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    Wyświetlanie 1-3 z 3
    Tytuł:
    The transition effect in rail tracks – assessment of transient energy for low frequency vibrations
    Autorzy:
    Sołkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/231030.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    strefa przejściowa
    efekt przejścia
    modelowanie
    tor kolejowy
    podtorze
    właściwości
    analiza stanów przejściowych
    metoda energii
    drgania niskiej częstotliwości
    transition zone
    transition effect
    modelling
    railtrack
    track foundation
    characteristics
    transient analysis
    energy approach
    low frequency vibration
    Opis:
    The transition effect between different track-foundation systems is examined from the point of view of energy that is produced during the passage of load. Analytical solution is given. A model of beam on elastic foundation with damping is used as the base model. It is developed into a model composed of two parts that represent the track-subgrade system with an abrupt change in mechanical parameters: bending stiffness, foundation stiffness, damping, and mass. Several calculations are carried out including examples of comparative calculations with the Finite Difference Model and the Finite Element Model. Transient rail deflections and energy are determined, which may serve to estimate the rate of track-subgrade deterioration.
    Źródło:
    Archives of Civil Engineering; 2014, 60, 1; 123-143
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient approach for iron loss separation of non-grain-oriented electrical steels considering the impact of cut edge effect
    Autorzy:
    Mülder, Christoph
    Elfgen, Silas
    Hameyer, Kay
    Powiązania:
    https://bibliotekanauki.pl/articles/140851.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cut edge effect
    hysteresis losses
    iron losses
    transient loss model
    Opis:
    The purpose of this paper is to focus on the loss separation of non-grain-oriented electrical steels used for speed-variable rotating electrical machines. The impact of laser-cutting, used in prototype manufacturing and of flux density harmonics, occurring locally in the lamination, on the loss distribution is studied in detail. Iron losses occurring under operation can physically be separated in different loss components. In this paper, a frequency-based loss model with parameters identified for single-sheet tester specimens, cut in strips of different widths, is therefore used. Moreover, a time-domain approach considers loss distributions occurring from higher harmonics. Hysteresis losses having high sensitivity to cut edge effects are calculated by the well-known Jiles-Atherton model adapting the frequency-based loss parameters. The model is validated by free-curve measurements at a single-sheet tester. It has been shown that the studied elliptical hysteresis model becomes inaccurate particularly for specimens with small strip widths with similar dimensions as teeth of electrical machine laminations. The incorrect mapping of losses occurring from minor hysteresis loops due to higher harmonics is concluded. The results showconsequently that both, the impact of a cut edge effect and local distributions of flux density harmonics need to be considered in terms of accurate iron loss prediction of electrical machine design.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 2; 237-244
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An assessment of the transient effect on helicopter main rotor stability and power demand
    Autorzy:
    Raczyński, Radosław
    Siadkowska, Ksenia
    Ścisłowski, Karol
    Wendeker, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2202519.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    propulsion
    rotor
    power demand
    helicopter
    transient effect
    napęd
    wirnik
    zapotrzebowanie na moc
    śmigłowiec
    efekt przejściowy
    Opis:
    The researched object is a helicopter main rotor with blades of variable geometric twist characteristics. Variable torsion refers to systems of actuators made of shape memory alloys. The presented numerical analyses allow for evaluating both the dynamics of the rotor in transient states, i.e. in the zone between the static phase and the full activation phase and the impact of the change on the pulsation of the amplitude of the necessary power generated by the rotor corresponding the flight state, and thus covering the demand by the disposable power generated by the engine. This study follows a methodology of numerical analyses based on Multi Body Dynamics and the Finite Element Method and uses fluid mechanics elements and algorithms to analyze lift generation, compiled in a single computational environment referring to the same period of time.
    Źródło:
    Combustion Engines; 2022, 61, 4; 23--28
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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