Communications - Scientific Letters of the University of Zilina, 2024 (vol. 26), issue 2
Mechanical Engineering in Transport
Peculiarities of Designing the Frame of a Universal Container Made of Rectangular Pipes
Juraj Gerlici, Alyona Lovska, Mykhailo Pavliuchenkov, Oleksandr Kravchenko
Communications - Scientific Letters of the University of Zilina 2024, 26(2):B72-B79 | DOI: 10.26552/com.C.2024.016 
The features of designing the frame of a universal container made of square pipes are presented in this paper. The two frame loading schemes are taken into account: the effect of vertical loading on the container frame when it is lifted by the upper corner fittings (I loading mode); the effect of longitudinal loading on the frame during transportation by the rail transport (II loading mode). Mathematical modeling was performed to determine the longitudinal loading acting on the container in the II loading mode. The determined acceleration is taken into account when constructing the schemes of force factors that arise in the frame. The strength...
The Service Life Prediction for Brake Pads of Freight Wagons
Sergii Panchenko, Juraj Gerlici, Alyona Lovska, Vasyl Ravlyuk
Communications - Scientific Letters of the University of Zilina 2024, 26(2):B80-B89 | DOI: 10.26552/com.C.2024.017
The analysis of the statistical values of wear of brake pads in operation, based on which a wear model was developed, is presented in this paper. This model can be used for predicting the remaining service life of brake pads according to the wagon mileage. The distribution function of wear on the upper and lower parts of the pad was determined, which made it possible to find the main qualitative characteristics, namely, the wear intensity, the γ-percentage wear, and the average pad wear at a specified wagon mileage. The results of the study can be factored for solving complex engineering problems of excessive wear of composite...
Comparison of the Molding Parameters Effects on Metal Injection Molded Specimens in the Real Experimental and Simulation Environments
György Ledniczky, Zoltán Weltsch
Communications - Scientific Letters of the University of Zilina 2024, 26(2):B90-B98 | DOI: 10.26552/com.C.2024.018
This article presents a technology that is not widely known. Previous research has investigated the effect of metal injection molding parameters on product shrinkage. The technology is mostly limited by the variations caused by deformation, so it is of paramount importance to focus on shrinkage. Consequently, within this study the injection molding simulations with 17-4PH type material was performed and its results were compared to the previously determined curve characters. The results obtained allow conclusions to be drawn regarding the accuracy of the simulation. Changing the parameters of the injection molding process can significantly affect the...
Testing of Railway Equipment for the Impact on the Track and Turnouts
Seidulla Abdullayev, Gabit Bakyt, Assel Abdullayeva, Bakytzhamal Duisembayeva, Yerlan Askenov, Galymzhan Ashirbayev, Rustam Besekenov
Communications - Scientific Letters of the University of Zilina 2024, 26(2):B99-B107 | DOI: 10.26552/com.C.2024.020
The indicators of dynamic qualities that ensure the traffic safety, as well as the permissible impact on the railway track, with the obligatory fulfillment of which the railway rolling stock can be used in the transportation process, are presented in this article. The purpose of this work was to carry out the complex dynamic (running), and the impact on the railway track, tests of the rolling stock, during which simultaneous registration of dynamic processes on the railway rolling stock, and in the elements of the superstructure of the track, is carried out, as well as in elements of turnouts. Dynamic tests were carried out on the track switches from...
Appraisal Reliability of Electromechanical Equipment of Rail Service Car
Ziyoda Mukhamedova Gafurdjanovna, Sherzod Fayzibayev Sabirovich, Dilbar Mukhamedova Gafurdjanovna, Gulshan Ibragimova Ruslanovna, Shokhrukh Kayumov Sharof Ogli
Communications - Scientific Letters of the University of Zilina 2024, 26(2):B108-B117 | DOI: 10.26552/com.C.2024.021
This study conducts an in-depth exploration into the principal factors that influence the reliability of specialized rail cars and auto-rail vehicles. It places a particular emphasis on key performance metrics including the average operational duration prior to failure, the proba¬bility of faultless operation, the rate of failure, and the gamma-percentage resource. Addition¬ally, the paper examines various methodologies for computing these metrics and quantitatively evaluating their respective values. It elucidates how specific units of electromechanical equip¬ment, which operate in conjunction with asynchronous motors and clutches,...
