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Tytuł:
2019Gyroplane rotor hubs strength tests
Autorzy:
Wojtas, Małgorzata
Sobieszek, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/242059.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
gyroplane
strength tests
rotor hub
aviation regulations
Opis:
In this article a review of rotor,hub constructions were presented. Discussed rotor’s hub ismade of composite or aluminum alloys materials. Two types of rotor hub were presented (four-blades and two-blades teetering rotor hub), each of them are dedicated to gyroplanes. Typical gyroplane main rotors are characterized by simple design, especially in case of rotors forlight gyroplanes. In the following part of the article thetype of strength tests required by certification process were shown. The test programs based on legal aspects of admission to the flight tests taking into account legislation such as CS 27 (Subpart C – Strength Requirements), CAP 643 British Civil Airworthiness requirements Section T Light gyroplanes, ASTM F2972. Furthermore, this articlediscusses strength tests of gyroplane rotor hub such as measured parameters, methodology of measurement, types of sensors, course of test, test stands, and limit loads. The loads during “pull-up from level flight” manoeuvreare limit loads during tests. Required additional processes, like averification the same parameters by two types of method were shown i.e.deformation of structure were tested by strain gauges and reverse engineering.Strength tests had to be made before flight test, based on results of them aircrafts are flight authorized. In conclusion,the results of tests were presented and fulfilment of legal assumptions and requirements were shown.
Źródło:
Journal of KONES; 2019, 26, 3; 265-270
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D numerical analysis of an H-Darrieus hydrokinetic turbine with passive improvement mechanisms
Autorzy:
Guevara-Munoz, Angie Judith
Hincapie-Zuluaga, Diego Andres
Rodriguez-Cabal, Miguel Angel
Sierra-Del-Rio, Jorge Andres
Colmenares-Quintero, Ramón Fernando
Torres-Lopez, Edwar
Powiązania:
https://bibliotekanauki.pl/articles/38911523.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
renewable energy
H-Darrieus rotor
hydrokinetics
diffusers
computational fluid dynamic
CFD
external accessories
Opis:
H-Darrieus hydrokinetic turbines are an alternative for small hydroelectric plants. These turbines are considered to have a low environmental impact as they do not require reservoirs. However, they have limited self-starting capacity, which limits their use. Nevertheless, the configuration of passive mechanisms in the H-Darrieus turbines affects their performance, as they tend to increase the flow velocity. This study is part of a project with the aim to design and build a turbine to generate energy in the Colombian river scenario in non-interconnected zones. The objective of this study is to analyze the performance through numerical simulations of four H-Darrieus rotors to be configured with passive improvement mechanisms. The study was conducted using ANSYS® Fluent software, employing transient, two-dimensional models under constant operating conditions. Overlapping meshes were used for the stationary and rotating domain configuration. The results show that increased solidity leads to decreased tip speed ranges and increased maximum rotor power. Improvement in the self-starting capability was found with passive mechanisms employing a diffuser geometry. Among the tested configurations, the rotor configured with a Venturi-shaped mechanism achieved a remarkable 660% improvement in the power coefficient compared to configurations without such mechanisms.
Źródło:
Engineering Transactions; 2023, 71, 4; 553-569
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D inviscid flutter of rotor blades and stator/rotor stage
Autorzy:
Rządkowski, R.
Gnesin, V.
Powiązania:
https://bibliotekanauki.pl/articles/1967639.pdf
Data publikacji:
2001
Wydawca:
Politechnika Gdańska
Tematy:
3D inviscid flutter
flutter
blades
stator/rotor stage
rotor blades
unsteady forces
3D finite element model
Opis:
The approach is based on solution of the coupled aerodynamic-structure problem for 3D flow through the turbine stage in which fluid and dynamic equations are integrated simultaneously in time. An ideal gas flow through the mutually moving stator and rotor blades with periodicity on the whole annulus is described by unsteady Euler conservation equations, which are integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and moving hybrid H-H grid. The structure analysis uses the modal approach and 3D finite element model of a blade. A calculation was performed for the last stage of the steam turbine with rotor blades of 0.765 m.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 567-577
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study based on proportional integral and backstepping controllers for doubly fed induction generator used in wind energy conversion system
Autorzy:
Moumani, Youssef
Laafou, Abdeslam Jabal
Madi, Abdessalam Ait
Powiązania:
https://bibliotekanauki.pl/articles/2202553.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
backstepping control
control
Doubly FedInduction
Grid Side Converter
MPPT
Maximum Power Point Tracking
PI
Rotor Side Converter
wind turbine
Opis:
This paper presents a comparative study between the conventional PI (Proportional Integral) and backstepping controllers applied to the DFIG (Doubly Fed Induction Generator) used in WECS (Wind Energy Conversion System). These two different control strategies proposed in this work are developed to control the active and reactive power of the DFIG on the one hand, and to maintain the DC-link voltage constant for the inverting function on the other hand. This is ensured by generating control signals for two power electronic converters, RSC (Rotor Side Converter) and GSC (Grid Side Converter). In order to optimise the power production in the WT (Wind Turbine), an MPPT (Maximum Power Point Tracking) algorithm is applied along with each control technique. To simulate the effectiveness of the proposed controllers, MATLAB/Simulink Software is used, and the obtained results are analysed and discussed to compare PI and backstepping controllers in terms of robustness against wind speed variations and tracking performance in dynamic and steady states.
