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Wyszukujesz frazę "transient effect" wg kryterium: Temat


Wyświetlanie 1-3 z 3
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
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:
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
    Wyświetlanie 1-3 z 3

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