Žilinská univerzita v Žiline

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Author: search.filters.author.Dižo, JánStart date: 2023

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Now showing 1 - 10 of 26
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    Porovnanie systémov prenosu výkonu koľajových vozidiel s nezávislou trakciou
    (University of Žilina, 2025) Bučko, Martin; Samaš, Vladimír; Dižo, Ján; Blatnický, Miroslav
    The article deals with independent traction rail vehicles, mainly the power transmission type. The advantages and disadvantages of different types of power transmission for independent traction vehicles are compared, including the use of a particular type in each category of rail vehicles and a schematic illustration.
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    Systèmes de traction électrique modernes: avantages des moteurs PMSM dans le transport ferroviaire
    (University of Žilina, 2025) Samaš, Vladimír; Bučko, Martin; Gerlici, Juraj; Dižo, Ján; Blatnický, Miroslav
    Currently, there is a growing global emphasis on environmentally friendly transportation, with railway transport being one of the most efficient and sustainable modes of travel. This form of transport is distinguished by low rolling resistance, which leads to reduced energy consumption for both passenger and freight transport. Electric traction, widely used in railway vehicles, can be categorized as either dependent or independent. Dependent electric traction represents an environmentally friendly solution, as it eliminates the need for petroleum based fuels and instead utilizes electricity drawn from the grid. However, this approach is truly ecological only when the electricity is generated from renewable and sustainable sources. Modern electric traction systems rely on electric motors, and this article aims to provide a detailed analysis of the application of permanent magnet synchronous motors (PMSM) in railway transport, particularly in the context of electric traction. PMSM motors are characterized by high efficiency and excellent controllability, making them well-suited for extensive use in railway applications. Their significant potential in this field positions them as a promising solution for future sustainable and efficient transport systems.
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    Súčasný stav prevodoviek s nastaviteľným prevodovým pomerom pri elektrickom pohone
    (University of Žilina, 2024) Blatnický, Miroslav; Samaš, Vladimír; Dižo, Ján
    The scope of this article covers potential technologies for transmission mechanisms with variable gear ratios that can be applied to electric traction. A transmission with an adjustable gear ratio allows for the adaptation of the gear ratio according to usage conditions. By adjusting the gear ratio and consequently the traction forces, we can enhance driving parameters, e.g. improved both efficiency and range. The paper theoretically examines various transmissions with variable gear ratios and compares their parameters in the context of electric drives.
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    Motorové jednotky nezávislej trakcie s jednonápravovým podvozkom
    (University of Žilina, 2024) Bučko, Martin; Dižo, Ján; Blatnický, Miroslav; Lovska, Alyona
    The article analyses the current state of the motor wagons and units with implemented single-axle bogies, operated on local lines as well as abroad. The technical parameters of individual rolling stock were compared. The main goal of the article is to present an overview of independent traction multiple units, which are equipped with a single-axle bogie. There are described rail vehicles used on only in the Slovak Republic, but also in Europe. As the use of this type of rail vehicle is on the decline, this overview reflects the current state in this field of rail vehicle design, at which, information is complemented with corresponding illustrations.
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    Hodnotenie pohodlia jazdy v osobnom vagóne prostredníctvom rovinného dynamického modelu pri zvislom kmitaní
    (University of Žilina, 2024) Dižo, Ján; Lovska, Alyona; Blatnický, Miroslav; Ishchuk, Vadym
    The presented research is focused on a derivation of a mathematical model of a passenger wagon based on a dynamical model in a plane with three degrees of freedom. Vertical oscillation of a passenger wagon is calculated in two different software, namely Matlab and Simpack. It is considered that three degrees of freedom are defined as following: a vertical deflection of a front bogie frame, a vertical deflection of a rear bogie frame (in a running direction) and a vertical deflection of a wagon body. The Lagrange’s equations of the second kind method is used for a derivation of the equations of motion, i.e. for a derivation of a mathematical model of wagon oscillation. Subsequently, the derived equations of motion are solved in the Matlab software as well as in the Simpack software. Both software apply calculation in a time domain. Evaluation of the results is focused on an investigation of ride comfort for passengers. This ride comfort is expressed by the NMV index calculated in five points on a wagon body floor. These calculations come from the formulation defined in the corresponding standard. The results of the NMV indices are presented in the bar graphs based on the numerical values of the NMV indices.
