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    Wyświetlanie 1-9 z 9
    Tytuł:
    Effect of minimum energy control on steel loss in VR stepper motor
    Autorzy:
    Bernat, J.
    Kołota, J.
    Stępień, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/141426.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy consumption
    lamination
    finite element method
    optimal control
    Opis:
    This research presents a 3D FE method for the simulation of the variable reluctance stepper motor dynamics. The proposed model is used to obtain the optimal minimum energy control law that minimizes the energy injected by the controller. The method is based on the strong coupling of field - circuit equations and extended to eddy current, motion and nonlinearity problem. The linearization technique for the coupled problem is presented. Also the lamination of the motor core is considered. In the paper the open - loop control problem is analyzed. The proposed model is validated by the comparison with measurements. Next, to demonstrate the effectiveness of the proposed optimal minimum energy control method is applied. In both cases, the examination of the variable reluctance stepper motor dynamics and the steel loss in the core is presented and compared.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 3; 439-447
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Nearly Optimal Fractional Delay Filter Design Using an Asymmetric Window
    Autorzy:
    Sac, M.
    Blok, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/227063.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    asymmetric window
    extracted window
    fractional delay filter
    nearly optimal filter
    window method
    Opis:
    In this paper a numerically efficient filter design method suitable for variable fractional delay (VFD) filter implementation is investigated. We propose to use a well known window method with an asymmetric window extracted from optimal filter designed beforehand. As we will demonstrate, such an approach, if additional gain correction is applied, allows for nearly optimal VFD filter design. Thus, the proposed approach combines window method simplicity with performance comparable to that of optimal filters. Efficiency of the presented technique makes it suitable for designing filters with varying delay in real time
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 4; 465-472
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hybrid method for the optimal reactive power dispatch and the control of voltagesin an electrical energy network
    Autorzy:
    Benchabira, Aissa
    Khiat, Mounir
    Powiązania:
    https://bibliotekanauki.pl/articles/140740.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical energy network
    interior point method (IPM)
    optimal reactive power dispatch (ORPD)
    particle swarm optimization (PSO)
    Opis:
    This paper presents the resolution of the optimal reactive power dispatch (ORPD) problem and the control of voltages in an electrical energy system by using a hybrid algorithm based on the particle swarmoptimization (PSO) method and interior point method (IPM). The IPM is based on the logarithmic barrier (LB-IPM) technique while respecting the non-linear equality and inequality constraints. The particle swarmoptimization-logarithmic barrier-interior point method (PSO-LB-IPM) is used to adjust the control variables, namely the reactive powers, the generator voltages and the load controllers of the transformers, in order to ensure convergence towards a better solution with the probability of reaching the global optimum. The proposed method was first tested and validated on a two-variable mathematical function using MATLAB as a calculation and execution tool, and then it is applied to the ORPD problem to minimize the total active losses in an electrical energy network. To validate the method a testwas carried out on the IEEE electrical energy network of 57 buses.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 3; 535-551
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of multi-objective fruit fly optimisation algorithm based on population Manhattan distance in distribution network reconfiguration
    Autorzy:
    Tang, Minan
    Zhang, Kaiyue
    Wang, Qianqian
    Cheng, Haipeng
    Yang, Shangmei
    Du, Hanxiao
    Powiązania:
    https://bibliotekanauki.pl/articles/1841286.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Chebyshev chaotic mapping
    distributed generation
    distribution network reconfiguration
    fuzzy decision method
    Pareto optimal
    pmdMOFOA
    population Manhattan distance
    Opis:
    In order to optimise the operation state of the distribution network in the presence of distributed generation (DG), to reduce network loss, balance load and improve power quality in the distribution system, a multi-objective fruit fly optimisation algorithm based on population Manhattan distance (pmdMOFOA) is presented. Firstly, the global and local exploration abilities of a fruit fly optimisation algorithm (FOA) are balanced by combining population Manhattan distance (PMD) and the dynamic step adjustment strategy to solve the problems of its weak local exploration ability and proneness to premature convergence. At the same time, Chebyshev chaotic mapping is introduced during position update of the fruit fly population to improve ability of fruit flies to escape the local optimum and avoid premature convergence. In addition, the external archive selection strategy is introduced to select the best individual in history to save in external archives according to the dominant relationship amongst individuals. The leader selection strategy, external archive update and maintenance strategy are proposed to generate a Pareto optimal solution set iteratively. Lastly, an optimal reconstruction scheme is determined by the fuzzy decision method. Compared with the standard FOA, the average convergence algebra of a pmdMOFOA is reduced by 44.58%. The distribution performance of non-dominated solutions of a pmdMOFOA, MOFOA, NSGA-III and MOPSO on the Pareto front is tested, and the results show that the pmdMOFOA has better diversity. Through the simulation and analysis of a typical IEEE 33-bus system with DG, load balance and voltage offset after reconfiguration are increased by 23.77% and 40.58%, respectively, and network loss is reduced by 57.22%, which verifies the effectiveness and efficiency of the proposed method.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 307-323
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infinite time horizon optimal current control of a stepper motor exploiting a finite element model
    Autorzy:
    Bernat, J.
