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    Wyświetlanie 1-6 z 6
    Tytuł:
    Analysis of the forming process of conical-like helical surfaces with roller tools
    Autorzy:
    Kacalak, W.
    Budniak, Z.
    Szafraniec, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/265640.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    grinding
    CAD/CAE
    axial profile
    helical surface
    Matlab
    szlifowanie
    układ technologiczny
    Opis:
    The article presents a methodology of an analysis and modeling of technological systems and the grinding process of conical-like helical surfaces with the use of modern CAD/CAE systems and calculations in the Matlab system. The methodology developed allows one to carry out simulation tests for the accuracy of the grinding process of helical surfaces taking into consideration the deviations of the location and shape of the system’s elements, axial and radial striking the spindle of the workpiece machined and the grinding wheel as well as the tool’s geometrical features.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 101-110
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure Analysis of Thin-Walled Composite Profile Subjected to Axial Compression
    Autorzy:
    Różyło, Patryk
    Powiązania:
    https://bibliotekanauki.pl/articles/102779.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    progressive failure analysis
    finite element method
    composite profile
    progresywna analiza uszkodzeń
    metoda elementów skończonych
    profil kompozytowy
    Opis:
    The paper describes a numerical and experimental study investigating the load carrying capacity of thin-walled composite structure subjected to axial compression. Composite profile was made of carbon-epoxy laminate with symmetrical arrangement of the layers [90/-45/45/0]s. The experiment was performed on a universal testing machine (Zwick Z100) until total failure of the column. In case of experimental study, post-critical equilibrium paths in full range of loads of the structure were determined. The numerical analysis was performed by the finite element method using the Abaqus® software. Numerical analysis involved solving a nonlinear stability problem. The geometrically non-linear problem was solved by the Newton-Raphson method. The load carrying capacity of the composite structure was determined by the progressive failure analysis, which firstly estimates damage initiation load (Hashin criterion) and secondly estimates failure load (energy criterion). The numerical and experimental results show high agreement, which confirms the adequacy of the prepared numerical model of composite profile.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 3; 170-178
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the influence of magnetic induction ramp profile on axial force and friction torque generated by MR fluid
    Autorzy:
    Horak, Wojciech
    Szczęch, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/387573.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    MR fluid
    axial force
    torque
    control
    experiments
    magnetic field ramp
    Opis:
    The unique properties of magnetic fluids result from their ability to undergo reversible, almost immediate, changes in their rheological properties under the influence of magnetic fields as well as the possibility to position them by magnetic field forces. It is also possible to control the direction and flow rate of such fluids. These properties provide an efficient way to develop new types of controllable machines and devices, such as brakes, clutches and bearings. The objective of the study was to examine the axial force and torque friction of a magnetorheological (MR) fluid working in the shear flow mode (parallel plate system) subjected to different magnetic induction ramp profiles. The rotation speed and working gap height were also taken into account. Determining the response of the tested system to magnetic induction change in different working conditions was of particular interest.
    Źródło:
    Acta Mechanica et Automatica; 2019, 13, 3; 153-157
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rotors of vertical-axial wind turbines assembled in bearings and aerodynamic characteristics of a blade with unclosed wing profile
    Autorzy:
    Panda, Anton
    Rozhkova, Lyudmila
    Kuznetsov, Eduard
    Nahornyi, Volodymyr
    Powiązania:
    https://bibliotekanauki.pl/articles/27315541.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    wing profile
    wind turbine
    blade
    lifting force
    pulling force
    aerodynamic characteristics
    angle of attack
    Opis:
    In world practice, traditional blades used in high-speed wind turbines, both horizontal-axial and vertical-axial, have a wing-shaped profile. However, for horizontal-axial wind turbines, blades with such a profile have a fairly narrow range of operating values of the angle of attack of the incoming air flow and a low value of the moment of pulling from place. As for vertical-axial wind turbines, the self-starting of the rotor with wing blades is completely absent and additional devices are needed to start the rotor into operation. In order to ensure the selfstarting of the rotor and the operation of the wind turbine at high and low wind speeds, a new shape of the blade profile was developed, called non-closed wing profile. The concept of the development is that the blade should have a configuration in which the pulling force is involved at the beginning of the movement, and then, with the establishing of the movement, a lifting force would arise, which acquires a prevailing character in the operating mode. The article presents the results of experimental studies of the aerodynamic characteristics of the developed non-closed wing blades. One of the results obtained is to determine the effect of the thickness of the blade profile on the range of values of subcritical angles of attack of the incoming air flow and the differences between the nature and range of changes in the coefficients of lifting force and pulling force in a traditional wing blade and a blade with a non-closed wing profile. Studies of the rotor model of a vertical-axial wind turbine with non-closed wing blades have confirmed the presence of its self-starting and operability even at low wind speeds.
