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    Wyświetlanie 1-4 z 4
    Tytuł:
    Modelling and simulation tests of a quadrocopter flying robot
    Autorzy:
    Ciesielka, Wojciech
    Grzegorz, Suchanek
    Powiązania:
    https://bibliotekanauki.pl/articles/2064410.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    quadrocopter
    mathematical model
    CFD simulation
    model matematyczny
    symulacja CFD
    Opis:
    In recent years, there has been a dynamic increase in the use of multirotor flying robots in various areas of economic and social life. Robots of this kind may be used in environmental research, after equipping them with an appropriate measuring systems. This includes taking measurements of various types of contaminants, such as: particulate matter (PM), various gases, noise and light pollution. To make this possible, it is necessary to conduct advanced model-simulation tests of the flying platform, analyse and determine the appropriate location for the measurement system. Most of the current research on methods and techniques of taking measurements on the flying platform does not take into account these issues. This work consists of two main parts: modeling and simulation tests, and experimental part carried out in laboratory conditions. As part of the work, quadrocopter dynamics equations have been developed and implemented in the Matlab/Simulink environment. The developed discrete mathematical model made it possible to simulate different robot maneuvers: upward, forward, sideways and rotation flight. In order to determine the required characteristics of the multicopter drive sets, a mobile dynamometer station was designed, constructed and programmed. The dynamometer allows, among others, to take measurements of thrust force, torque and rotational speed. The final stage of the work was the development of the numerical model and CFD calculations of the quadrocopter. In this part, distributions of the pressure fields and velocity for the robot's hover state were determined.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 486--495
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of particle separation in a centrifugal air separator
    Autorzy:
    Kaczyński, J.
    Kraft, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175534.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CFD simulation
    discrete particle model
    particle separation
    Opis:
    This paper presents the modeling approaches and results of numerical investigations into particle separation in a production-scale industrial centrifugal air separator. The gaseous phase was modeled using an Eulerian formulation, while the particle phase was modeled using a Lagrangian particle tracking approach. Two-way coupling between continuous and disperse phase was included and turbulence modeled using the realizable k-ε model. The resulting comprehensive system model provides correct predictions of the power consumption and of pressure losses in the device over the full operation range, and proved ability of accurately predicting the size-dependent particle separation efficiencies down to nominal particle sizes of 2 µm.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 57-71
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Problem of Airflow Around Building Clusters in Different Configurations
    Autorzy:
    Jędrzejewski, M.
    Poćwierz, M.
    Zielonko-Jung, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/139849.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environmental wind engineering
    airflow around buildings
    damage mechanics
    CFD simulation
    k-ε realizable model of turbulence
    RSM model of turbulence
    inżynieria wiatrowa
    przepływ powietrza wokół budynków
    mechanika uszkodzeń
    symulacja obliczeniowej dynamiki płynów CFD
    model turbulencji k-ε realizable
    model turbulencji RSM
    Opis:
    In the paper, the authors discuss the construction of a model of an exemplary urban layout. Numerical simulation has been performed by means of a commercial software Fluent using two different turbulence models: the popular k-ε realizable one, and the Reynolds Stress Model (RSM), which is still being developed. The former is a 2-equations model, while the latter – is a RSM model – that consists of 7 equations. The studies have shown that, in this specific case, a more complex model of turbulence is not necessary. The results obtained with this model are not more accurate than the ones obtained using the RKE model. The model, scale 1:400, was tested in a wind tunnel. The pressure measurement near buildings, oil visualization and scour technique were undertaken and described accordingly. Measurements gave the quantitative and qualitative information describing the nature of the flow. Finally, the data were compared with the results of the experiments performed. The pressure coefficients resulting from the experiment were compared with the coefficients obtained from the numerical simulation. At the same time velocity maps and streamlines obtained from the calculations were combined with the results of the oil visualisation and scour technique.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 3; 401-418
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of numerical and experimental studies of the airflow around the sample of urban development
    Autorzy:
    Gumowski, K.
    Olszewski, O.
    Poćwierz, M.
    Zielonko-Jung, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200297.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environmental wind engineering
    airflow around buildings
    CFD simulation
    k-ε realizable model of turbulence
    inżynieria wiatrowa
    środowisko
    przepływ powietrza wokół budynków
    symulacja CFD
    Opis:
    In this paper, on the background of a short overview of the recent advances in the field of Environmental Wind Engineering (EWE), a comparison of wind tunnel experiment and numerical simulation for some cases of airflow around an urban layout have been reported. The purpose of the study is quantitative and qualitative comparison of measurements in the wind tunnel as well as numerical simulation using Ansys Fluent software. The study is concerned mostly with the analysis of parameters which are essential in the building industry, such as pressure and velocity fields. In the numerical analysis the k-ε realizable model of turbulence with the basic model of boundary layer – Standard Wall Treatment, were used. Particular attention has been paid to accurate depiction of the conditions on the inlet and the selection of suitable computing.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 729-737
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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