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    Wyświetlanie 1-13 z 13
    Tytuł:
    A spectral method of the analysis of linear control systems
    Autorzy:
    Kurdyukov, Alexander P.
    Boichenko, Victor A.
    Powiązania:
    https://bibliotekanauki.pl/articles/329786.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    anisotropy based control theory
    anisotropic norm
    ℋ2-norm
    H∞ norm
    teoria sterowania
    norma anizotropowa
    norma H-nieskończoność
    Opis:
    A spectral method of the analysis of linear control systems is considered. Within the framework of this approach the σ-entropy of input signals and the σ-entropy norm of systems are introduced. The invariance of the introduced norm makes it possible to get invariant results of σ-entropy analysis.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 4; 667-679
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and numerical analysis of fracture in 41Cr4 steel – issues of the stationary cracks
    Autorzy:
    Graba, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265619.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    rozkład naprężeń
    pękanie
    stal 40H
    40H steel
    FEM
    J-integral
    CTOD
    crack initiation moment
    stress distribution
    parameters of the geometric constraints
    plastic region
    Opis:
    This paper analyzes the process of fracture in 41Cr4 steel on the basis of experimental and numerical data obtained for non-propagating cracks. The author’s previous and latest experimental results were used to determine the apparent crack initiation moment and fracture toughness for the material under plane strain conditions. Numerical simulations were carried out to assess changes in the J-integral, the crack tip opening displacement, the size of the plastic region and the distribution of stresses around the crack tip. A complex numerical analysis based on the true stress-strain curve was performed to determine the behavior of 41Cr4 steel under increasing external loads.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 37-63
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Loop-shaping h∞ control of an aeropendulum model
    Autorzy:
    Breganon, Ricardo
    Alves, Uiliam Nelson L. T.
    De Almeida, João Paulo L.S.
    Ribeiro, Fernando S. F.
    Mendonça, Marcio
    Palácios, Rodrigo H. C.
    Montezuma, Marcio A. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106458.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    modelowanie dynamiczne
    wahadło aerodynamiczne
    sterowanie
    dynamic system modeling
    aeropendulum
    H∞ control
    Opis:
    This work presents a mathematical model of an aeropendulum system with two sets of motors with propellers and the design and simulation of a loop-shaping h∞control for this system. In this plant, the objective is to control the angular position of the pendulum rod through the torque generated by the thrust of the motorized propellers at the end of the rod’s axis. The control design is obtained by first using feedback linearization and then designing the h∞ controller using the resulting linear system. For the control strategy validation, simulations were conducted in the Matlab/Simulink® environment, and the weighting functions for the h∞ controller were adjusted to obtain the desired performance and stability of the closed-loop system. The simulation results show the efficiency of the applied methodology.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 1--16
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Usuwanie WWA (C13-C16) ze ścieków przemysłowych z wykorzystaniem ditlenku diwodoru
    The use of dihydrogen dioxide to remove selected PAHs from industrial wastewater
    Autorzy:
    Turek, A.
    Włodarczyk-Makuła, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/372195.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    utlenianie
    H2O2
    WWA
    GC-MS
    ścieki przemysłowe
    oxidation
    PAHs
    industrial wastewater
    Opis:
    Podstawowym założeniem prowadzonych badań było określenie wpływu ditlenku diwodoru na usuwanie wybranych WWA ze ścieków przemysłowych. Do badań zastosowano ditlenek diwodoru w dawkach: 50 mg/l, 100 mg/l, 300 mg/l, 600 mg/l, 900 mg/l, 1000 mg/l i 2000 mg/l. Analizę ilościowo-jakościową WWA prowadzono z wykorzystaniem chromatografu gazowego ze spektrometrem masowym. Suma pięciu analizowanych węglowodorów zawierających od 13 do 16 atomow węgla w cząsteczce (z listy 16 EPA) wynosiła 16 [mi]g/l. Po procesie utleniania największe obniżenie sumarycznej zawartości badanych WWA, sięgający 82%, odnotowano przy dawce utleniacza wynoszącej 900 mg/l.