Źródło:
Archives of Electrical Engineering; 2023, 72, 1; 211--228
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of helicopter main rotor features due to stiffness of rotor blade-hub connection
Porównanie własności wirnika nośnego śmigłowca przy różnej sztywności połączenia łopaty z głowicą wirnika
Autorzy:
Stanisławski, J.
Powiązania:
https://bibliotekanauki.pl/articles/213599.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
helicopter
main rotor
blade deformations
śmigłowiec
wirnik nośny
odkształcenia łopat
Opis:
The paper presents results of simulation calculations concerning an influence of stiffness of blade-hub connection on rotor loads and blades deflections in hover, level flight and pull up maneuver. The three versions of rotor are considered with articulated, elastic and stiff connections of blades and hub. The blades with the same distributions of stiffness, mass and the same aerodynamic characteristics are applied for all rotor cases. The rotor loads are calculated applying Runge-Kutta method to solve the equations of motion of deformable blades. According to the Galerkin method, the parameters of blades motion are treated as combination of considered blade bending and torsion eigen modes. The results of calculations indicate for possibility to generate the greater rotor control moments and to improve helicopter maneuverability in the case of applying the non-changed blade of articulated rotor combined with elastic rotor hub.
W pracy przedstawiono wyniki obliczeń symulacyjnych dotyczących wpływu sztywności połączenia łopat z głowicą na poziom obciążeń wirnika i odkształceń łopat w warunkach zawisu, lotu poziomego i wyrwania. Przyjęto trzy wersje wirnika nośnego z przegubowym, sprężystym i sztywnym połączeniem łopat i głowicy. Dla wszystkich przypadków wirnika przyjęto łopaty identycznym rozkładzie sztywności, mas i charakterystyk aerodynamicznych. Obciążenia wirnika nośnego wyznaczano rozwiązując metodą Runge-Kutta równania ruchu odkształcalnych łopat z uwzględnieniem metody Galerkina, gdzie parametry ruchu łopat traktowano jako złożenie giętnych i skrętnych postaci własnych łopat. Wyniki symulacyjne wskazują na możliwość generacji większych momentów sterujących wirnika i poprawę manewrowości śmigłowca w przypadku zabudowy niezmienianej łopaty wirnika przegubowego w zespole z głowicą sprężystą.
Źródło:
Prace Instytutu Lotnictwa; 2018, 1 (250); 114-131
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A control system based on the DC-DC converter for stand-alone vertical-axis wind turbines
Układ sterowania działający w oparciu o przekształtnik DC-DC dla autonomicznych elektrowni wiatrowych z osią pionową
Autorzy:
Shchur, I. Z.
Turlenko, O. R.
Powiązania:
https://bibliotekanauki.pl/articles/194118.pdf
Data publikacji:
2010
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
turbina wiatrowa
pionowa oś
wirnik turbiny wiatrowej
PMSG
DC-DC przekształtnik
sterowanie optymalne
wind turbine
vertical axis
wind turbine rotor
DC-DC converter
optimal control
Opis:
In this paper the investigation of uncontrollable and adjustable by the boost DC-DC converter systems of autonomous wind turbines are conducted on the basis of computer simulation. To achieve the maximum efficiency of energy transference and conversion at different wind speeds, the optimal combination of regulated and unregulated modes is proposed. The developed control system allows taking off the maximum power from wind without a wind sensor.
