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Wyszukujesz frazę "Krenicky, Tibor" wg kryterium: Autor

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Tests of selected elements of building components in the light of compulsory requirements
    Autorzy:
    Szweda, Stanisław
    Wojtaszczyk, Marek
    Krenicky, Tibor
    Powiązania:
    https://bibliotekanauki.pl/articles/27324326.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Techniki Górniczej KOMAG
    Tematy:
    steel reinforcement bars
    strength tests
    composite reinforcement bars
    pullout test of bars
    bar adhesion test to concrete
    Opis:
    A procedure of standard strength tests of reinforcement bars conducted at present at the ITG KOMAG is discussed. Taking advantage of the bibliographic review, concerning tests of reinforced concrete with steel reinforcement bars, a possibility of using the KOMAG testing infrastructure to broaden the scope of tests of reinforcement bars was analyzed. Due to a more and more common use of composite bars for reinforcing and strengthening concrete structures, the methods of testing their strength properties are discussed. The conditions enabling to conduct strength tests of composite reinforced concrete bars at the ITG KOMAG are determined.
    Źródło:
    Mining Machines; 2022, 40, 3; 130--140
    2719-3306
    Pojawia się w:
    Mining Machines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Casting machines and properties of Al-Si castings alloys
    Autorzy:
    Ružbarský, Juraj
    Krenický, Tibor
    Maščeník, Jozef
    Coranič, Tomáš
    Powiązania:
    https://bibliotekanauki.pl/articles/2175487.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    die casting
    technological parameters
    machines
    die casting pressure
    pressing speed
    odlewanie ciśnieniowe
    parametry technologiczne
    maszyny
    Opis:
    The paper focuses on the research of holding pressure inside the mould cavity and pressing speed as technological parameters of die casting. The experiments conducted within the frame of the practical part examined the plunger and the pressure or the holding pressure in the mould cavity influencing the mechanical properties of a casting which were represented by ultimate tensile strength and percentage share of porosity of Al-Si castings. The results of experiments and analysis of the measured values proved the relation between pressure, or holding pressure, in the mould cavity and the ultimate tensile strength and porosity of castings. Plunger pressing speed is closely related to mould cavity filling mode which affected the final porosity of casting. It can be assumed that die casting is positively influenced by the increase of ultimate tensile strength and reduction of porosity during the increase of pressure or of holding pressure in the mould cavity. Higher values of holding pressure caused the elimination of pores which resulted in a decrease in the percentage share of pores in the casting and an increase in values of ultimate tensile strength.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 8--34
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Options for solutions of the inlet system into the mold
    Autorzy:
    Ružbarský, Juraj
    Krenický, Tibor
    Maščeník, Jozef
    Coranič, Tomáš
    Powiązania:
    https://bibliotekanauki.pl/articles/27323743.pdf
    Data publikacji:
    2023
    Wydawca:
    STE GROUP
    Tematy:
    pressure casting
    mold construction
    inlet system
    pressure
    odlewanie ciśnieniowe
    konstrukcja formy
    układ wlotowy
    ciśnienie
    Opis:
    The presented contribution points out the possibilities of solving the inlet system, as one of the important factors influencing the final quality of the castings. Due to its design and function, the sprue system influences the process of filling the mold cavity. With the correct design of the sprue system, we achieve the continuity of filling the mold cavity and the elimination of qualitative and quantitative errors caused by non-observance of basic principles in the design of sprue systems. When conducting the experiments, we monitored the mold inlet system, modeling the process of filling the mold cavity and the speed of the liquid metal in the notch and the mold cavity. The results of the experiments show that the speed of the liquid metal when filling the mold is approximately half of the calculated theoretical value.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2023, 12, 2; 57--70
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Blades interaction and non-stationarity of flow in vertical-axial wind turbines
    Autorzy:
    Rozhkova, Ludmila
    Krenicky, Tibor
    Kuznetsov, Eduard
    Nahornyi, Volodymyr
    Powiązania:
    https://bibliotekanauki.pl/articles/2037426.pdf
    Data publikacji:
    2021
    Wydawca:
    STE GROUP
    Tematy:
    wind turbine
    power characteristic
    wind potential
    filling factor
    wind energy utilization
    Opis:
    Until recently, horizontal-axial wind turbines with blades having a wing profile occupied a predominant position in the world wind energy market. But currently, vertical-axial wind units are of increasing interest and this is understandable from the point of view of their important features as: no requirements for the orientation of the wind turbine to the wind, the possibility of placing electrical and other equipment on the ground, no requirements for changes of blade chord installation angle along its length. The article discusses the aerodynamics of the vertical-axis wind turbines: the range of changes of angles of incoming flow attack on the blade, the dynamics of changes in the magnitude of the absolute speed of flow of the blade on a circular trajectory of its movement depending on the turbine rapidity, and also obtained in experiments interaction effect of the blades in the rotor. The experiments were carried out on wind turbines with original blades (basic version), which were designed to eliminate the shortcomings of low-speed rotors Savonius (low coefficient of use of wind energy) and high-speed rotors Darrieus (lack of self-start).
