Temat: Zero-Flux - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Magneto convection in a layer of nanofluid with soret effect
Autorzy:: Chand, R.
Rana, G. C.
Powiązania:: https://bibliotekanauki.pl/articles/387119.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: nanofluid
Zero-Flux
Soret Effect
Nanofluid Lewis Number
Chandrasekhar Number
Galerkin methods
magnetic field
pole magnatyczne
metoda Galerkina
efekt Soreta
liczba Lewisa
liczba Chandrasekhara
nanopłyny
nanociecze
Opis:: Double diffusive convection in a horizontal layer of nanofluid in the presence of uniform vertical magnetic field with Soret effect is investigated for more realistic boundary conditions. The flux of volume fraction of nanoparticles is taken to be zero on the isothermal boundaries. The normal mode method is used to find linear stability analysis for the fluid layer. Oscillatory convection is ruled out because of the absence of the two opposing buoyancy forces. Graphs have been plotted to find the effects of various parameters on the stationary convection and it is found that magnetic field, solutal Rayleigh number and nanofluid Lewis number stabilizes fluid layer, while Soret effect, Lewis number, modified diffusivity ratio and nanoparticle Rayleigh number destabilize the fluid layer.
Źródło:: Acta Mechanica et Automatica; 2015, 9, 2; 63-69
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Feedback linearization of an active magnetic bearing system operated with a zero-bias flux
Autorzy:: Mystkowski, A.
Kaparin, V.
Kotta, Ü.
Pawluszewicz, E.
Tõnso, M.
Powiązania:: https://bibliotekanauki.pl/articles/331088.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: active magnetic bearing
flux control
zero bias
feedback linearization
flat outputs
łożysko magnetyczne aktywne
regulacja strumienia
linearyzacja sprzężenia zwrotnego
Opis:: Input-output linearization by state feedback is applied to a flux-controlled active magnetic bearing (AMB) system, operated in the zero-bias mode. Two models of the AMB system are employed. The first one is described by the third-order dynamics with a flux-dependent voltage switching scheme, whereas the second one is the fourth-order system, called self-sensing AMB, since it does not require the measurement of the rotor position. In the case of that system we had to find the flat outputs to guarantee its stability. The proposed control schemes are verified by means of numerical simulations performed within the Matlab environment.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2017, 27, 3; 539-548
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Comparative study between propulsion control system failures of an electrical vehicle piloted by FOC and by DTC using dual-induction-motors structure
Autorzy:: Yahia Cherif, Salah
Benoudjit, Djamel
Nait-Said, Mohamed Said
Nait-Said, Nasreddine
Powiązania:: https://bibliotekanauki.pl/articles/327784.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: electrical vehicle
EV
propulsion control system
PCS
flux oriented control
FOC
direct torque control
DTC
speed sensor offset
zero-feedback faults
pojazd elektryczny
napęd
układ sterowania
awaria
Opis:: This paper deals with a comparative study using numerical simulations between the failures effect caused by the speed sensor faults for a propulsion control system (PCS) of an electrical vehicle (EV) using dualinduction motors structure. The PCS strategies are achieved on two types of controls where the first one is done from a flux-oriented control (FOC) and the second one is conducted from a direct torque control (DTC). For an electric vehicle, we will often guarantee service continuity, in spite of the occurred faults such as an offset fault in speed sensor and a zero-feedback sensor speed fault which both are essentially needed in the structure of the PCS-EV. The occurred fault cited above might influence one of the dual induction motors which could be conducted an unbalance in the dual used motors and from which the control of the vehicle might be also lost. The results of the realized numerical simulations on the EV conducted by the PCS demonstrate clearly the impact of the so-called-fault. Thereafter, we can also appreciate the robustness using each used control propulsion system in despite of the occurred speed sensor fault.
Źródło:: Diagnostyka; 2020, 21, 3; 41-47
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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