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    Konštrukčný návrh koľajového adaptéra pre ľahké nákladné vozidlo, typ oceľ-oceľ
    (University of Žilina, 2024) Dižo, Ján; Fiačan, Jakub; Lovska, Alyona; Blatnický, Miroslav; Ishchuk, Vadym
    Transportation is a quite complex system for relocation of passengers and goods for longer of shorter distances. Nowadays, a combination of several types of transport is typical for the most countries. Land transport includes road transport and railway transport. There are number of types of vehicles used for these individual kinds of transport. The most of them are able to move only on a road or on a railway track. However, there are a quite narrow group of vehicles, which can move both on a road and on a railway track. There are called rail-road vehicles. In principle, there are derived from road vehicle. The main objective of this rticle is to present an engineering design of an adapter for a light lorry. The work brings the main structural units of the rail-road vehicle and compares its properties with the previous engineering design. Despite, there are rail-road vehicles, this engineering design is characterized, that the adapter allows to set railway wheels to main track gauge.
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    Analýza súčasného stavu problematiky využitia manipulačných zariadení pre potreby skúšobných stavov brzdných komponentov koľajových vozidiel
    (University of Žilina, 2024) Molnár, Denis; Blatnický, Miroslav; Dižo, Ján; Lovska, Alyona
    The paper deals with the current state of the art of the research test stands of braking components of rail vehicles in synthesis to the need of handling equipment utilisation accompanying the research in question. The compact form of the introduced information will be the input material for the design of an original handling device, sophisticatedly designed for the needs of the test stand for rail vehicles brake components testing. The brake test stand is located at the Department of Transport and Handling Machines at the Faculty of Mechanical Engineering of the University of Žilina. The task of proposed handling device will be to facilitate the work of laboratory staff, increase the safety of handling and shorten the preparation time of the measurement process at brake test stand. In addition, a more detailed description of the brake test stand at the Department of Transport and Handling Machines is included in the paper.
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    Návrh koľajového adaptéra typu guma-koľajnica pre ľahké nákladné vozidlo
    (University of Žilina, 2024) Dižo, Ján; Fiačan, Jakub; Blatnický, Miroslav; Lovska, Alyona; Ishchuk, Vadym
    The article is focused on design of a tyre-rail adapter to be mounted on a light road-rail vehicle. The novelty of the design consists in its possibility to change the wheelbase of the vehicle axles for different railway tracks gauges. Then, the considered light vehicle could fulfil various working tasks in a country, where more railway tracks gauges occur. The modified vehicle is a light lorry, which is intended to be used as a versatile and utility vehicle for maintenance purposes and repairing purposes.
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    Determination of the dynamic load of an improved hatch cover of an open wagon during operating modes
    (University of Žilina, 2023) Lovska, Alyona; Gerlici, Juraj; Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym
    The article presents the results of determining the dynamic load of the improved cover of an open wagon under operational conditions. The peculiarity of the manhole cover is that the canvas is formed by the upper and lower sheets, between which, there is an energy-absorbing material with viscous properties. The dynamic load of the cover when a load of 150 kg falls on it was studied. It was determined, that the use of energy-absorbing material contributes to the reduction of the cover load by 21 % compared to a typical original design. The main indicators of the dynamics of an open wagon equipped with improved manhole covers are calculated. The results of the calculations showed that the studied dynamic indicators are within the permissible limits. The conducted studies will contribute to the reduction of damage to manhole covers during operation and the cost of maintaining one wagons.
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    Štúdia vplyvu medziadaptéra na dynamické zaťaženie nosnej konštrukcie plošinového vozňa
    (University of Žilina, 2023) Lovska, Alyona; Gerlici, Juraj; Dižo, Ján; Ishchuk, Vadym
    In order to reduce the dynamic load of the platform wagon, it is proposed to use an intermediate adapter between the frame and the load. The reduction of dynamic loads is carried out due to the dissipative forces that arise in the adapter when the wagon bounces. The results of mathematical modeling of the vertical loading of the platform wagon are given, taking into account the proposed solution. It was established that the accelerations acting on the supporting structure of the platform wagon are reduced by 8.5 % compared to the typical one. The acceleration acting on the load placed on the frame of the platform wagon is 11.8 % lower than that acting on it, taking into account the typical load perception scheme. The peculiarities of determining the strength of the adapter under its vertical load are highlighted. The conducted research will contribute to the creation of developments in the design of modern structures of railway vehicles.