on the potential use of the supercapacitor component for peak power delivery, required during operation. Potential application use considered here is electric drive for robotic arm motorization. Automatization of industrial and manufacturing processes requires increasing demands on the use of industrial robots. The motion profiles of such system, requires within the operation peak power demand. The supply system can be composed from DC bus power supply, or combined with energy storage system. Combination with proper energy storage component, can improve energy efficiency and provide peak power for the requirements...
The Architecture of the on-Board Power System of a More Electric Aircraft
Lucjan Setlak, Rafał Kowalik
Communications - Scientific Letters of the University of Zilina 2023, 25(4):C70-C89 | DOI: 10.26552/com.C.2023.073
Currently, various systems and devices for on-board equipment of modern aircraft are undergoing extensive transformations, particularly in terms of powering electrified aircraft. The main goal of authors of this article was to conduct an analysis of the selected electrified aircraft architecture in the scope of the HVDC system, among architectures in the 540 V voltage range (± 270 VDC) and 350 V, creating a mathematical model and making the necessary tests and simulation studies on the developed model. In the above aspect, article presents selected test results of a proposed system consisting of aircraft generators with changing speeds, which...
Civil Engineering in Transport
Exploring the Traffic Congestion and Improving Travel Time Reliability Measures in Heterogeneous Traffic Environments: A Focus on Developing Countries
Satya Ranjan Samal, Malaya Mohanty, Piotr Gorzelańczyk
Communications - Scientific Letters of the University of Zilina 2023, 25(4):D91-D102 | DOI: 10.26552/com.C.2023.074
Traffic congestion is a pervasive issue that affects urban areas worldwide. This study investigates congestion on urban roads in an Indian smart city. Video graphic technique was employed to collect data across various traffic volumes. Travel time for different vehicle categories was estimated, and the travel time reliability congestion index was assessed. Multiple linear regression modelling was utilized to assess the attributes influencing congestion. Traffic signal synchronization and enforcement of traffic regulations, decentralization of important offices, and regulating roadside activities received strong recommendations from the majority of...
Safety and Security Engineering in Transport
Accident Response Analysis of Six Different Types of Distracted Driving
Alireza Ansariyar, Abolfazl Taherpour, Parisa Masoumi, Mansoureh Jeihani
Communications - Scientific Letters of the University of Zilina 2023, 25(4):F78-F95 | DOI: 10.26552/com.C.2023.070
The study analysed the driving performance and visual impairment of 92 participants under six different distraction scenarios. Using a car simulator and by simulating two real-world roads, a variety of data was collected, including driver behavior and vehicle-related data. According to a statistical analysis conducted during and before the distraction on road 1, females significantly increased speed more than males when using a hand-held call (=scenario #3), hands-free call (=scenario #4), text (=scenario #6), and voice command text (=scenario #7). The Kruskal-Wallis H test was performed on gender, age, vehicle speed, throttle, and offset from the...
Trends in Traffic Accidents of Firefighting Vehicles and Their Evaluation
Ladislav Jánošík, Izabela Šudrychová, Ivana Jánošíková, Marek Cochlar, Martin Tomášek
Communications - Scientific Letters of the University of Zilina 2023, 25(4):F96-F107 | DOI: 10.26552/com.C.2023.075
The Fire Rescue Service of the Czech Republic is a security force whose primary task is to protect the lives and health of the population from fire and other emergency and critical situations. Members of the Fire Rescue Service of the Czech Republic need special firefighting appliances for performing these public services. The first-response firefighting vehicles are professionally denominated as firefighting vehicles. These vehicles are used to transport units of firefighters, fire extinguishers and a technical equipment to a scene of an intervention. Traffic accidents occur occasionally while an emergency drive. Traffic accidents always have a negative...