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    Wyświetlanie 1-13 z 13
    Tytuł:
    Parameters Identification of Material Models Based on the Inverse Analysis
    Autorzy:
    Szeliga, D.
    Gawąd, J.
    Pietrzyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/907967.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza odwrotna
    przemiana fazowa
    zmienna wewnętrzna
    inverse analysis
    phase transformation
    internal variable model
    Opis:
    The paper presents an application of the inverse analysis to the identification of two models: a phase transformation model and a rheological model. The optimization algorithm for the inverse analysis was tested for various techniques of searching for the minimum: derivative-free and gradient methods, as well as genetic algorithms. Simulation results were validated for microalloyed niobium steel. An optimization strategy, which is adequate for the inverse analysis, is suggested.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2004, 14, 4; 549-556
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Context-Based Approach to Linguistic Hedges
    Autorzy:
    De Cock, M.
    Kerre, E. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/908039.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    informatyka
    L-fuzzy modifier
    L-fuzzy relation
    resemblance relation
    linguistic hedge
    linguistic variable
    Opis:
    We present a framework of L-fuzzy modifiers for L being a complete lattice. They are used to model linguistic hedges that act on linguistic terms represented by L-fuzzy sets. In the modelling process the context is taken into account by means of L-fuzzy relations, endowing the L-fuzzy modifiers with a clear inherent semantics. To our knowledge, these L-fuzzy modifiers are the first ones proposed that are suitable to perform this representation task for a lattice L different from the unit interval. In the latter case they undoubtedly outperform the traditional representations, such as powering and shifting hedges, from the semantical point of view.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2002, 12, 3; 371-382
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable structure observer design for a class of uncertain systems with a time-varying delay
    Autorzy:
    Liu W., J.
    Powiązania:
    https://bibliotekanauki.pl/articles/330119.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    obserwator
    niezmienniczość
    uogólniona odwrotność macierzy
    variable structure observer
    invariance property
    generalized matrix inverse approach
    Opis:
    Design of a state observer is an important issue in control systems and signal processing. It is well known that it is difficult to obtain the desired properties of state feedback control if some or all of the system states cannot be directly measured. Moreover, the existence of a lumped perturbation and/or a time delay usually reduces the system performance or even produces an instability in the closed-loop system. Therefore, in this paper, a new Variable Structure Observer (VSO) is proposed for a class of uncertain systems subjected to a time varying delay and a lumped perturbation. Based on the strictly positive real concept, the stability of the equivalent error system is verified. Based on the generalized matrix inverse approach, the global reaching condition of the sliding mode of the error system is guaranteed. Also, the proposed variable structure observer will be shown to possess the invariance property in relation to the lumped perturbation, as the traditional variable structure controller does. Furthermore, two illustrative examples with a series of computer simulation studies are given to demonstrate the effectiveness of the proposed design method.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 575-583
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Random perturbation of the variable metric method for unconstrained nonsmooth nonconvex optimization
    Autorzy:
    El Mouatasim, A.
    Ellaia, R.
    Souza de Cursi, J. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/908374.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    optymalizacja
    zaburzenie stochastyczne
    zaburzenie losowe
    nonconvex optimization
    stochastic perturbation
    variable metric method
    nonsmooth optimization
    generalized gradient
    Opis:
    We consider the global optimization of a nonsmooth (nondifferentiable) nonconvex real function. We introduce a variable metric descent method adapted to nonsmooth situations, which is modified by the incorporation of suitable random perturbations. Convergence to a global minimum is established and a simple method for the generation of suitable perturbations is introduced. An algorithm is proposed and numerical results are presented, showing that the method is computationally effective and stable.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2006, 16, 4; 463-474
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Random perturbation of the projected variable metric method for nonsmooth nonconvex optimization problems with linear constraints
    Autorzy:
    El Mouatasim, A.
    Ellaia, R.
    Souza de Cursi, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/907785.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    optymalizacja globalna
    ograniczenie liniowe
    zaburzenie stochastyczne
    global optimization
    linear constraints
    variable metric method
    stochastic perturbation
    nonsmooth optimization
    Opis:
    We present a random perturbation of the projected variable metric method for solving linearly constrained nonsmooth (i.e., nondifferentiable) nonconvex optimization problems, and we establish the convergence to a global minimum for a locally Lipschitz continuous objective function which may be nondifferentiable on a countable set of points. Numerical results show the effectiveness of the proposed approach.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 2; 317-329
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the computation of the GCD of 2-D polynomials
    Autorzy:
    Tzekis, P.
