Univerzitná knižnica - Vedecké odborné časopisy

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Author: search.filters.author.Blatnický, MiroslavStart date: 2023

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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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    Odvodenie matematického modelu hnacieho mechanizmu pre pohon prídavných zariadení dopravného prostriedku
    (University of Žilina, 2023) Dižo, Ján; Ishchuk, Vadym; Lovska, Alyona; Blatnický, Miroslav; Molnár, Denis
    The article is focused on a derivation of a mathematical model of a drive mechanism of for a drive of an additional devices of a transport mean. Additional devices are inseparable part of lorries, buses as well as railway vehicles, such as locomotives with independent traction. These additional devices serve for drive of compressors or other similar devices. The mathematical model is derived by means of the Lagrange’s quations of the second kind method. After finding the energies, the method of the reduction of mass and force quantities to the chosen part. In this case, it is reduced to the drive shaft of the considered mechanism. The presented mechanism is described by means of one equation of motion. This equation can be solved by means of the Matlab software. The last part of the article additional includes illustrations of the solved mechanism created in the Simpack multibody software, which can be analysed and the results can be compared with the results obtained from the Matlab software.
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    Posúdenie stability lesného kolesového traktora vybaveného hydraulickou rukou
    (University of Žilina, 2023) Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Lovska, Alyona; Fidrik, Filip
    Wheeled forests tractors are inseparable part of a forest economy. Wheeled forests tractors serve for logging of logs in forests. Current wheeled forests tractors are usually equipped with hydraulic arms, which allow to expand the utility of such tractors. A tractor with a hydraulic arm can handle with wood logs without a need additional forest machine, which helps to reduce costs. On the other hand, it is necessary to analyse tractors abilities, which has such an additional equipment. This article is focused on assessment of stability of a heeled forest tractor, which is equipped by such a hydraulic arm. As the hydraulic arm changes the centre of gravity of an entire tractor, mainly with the load, safe operation of the tractor needs to know limit conditions of stability under the maximal load and in the given slope inclination.
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    Analýza jazdných vlastností modifikovaného vozidla a jeho komponentov v dôsledku zmeny pohonného ústrojenstva a ovplyvnenie vzájomného pôsobenia kontaktu koleso/koľajnica
    (University of Žilina, 2023) Dižo, Ján; Ishchuk, Vadym; Lovska, Alyona; Blatnický, Miroslav; Solčanský, Sebastián
    The presented article is focused on analysis of running properties of a modified railway vehicle and its components due to a change of the powertrain and influence of the mutual effects in a wheel/rail contact. The modification of a vehicle consists in a change of a standard diesel-electric powertrain by a new powertrain, which includes as a source of power the hydrogen fuel cells. This modification represents a quite significant modification of a vehicle structure, mainly a change of mass and position of centre of gravity individual articles of a vehicle. The analysis of running properties is performed by means of simulation computations in a commercial simulation software Simpack. Simulation model of a vehicle is called as a multibody model. This model consists of rigid bodies, which are connected by flexible modelling elements. Simulation analyses are performed for an original vehicle and for vehicle with hydrogen fuel cells. There are analysed cases of running on two types of tracks. There is found oud based on the obtained results, that the modified vehicle with the hydrogen cells has similar force distribution in a wheel/rail contact, however, the axle load of the modified vehicle does not meet required criteria.
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    Matematický model pohonnej sústavy koľajového vozidla
    (University of Žilina, 2023) Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Molnár, Denis; Solčanský, Sebastián
    The presented research is aimed at the derivation of a mathematical model of diesel-mechanical drivetrain of a rail vehicle. It is derived by means of the Lagrange’s equations of the second kind. The derived mathematical model allows to understand the essential principle of the derivation of the mathematical model of the diesel-mechanical drivetrain of a rail vehicle, an application of the numerical mathematical methods for the solving the equations of motion and for evaluation of the wanted outputs quantities, such as waveforms of revolutions and torques of shafts and others.
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    Konštrukčný návrh rámu korby pre jednonápravový príves za traktor
    (University of Žilina, 2023) Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Molnár, Denis; Kurtulík, Jakub
    This article is focused on the results of the research, which is intended to design of a single-axle tipping tractor trailer. The trailer consists of two main parts, a frame and a superstructure. Both parts of the trailer must undergo strength analyses under determined loading conditions. While results of strength analyses of the frame were already presented on the previous event, this work shows an overview of the strength analysis of the tipping superstructure of the trailer. The structure has been analysed under static loads and dynamical effects have been considered by means of a dynamic coefficient. The task has been performed by application of the Finite Element Method (FEM). Some chosen load cases have been analysed and the distribution of stresses in the structure has been evaluated. Results have shown that the designed structure of the tipping superstructure is able to withstand the given loads and it can be used in practice.