Temat: step angle - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Stator pole arrangement of the permanent magnet stepper motor with asymmetric stator for achieving the uniform step
Autorzy:: Ferková, Ž.
Bober, P.
Powiązania:: https://bibliotekanauki.pl/articles/1367723.pdf
Data publikacji:: 2015
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:: stepper motor construction
asymmetric stator
magnetic circuit simulation
finite element method
step angle
Opis:: A special type of a two-phase permanent magnet stepper motor with asymmetric stator was constructed for the specific purpose. The structural design was based on a modified geometry of standard stator and a functional motor prototype was built. The measurement of the step uniformity reveals irregular step size for half-stepping driver. This paper presents the approach to find proper stator pole dimensions to achieve uniform step in half-stepping regime of permanent magnet stepper motor. The simulation of a magnetic circuit was used. The measurement on the prototype and the simulation of the motor angle for different stator arrangement are presented.
Źródło:: Maszyny Elektryczne: zeszyty problemowe; 2015, 3, 107; 173-177
0239-3646
2084-5618
Pojawia się w:: Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical study of step forward swept angle effects on the hydrodynamic performance of a planing hull
Autorzy:: Nourghasemi, H.
Bakhtiari, M.
Ghassemi, H.
Powiązania:: https://bibliotekanauki.pl/articles/135251.pdf
Data publikacji:: 2017
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: planing hull
step forward swept angle
hydrodynamic performance
drag
wake profile
RANS
Opis:: One of the most effective methods to diminish the drag of a planing craft is to use a step at the bottom of the hull. A stepped hull causes a reduction of the wetted area and, as a result, a decrease in the drag. The step may be designed as a straight line through the entire width of the hull or may be V-shaped with a forward or backward swept angle. In this paper, the effects of the step forward swept angle on the hydrodynamic performance of a hard chine planing vessel are investigated by finite volume method (FVM). Reynolds-Averaged Navier Stokes (RANS) equations with a standard k-ε turbulence model coupled with volume of fluid (VOF) equations are solved in order to simulate a transient turbulent free surface flow around the hull with the help of Ansys CFX software. In order to predict hull motions, equations of rigid body motions for two degrees of freedom (2-DOF) are coupled with fluid flow governing equations. To validate the presented numerical model, first the numerical results are compared with available experimental data, and then the obtained numerical results of the drag, dynamic trim, sinkage, wetted keel length, wetted chine length, pressure distribution on the hull, wetted surface and wake profile at different Froude numbers and step angles are presented and discussed.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 51 (123); 35-42
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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