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    Wyświetlanie 1-6 z 6
    Tytuł:
    Selection of the optimal paper-forming sieve obtained by the plasma welding
    Autorzy:
    Bojić, Nada
    Nikolić, Ružica
    Hadzima, Branislav
    Powiązania:
    https://bibliotekanauki.pl/articles/104146.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    paper-forming
    plasma welding
    tensile strength
    elongation
    steel sieve
    papiernictwo
    spawanie plazmowe
    wytrzymałość na rozciąganie
    wydłużenie
    sito stalowe
    Opis:
    The paper-forming sieve is the most important part of the paper production machine. Reliability of the machine as a whole depends on the sieve's quality. An analysis of the two constructions of the paper forming sieves, which were obtained by the plasma welding of the sieve's wires, is presented in this paper. The mechanical characteristics of the two sieves, made of wires of diameters 0.15 mm and 0.20 mm, were tested, namely the tensile strength and elongation. The tests have shown that the sieve made of the wire of the smaller diameter has the better mechanical properties. This sieve is also better from the aspect of the water removal in the press section of the paper machine.
    Źródło:
    Quality Production Improvement - QPI; 2020, 2, 1; 221-228
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the welding joint type on safety properties of the armor steel ARMOX 500t
    Autorzy:
    Lazić, Vukić
    Arsić, Dušan
    Nikolić, Ružica
    Uhričik, Milan
    Hadzima, Branislav
    Powiązania:
    https://bibliotekanauki.pl/articles/88599.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Armox 500T
    safety properties
    ballistic properties
    welding
    heat affected zone
    właściwości bezpieczeństwa
    właściwości balistyczne
    spawalnictwo
    strefy wpływu ciepła
    Opis:
    Steels of the ARMOX class belong into a group of the fine-grained, increased strength steels, which are manufactured by the quenching and low tempering procedure, with intensive thermo-mechanical treatment at high temperatures. Combination of the heat and mechanical treatments provides for the fine grains and exceptionally good properties of these steels, while the low-tempering enables relatively high hardness and good ballistic properties. This is why the welding of these steels can negatively affect the material properties in individual zones of the welded joint, what could lead to worsening of the material's ballistic properties, as well. The model plates were welded with the specially prescribed technology; the joints were the but-joint, corner joint and the joint with the shielding plate. In this paper are presented results obtained from the ballistic tests of the plates welded by the prescribed technology; tests consisted of shooting with three types of live ammunition at different types of the welded joints.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 753-759
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal fracture characteristics of an interface crack subjected to temperature variations
    Autorzy:
    Kalinović, Saša M.
    Djoković, Jelena M.
    Nikolić, Ružica R.
    Hadzima, Branislav
    Powiązania:
    https://bibliotekanauki.pl/articles/1839517.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    interface crack
    two-layered sample
    temperature variation
    fracture properties
    LEFM concept
    pęknięcia
    próba dwuwarstwowa
    wahania temperatury
    właściwości pękania
    koncepcja LEFM
    Opis:
    Thermal fracture characteristics - the thermal energy release rate and thermal stress intensity factor of a semi-infinite crack at an interface between the two elastic isotropic materials, subjected to the temperature variations, are considered in this paper. Those characteristics are determined based on application of the linear elastic fracture mechanics (LEFM) concept. Expressions for obtained theoretical solutions are compared to solutions from literature and they are found to be more concise. Influence of the materials change on these two thermal fracture properties were observed, as well as the influence of the thickness ratio of the two layers constituting the interface.
    Źródło:
    Production Engineering Archives; 2020, 26, 2; 54-59
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of the thermal dynamic performance of the residential buildings walls
    Autorzy:
    Kalinović, Saša M.
    Djoković, Jelena M.
    Nikolić, Ružica R.