Effect of Environmental Conditions on Curing of Polyurethane Adhesive Investigated with Ftir Analysis
Péter I. Kovács, Zoltán Weltsch, Miklós Berczeli
Communications - Scientific Letters of the University of Zilina 2024, 26(2):B118-B127 | DOI: 10.26552/com.C.2024.024
The use and significance of adhesives in various industries are explored, highlighting the growth of the adhesive market and the crucial role of time in adhesive bonding. The composition of adhesives, particularly polyurethane adhesives (PUR), is detailed, emphasizing their sensitivity to environmental factors, like moisture and UV radiation. Various factors influencing adhesive properties, such as reactivity and curing-induced shrinkage, are discussed, along with the importance of catalysts in adjusting reaction rates. One-component moisture-curable PUR adhesives are presented as versatile and continually improving alternatives in structural adhesive...
Pits Transporting System from Pitter Fruit Machine - Case Study
Łukasz Nowakowski, Piotr Kurp, Michał Skrzyniarz, Sławomir Błasiak, Wojciech Depczyński
Communications - Scientific Letters of the University of Zilina 2024, 26(2):B128-B134 | DOI: 10.26552/com.C.2024.025
The paper presents the construction and technological aspects of a device for pitting fruit, especially cherries, on an industrial scale. The presented work includes design solutions related to the transport of pits removed from pitted fruit, as well as a gravity chute, with an indication of potential operational problems related to the machine design. The authors proposed the use of a screw conveyor, especially in the case of longer drums, to optimize the process. Some analyses are also presented, including friction occurring during the transport of pits. Ultimately, a specific design concept is presented that integrates the screw conveyor with...
Development of the Bonding Technology of Modern Automotive Materials with Environmentally Friendly Solutions
Zoltan Weltsch, Ferenc Tajti, Miklós Berczeli
Communications - Scientific Letters of the University of Zilina 2024, 26(2):B135-B141 | DOI: 10.26552/com.C.2024.026
The significance of bonding technology for modern vehicle structural materials is increasingly acknowledged, driven by the adoption of new materials to reduce weight. This is important not only for quality and economic reasons but to address environmental pollution, as well. Traditional joining methods like riveting, screwing, welding, and brazing, are often unsuitable or limited for modern materials. Soldering, an economical and almost waste-free technology, is becoming more widespread. Through optimization, it achieves a strong, durable bond. There is a potential to favourably alter interface properties, including using high energy density surface...
Electrical Engineering in Transport
Improving the Energy Efficiency of Operation of a Multi-Motor Plate Conveyor in the Steady-State Operation Mode
Adilbek Kazbekovich Kelisbekov, Nurlan Asylkhanovich Daniyarov, Baurzhan Gilymovich Moldabaev
Communications - Scientific Letters of the University of Zilina 2024, 26(2):C1-C8 | DOI: 10.26552/com.C.2024.022
The established mode of operation of the conveyor with a nominal linear load is the most economically advantageous from the point of view of increasing the energy efficiency of mineral transportation, in which the cargo flow with minerals corresponds to the nominal productivity of the conveyor. An increase in the linear load of the working branch of the traction-bearing body to a nominal value reduces the share of unproductive consumption due to which energy savings are achieved for a certain period of time, characterized by its hourly average value.
Civil Engineering in Transport
The Use of Recycled Concrete Powder as Supplementary Cementitious Materials for Manufacturing Concrete
Oussama Douidi, Ahmed Tafraoui, Abdelkadir Makani, Pedro Serna
Communications - Scientific Letters of the University of Zilina 2024, 26(2):D27-D37 | DOI: 10.26552/com.C.2024.019
Construction development is inevitable, while despite its advantages and its benefits, it may lead to several problems related to landfill and its storage, referring to the high volumes of concrete waste currently generated annually, almost 2.0 ton/per capita according to Eurostat. In Algeria, the government has integrated waste management strategy [3] provision to recovering 60 % of construction waste by 2035, which can translate to an urgent need to find innovative ways to recycle concrete waste. One is using those wastes to produce aggregates; however, around 20 % of those aggregates represent fines, wich can lead to several issues if not considered...
Management Science and Informatics in Transport
Estimation of Vulnerable Road User Accident Frequency through the Soft Computing Models
Saurabh Jaglan, Sunita Kumari, Praveen Aggarwal
Communications - Scientific Letters of the University of Zilina 2024, 26(2):E1-E11 | DOI: 10.26552/com.C.2024.023
Accident prediction models are mathematical expressions or algorithms used to determine the causal factors for road accidents and road safety engineers are using these models, as well. Modelling this kind of accident is quite challenging and required good quality of data. The results of the artificial neural network model, Gaussian processes model, and support vector machine model are compared for vulnerable road accident frequency in this study. The accident frequency dataset comprises 218 records, with 146 designated for training purposes and 72 reserved for testing. The model's accuracy was contingent on: the mean absolute error, root mean square...