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    Wyświetlanie 1-13 z 13
    Tytuł:
    Analysis and synthesis of converter control system of autonomous induction generator with field oriented control
    Autorzy:
    Jakubowski, B.
    Pieńkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/141329.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    induction generator
    converter control
    field oriented control
    synthesis of control system
    Opis:
    The paper presents the mathematical model of an autonomous induction generator with the AC load circuit and the converter control system of the voltage magnitude at the terminals of stator generator. The control algorithm and the structure of the control system are described. The simulation results of the control system are presented and discussed.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 2; 267-279
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of A/D quantization in an interpolated DFT based system of power control with a small delay
    Autorzy:
    Borkowski, J.
    Kania, D.
    Mroczka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221386.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaic system
    frequency estimation
    signal processing
    A/D converter
    control of power system
    Opis:
    Fast and accurate grid signal frequency estimation is a very important issue in the control of renewable energy systems. Important factors that influence the estimation accuracy include the A/D converter parameters in the inverter control system. This paper presents the influence of the number of A/D converter bits b, the phase shift of the grid signal relative to the time window, the width of the time window relative to the grid signal period (expressed as a cycle in range (CiR) parameter) and the number of N samples obtained in this window with the A/D converter on the developed estimation method results. An increase in the number b by 8 decreases the estimation error by approximately 256 times. The largest estimation error occurs when the signal module maximum is in the time window center (for small values of CiR) or when the signal value is zero in the time window center (for large values of CiR). In practical applications, the dominant component of the frequency estimation error is the error caused by the quantization noise, and its range is from approximately 8×10-10 to 6×10-4.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 423-432
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structures of vector control of n-phase motor drives based on generalized Clarke transformation
    Autorzy:
    Janaszek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200409.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric drive
    electric motor
    vector control of multiphase system
    Clarke's transformation
    napęd elektryczny
    silnik elektryczny
    transformata Clarka
    system wielofazowy
    sterowanie wektorowe
    Opis:
    The paper presents vector control structures for n-phase AC motors derived from generalized Clarke transformation. In contrast to known works, where authors operate on generalized formulas of the Clarke transformation, in this work, only a number of actually used phases, of mostly industrial purposes, are considered (n = 5, 6, 2×3). This allows to perform control calculations in stationary orthogonal coordinates aβ or rotating dq. There are implementations of different control strategies: ROC (rotor-oriented control) or FOC (field-oriented control). Next, the paper presents the novel concept of a voltage modulator designed for multi-phase drive systems. Operation of the modulator is based on the extended Clarke transformation for multiphase systems. A mathematical model of the multiphase voltage modulator, operating in open-loop and closed-loop current control has been presented. Some selected oscillograms of voltage and current waveform, which illustrate properties of proposed control structures have been presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 865-872
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Formulas Obtained for Analytical and LQ Idea Approaches to Determine the Optimal Actuator Location in Active Multimodal Beam Vibration Reduction
    Autorzy:
    Żołopa, E.
    Brański, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177078.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beam
    actuator
    active vibration reduction
    LQ problem
    system control
    control of vibration
    Opis:
    In this paper an active multimodal beam vibration reduction via one actuator is considered. The optimal actuator distribution is analyzed with two methods: an exact mathematical principles and the LQ problem idea. It turned out that the same mathematical expressions are derived. Thus, these methods are equivalent.
    Źródło:
    Archives of Acoustics; 2014, 39, 4; 599-603
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Existence of optimal control for multi-order fractional optimal control problems
    Autorzy:
    Kamocki, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/2134888.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    existence of optimal control
    multi-order fractional control system
    lower closure theorem
    Opis:
    In this article we focus on optimal control problems involving a nonlinear fractional control system of different orders with Caputo derivatives, associated to a Lagrange cost functional. Based on a lower closure theorem for orientor fields combined with Filippov’s approach, we derive an existence result for at least one optimal solution for such a problem.
    Źródło:
    Archives of Control Sciences; 2022, 32, 2; 279--303
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metrological Analysis of Precision of the System of Delivering a Water Capsule for Explosive Production of Water Aerosol
    Autorzy:
    Śmigielski, G.
    Toczek, W.
    Dygdała, R.
    Stefański, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/221553.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    water capsule airdrop control system
    uncertainty analysis
    GUM uncertainty framework
    propagation of distributions
    Opis:
    In this paper precision of the system controlling delivery by a helicopter of a water capsule designed for extinguishing large scale fires is analysed. The analysis was performed using a numerical method of distribution propagation (the Monte Carlo method) supplemented with results of application of the uncertainty propagation method. In addition, the optimum conditions for the airdrop are determined to ensure achieving the maximum area covered by the water capsule with simultaneous preserving the precision level necessary for efficient fire extinguishing.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 1; 47-58
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Selected Parameters of Pressure Die Casting on Quality of AlSi9Cu3 Castings
    Autorzy:
    Pałyga, Ł.