    The paper presents results of studies on oxidation of selected PAHs. For the oxidation of dihydrogen dioxide used in doses of 50 mg/l, 100 mg/l, 300 mg/l, 600 mg/l, 900 mg/l, 1000 mg/l and 2000 mg/l. Quantitative and qualitative analysis of PAHs was performed using a gas chromatograph mass spectrometer. The sum of five analyzed hydrocarbons (from a list of 16 EPA) was 16 ug /L. After oxidation of the greatest deficit of the total content of PAHs studied, reaching 82%, was recorded at a dosage of oxidant of 900 mg/L.
    Źródło:
    Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski; 2012, 145 (25); 56-64
    1895-7323
    Pojawia się w:
    Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An H∞ sliding mode observer for Takagi–Sugeno nonlinear systems with simultaneous actuator and sensor faults
    Autorzy:
    Ben Brahim, A.
    Dhahri, S.
    Ben Hmida, F.
    Sellami, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/330626.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault reconstruction
    fault estimation
    simultaneous fault
    H∞ sliding mode observer
    uncertain Takagi Sugeno system
    LMI optimization
    Opis:
    This paper considers the problem of robust reconstruction of simultaneous actuator and sensor faults for a class of uncertain Takagi–Sugeno nonlinear systems with unmeasurable premise variables. The proposed fault reconstruction and estimation design method with H∞ performance is used to reconstruct both actuator and sensor faults when the latter are transformed into pseudo-actuator faults by introducing a simple filter. The main contribution is to develop a sliding mode observer (SMO) with two discontinuous terms to solve the problem of simultaneous faults. Sufficient stability conditions in terms linear matrix inequalities are achieved to guarantee the stability of the state estimation error. The observer gains are obtained by solving a convex multiobjective optimization problem. Simulation examples are given to illustrate the performance of the proposed observer.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 3; 547-559
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automatic Control of Mechatronic Systems
    Autorzy:
    Schlacher, K.
    Kugi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/908321.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    mechatronika
    geometria różniczkowa
    sterowanie
    mechatronic systems
    differential geometry
    nonlinear H_{infty}-control
    passivity
    input-output linearization
    Opis:
    This contribution deals with different concepts of nonlinear control for mechatronic systems. Since most physical systems are nonlinear in nature, it is quite obvious that an improvement in the performance of the closed loop can often be achieved only by means of control techniques that take the essential nonlinearities into consideration. Nevertheless, it can be observed that industry often hesitates to implement these nonlinear controllers, despite all advantages existing from the theoretical point of view. On the basis of three different applications, a PWM-controlled dc-to-dc converter, namely the Cuk-converter, the problem of hydraulic gap control in steel rolling, and the design of smart structures with piezolelectric sensor and actuator layers, we will demonstrate how one can overcome these problems by exploiting the physical structure of the mathematical models of the considered plants.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2001, 11, 1; 131-164
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decentralized static output tracking control of interconnected and disturbed Takagi–Sugeno systems
    Autorzy:
    Jabri, Dalel
    Guelton, Kevin
    Belkhiat, Djamel E.C.
    Manamanni, Noureddine
    Powiązania:
    https://bibliotekanauki.pl/articles/331181.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    interconnected Takagi–Sugeno system
    decentralized static outputs tracking controller
    H∞ criterion
    LMIs
    model Takagi-Sugeno
    kontroler śledzenia
    Opis:
    This article describes a new procedure for the design of decentralized output-feedback tracking controllers for a class of interconnected Takagi–Sugeno (TS) fuzzy systems with external bounded disturbances and measurement noise. The main idea consists in transforming the decentralized tracking control problem, by using the descriptor redundancy formulation, to a robust decentralized stabilization one. The non-parallel distributed compensation (non-PDC) controllers proposed here are synthesized to satisfy robust H∞ tracking performance with disturbance attenuation. The decentralized controllers design conditions are given in terms of LMIs via extended quadratic Lyapunov functions. Finally, simulations are presented: two numerical examples are dedicated to compare the conservatism of the proposed approach regarding the previous results available in the literature; then, the effectiveness of the decentralized controller design methodology is illustrated with a closed-loop simulation of two inverted pendulums connected by a spring.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2020, 30, 2; 225-238
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regulation control of an underactuated mechanical system with discontinuous friction and backlash
    Autorzy:
    Rascón, R.
