Browsing by Author "Dižo, Ján"

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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.
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.
DERIVATION OF A SIMPLIFIED MATHEMATICAL MODEL OF A DMU’S POWERTRAIN
(VTS pri Žilinskej univerzite v Žiline, 2023) Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Molnár, Denis
Recently, railway transport means can be divided to two main groups depending on the source of the energy. Although dependent traction rail vehicles are more and more popular and many European countries endeavour to build new and new track form them, they cannot operate in every corner of the country [1, 2]. There are regions of countries, where the building of track with electrical network is it is not worth it, it is too difficult or there are other reasons not to not to expand the electrical network for electric rail vehicles [3, 4]. Independent traction rail vehicles are nowadays the most known as train units.
DERIVATION OF A SIMPLIFIED MATHEMATICAL MODEL OF A RAIL VEHICLE POWERTRAIN WITH A HYDRODYNAMIC CONVERTER
(VTS pri Žilinskej univerzite v Žiline, 2023) Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Lovska, Alyona; Kravchenko, Oleksandr
In these days, railway transport is one of the most often used kind of transport of people and goods for shorter as well as longer distances. This is not only in many European countries, but also in other part of the world. Day by day people commute to work and to home by railway transport means, such as subway systems, light rail transits as well as by other kinds of railway transport means. The railway transport has several advantages, which make it effective, reliable, and sustainable in comparison with other kinds of transport [1]. On one hand, there are rail vehicles, which are powered from power line. On the other hand, there are rail vehicles, which has own source of power. The rail vehicles of the first group are called as dependent traction vehicles. The rail vehicles, which belong to the second group, are called independent traction vehicles. It is so-called a diesel multiple unit (abbr. DMU), it is a multiple-unit train, and it is powered by an on-board diesel engine. An DMU does not need to include a separate locomotive, therefore, an engine is incorporated into one or even in more of wagons. There is usually applied a diesel combustion engine, but, nowadays, some other alternative sources of energy are tested [2-4]. These diesel-powered single unit railway vehicles are further classified depending on their transmission type. In principle, there are recognized following types of DMUs: diesel mechanical multiple unit (abbr. DMMU), diesel-hydraulic multiple unit (abbr. DHMU) and diesel-electric multiple unit (abbr. DEMU).
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.
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.
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.
Konštrukčný návrh mechanizmu skrutkového manipulátora turniketu sypkých materiálov
(Žilinská univerzita v Žiline, 2023) Molnár, Denis; Blatnický, Miroslav; Dižo, Ján; Ishchuk, Vadym
The article is the next step in the ongoing research regarding the incorporation of the proposed bulk material turnstile assembly into an existing production line serving the food industry for bagging powdered milk. The main goal of this contribution is the presentation of the structural design and related technical calculations of the screw manipulator as part of the turnstile for loose materials. The proposed mechanism will enable precise manipulation of the turnstile, especially when it is necessary to clean the pipe connected to the turnstile. Such handling is relevant nowadays due to increasing the safety of maintenance of machines and equipment and due to reducing the physical load of maintenance workers. The results prove the appropriateness of the use of the given structural design and are the basis for further research in the given area. The results will be implemented in the form of boundary conditions for the numerical analyses of the connecting elements of the frame carrying the entire carriage with the turnstile (the frame forms a path for the carriage) and also for numerical calculations of the frame itself. The goal is to achieve a state where the entire structure is safe for the operator during maintenance and also for its surroundings during normal operation.
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.
Manévrovateľnosť a stabilita pohybu kĺbového autobusu, systém HST
(University of Žilina, 2023) Sakhno, Volodymyr; Gerlici, Juraj; Kravchenko, Oleksandr; Poljakov, Viktor; Chovcha, Iryna; Dižo, Ján
The mathematical model of a hinged-rear bus with a system of turning a hook-and-loop section for a dynamic way of turning is broken down. For the developed model, indicators of manoeuvrability and stability of the bus were appointed. The input of the design parameters of the bus and the trailer, the transfer ratio of the control drive and the magnitude of the galvanic moment to the indicators of the manoeuvrability of the bus are analysed. On the basis of the results, in the analysis of the rational values of the gear ratios, which ensure the proximity of the trajectories of the characteristic points of the bus and the trailer, the value of the gear ratio of 0.85 was selected, which ensures the minimum value of the RMK.
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.