    Stachowicz, M.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/379795.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pressure die casting
    modernisation
    control system
    tensile test
    strength of materials
    odlewanie ciśnieniowe
    system sterowania
    próba rozciągania
    wytrzymałość materiałów
    Opis:
    This paper presents the results on the effects of die-casting process on the strength parameters of castings of the aluminium AlSi9Cu3 alloy belonging to the group of EN AB-46000, made on renovated high pressure die-casting machine. Specimens for quality testing were taken from the places of the casting most loaded during the service. The aim of a research was to prove how the new die-casting process control capabilities influence on the tensile strength of the cast material defined as a value of the breaking force of the specimens. It has been found that it is possible to specify a set of recommended settings valves of second (II) and third (III) phase, which are responsible for filling the metal mould on die-casting pressure machine. From the point of view of the finished cast element, it was noticed that exceeding the prescribed values of valve settings does not bring further benefits and even causes unnecessary overload and reduce the durability of the mold. Moreover, it was noticed that reduction of the predetermined setting of the second phase (II) valve leads to the formation of casting defects again.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 85-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal control problem for infinite variables hyperbolic systems with time lags
    Autorzy:
    Bahaa, G. M.
    Tharwat, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/229952.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimal control
    hyperbolic system
    time delay
    distributed control problems
    Neumann conditions
    existence and uniqueness of solutions
    second order operator with an infinite number of variables
    Opis:
    In this paper, by using the theorems of [Lions (1971) and Lions & Magenes (1972)], the optimal control problem for distributed hyperbolic systems, involving second order operator with an infinite number of variables, in which constant lags appear both in the state equations and in the boundary conditions is considered. The optimality conditions for Neumann boundary conditions are obtained and the set of inequalities that characterize these conditions is formulated. Also, several mathematical examples for derived optimality conditions are presented. Finally, we consider an optimal distributed control problem for (n x n)-infinite variables hyperbolic systems.
    Źródło:
    Archives of Control Sciences; 2011, 21, 4; 373-393
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Stability Interval of the Set of Linear System
    Autorzy:
    Mazakov, Talgat
    Wójcik, Waldemar
    Jomartova, Sholpan
    Karymsakova, Nurgul
    Ziyatbekova, Gulzat
    Tursynbai, Aisulu
    Powiązania:
    https://bibliotekanauki.pl/articles/1844628.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    automatic control system
    stability
    matrix
    minor
    characteristic polynomial
    Hurwitz criterion
    Lienard-Shipard criterion of interval mathematics
    Lyapunov function
    Opis:
    The article considers the problem of stability of interval-defined linear systems based on the Hurwitz and LienardShipar interval criteria. Krylov, Leverier, and Leverier-Danilevsky algorithms are implemented for automated construction and analysis of the interval characteristic polynomial. The interval mathematics library was used while developing the software. The stability of the dynamic system described by linear ordinary differential equations is determined and based on the properties of the eigenvalues of the interval characteristic polynomial. On the basis of numerical calculations, the authors compare several methods of constructing the characteristic polynomial. The developed software that implements the introduced interval arithmetic operations can be used in the study of dynamic properties of automatic control systems, energy, economic and other non-linear systems.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 2; 155-161
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On real order passivity
    Autorzy:
    Gallegos, J. A.
    Duarte-Mermoud, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200762.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    passivity
    dissipativeness
    adaptive
    passivation
    nonlinear mixed-order system
    positive realness
    control of nonlinear systems
    pasywność
    rozproszenie
    adaptacja
    pasywacja
    Opis:
    The aim of this paper is to show that a real order generalization of the dissipative concepts is a useful tool to determine the stability (in the Lyapunov and in the input-output sense) and to design control strategies not only for fractional order non-linear systems, but also for systems composed of integer and fractional order subsystems (mixed-order systems). In particular, the fractional control of integer order system (e.g. PI? control) can be formalized. The key point is that the gradations of dissipativeness, passivity and positive realness concepts are related among them. Passivating systems is used as a strategy to stabilize them, which is studied in the non-adaptive as well as in the adaptive case.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 3; 445-454
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Disassembly-free metrological control of analog-to-digital converter parameters
    Autorzy:
    Bubela, Tetiana
    Kochan, Roman
    Więcław, Łukasz
    Yatsuk, Vasyl
    Kuts, Victor
    Yatsuk, Jurij
    Powiązania:
    https://bibliotekanauki.pl/articles/2173896.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metrological support
    analog-to-digital converter
    non-disassembly control
    cyber-physical system
    nonlinearity
    additive component of error
    ACE
    multiplicative component of error
    Opis:
    The authors update the issue disassembly-free control and correction of all components of the error of measuring channels with multi-bit analog-to-digital converters (ADCs). The main disadvantages of existing methods for automatic control of the parameters of multi-bit ADCs, in particular their nonlinearity, are identified. Methods for minimizing instrumental errors and errors caused by limited internal resistances of closed switches, input and output resistances of active elements are investigated. The structures of devices for determining the multiplicative and nonlinear components of the error of multi-bit ADCs based on resistive dividers built on single-nominal resistors are proposed and analyzed. The authors propose a method for the correction of additive, multiplicative and nonlinear components of the error at each of the specified points of the conversion range during non-disassembly control of the ADC with both types of inputs. The possibility of non-disassembly control, as well as correction of multiplicative and nonlinear components of the error of multi-bit ADCs in the entire range of conversion during their on-site control is proven. ADC error correction procedures are proposed. These procedures are practically invariant to the non-informative parameters of active structures with resistive dividers composed of single-nominal resistors. In the article the prospects of practical implementation of the method of error correction during non-dismantling control of ADC parameters using the possibilities provided by modern microelectronic components are shown. The ways to minimize errors are proposed and the requirements to the choice of element parameters for the implementation of the proposed technical solutions are given. It is proved that the proposed structure can be used for non-disassembly control of multiplicative and nonlinear components of the error of precision instrumentation amplifiers.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 4; 669--684
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topology optimization for elastic base under rectangular plate subjected to moving load
    Autorzy:
    Jilavyan, S. H.