    Hadzima, Branislav
    Powiązania:
    https://bibliotekanauki.pl/articles/104140.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    wall's specific mass
    heat conduction coefficient
    periodical heat transfer
    reduction factor
    thermal inertia
    ściany
    współczynnik przewodzenia ciepła
    okresowe przekazywanie ciepła
    współczynnik redukcji
    bezwładność cieplna
    Opis:
    Calculation of the thermal dynamic properties of the multi-layer wall isolation of residential buildings is presented in this paper. Taking into account that the final objective is to create a building with the highest energy efficiency ratio, i.e. with the lowest energy consumption, both for heating and cooling, it is necessary to realize the good thermal characteristics of the multi-layer wall. To obtain the optimal solution for the wall's structure, various wall structures with different thicknesses of the individual layers, were analyzed. Based on results, presented in this paper, one can conclude that for walls with the same total thickness, but various thicknesses of the individual layers, that constitute the complete wall structure, the differences appear in the delay of the change of the walls outside temperature. In that way, by varying those individual layers' thicknesses, one can obtain the optimal solution for the wall structure with the highest savings of energy.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 212-221
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of the work-related injuries based on neural networks
    Autorzy:
    Ivaz, Jelena
    Nikolić, Ružica R.
    Petrović, Dejan
    Djoković, Jelena M.
    Hadzima, Branislav
    Powiązania:
    https://bibliotekanauki.pl/articles/1831305.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    mining industry
    safety
    work-related injuries
    artificial neural networks
    przemysł górniczy
    bezpieczeństwo
    wypadek przy pracy
    sztuczne sieci neuronowe
    Opis:
    Artificial neural networks (ANN) are a powerful tool in the decision-making process, especially in solving the complex problems with a large number of input data. The possibility to predict the work-related injuries in the underground coal mines, based on application of the neural networks, is analyzed in this work. the input data for the network were obtained based on a survey of 1300 respondents. After analyzing the input data influence on the network output, 14 most influential inputs were selected, with help of which the network correctly predicted whether the worker would suffer the work-related injury or not, with 80% precision. The two models were developed, based on the multilayer perceptron (MLP) and radial basis function (RBF) networks. The two models' results were compared to each other. The sensitivity analysis was used to select the most influential parameters, like mine, age of miners, as well as their work experience. The parameters were further analyzed by use of the descriptive statistics. The selected parameters are direct indicators of problems that can cause injuries. The obtained results point to the fact that the work-related injuries can be successfully predicted by application of the artificial neural networks. The proposed models' importance is reflected in the clear indicators for enforcing the stricter occupational safety and organizational measures in order to reduce the number of work-related injuries in underground mines.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2021, 3, 1; 19-37
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of different hard-facing procedures on quality of surfaces of regenerated gears
    Autorzy:
    Nikolić, Ružica R.
    Marković, Svetislav
    Arsić, Dušan
    Lazić, Vukić
    Hadzima, Branislav
    Ulewicz, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/23968097.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    regeneracja
    napawanie
    koło zębate
    właściwości tribiologiczne
    współczynnik tarcia
    regeneration
    hard-facing
    gear
    tribological properties
    friction coefficient
    Opis:
    During the process of regeneration of machine parts, certain phenomena occur that have a significant impact on the loss of their working ability. Hereditary properties are expressed by the interdependence of geometric and physical-mechanical-metallurgical parameters of gear teeth created during the technological operations of regeneration of worn teeth by hard-facing. The influence of the type of additional material (electrodes and their combinations) on the tribological characteristics of welded gear teeth was considered, whereby the so-called hard additional materials were applied. Those are the additional materials that give the required surface hardness of the teeth without subsequent thermal or thermochemical treatment. This research did not involve the regeneration of specific worn gears removed from machine systems, but the new gears were made, which were then damaged and then regenerated by hard-facing using the shielded metal arc welding (SMAW) procedure. Thus, all the tested gears were made of the same material, belonged to one batch and were machined on the same machines with the same machining regimes. The tests were performed on samples made of 20MnCr5 steel for cementation, on a tribometer by the “block on disc” method, which was designed to simulate the operating conditions of coupled teeth of concrete gears in the exploitation conditions. Based on the conducted tribological tests, the average coefficients of friction and topography of the surfaces were determined by measuring the wear trace and it was defined which additional materials give the best tribological characteristics of the surfaces of gears regenerated by hard-facing.
    Źródło:
    Production Engineering Archives; 2021, 27, 4; 257--264
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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