    Źródło:
    Management Systems in Production Engineering; 2021, 4 (29); 280-286
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring of belt floating under controlled belt transmission load
    Autorzy:
    Mascenik, Jozef
    Coranic, Tomas
    Ruzbarsky, Juraj
    Krenicky, Tibor
    Powiązania:
    https://bibliotekanauki.pl/articles/27324381.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Techniki Górniczej KOMAG
    Tematy:
    monitoring
    belt floating
    strength
    belt gear
    tension
    load
    przekładnia pasowa
    napięcie
    Opis:
    The paper focuses on experimental monitoring of tightening and floating of the belt at controlled loading of belt gear. In general, the belt gear is referred to as friction gear in practice the primary function of which is to transfer the performance as a consequence of frictional forces occurring between a driven belt pulley, a driving belt pulley and a flexible element. In experimental measurements, the flexible element is represented by a V-belt. The main advantages of the belt gears are peripheral speed, flexible engagement, silent running, vibration absorption and their price. Standard operation of the belt gear requires correct belt tightening which is achieved by movement of a pulley and a tension roll. At the same time, the belt tightening can be achieved by changing the spacing of the shaft axes used in experiments. In the case of belt gears use, specific principles must be observed. The principles include tightening of the belt with particular force which represents, in fact, primary condition of transmission of motion and force. At rest, the tension of both belt parts is identical. Complex analysis of belt gears was followed by experimental measurements on the stands designed for testing and monitoring of belt gears. For the purposes of monitoring of the belt floating there was a system designed which used a high precision sensor to measure distance between the belt and the sensor. At the same time, a device designed to determine the belt tightening was used as well. All measurements were analysed and collected data and facts were used to determine dependencies possible to be applied when the monitored parameters are evaluated. The results of experimental monitoring of the selected parameters at controlled loading of the belt gear can be useful in practice for designing, checking and maintenance operations.
    Źródło:
    Mining Machines; 2023, 41, 2; 107--118
    2719-3306
    Pojawia się w:
    Mining Machines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New concept of software for calculation of chain gears
    Autorzy:
    Maščeník, Jozef
    Coranič, Tomáš
    Krenický, Tibor
    Ružbarský, Juraj
    Powiązania:
    https://bibliotekanauki.pl/articles/2175493.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    software
    design
    chain gear
    calculation
    strength
    oprogramowanie
    projektowanie
    przekładnia łańcuchowa
    obliczanie
    wytrzymałość
    Opis:
    At present, practically all areas of design activities are supported by computer technology, which can be effectively used in the design of gears, belts and chain transmissions, especially in the field of calculations, as well as graphics solutions. However, their use requires mastering the basic principles of computational procedures contained in the programs in question and, on that basis, critically evaluating computer-generated solutions. The presented paper deals with the design proposal and application of program for calculation and check of chain gears. Although there are currently various programs on the market that can design chain transmissions and perform strength analysis, there is still space for improvement and the creation of these programs. The computing program has been created as a spreadsheet in the working environment of the Microsoft Office program by the Excel application through defined sequences of the individual commands. The program serves for design proposal of a chain drive by means of inserted databases, graphs and tables. In the process of designing and checking the input values are entered such as performance, rotations, and number of wheels. Through calculation the software generates speed of a chain, circumferential speed, tensile force, number of chain links, axial distance, etc. At the same time the paper compares generated parameters with manual calculation of the chain gear.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 47--56