W niniejszej pracy są przedstawione wyniki badań układu sterowania autonomicznej elektrowni wiatrowej z osią pionową, który wykorzystuje przekształtnik DC-DC. Badania przeprowadzono za pomocą symulacji komputerowej. Aby osiągnąć maksymalną skuteczność przesyłania i konwersji energii przy różnych prędkościach wiatru zaproponowano optymalną kombinację regulowanych i nieregulowanych trybów pracy. Opracowane sterowanie umożliwia maksymalne wykorzystanie mocy wiatru bez stosowania czujnika prędkości wiatru.
Źródło:
Zeszyty Naukowe. Elektrotechnika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy; 2010, 15; 53-65
0209-0570
Pojawia się w:
Zeszyty Naukowe. Elektrotechnika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Approach to Modelling and Testing the Fatigue Strength of Helicopter Rotor Blades during Repair Process
Autorzy:
Sałaciński, Michał
Kowalski, Rafał
Szmidt, Michał
Augustyn, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/98006.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
rotor blade
helicopter
fatigue test
repairs
bonding
composites
Opis:
The fatigue test was carried out on an element of a rotor blade removed from the Mi-2 helicopter. The purpose of the test was to check the fatigue strength of the repaired rotor blade. Metal composite rotor blades have a metal spar in the form of a box and the trailing sections in the form of metallic honeycomb sandwich panels. The trailing sections are bonded to the spar. The repair had been carried out at the point where the trailing section became debonded from the spar at the Air Force Institute of Technology in Warsaw using a methodology developed for carrying out repairs of rotor blades’ damage. All types of the Mi family helicopters are equipped with metal composite rotors blades. Depending on MTOW (Maximum Take-Off Weight) and destination of helicopters, blades differ in dimensions, but their design solutions are practically the same. For this reason, the developed repair methodology can be used for all characteristic rotor blades structures for Mi helicopters. The fatigue test was performed at the Łukasiewicz - Institute of Aviation in Warsaw, using a hydraulically driven fatigue machine. The fatigue test was carried out by performing over 1.1 million load cycles. In repair places, upon completion of fatigue testing, no damage was found.
Źródło:
Fatigue of Aircraft Structures; 2019, 11; 56-67
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new improved control for power quality enhancement in double fed induction generator using iterative learning control
Autorzy:
Djaidja, Oussama
Mekki, Hemza
Zeghlache, Samir
Djerioui, Ali
Powiązania:
https://bibliotekanauki.pl/articles/5882904.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
doubly fed induction generator
vector control
fault tolerant control
iterative learning control
broken rotor bars
generator indukcyjny
sterowanie wektorowe
sterowanie odporne na uszkodzenia
sterowanie z uczeniem iteracyjnym
pęknięte pręty wirnika
Opis:
This work presents a new Fault Tolerant Control approach for a doubly fed induction generator using Iterative Learning Control when the fault occurs. The goal of this research is to apply the proposed ILC controller in conjunction with vector control for doubly fed induction generator to enhance its reliability and availability under broken rotor bars. However, the performances of classical VC control are often characterized by their inability to deal with the effects of faults. To overcome these drawbacks, a combination of VC control and iterative learning control is described. The input control signal of the VC controller is gradually regulated by the ILC harmonic compensator in order to eliminate the faults effect. The improvement of this approach related to active and reactive power ripples overshoot and response time have been explained. Which active and reactive power response time have been reduced more than 84% and 87.5 % respectively. The active and reactive power overshoots have been reduced about 45% and 35% respectively. The obtained results emphasize the efficiency and the ability of the proposed FTC to enhance the power quality in faulty condition.
Źródło:
Diagnostyka; 2023, 24, 3; art. no. 2023309
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel rotor design for a hybrid excited synchronous machine
Autorzy:
Paplicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/141651.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
experimental result
field-weakening
finite element analysis
hybrid excitation
PM machine
rotor design
Opis:
The paper presents three novel rotor design concepts for a three-phase electric controlled permanent magnet synchronous machine (ECPMS-machine) with hybrid excitation. The influence of magnets and flux-barriers arrangement on the magnetic field distribution and field-weakening characteristics of the machine is examined, based on a three-dimensional finite element analysis (3D-FEA). Moreover, a prototype rotor design based on a new rotor concept with a good field-weakening capability is presented in detail. Finally, the experimental results of no-load back electromotive force (back-EMF) waveforms and field-weakening characteristics versus a control coil current of the machine are reported.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 29-40
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A semi-active control of lateral vibrations of the overhung rotor using dampers with the magneto-rheological fluid
Autorzy:
Michajłow, M.