    Rosas, D.
    Hernandez-Balbuena, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/330564.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    underactuated mechanical system
    sliding mode control
    H infinity control
    discontinuous observer
    sterowany układ mechaniczny
    sterowanie ślizgowe
    obserwator nieciągły
    Opis:
    In this work, the problem of position regulation control is addressed for a 2DOF underactuated mechanical system with friction and backlash. For this purpose, a method combining sliding mode and H∞ control is developed. We prove that the application of the method to the nonlinear model considered results in an asymptotically stable equilibria set. Moreover, it is possible to achieve a sufficiently small and bounded steady-state position error even in the presence of disturbances by employing the proposed technique. That is, the developed controller is able to account not only for unmatched external perturbations and model discrepancies of the test rig considered, but also for matched bounded perturbations. The control methodology is presented from both the theoretical and experimental angles to demonstrate the good performance of the proposed controller.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 4; 785-797
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An efficient algorithm for adaptive total variation based image decomposition and restoration
    Autorzy:
    Liu, X.
    Huang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/330619.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    image decomposition
    image restoration
    adaptive total variation
    H-1 norm
    split Bregman method
    dekompozycja obrazu
    odtworzenie obrazu
    wariacja zupełna adaptacyjna
    metoda Bregmana
    Opis:
    With the aim to better preserve sharp edges and important structure features in the recovered image, this article researches an improved adaptive total variation regularization and H-1 norm fidelity based strategy for image decomposition and restoration. Computationally, for minimizing the proposed energy functional, we investigate an efficient numerical algorithm—the split Bregman method, and briefly prove its convergence. In addition, comparisons are also made with the classical OSV (Osher–Sole–Vese) model (Osher et al., 2003) and the TV-Gabor model (Aujol et al., 2006), in terms of the edge-preserving capability and the recovered results. Numerical experiments markedly demonstrate that our novel scheme yields significantly better outcomes in image decomposition and denoising than the existing models.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2014, 24, 2; 405-415
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Element partition trees for h-refined meshes to optimize direct solver performance. Part I: Dynamic programming
    Autorzy:
    Aboueisha, H.
    Calo, V. M.
    Jopek, K.
    Moshkov, M.
    Paszyńska, A.
    Paszyński, M.
    Skotniczny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/330823.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    h-adaptive finite element method
    ordering
    element partition tree
    extensions of dynamic programming
    multifrontal direct solvers
    metoda elementów skończonych
    porządkowanie danych
    programowanie dynamiczne
    Opis:
    We consider a class of two- and three-dimensional h-refined meshes generated by an adaptive finite element method. We introduce an element partition tree, which controls the execution of the multi-frontal solver algorithm over these refined grids. We propose and study algorithms with polynomial computational cost for the optimization of these element partition trees. The trees provide an ordering for the elimination of unknowns. The algorithms automatically optimize the element partition trees using extensions of dynamic programming. The construction of the trees by the dynamic programming approach is expensive. These generated trees cannot be used in practice, but rather utilized as a learning tool to propose fast heuristic algorithms. In this first part of our paper we focus on the dynamic programming approach, and draw a sketch of the heuristic algorithm. The second part will be devoted to a more detailed analysis of the heuristic algorithm extended for the case of hp-adaptive grids.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 351-365
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decentralized design of interconnected H infinity feedback control systems with quantized signals
    Autorzy:
    Zhai, G.
    Chen, N.
    Gui, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/331266.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    interconnected systems
    decentralized H infinity control
    dynamic output feedback
    quantizer
    quantization
    matrix inequality
    LMI
    sprzężenie zwrotne dynamiczne
    kwantyzer
    kwantowanie
    nierówność macierzowa
    metoda LMI
    Opis:
    In this paper, we consider the design of interconnected H infinity feedback control systems with quantized signals. We assume that a decentralized dynamic output feedback has been designed for an interconnected continuous-time LTI system so that the closed-loop system is stable and a desired H infinity disturbance attenuation level is achieved, and that the subsystem measurement outputs are quantized before they are passed to the local controllers. We propose a local-output-dependent strategy for updating the parameters of the quantizers, so that the overall closed-loop system is asymptotically stable and achieves the same H infinity disturbance attenuation level. Both the pre-designed controllers and the parameters of the quantizers are constructed in a decentralized manner, depending on local measurement outputs.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2013, 23, 2; 317-325
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalytic oxidation of PAHs in wastewater
    Katalityczne utlenianie WWA w ściekach
    Autorzy:
    Turek, A.