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of concepts of the analytic hierarchy process in decision-making
    Autorzy:
    Krenicky, Tibor
    Hrebenyk, Liudmyla
    Chernobrovchenko, Vadym
    Powiązania:
    https://bibliotekanauki.pl/articles/27315536.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    multicriteria decision-making
    hierarchical analysis
    analytic hierarchy process
    health technology assessment
    Opis:
    The Analytical Hierarchy Process (AHP) is one of the multi-criteria methods with tools that are effective for decision-making in complementary or alternative medicine (CAM). This approach, in combination with other available methods, such as the Utrecht Method, allows medical professionals and patients themselves to take a balanced choice of special treatment and health control. This is particularly important for pregnant women who suffer from nausea and vomiting during pregnancy (NVP). The mechanisms of toxicosis occur, and the way of treatment have certain uncertainties. The decision-making process for therapeutic care must consider several factors, the determination of which is the result of collaboration between the patient and the healthcare provider. This paper presents the results of a decision-making study regarding the use of the ginger medicinal plant in helping a woman with NVP symptoms. The research was conducted using the original questionnaire according to the methodology proposed by the developers of the Utrecht Method. The chosen respondents were healthcare professionals with experience in treating NVP and pregnant women. The Analytical Hierarchy Process (AHP) capabilities in decisionmaking were shown in an example of analyzing the benefits, risks, and side effects of using ginger during pregnancy. The combination of two methodological approaches allowed to successfully connect the proven facts of using CAM therapy with the subjective assessment of all stakeholders. The study demonstrates that this approach successfully uses decision-making by structuring hierarchical decision elements and weighing the criteria involved in the decision-making issue. The article examines the practicality and effectiveness of using AHP when making decisions regarding the treatment and improvement of the condition of pregnant women with NVP, and summarizes the quantitative and qualitative indicators of the effectiveness of this method. The presented combination of two methodological approaches in decision-making allows for choosing an optimized medical strategy for supporting pregnant women through CAM therapy.
    Źródło:
    Management Systems in Production Engineering; 2022, 4 (30); 304--310
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operating characteristics of bearings with magnetic nanoparticles doped lubricant
    Autorzy:
    Krenicky, Tibor
    Mascenik, Jozef
    Coranic, Tomas
    Ruzbarsky, Juraj
    Powiązania:
    https://bibliotekanauki.pl/articles/27324376.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Techniki Górniczej KOMAG
    Tematy:
    lubricant
    magnetic nanoparticles
    bearing
    vibration
    lubrykant
    wibracje
    nanocząstki
    Opis:
    The main aim of the presented research was to investigate theoperational characteristics of a bearing when alternative lubricants were used for comparison with a standard lubricant, including that containing magnetic nanoparticles. The bearing was subjected to varying operating conditions, differing in terms of mechanical load status. The monitoring of the bearing operation parameters primarily focused on monitoring the velocity and acceleration of vibrations, as well as the operating temperature of the bearing. Thebearingwith lubricant doped by magnetic nanoparticles exhibited reduced vibration velocity and acceleration values both under no load conditions and when subjected to a mechanicalload. The operating temperature slightly increased during testing in the case ofthe bearing with nanoparticles compared to the bearing using the original lubricant.