    Stępień, S.
    Stranz, A.
    Szymański, G.
    Sykulski, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200378.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimal control theory
    linear quadratic problem
    finite element method
    teoria sterowania optymalnego
    liniowo-kwadratowy problem
    metoda elementów skończonych
    Opis:
    An optimal control theory based method is presented aiming at minimizing the energy delivered from source and the power loss in a stepper motor circuit. A linear quadratic current regulator with an infinite time horizon is employed and its appropriateness for this type of a problem explained. With the purpose of improving the accuracy of the control system, the self and mutual inductances of windings are calculated using a finite element model. The numerically computed results are verified experimentally.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 835-841
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal form-finding of cable systems
    Optymalne kształtowanie konstrukcji cięgnowych
    Autorzy:
    Dzierżanowski, G.
    Wójcik-Grząba, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/231399.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    konstrukcja cięgnowa
    kształtowanie optymalne
    minimum ciężaru
    metoda gęstości sił
    cable system
    optimal form-finding
    minimum weight
    force density method
    Opis:
    W artykule rozważane są zagadnienia związane z projektowaniem wstępnie napiętych konstrukcji cięgnowych. Głównym celem jest znalezienie konfiguracji kinematycznie niezmiennej o minimalnym ciężarze. W odróżnieniu od typowych zagadnień optymalizacji topologicznej celem zadania nie jest optymalizacja konstrukcji pod działaniem konkretnego obciążenia, chociaż zastosowana metoda rozwiązania jest podobna. Na początku formułujemy problem wariacyjny poszukiwania kształtu konstrukcji, a następnie przedstawiamy numeryczną procedurę iteracyjną służącą do znajdowania optymalnego położenia węzłów siatki cięgnowej.
    Tensile structures in general, achieve their load-carrying capability only after the process of initial form-finding. From the mechanical point of view, this process can be considered as a problem in statics. As cable systems are close siblings of trusses (cables, however, can carry tensile forces only), in our study we refer to equilibrium equation similar to those known from the theory of the latter. In particular, the paper regards designing pre-tensioned cable systems, with a goal to make them kinematically stable and such that the weight of so designed system is lowest possible. Unlike in typical topology optimization problems, our goal is not to optimize the structural layout against a particular applied load. However, our method uses much the same pattern. First, we formulate the variational problem of form-finding and next we describe the corresponding iterative numerical procedure for determining the optimum location of nodes of the cable system mesh. We base our study on the concept of force density which is a ratio of an axial force in cable segment to its length.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 305-321
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal input signal design for fractional-order system identification
    Autorzy:
    Jakowluk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/202155.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fractional calculus
    optimal input design
    Oustaloup recursive method
    parameter identification
    rachunek różniczkowy
    optymalizacja pobudzenia
    metoda rekurencyjna
    Oustaloup
    identyfikacja parametrów
    Opis:
    The optimal design of excitation signal is a procedure of generating an informative input signal to extract the model parameters with maximum pertinence during the identification process. The fractional calculus provides many new possibilities for system modeling based on the definition of a derivative of noninteger-order. A novel optimal input design methodology for fractional-order systems identification is presented in the paper. The Oustaloup recursive approximation (ORA) method is used to obtain the fractional-order differentiation in an integer order state-space representation. Then, the presented methodology is utilized to solve optimal input design problem for fractional-order system identification. The fundamental objective of this approach is to design an input signal that yields maximum information on the value of the fractional-order model parameters to be estimated. The method described in this paper was verified using a numerical example, and the computational results were discussed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 37-44
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Searching for optimal prestressing of steel bar structures based on sensitivity analysis
    Autorzy:
    Yurchenko, V. V.