Konowrocki, R.
Szolc, T.
Powiązania:
https://bibliotekanauki.pl/articles/127741.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
overhung rotor-shaft
lateral vibrations
semi-active control
optimal control theory
wał wirnika
drgania poprzeczne
sterowanie półaktywne
teoria sterowania optymalnego
Opis:
In the paper there is proposed an algorithm of an efficient semi-active control of steady-state periodic lateral vibrations of the overhung rotor-shaft system. This algorithm has been developed using fundamentals of the Optimal Control Theory. In the considered system the control is realized by means of the linear dampers with the magneto-rheological fluid built in the bearing housing. The computational example demonstrates possibilities of the applied approach resulting in an additional reduction of out-of-resonance and near-resonance harmonic oscillation amplitudes in comparison with an analogous passive control.
Źródło:
Vibrations in Physical Systems; 2016, 27; 273-280
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A set of wheel water turbine with the current steering - a mathematical torqu model
Zestaw turbiny wodnej z kierownicą nurtu - model matematyczny momentu napędowego
Autorzy:
Starzomska, M.
Powiązania:
https://bibliotekanauki.pl/articles/402084.pdf
Data publikacji:
2012
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
water turbine
rotor of vertical axis of rotation
torque
turbina wodna
wirnik z pionową osią obrotu
moment obrotowy
Opis:
This paper presents the idea of the wheel water turbine with an innovative current steering, due to its structure, operation principle and innovative way to use the energy offlowing water This device meets the prevailing trends in the energy and water authorities issuing environmental decisions and preferred low-speed and law-falling turbine to minimize the impact on the ecosystem. The use of the described solution allows for the effective gain of the energy from watercourses that are economically unviable or impossible for technical reasons of the use of conventional turbines. The described device is the water turbine with a vertical axis rotor and planetary motion blades. They were also the power and torque of the rotor designated for the heptagonal solution based on the component of the relative velocity of water moving towards the rotor blades.
Źródło:
Structure and Environment; 2012, 4, 2; 36-40
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simulation analysis of behaviour of ship-borne helicopter main rotor due to ship motion
Autorzy:
Stanisławski, J.
Powiązania:
https://bibliotekanauki.pl/articles/243038.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
helicopter
rotor blade
ship deck operation
Opis:
The paper presents a simulation method of analysis of the couplings between rotor blades motion and helicopter fuselage standing on ship deck at the phase of take-off or landing when whirling rotor generates thrust less than weight of the helicopter. The oscillating motion of the ship deck due to waves is considered. The physical model includes the helicopter fuselage treated as the stiff body supported by units of springs and dampers corresponding to landing gear characteristics. The rotor blades are modelled by elastic axes with distributed lumped masses of blade segments. The equations of fuselage and rotor blades motion are solved applying Runge-Kutta method. According to the Galerkin method, parameters of rotor blades motion are assumed as a resultant combination of considered blade torsion and bending eigen modes. Data of the light helicopter with three-bladed rotor are applied for the simulation of the rotorcraft behaviour aboard the ship. The calculations concerning helicopter standing on the fixed plane and on oscillating ship deck show influence of ship movement on fuselage motion and rotor blades deflections, flapping, and lead-lag motion. Moreover, simulations show influence of the side wind and control of the rotor swash-plate deflections. The additional unit of blade eigen modes and frequencies is applied to model the blade hitting to the flapping limiter, which can occur at the low rotation speed of the rotor. Temporary contact of the articulated blade with limiter changes its boundary conditions, which can rapidly increase the blade bending moments. The simulation method enables to determine conditions of safe operations of ship-borne helicopters without exceeding the limits and generating the excessive blade loads.
Źródło:
Journal of KONES; 2016, 23, 1; 313-320
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Very-Low-Speed Sensorless Control Induction Motor Drive with Online Rotor Resistance Tuning by Using MRAS Scheme
Autorzy:
Zorgani, Youssef Agrebi
Jouili, Mabrouk
Koubaa, Yassine
Boussak, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/1193692.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
induction motor
stator flux orientation model
model reference adaptive system
MRAS
rotor speed estimation
resistance estimation
programmable cascaded low-pass filters
PCLPF
Opis:
A sensorless indirect stator-flux-oriented control (ISFOC) induction motor drive at very low frequencies is presented herein. The model reference adaptive system (MRAS) scheme is used to estimate the speed and the rotor resistance simultaneously. However, the error between the reference and the adjustable models, which are developed in the stationary stator reference frame, is used to drive a suitable adaptation mechanism that generates the estimates of speed and the rotor resistance from the stator voltage and the machine current measurements. The stator flux components in the stationary reference frame are estimated through a pure integration of the back electro-motive force (EMF) of the machine. When the machine is operated at low speed, the pure integration of the back EMF introduces an error in flux estimation which affects the performance torque and speed control. To overcome this problem, pure integration is replaced with a programmable cascaded low-pass filter (PCLPF). The stability analysis method of the MRAS estimator is verified in order to show the robustness of the rotor resistance variations. Experimental results are presented to prove the effectiveness and validity of the proposed scheme of sensorless ISFOC induction motor drive.
