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    Wyświetlanie 1-7 z 7
    Tytuł:
    Topology analysis and parameter design of three-level multi-input DC/DC converter based on multi-source access
    Autorzy:
    Tian, Jingjing
    Qu, Jiaoping
    Zhao, Feng
    Chen, Xiaoqiang
    Wang, Ying
    Gan, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/2202547.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi-input converter
    parameter design
    power sharing
    three-level
    topology analysis
    Opis:
    A three-level multi-input DC/DC converter is proposed to solve the problems of complex interface circuit structure and high economic cost for multi-source access to the joint power supply distribution system. In this structure, multiple dc sources are integrated into a three-level DC/DC converter. In comparison with the two-stage counterpart, two active switches and boost diodes are eliminated, while two blocking diodes are added to block the reverse current from the dc-link capacitors. In addition, when the input inductors work in the discontinuous conduction mode, power sharing among different input sources can be achieved by properly selecting the inductance value. The working principle of the converter is analyzed by introducing nine working modes in detail and deriving the steady-state relationship expressions. The parameter range of the element is determined and the design process of a group of dynamic parameter values is shown. Finally, the power electronics real-time simulation platform is built based on StarSim HIL and the corresponding experimental waveforms are given to verify the topology and analysis.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 1; 59--80
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production efficiency of major crops among smallholder farmers in central Ethiopia
    Autorzy:
    Eskeziaw, Masresha Y.
    Ketema, Mengistu
    Haji, Jema
    Bekele, Ketema
    Powiązania:
    https://bibliotekanauki.pl/articles/1879428.pdf
    Data publikacji:
    2021-10-02
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
    Tematy:
    Efficiency
    DEA
    Crop production
    Multi input-output
    Smallholders
    Opis:
    Agricultural production of most smallholders in Ethiopia is dependent with recurrent rainfall resulted in production variations. Limited input availability and precarious environmental conditions determine smallholders’ decisions on their production and the production efficiencies vary from farmer to farmer. This study was carried out with the aim of analyzing the technical, allocative and economic efficiencies of smallholder farmers in the production of major crops and their determinants in central Ethiopia, Oromia special zone surrounding Addis Ababa. Multistage sampling technique was employed to randomly and proportionally select 386 smallholders from ten PAs. Primary data were collected from smallholders through a semi structured questionnaire using face to face interview. Cross sectional data collected from sampled households in the study area were analyzed using mathematical and econometric methods. Mathematical programming technique selected for this study was Data Envelopment Analysis (DEA) using linear programming technique assuming multi-input and multi-outputs were handled. Tobit regression model was regressed against the socioeconomic, demographic, and institutional variables that are expected to affect the technical, allocative and economic efficiencies of sampled households. The results of estimated efficiency scores show the mean technical, allocative and economic efficiencies were 0.75, 0.60 and 0.45 respectively. The mean scores of efficiencies show underutilization of resources and the possibilities of smallholders to increase their agricultural production by 25%, and reduce cost of production by 40% and total cost by 55%. Marital status, level of education, farming experience, access to credit, cooperative membership, access to farming information, and off/non-farm income has positive influence on the technical, allocative and economic efficiencies. While age of the household head, access to training and livestock size has negative relations to efficiencies. Delivery of agricultural inputs and trainings on time by the government is the key policy implication to improve the efficiencies of smallholders.  
    Źródło:
    Journal of Agribusiness and Rural Development; 2021, 61, 3
    1899-5241
    Pojawia się w:
    Journal of Agribusiness and Rural Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multivariable Adaptive Controller for the Nonlinear MIMO Model of a Container Ship
    Autorzy:
    Brasel, M.
    Dworak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/117137.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Multi-Input
    Multi-Output (MIMO)
    MIMO System
    MIMO Model
    Container Ship
    Adaptive Controller
    MATLAB
    Nonlinear Model
    Algorithm
    Opis:
    The paper presents an adaptive multivariable control system for a Multi-Input, Multi-Output (MIMO) nonlinear dynamic process. The problems under study are exemplified by a synthesis of a course angle and forward speed control system for the nonlinear four-Degrees-of-Freedom (4-DoF) mathematical model of a single-screw, high-speed container ship. The paper presents the complexity of the assumed model to be analyzed and a synthesis method for the multivariable adaptive modal controller. Due to a strongly nonlinear nature of the ship movements equations a multivariable adaptive controller is tuned in relation to changeable hydrodynamic operating conditions of the ship. In accordance with the given operating conditions controller parameters are chosen on the basis of four measured auxiliary signals. The system synthesis is carried out by linearization of the nonlinear model of the ship at its nominal operating points in the steady-state and by means of a pole placement control method. The final part of the paper includes results of simulation tests of the proposed control system carried out in the MATLAB/Simulink environment along with conclusions and final remarks.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 41-47
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The queueing system M2X/M/n with hysteretic control of the input flow intensity
    Autorzy:
    Zhernovyi, Y.
    Kopytko, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/122868.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    multi-channel queueing system
    batch arrival of customers
    hysteretic control of the input flow intensity
    stationary characteristics
    Opis:
    We consider a multi-channel queueing system with unlimited queue and with exponentially distributed service time and the intervals between the arrival of customers batches, which uses a hysteretic control mechanism of the input flow intensity. The system receives two independent flows of customers, one of which is blocked in an overload mode. An algorithm for finding the stationary distribution of the number of customers and stationary characteristics (the mean queue length, the mean waiting time in the queue, the probability of customers loss) is proposed. The obtained results are verified with the help of a simulation model constructed with the assistance of GPSS World tools.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 1; 149-161
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-input multi-output fuzzy logic controller for utility electric vehicle
    Autorzy:
    Gasbaoui, B.
