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    Wyświetlanie 1-3 z 3
    Tytuł:
    Feeder type optimisation for the plain flow discharge process of an underground hopper by discrete element modelling
    Autorzy:
    Necas, J.
    Hlosta, J.
    Zurovec, D.
    Zidek, M.
    Rozbroj, J.
    Zegzulka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/101876.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    drag chain conveyor
    discrete element method
    simulation
    Opis:
    This paper describes optimisation of a conveyor from an underground hopper intended for a coal transfer station. The original solution was designed with a chain conveyor encountered operational problems that have limited its continuous operation. The Discrete Element Modeling (DEM) was chosen to optimise the transport. DEM simulations allow device design modifications directly in the 3D CAD model, and then the simulation makes it possible to evaluate whether the adjustment was successful. By simulating the initial state of coal extraction using a chain conveyor, trouble spots were identified that caused operational failures. The main problem has been the increased resistance during removal of material from the underground hopper. Revealed resistances against material movement were not considered in the original design at all. In the next step, structural modifications of problematic nodes were made. For example, the following changes have been made: reduction of storage space or installation of passive elements into the interior of the underground hopper. These modifications made were not effective enough, so the type of the conveyor was changed from a drag chain conveyor to a belt conveyor. The simulation of the material extraction using a belt conveyor showed a significant reduction in resistance parameters while maintaining the required transport performance.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 3; 246-252
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Validation of movement over a belt conveyor drum
    Autorzy:
    Rozbroj, J.
    Necas, J.
    Gelnar, D.
    Hlosta, J.
    Zegzulka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/101900.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Discrete Element Method
    belt conveyor
    Particle Image Velocimetry
    trajectory of particles
    Opis:
    This paper presents the use of new modern methods for the research of movement of material on a belt conveyor. One of the innovative methods is Particle Image Velocimetry (PIV), which was used to scan and assess the two-dimensional vector field of speed of particles on the belt conveyor. Outputs from PIV were compared to simulations of the same transport process. These simulations were performed using the Discrete Element Method (DEM). Four transport speeds of material were assessed for a real and simulative belt conveyor model. Software tracking of particle movement was used to determine and compare the trajectories of paths of particles leaving the belt conveyor drum. Validation of the DEM simulation of material movement over a belt conveyor drum using PIV provided acceptable results in the area of particle speed fields. Comparison of the particle path trajectory corresponds to the preliminary hypothesis which leads to calibration of the DEM simulation. The results and assessment of this paper were created based on validation.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 2; 118-124
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of material flow through a sample divider
    Autorzy:
    Rozbroj, Jiri
    Necas, Jan
    Zurovec, David
    Hlosta, Jakub
    Gelnar, Daniel
    Zegzulka, Jiri
    Powiązania:
    https://bibliotekanauki.pl/articles/102987.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    discrete element method
    sampling divider
    validation
    coal
    metoda elementów dyskretnych
    dzielnik do pobierania próbek
    węgiel
    Opis:
    The prerequisite for a modern approach to innovative procedures of the development of current or even newly created equipment for the transport of particulate materials is the utilization of simulation methods, such as the Discrete Element Method (DEM). This article focuses on the basic, or initial, validation of movement of material through the sample divider. The mechanical-physical properties of brown coal were measured. Based on these parameters the preliminary input values for EDEM Academic were selected, and a simulation of the dividing process was run. The key monitored parameters included density and friction coefficient. Experiments on a realistic model of the equipment were performed and assessed. The total weights of brown coal at the exit from the divider were determined for a specific speed of the divider. The aim of this task was to simulate the realistically determined weight division of the brown coal sample. The result from the DEM was compared with the results of measurement on a realistic model.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 1; 194-199
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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