    Peleshko, I. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/230774.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optymalizacja parametryczna
    element zbędny
    siła sprężająca początkowa
    sprężenie optymalne
    analiza wrażliwości
    metoda rzutowania gradientowego
    parametric optimization
    redundant member
    initial prestressing force
    optimal prestressing
    sensitivity analysis
    gradient projection method
    Opis:
    The paper considers parametric optimization problems for the steel bar structures formulated as nonlinear programming ones with variable unknown cross-sectional sizes of the structural members, as well as initial prestressing forces introduced into the specified redundant members of the structure. The system of constraints covers load-bearing capacity constraints for all the design sections of the structural members subjected to all the design load combinations at ultimate limit state, as well as displacement constraints for the specified nodes of the bar system, subjected to all design load combinations at serviceability limit state. The method of the objective function gradient projection onto the active constraints surface with simultaneous correction of the constraints violations has been used to solve the parametric optimization problem. A numerical technique to determine the optimal number of the redundant members to introduce the initial prestressing forces has been offered for high-order statically indeterminate bar structures. It reduces the dimension for the design variable vector of unknown initial prestressing forces for considered optimization problems.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 525-540
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of multi-criteria decision making methods for the assessment of optimal SVC location
    Autorzy:
    Aydin, Faruk
    Gümüş, Bilal
    Powiązania:
    https://bibliotekanauki.pl/articles/2173650.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Borda count method
    FACTS
    MCDM
    optimal location
    PSAT
    voltage stability
    flexible alternating current transmission system
    power system analysis toolbox
    multi criteria decision making
    metoda liczenia Bordy
    podejmowanie decyzji wielokryterialnej
    lokalizacja optymalna
    stabilność napięcia
    elastyczne systemy przesyłowe prądu przemiennego
    narzędzia do analizy systemu zasilania
    Opis:
    The goal of multi-criteria decision making (MCDM) is to select the most appropriate of the alternatives by evaluating many conflicting criteria together. MCDM methods are widely available in the literature and have been used in various energy problems. The key problems studied in electrical power systems in recent years have included voltage instability and voltage collapse. Different flexible alternating current transmission systems (FACTS) equipment has been used for this purpose for decades, increasing voltage stability while enhancing system efficiency, reliability and quality of supply, and offering environmental benefits. Finding the best locations for these devices in terms of voltage stability in actual electrical networks poses a serious problem. Many criteria should be considered when determining the most suitable location for the controller. The aim of this paper is to provide a comparative analysis of MCDM techniques to be used for optimal location of a static VAR compensator (SVC) device in terms of voltage stability. The ideal location can be determined by means of sorting according to priority criteria. The proposed approach was carried out using the Power System Analysis Toolbox (PSAT) in MATLAB in the IEEE 14-bus test system. Using ten different MCDM methods, the most appropriate locations were compared among themselves and a single ranking list was obtained, integrated with the Borda count method, which is a data fusion technique. The application results showed that the methods used are consistent among themselves. It was revealed that the integrated model was an appropriate method that could be used for optimal location selection, providing reliable and satisfactory results to power system planners.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140555
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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