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1
Content available Vibrations of the technological head of the abrasive water jet during cutting of structural stee
Krenicky Tibor, Mascenik Jozef, Ruzbarsky Juraj, Coranic Tomas, Olejarova Stefania
Mining Machines
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2024
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vol. 42, iss. 3
174--181
EN
Vibration measurement is a fundamental aspect of ensuring the optimal and reliable operation of machinery, with implications for production quality, economic efficiency, and safety. The monitoring of machine condition provides essential data for the early detection of damage to machine parts, thereby preventing unanticipated failure modes and disruptions in production. Accordingly, this paper focuses on the measurement and assessment of fundamental vibration parameters, with a particular emphasis on frequency and vibration acceleration amplitude that allows to optimize the production quality assessment. Experimental measurements were conducted on a technological head of production system using abrasive water jet technology (AWJ) with a varied feed rate while cutting two types of structural steel. Based on the results of these measurements, recommendations were formulated regarding suitable and inappropriate combinations of operating parameters, thereby enhancing current knowledge regarding the influence of technological parameters on the amplitudes of vibration acceleration in the operation of production systems with AWJ technology.
2
Content available Monitoring of selected parameters of the belt transmission on a specific design solution
Mascenik Jozef, Krenicky Tibor, Ruzbarsky Juraj, Coranic Tomas
Mining Machines
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2024
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vol. 42, iss. 4
240--248
EN
Belt drives have been used for decades to transmit power from a drive unit to an end device in a variety of applications. There is constant scientific, technical and technological progress in the production and use of belts, which has led to a variety of types and types of belts. Belt drives have several advantages over other methods of power transmission, including light weight, affordability, and the ability to be used as a slip clutch. As the requirements for V-belts increase, so does the required quality of the offered belts. When analyzing belt transmissions, it is also possible to examine their influence on other components of the machine or equipment on which they are installed. If the belt drive transmits large forces, this can have consequences on the bearings and other parts of the transmission. It is therefore essential to ensure that belt drives are optimally designed and installed to minimize potential damage to other components. On the designed specific design solution for testing belt transmissions, the actual revolutions of the input and output pulleys were monitored, the belt float was measured using high-precision distance measurement sensors, and the vibrations were measured using a magnetically fixed sensor. During the experimental measurements, parameters such as belt tension, input speed and output load were changed. The experimental measurements themselves were carried out on three A1450Lw 13x1420Li belts of the same dimensions, but manufactured by other manufacturers (Optibelt, Rubena and Gufero).
3
Content available Operating characteristics of bearings with magnetic nanoparticles doped lubricant
Krenicky Tibor, Mascenik Jozef, Coranic Tomas, Ruzbarsky Juraj
Mining Machines
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2023
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vol. 41, iss. 3
168--174
EN
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.
4
Content available Monitoring of belt floating under controlled belt transmission load
Mascenik Jozef, Coranic Tomas, Ruzbarsky Juraj, Krenicky Tibor
Mining Machines
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2023
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vol. 41, iss. 2
107--118
EN
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.
5
Content available Use of the MBS method in mining industry R&D projects
Szewerda Kamil, Krenicky Tibor
Mining Machines
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2022
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vol. 40, iss. 2
110--120
EN
Virtual prototyping methods are an important aspect both in the designing process and in research processes aimed at the modification and optimization of machines and devices. It allows one to analyse the way of operation, the flow of forces, the cooperation between components, as well as finding the weakest points of the structure. This article presents the possibilities of using the MBS method, which is one of the tools used in virtual prototyping, on the basis of the results of R&D projects realized at the KOMAG Institute of Mining Technology. The main objective of the MBS method is to simulate the kinematics and dynamics of multi-body systems, the results of which will enable a series of analyses related to the operation of machines and devices.
6
Content available Tests of selected elements of building components in the light of compulsory requirements
Szweda Stanisław, Wojtaszczyk Marek, Krenicky Tibor
Mining Machines
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2022
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vol. 40, iss. 3
130--140
EN
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.
7
Content available Application of concepts of the analytic hierarchy process in decision-making
Krenicky Tibor, Hrebenyk Liudmyla, Chernobrovchenko Vadym
Management Systems in Production Engineering
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2022
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nr 4 (30)
304--310
EN
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.
8
Content available Blades interaction and non-stationarity of flow in vertical-axial wind turbines
Rozhkova Ludmila, Krenicky Tibor, Kuznetsov Eduard, Nahornyi Volodymyr
Management Systems in Production Engineering
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2021
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nr 4 (29)
280--286
EN
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).
9
Content available Properties prediction of linear block-polyurethanes based on the mixtures of simple oligoethers
Anisimov Volodymyr Mykolaovych, Anisimov Volodymyr Volodymyrovych, Krenicky Tibor
Management Systems in Production Engineering
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2019
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nr 4 (27)
217--220
EN
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.
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