    Khurshudyan, A. Zh.
    Powiązania:
    https://bibliotekanauki.pl/articles/230086.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed system
    moving load
    Kirchhoff plate
    Winkler base
    topology optimization
    problem of moments
    L∞-optimal control
    distributions
    Bubnov–Galerkin procedure
    Opis:
    Distribution optimization of elastic material under elastic isotropic rectangular thin plate subjected to concentrated moving load is investigated in the present paper. The aim of optimization is to damp its vibrations in finite (fixed) time. Accepting Kirchhoff hypothesis with respect to the plate and Winkler hypothesis with respect to the base, the mathematical model of the problem is constructed as two–dimensional bilinear equation, i.e. linear in state and control function. The maximal quantity of the base material is taken as optimality criterion to be minimized. The Fourier distributional transform and the Bubnov–Galerkin procedures are used to reduce the problem to integral equality type constraints. The explicit solution in terms of two–dimensional Heaviside‘s function is obtained, describing piecewise–continuous distribution of the material. The determination of the switching points is reduced to a problem of nonlinear programming. Data from numerical analysis are presented.
    Źródło:
    Archives of Control Sciences; 2015, 25, 3; 289-305
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and control of an electro-hydraulic active suspension system
    Modelowanie i sterowanie aktywnego, hydro-elektrycznego systemu zawieszenia
    Autorzy:
    Ajala, O.
    Bestle, D.
    Rauh, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/140215.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vehicle dynamics
    modelling
    two-degree-of-freedom controler
    active suspension system
    full-car control
    dynamika pojazdu
    modelowanie
    sterownik o dwóch stopniach swobody
    aktywny system zawieszenia
    sterowanie samochodem
    Opis:
    Active suspension systems ease the conflict between comfort and handling. This requires the use of suitable actuators that in turn need to be efficiently controlled. This paper proposes a model-based control approach for a nonlinear suspension actuator. Firstly the concept is derived in the linear framework in order to simplify the synthesis and analysis phase. There a linear model of the actuator is proposed and discussed. Further, this design phase includes a comparison between model-free PID controllers and a newly proposed two-degree-of-freedom controller which allows one to shape reference and disturbance responses separately. Subsequently, the two-degree-of-freedom controller, which proves to be superior, is adapted to the nonlinear framework by considering a linear parameter varying representation of the nonlinear plant. Finally, the nonlinear controller is implemented in a test car confirming the concept applicability to real hardware.
    Aktywne systemy zawieszenia łagodzą konflikt między komfortem a właściwościami jezdnymi samochodu. Wymagają one użycia odpowiednich siłowników, a te z kolei powinny być efektywnie sterowane. W artykule zaproponowano opartą na modelowaniu koncepcję sterowania nieliniowego siłownika w zawieszeniu samochodu. Koncepcja tego rozwiązania jest początkowo przedstawiona w ramach opisu liniowego, co ma uprościć fazę syntezy i analizy. Na tym etapie jest proponowany i dyskutowany model liniowy. Ta faza projektowania obejmuje ponadto porównanie między niezwiązanymi z modelem sterownikami PID i proponowanym, nowym sterownikiem o dwu stopniach swobody, który pozwala niezależnie kształtować odpowiedź referencyjną i odpowiedź na zakłócenia. W dalszym etapie, dla sterownika o dwu stopniach swobody, który okazał sie lepszy od pozostałych, wprowadza się opis nieliniowy, traktując parametr liniowy jak zmienną reprezentację nieliniowego obiektu regulacji. Ostatecznie, nieliniowy sterownik zawieszenia jest instalowany w samochodzie testowym, a badania potwierdzają celowość zastosowania tej koncepcji w rzeczywistym sprzęcie.
    Źródło:
    Archive of Mechanical Engineering; 2013, LX, 1; 37-54
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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