    Abdelkader, Ch.
    Adellah, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/141051.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pojazd elektryczny
    modulacja wektora przestrzennego
    sterowanie rozmyte
    electric vehicle
    electronic differential
    space vector modulation
    fuzzy logic control
    multi-input multi-output fuzzy logic control
    Opis:
    Currently commercialization of electric vehicle (EV) is based to minimize the time of starting and acceleration. To undergo this problem multi-input multi-output fuzzy logic controller (MIMO-FLC) affect on propelled traction system forming MMS process was proposed. This paper introduces a MIMO-FLC applied on speeds of electric vehicle, the electric drive consists of two directing wheels and two rear propulsion wheels equipped with two light weight induction motors. The EV is powered by two motors of 37 kilowatts each one, delivering a 476 Nm total torque. Its high torque (476Nm) is instantly available to ensure responsive acceleration performance in built-up areas. Acceleration and steering are ensured by an electronic differential system which maintains robust control for all cases of vehicle behavior on the road. It also allows controlling independently every driving wheel to turn at different speeds in any curve. Direct torque control based on space vector modulation (DTC-SVM) is proposed to achieve the tow rear driving wheel control. The MIMO-FLC control technique is simulated in MATLAB SIMULINK environment. The simulation results have proved that the MIMO-FLC method decreases the transient oscillations and assure efficiency comportment in all type of road constraints, straight, slope, descent and curved road compared to the single input single output fuzzy controller (SISO-FLC).
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 3; 239-256
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On possibility of applying the MFC idea to control the MIMO processes
    O możliwości zastosowania układu MFC do sterowania procesami o wielu wejściach i wielu wyjściach
    Autorzy:
    Dworak, P.
    Pietrusewicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/155139.pdf
    Data publikacji:
    2006
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    dynamiczne odsprzęganie
    regulacja odporna
    regulacja typu model-following
    układy MIMO
    wielowymiarowe układy sterowania
    dynamic decoupling
    robust control
    MIMO (multi-input multi-output)
    multivariable control systems
    Opis:
    The paper presents results of comparative analysis of the control system introducing dynamic decoupling and the robust two-degrees of freedom control system with the use of the decoupled model of the MIMO process. The model loop of the MFC is designed with the use of dynamic decoupling algorithm. The correcting controller in the secondary loop uses the control law based on the knowledge of difference between the model and the process outputs. It is a static diagonal matrix. Presented comparative results from the tracking processes of yaw angle and position of the drillship point the possibility to introduce the MFC scheme into the control system of such process. Model and the main control loop are derived for the nominal case. The results obtained for the other working conditions shows the advantages of proposed here solution.
    Artykuł prezentuje wyniki analizy porównawczej układu regulacji dla obiektów o wielu wejściach i wielu wyjściach MIMO, zaprojektowanego z użyciem algorytmu dynamicznego odsprzęgania, oraz odpornego układu regulacji MFC; zakłada się przy tym, że w pętli głównej regulator wyznaczony jest w drodze syntezy z użyciem dynamicznego odsprzęgania dla nominalnego modelu liniowego, wyznaczonego dla wybranego punktu pracy obiektu, natomiast regulator korekcyjny, bazujący na informacji na temat różnicy pomiędzy wyjściami modelu i procesu ma postać diagonalnej macierzy wzmocnień. Przedstawione porównanie procesu regulacji pozycji i kąta kursowego statku wiertniczego dla omawianych rozwiązań wskazuje na możliwość wykorzystania układu MFC do sterowania tego typu procesem. Model oraz główna pętla sterowania obliczane są dla nominalnego kąta kursowego, natomiast wyniki uzyskane dla innej wartości tegoż kąta wykazują, że proponowane w pracy rozwiązanie zachowuje dobre właściwości dla znaczącej perturbacji kąta kursowego statku.
    Źródło:
    Pomiary Automatyka Kontrola; 2006, R. 52, nr 11, 11; 25-29
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a robust adaptive fuzzy controller globally stabilizing the multi-input nonlinear system with state-dependent uncertainty
    Autorzy:
    Park, Y.
    Park, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/205909.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sterowanie rozmyte
    sterownik rozmyty adaptacyjny
    układ dynamiczny
    adaptive fuzzy controller
    fuzzy inference
    multi-input nonlinear system
    robustness
    state-dependent uncertainties
    Opis:
    In this paper a novel robust adaptive fuzzy controller is proposed for the nonlinear system with state-dependent uncertainty. Compared with the conventional adaptive fuzzy controller that determines the function which bounds the uncertainty in the system dynamics by off-line calculation on the local state space, the proposed method determines that function by the fuzzy inference so that guarantees the stability of the closed loop system globally on the whole state space. In addition the method is applied to the multi-input system. We applied the proposed method to the Burn Control of the Tokamak fusion reactor whose dynamical equations contain the state-dependent uncertainty and proved the effectiveness of the scheme by the simulation results.
    Źródło:
    Control and Cybernetics; 1998, 27, 4; 613-629
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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