    Karampetakis, N. P.
    Terzidis, H. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/929803.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    największy wspólny dzielnik
    dyskretne przekształcenie Fouriera
    wielomian dwuzmienny
    greatest common divisor
    discrete Fourier transform
    two-variable polynomial
    Opis:
    The main contribution of this work is to provide an algorithm for the computation of the GCD of 2-D polynomials, based on DFT techniques. The whole theory is implemented via illustrative examples.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 4; 463-470
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable-structure repetitive control for discrete-time linear systems with multiple-period exogenous signals
    Autorzy:
    Kurniawan, Edi
    Harno, Hendra G.
    Wijonarko, Sensus
    Widiyatmoko, Bambang
    Bayuwati, Dwi
    Purwowibowo, Purwowibowo
    Maftukhah, Tatik
    Powiązania:
    https://bibliotekanauki.pl/articles/330684.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    repetitive control
    variable structure control
    multiple period signal
    fast transient response
    sterowanie powtarzalne
    sterowanie o zmiennej strukturze
    odpowiedź przejściowa
    Opis:
    A new method to construct a discrete-time variable-structure repetitive controller for a class of linear systems perturbed by multiple-period exogenous signals is presented. The proposed control scheme combines the features of the discrete-time multiple-period repetitive control (MP-RC) and variable-structure control (VSC) techniques. The MP-RC part is assigned to simultaneously track and reject periodic signals consisting of multiple uncorrelated fundamental frequencies. The VSC part is then integrated to provide a fast transient response and robustness against plant parameter variations. Stability and robustness analyses are also elaborated to ensure that the resulting closed-loop system satisfies the desired control objectives. Moreover, it is shown through an example that the repetitive control system constructed using the proposed control method can effectively track a sinusoidal reference signal despite the presence of a multiple-period disturbance.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2020, 30, 2; 207-218
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A variable structure observer for the control of robot manipulators
    Autorzy:
    Abdessameud, A.
    Khelfi, M. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/908406.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    obserwator
    manipulator robotyczny
    stateczność wykładnicza
    system naprowadzający
    variable structure observers
    switching-type observers
    rigid robot manipulators
    exponential stability
    tracking control
    Opis:
    This paper deals with the application of a variable structure observer developed for a class of nonlinear systems to solve the trajectory tracking problem for rigid robot manipulators. The analyzed approach to observer design proposes a simple design methodology for systems having completely observable linear parts and bounded nonlinearities and/or uncertainties. This observer is basically the conventional Luenberger observer with an additional switching term that is used to guarantee robustness against modeling errors and system uncertainties. To solve the tracking problem, we use a control law developed for robot manipulators in the full information case. The closed loop system is shown to be globally asymptotically stable based on Lyapunov arguments. Simulation results on a 3-DOF robot manipulator show the asymptotic convergence of the vectors of observation and tracking errors.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2006, 16, 2; 189-196
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time-optimal control of linear fractional systems with variable coefficients
    Autorzy:
    Matychyn, Ivan
    Onyshchenko, Viktoriia
    Powiązania:
    https://bibliotekanauki.pl/articles/2055161.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fractional calculus
    Riemann-Liouville derivative
    variable coefficients
    optimal control
    rachunek ułamkowy
    pochodna ułamkowa Riemanna-Liouville'a
    współczynnik zmienny
    sterowanie optymalne
    Opis:
    Linear systems described by fractional differential equations (FDEs) with variable coefficients involving Riemann–Liouville and Caputo derivatives are examined in the paper. For these systems, a solution of the initial-value problem is derived in terms of the generalized Peano–Baker series and a time-optimal control problem is formulated. The optimal control problem is treated from the convex-analytical viewpoint. Necessary and sufficient conditions for time-optimal control similar to that of Pontryagin’s maximum principle are obtained. Theoretical results are supported by examples.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 3; 375--386
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault detection and isolation with robust principal component analysis
    Autorzy:
    Tharrault, Y.
    Mourot, G.
    Ragot, J.