    Źródło:
    Management Systems in Production Engineering; 2022, 4 (30); 298--303
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD simulations for selection of appropriate blade profile for improving energy efficiency in axial flow mine ventilation fans
    Autorzy:
    Panigrahi, D. C.
    Mishra, D. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/91904.pdf
    Data publikacji:
    2014
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    mine ventilation
    axial flow fan
    energy efficiency
    lift
    CFD
    drag
    wentylacja kopalń
    wentylator osiowy
    efektywność energetyczna
    winda
    Opis:
    Purpose This study focuses on one of the key design aspects of mine ventilation fans, i.e. the selection of an appropriate aerofoil blade profile for the fan blades in order to enhance the energy efficiency of axial flow mine ventilation fans, using CFD simulations. Methods Computational simulations were performed on six selected typical aerofoil sections using CFD code ANSYS Fluent 6.3.26 at angles of attack varying from 0 to 21 at an interval of 3 and at Reynolds number Re = 3 × 106, and various aerody-namic parameters, viz. coefficients of lift (Cl) and drag (Cd) as a function of angle of attack (α) were determined to assess the efficiency of the aerofoils. Results The study revealed that the angle of attack has a significant effect on the lift and drag coefficients and stall condition oc-curred at α values of 12 and 15 in most of the aerofoils. Based on the criterion of higher lift to drag ratio (Cl/Cd), a blade profile was chosen as the most efficient one for mine ventilation fans. Practical implications This study forms a basis for selecting appropriate blade profiles for the axial flow fans used for ventilation in mining industry. Originality/ value The application of an appropriate aerofoil blade profile will impart energy efficiency to the mine ventilation fans and thereby result in energy saving in mine ventilation.
    Źródło:
    Journal of Sustainable Mining; 2014, 13, 1; 15-21
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Fiber Arrangement in the Bio-Laminate and Geometric Parameters on the Stability of Thin-Walled Angle Column Under Axial Compression
    Autorzy:
    Gawryluk, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2201861.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    bio-laminates
    flax
    buckling analysis
    L-profile
    numerical case
    Opis:
    The aim of this study is to check how the change fiber configuration and geometric parameters affect the stability of a thin-walled angle column under compression. Buckling analysis of thin-walled structures made of bio-laminates was presented. Short angles with different configurations of reinforcing fibers and geometric parameters were studied. The laminate under analysis had a matrix made of epoxy resin reinforced with unidirectional flax fibers. The axially compressed structures were simply supported on both ends. Detailed numerical analyses were conducted by the finite element method using Abaqus software. The lowest two bifurcation loads and their corresponding eigenmodes were determined. Several configurations of unidirectional fiber arrangement with different width and length were tested. Results showed that the bio-laminate fiber configuration had a significant effect on the behavior of the compressed structure. Moreover, the change of geometrical parameters significantly influences the stability of the structure. In general, it was found that the bifurcation load decreased with the increase of the length of the L-profile column. However, increasing the flange width of the column resulted in a reduction of the bifurcation load (applies to a column with a length of 300 mm and longer). In paper the first stage of research is presented, which will be experimentally verified in subsequent studies.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 1; 150--159
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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