Návrh elektrického mechanizmu otáčania výložníka stĺpového žeriava pre manipuláciu s kalovými čerpadlami
(Žilinská univerzita v Žiline, 2023) Blatnický, Miroslav; Dižo, Ján; Molnár, Denis; Ishchuk, Vadym
The article is a continuation of the issue of the technical solution of the hinge for handling sludge pumps in the Jaslovské Bohunice nuclear power plant. The main goal is the design of the electric jib rotating mechanism. It was based on the previous proposal for placing the boom consisting of a dimensional calculation of the new support column and the proposal for placing the boom on this column. The save consisted of two bonds. The upper support of the boom was solved using a rolling bearing fixed in the upper part of the column. The bottom bearing contains an axial plain bearing and a fixed gear as part of the rotating mechanism. In the next step, it is necessary to design the attachment of the selected electric motor with a planetary gearbox and a pinion for this construction. The priority in the design will be mainly to observe the axial distance of the gears, but also to consider the mounting method given by the manufacturer and the torque generated by the engine. A holder in which the motor is attached and then attached to the structure will be designed. Thanks to this, the axial distance will be fulfilled. In addition to supporting the motor, the holder also serves as a radial bearing lock, preventing the bearing from being accidentally pulled out. The result of calculations and designs will be 2D diagrams and 3D visualization of the new construction.
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.
NORMATIVE ANALYTICAL CALCULATION OF STB TECHNOLOGY BOLTED JOINT FOR 661 SERIES RAILWAY VEHICLES
(VTS pri Žilinskej univerzite v Žiline, 2023) Blatnický, Miroslav; Molnár, Denis; Dižo, Ján; Ishchuk, Vadym
With increasing improvements, the design and technical characteristics of the vehicles along with their equipment change and advance as well as the train communication system [1]. The European Rail Traffic Management System (ERTMS) is the fundament of interoperability of railway transport in Slovakia. The purpose of mentioned system is to improve interoperability and performance of modern railways. The technically oriented basic project ETCS – the unified European Train Control System – is practically based on ERTMS. The ETCS aims to ensure the transmission of information from control systems in stations (or in sections between stations) to the driving vehicle [2-4].
THE NVH ANALYSIS IN RAIL VEHICLES: A LITERATURE REVIEW
(VTS pri Žilinskej univerzite v Žiline, 2023) Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym; Molnár, Denis; Semenov, Stanislav; Mikhailov, Evgeni
Railway transport represents one of the main transportation kind of transport of these days to transfer both passengers and goods. Every day people commute to work and back home using railway transport in a form of subway systems, light rail transits and other types of rail transport. These types of railway transport can create noise both to the passengers inside of the train as well as to the environment [1, 2]. If the pay is attended to noise when a human is on a board of a train, there are more than one noise source that one can hear. The main sources for interior noise in a rail vehicle are turbulent boundary layer, air conditioning noise, engine (or powertrain), auxiliary equipment, rolling noise and aerodynamic noise from bogie [1, 2]
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.
Orgány riaditeľnosti a stability letúnov, 2. časť
(University of Žilina, 2023) Solčanský, Sebastián; Dižo, Ján; Blatnický, Miroslav; Ishchuk, Vadym
This paper deals with flight control and stability surfaces, which is a comprehensive overview of control and stability surfaces of an aeroplane, especially three main control surfaces elevator, ailerons and rudder. These are analysed from the perspective of functions, locations, divisions and aeromechanics. Part of the paper is dedicated to the definition of aircraft, the division of aircraft and the structure of the aeroplane.
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.
Skúmanie jazdných vlastností koľajového vozidla a vzájomného pôsobenia kontaktu koleso/koľajnica pomocou simulačných výpočtov
(Žilinská univerzita v Žiline, 2023) Šťastniak, Pavol; Gerlici, Juraj; Dižo, Ján; Blatnický, Miroslav; Kravchenko, Kateryna
The paper deals with the dynamic analysis and evaluation of the driving characteristics of the selected railway vehicle through computer simulations on virtual and mathematical models. Approaches and methodology from the point of view of creating a virtual model of a railway vehicle as a multi-body system are described in detail., its components and their interrelationships, with the help of which it is possible to obtain the results of a simulated driving of a vehicle with specified parameters of the mechanical system of the vehicle and the track. Practical calculations are performed using the Simpack computer program.
Stanovenie úspory energetických nákladov na pohon vlaku znížením jazdného odporu
(Žilinská univerzita v Žiline, 2023) Panchenko, Sergii; Gerlici, Juraj; Lovska, Alyona; Ravlyuk, Vasyl; Dižo, Ján
Examining the mechanical part of the braking systems of railway vehicles allowed us to find out that the brake blocks of the most freight cars are pressed by their upper ends against certain wheel surfaces when the brakes are released. This causes additional resistance to the movement of the train and also causes significant damage to the railway infrastructure of Ukraine in the case of freight traffic. To eliminate the friction between the brake block and the wheel when the train moves in the traction mode and when using inertia, it is advisable to use a modernized device developed according to the UkrDAZT technology, which allows to reduce the running resistance of the train. This leads to a reduction in the consumption of fuel and electricity for the propulsion of trains and at the same time allows to reduce the operating costs of rail transport for energy consumption.