    Maquin, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/929927.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza głównych składowych
    odporność
    detekcja uszkodzeń
    lokalizacja uszkodzeń
    principal component analysis
    robustness
    outliers
    fault detection
    fault isolation
    structured residual vector
    variable reconstruction
    Opis:
    Principal component analysis (PCA) is a powerful fault detection and isolation method. However, the classical PCA, which is based on the estimation of the sample mean and covariance matrix of the data, is very sensitive to outliers in the training data set. Usually robust principal component analysis is applied to remove the effect of outliers on the PCA model. In this paper, a fast two-step algorithm is proposed. First, the objective was to find an accurate estimate of the covariance matrix of the data so that a PCA model might be developed that could then be used for fault detection and isolation. A very simple estimate derived from a one-step weighted variance-covariance estimate is used (Ruiz-Gazen, 1996). This is a 'local' matrix of variance which tends to emphasize the contribution of close observations in comparison with distant observations (outliers). Second, structured residuals are used for multiple fault detection and isolation. These structured residuals are based on the reconstruction principle, and the existence condition of such residuals is used to determine the detectable faults and the isolable faults. The proposed scheme avoids the combinatorial explosion of faulty scenarios related to multiple faults to be considered. Then, this procedure for outliers detection and isolation is successfully applied to an example with multiple faults.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 4; 429-442
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On-line parameter and delay estimation of continuous-time dynamic systems
    Autorzy:
    Kozłowski, J.
    Kowalczuk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/330669.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    delay system
    continuous time model
    discrete approximation
    parameter estimation
    least squares estimator
    instrumental variable estimator
    układ z opóźnieniem
    aproksymacja dyskretna
    estymacja parametrów
    zmienna instrumentalna
    Opis:
    The problem of on-line identification of non-stationary delay systems is considered. The dynamics of supervised industrial processes are usually modeled by ordinary differential equations. Discrete-time mechanizations of continuous-time process models are implemented with the use of dedicated finite-horizon integrating filters. Least-squares and instrumental variable procedures mechanized in recursive forms are applied for simultaneous identification of input delay and spectral parameters of the system models. The performance of the proposed estimation algorithms is verified in an illustrative numerical simulation study.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 2; 223-232
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel method for the design of switching surfaces for discretized MIMO nonlinear systems
    Autorzy:
    Luis-Delgado, J. D.
    Al-Hadithi, B. M.
    Jiménez, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331143.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    discrete sliding mode
    variable structure control
    nonlinear control
    optimal control
    MIMO system
    sterowanie dyskretne
    sterowanie ślizgowe
    sterowanie o zmiennej strukturze
    sterowanie nieliniowe
    sterowanie optymalne
    system MIMO
    Opis:
    Designing variable structure control with sliding mode (VSC-SM) control schemes needs a switching function or a sliding surface which guarantees the global stability of the closed-loop system. Despite the fact that a wide range of design approaches has been proposed for solving this mathematical problem, the number of proposed methodologies for nonlinear systems is not very extensive, especially for discrete time nonlinear MIMO systems, and most of them require some coordinate system transformation. Therefore, it is not an easy task to find a design scheme that can be applied to discrete time nonlinear MIMO systems. The proposed methodology introduces a mathematical tool: a switching surface equation for a class of MIMO nonlinear systems through an explicit equation without any coordinate transformation. This equation makes use of an implicit linearizing process via the Taylor expansion that allows the use of linear procedures for the design of switching surfaces and the forward Euler method to obtain a discrete time dynamics representation. An illustrative example is included to show the advantages of the proposed design methodology.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 1; 5-17
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A relation of dominance for the bicriterion bus routing problem
    Autorzy:
    Widuch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/330092.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    multicriteria optimization
    set of nondominated solutions
    bicriterion shortest path problem
    variable weights
    label correcting algorithm
    transportation problem
    optymalizacja wielokryterialna
    zbiór rozwiązań niezdominowanych
    dwukryterialny problem najkrótszej ścieżki
    zmienne wagi
    problem transportowy
    Opis:
    A bicriterion bus routing (BBR) problem is described and analysed. The objective is to find a route from the start stop to the final stop minimizing the time and the cost of travel simultaneously. Additionally, the time of starting travel at the start stop is given. The BBR problem can be resolved using methods of graph theory. It comes down to resolving a bicriterion shortest path (BSP) problem in a multigraph with variable weights. In the paper, differences between the problem with constant weights and that with variable weights are described and analysed, with particular emphasis on properties satisfied only for the problem with variable weights and the description of the influence of dominated partial solutions on non-dominated final solutions. This paper proposes methods of estimation a dominated partial solution for the possibility of obtaining a non-dominated final solution from it. An algorithm for solving the BBR problem implementing these estimation methods is proposed and the results of experimental tests are presented.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 1; 133-155
    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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