Źródło:
Power Electronics and Drives; 2019, 4, 39; 125-140
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A very-low-speed sensorless control induction motor drive with online rotor resistance tuning by using MRAS scheme
Autorzy:
Agrebi Zorgani, Y.
Jouili, M.
Koubaa, Y.
Boussak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1193675.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
induction motor
stator flux orientation model
model reference adaptive system
MRAS
rotor speed estimation
resistance estimation
programmable cascaded low-pass filters
PCLPF
Opis:
A sensorless indirect stator-flux-oriented control (ISFOC) induction motor drive at very low frequencies is presented herein. The model reference adaptive system (MRAS) scheme is used to estimate the speed and the rotor resistance simultaneously. However, the error between the reference and the adjustable models, which are developed in the stationary stator reference frame, is used to drive a suitable adaptation mechanism that generates the estimates of speed and the rotor resistance from the stator voltage and the machine current measurements. The stator flux components in the stationary reference frame are estimated through a pure integration of the back electro-motive force (EMF) of the machine. When the machine is operated at low speed, the pure integration of the back EMF introduces an error in flux estimation which affects the performance torque and speed control. To overcome this problem, pure integration is replaced with a programmable cascaded low-pass filter (PCLPF). The stability analysis method of the MRAS estimator is verified in order to show the robustness of the rotor resistance variations. Experimental results are presented to prove the effectiveness and validity of the proposed scheme of sensorless ISFOC induction motor drive.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 171-186
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A wind turbine of a new type
Nowy typ turbiny wiatrowej
Autorzy:
Grebenikov, V.
Кауаn, V.
Szymczak, P.
Pryjmak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1367747.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
Darrieus wind rotor
electric generator
permanent magnets
electromagnetic torque
wirnik wiatrowy Darrieusa
generator elektryczny
magnesy trwałe
moment elektromagnetyczny
Opis:
W artykule przedstawiono wyniki badań dotyczących możliwości podwyższenia efektywności wykorzystania energii wiatru oraz poprawy charakterystyk dynamicznych wirnika wiatrowego Darrieusa z łopatami prostymi. Pokazano, że przez regulację orientacji łopat wirnika w stosunku do kierunku przepływu wiatru można zoptymalizować wartość momentu obrotowego na wale wirnika. Pokazano zdolność wirnika z łopatami regulowanymi do rozruchu przy bardzo niskich prędkościach przepływu wiatru oraz znaczną poprawę współczynników wykorzystania energii przepływu i momentu obrotowego na wale wirnika wiatrowego w porównaniu z analogicznym wirnikiem z łopatami sztywno ustalonymi. Przedstawiono wyniki obliczeń rozkładu pola magnetycznego w generatorze elektrycznym z magnesami trwałymi oraz zależność momentu elektromagnetycznego od pozycji wirnika względem stojana. Przedstawiono także wyniki obliczeń charakterystyk dynamicznych generatora, porównano wartości obliczone z otrzymanymi w trakcie badań.
The results of studies on possibility of increasing efficiency in the use of wind energy and improving the dynamic characteristics of Darrieus wind rotor with straight blades are described. It is shown how the values of torque on the rotor shaft may be optimized by controlling the orientation of the rotor blades relative to the oncoming flow. The ability of the rotor with controlled blades to self-start at a very low speed of wind flow as well as a significant increase in utilization factors of energy flow and torque on the shaft of wind rotor compared with the same rotor with rigidly fixed blades are shown. The results of calculation of the magnetic field inside the electric generator with permanent magnets and the dependence of electromagnetic torque on the position of the rotor relative to the stator are presented. Also, the results of calculation of the dynamic characteristics of electric generator and the comparison of calculated values with experimental ones are shown.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2015, 2, 106; 269-274
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 378

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