    Źródło:
    Mining Machines; 2023, 41, 3; 168--174
    2719-3306
    Pojawia się w:
    Mining Machines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technical diagnostics of industrial double twist twinner machine for data cables
    Autorzy:
    Krenický, Tibor
    Ružbarský, Juraj
    Coranič, Tomáš
    Maščeník, Jozef
    Powiązania:
    https://bibliotekanauki.pl/articles/2175488.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    vibrodiagnostics
    maintenance
    twisted pair cables
    return loss
    cable fault
    wibrodiagnostyka
    konserwacja
    kable typu skrętka
    usterka kabla
    Opis:
    The presented article focuses on the diagnostic measurement and evaluation of vibrations of equipment used for data-cable twisted pairing manufacture. A short description of the process of the data cables manufacturing process to which the diagnosed device belongs is provided and the qualitative parameters of the data cables are mentioned. The experimental part is devoted to the experimental diagnostics of the given system in order to locate and identify the possible reason for the occurrence of the parameter´s critical value of the loss of the data cable. When deterioration of electric properties was detected, monitoring the basic oscillation characteristics has been deployed as the key tool to detecting damaged machine parts, and avoiding quality deterioration of the products in the manufacturing process. Finally, the quality of the paired cables after the repair has been confirmed by measurements verifying the efficiency of the measures performed.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 35--46
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of self-leveling table for FFF additive technology
    Autorzy:
    Coranič, Tomáš
    Ružbarský, Juraj
    Krenický, Tibor
    Maščeník, Jozef
    Powiązania:
    https://bibliotekanauki.pl/articles/27323744.pdf
    Data publikacji:
    2023
    Wydawca:
    STE GROUP
    Tematy:
    additive technologies
    calibration
    Arduino
    structural design
    technologie addytywne
    kalibrowanie
    projekt konstrukcyjny
    Opis:
    The presented paper describes the conceptual design of a worktable intended mainly for use in combination with FFF additive technologies, calibrated using a gyroscope and accelerometer. The proposed system is based on a programmable Arduino platform that operates with three digital servomotors and a mechanical gyroscope. In the introduction, the theoretical assumptions, and definitions of basic concepts such as a gyroscope, electric motor, and RC servomotor are described. Subsequently, the contribution is devoted to the selection of suitable components, the schematic connection, and the design itself in the Autodesk Inventor program. In the conclusion, the anticipated benefits of using the technical solution when applied in FFF additive technologies are described.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2023, 12, 2; 109--117
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of dynamic characteristics of screw conveyor
    Autorzy:
    Coranič, Tomáš
    Maščeník, Jozef
    Ružbarský, Juraj
    Krenický, Tibor
    Powiązania:
    https://bibliotekanauki.pl/articles/2175491.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    software
    modal analysis
    screw conveyor
    vibration
    oprogramowanie
    analiza modalna
    przenośnik ślimakowy
    wibracje
    Opis:
    A machine has always been, is and will be the technical progress. The basis of every economy is the progressiveness of manufacturing engineering since it manufactures components for all industries. Technical requirements in manufacturing engineering are constantly leading to an increase of the technical level of manufacturing equipment. Profound knowledge of scientific fields precedes a successful fulfilment of the technical requirements. Structural units of manufacturing machines are complex mechanisms that must work reliably and safely with an emphasis on their important function. These units create new objectives for their research and optimization.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 66--76
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties prediction of linear block-polyurethanes based on the mixtures of simple oligoethers
    Autorzy:
    Anisimov, Volodymyr Mykolaovych
    Anisimov, Volodymyr Volodymyrovych
    Krenicky, Tibor
    Powiązania:
    https://bibliotekanauki.pl/articles/409999.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    linear block-polyurethane
    oligoether
    physico-mechanical characteristics
    melt flow characteristics
    melt flow
    wear intensity
    material quality indicator
    Opis:
    Polyurethanes are materials usable in wide spectrum of applications. This article is aimed at the properties tailoring of selected polymers by an alteration in initial materials. To achieve that goal, we proposed form the polyurethane matrix by mixing materials that have a different ratio of the initial components. Mathematical model has been developed that describes relationship of structure and strength, deformation, rheological and tribotechnical characteristics of linear block-polyurethanes based on oligoether blends. Oligoethers blend samples were obtained by injection moulding on an automatic thermoplastication machine with varying proportions of the starting components over the whole concentration range. A significant change of properties over the whole concentration range was observed and compositions with unique combination of characteristics have been determined. Obtained dependencies allow to predict the composition of the binary mixture with a tailored level of strength, deformation, rheological and tribotechnical characteristics. The obtained results are fully consistent with the practical experience of processing and exploitation of initial polyurethanes.
    Źródło:
    Management Systems in Production Engineering; 2019, 4 (27); 217-220
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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