    Włodarczyk-Makuła, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/396729.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    oxidation
    H2O2
    GC-MS
    coking wastewater
    platinum catalyst
    cobalt catalyst
    titanium catalyst
    PAHs
    utlenianie
    ścieki koksownicze
    katalizator platynowy
    katalizator tytanowy
    WWA
    Opis:
    The aim of the investigations was to determine the effectiveness of the removal of 4, 5 -ring PAHs from coking wastewater using dihydrogen dioxide in the presence of a cobalt, platinum or titanium catalyst. A dose 7.4 mL of dihydrogen dioxide in the amount of and 14.8 mL/L of the analyzed sample were added to the samples. The samples were shaken and stored under laboratory conditions for 12 hours. The concentration of PAHs before and after the oxidation process were determined. The quantitative and qualitative chromatographic analysis was carried out using a gas chromatograph coupled with a mass spectrometer (GC-MS). The total concentration of 8 PAHs before oxidation reached the value of 9150 ng/L The concentration of 4-ring compounds and 5-ring PAHs were equal to 6390 ng/L and 2760 ng/L, respectively. The highest decrease (93%) the sum of 8 hydrocarbons using a dose of oxidizer 7.4 ml/L and in the presence of titanium catalyst was achieved.
    Celem badania było określenie skuteczności usuwania 4, 5- pierścieniowych WWA ze ścieków koksowniczych przy użyciu ditlenku diwodoru w obecności katalizatora kobaltowego, platynowego i tytanowego. Do próbki dodawano odpowiednią ilość ditlenku diwodoru i katalizatorów. Dawka utleniacza wynosiła 7,4 ml i 14,8 ml/l. Próbki mieszano i pozostawiono w warunkach laboratoryjnych przez 12 godzin. Po tym czasie oznaczono stężenie WWA. Ilościową i jakościową analizę chromatograficzną przeprowadzono przy użyciu chromatografu gazowego sprzężonego ze spektrometrem masowym. Największy ubytek (93%) sumarycznej ilości ośmiu WWA osiągnięto przy zastosowaniu dawki utleniacza 7,4 ml/l analizowanych ścieków oraz katalizatora tytanowego.
    Źródło:
    Civil and Environmental Engineering Reports; 2016, No. 20(1); 179-190
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Delay-dependent generalized H2 control for discrete T-S fuzzy large-scale stochastic systems with mixed delays
    Autorzy:
    Li, J.
    Xia, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/930162.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system stochastyczny
    opóźnienie zależne
    liniowa nierówność macierzowa
    fuzzy large scale stochastic system
    delay-dependent
    generalized H2 control
    infinite distributed delays
    linear matrix inequality
    Opis:
    This paper is concerned with the problem of stochastic stability and generalized H2 control for discrete-time fuzzy largescale stochastic systems with time-varying and infinite-distributed delays. Large-scale interconnected systems consist of a number of discrete-time interconnected Takagi-Sugeno (T-S) subsystems. First, a novel Delay-Dependent Piecewise Lyapunov-Krasovskii Functional (DDPLKF0 is proposed, in which both the upper and the lower bound of delays are considered. Then, two improved delay-dependent stability conditions are established based on this DDPLKF in terms of Linear Matrix Inequalities (LMIs). The merit of the proposed conditions lies in its reduced conservatism, which is achieved by circumventing the utilization of some bounding inequalities for cross products of two vectors and by considering the interactions among the fuzzy subsystems in each subregion. A decentralized generalized H2 state feedback fuzzy controller is designed for each subsystem. It is shown that the mean-square stability for discrete T-S fuzzy large-scale stochastic systems can be established if a DDPLKF can be constructed and a decentralized controller can be obtained by solving a set of LMIs. Finally, an illustrative example is provided to demonstrate the effectiveness of the proposed method.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 4; 585-603
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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