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Wyszukujesz frazę "time conditions" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    The problem of control of rod heating process with nonseparated conditions at intermediate moments of time
    Autorzy:
    Barseghyan, Vanya R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1845513.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heating control
    temperature
    intermediate moments of time
    nonseparated multipoint conditions
    complete controllability
    Opis:
    The problem of control of rod heating process by changing the temperature along the rod whose ends are thermally insulated is considered. It is assumed that, along with the classical boundary conditions, nonseparated multipoint intermediate conditions are also given. Using the method of separation of variables and methods of the theory of control of finite-dimensional systems with multipoint intermediate conditions, a constructive approach is proposed to build the sought function of temperature control action. A necessary and sufficient condition is obtained, which the function of the distribution of the rod temperature must satisfy, so that under any feasible initial, nonseparated intermediate, and final conditions, the problem is completely controllable. As an application of the proposed approach, control action with given nonseparated conditions on the values of the rod temperature distribution function at the two intermediate moments of time is constructed.
    Źródło:
    Archives of Control Sciences; 2021, 31, 3; 481-493
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The problem of control of rod heating process with nonseparated conditions at intermediate moments of time
    Autorzy:
    Barseghyan, Vanya R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1845524.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heating control
    temperature
    intermediate moments of time
    nonseparated multipoint conditions
    complete controllability
    Opis:
    The problem of control of rod heating process by changing the temperature along the rod whose ends are thermally insulated is considered. It is assumed that, along with the classical boundary conditions, nonseparated multipoint intermediate conditions are also given. Using the method of separation of variables and methods of the theory of control of finite-dimensional systems with multipoint intermediate conditions, a constructive approach is proposed to build the sought function of temperature control action. A necessary and sufficient condition is obtained, which the function of the distribution of the rod temperature must satisfy, so that under any feasible initial, nonseparated intermediate, and final conditions, the problem is completely controllable. As an application of the proposed approach, control action with given nonseparated conditions on the values of the rod temperature distribution function at the two intermediate moments of time is constructed.
    Źródło:
    Archives of Control Sciences; 2021, 31, 3; 481-493
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability analysis for discrete-time fractional-order LTI state-space systems. Part I: New necessary and sufficient conditions for the asymptotic stability
    Autorzy:
    Stanisławski, R.
    Latawiec, K. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200600.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Grünwald-Letnikov fractional difference
    discrete-time fractional order system
    stability conditions
    Cauchy’s argument principle
    Opis:
    This paper presents a series of new results on the asymptotic stability of discrete-time fractional difference (FD) state space systems and their finite-memory approximations called finite FD (FFD) and normalized FFD (NFFD) systems. In Part I, new, general, necessary and sufficient stability conditions are introduced in a unified form for FD/FFD/NFFD-based systems. In Part II, an original, simple, analytical stability criterion is offered for FD-based systems, and the result is used to develop simple, efficient, numerical procedures for testing the asymptotic stability for FFD-based and, in particular, NFFD-based systems. Consequently, the so-called f-poles and f-zeros are introduced for FD-based system and their closed-loop stability implications are discussed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 353-361
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controllability of time varying semilinear non-instantaneous impulsive systems with delay, and nonlocal conditions
    Autorzy:
    Cabada, Dalia
    Garcia, Katherine
    Guevara, Cristi
    Leiva, Hugo
    Powiązania:
    https://bibliotekanauki.pl/articles/2134894.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    exact controllability
    semilinear time varying control systems
    non-instantaneous impulses
    delay
    nonlocal conditions
    Rothe's fixed point theorem
    Opis:
    In this paper we prove the exact controllability of a time varying semilinear system considering non-instantaneous impulses, delay, and nonlocal conditions occurring simultaneously. It is done by using the Rothe’s fixed point theorem together with some sub-linear conditions on the nonlinear term, the impulsive functions, and the function describing the nonlocal conditions. Furthermore, a control steering the semilinear system from an initial state to a final state is exhibited.
    Źródło:
    Archives of Control Sciences; 2022, 32, 2; 335--357
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of dynamic error in measurements of transient fluid temperature
    Autorzy:
    Jaremkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240052.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analiza niepewności
    model pierwszego obiektu
    pomiar temperatury
    stała czasowa
    warunki przejściowe
    first-order model
    temperature measurement
    time constant
    transient conditions
    uncertainty analysis
    Opis:
    Under steady-state conditions when fluid temperature is constant, temperature measurement can be accomplished with high degree of accuracy owing to the absence of damping and time lag. However, when fluid temperature varies rapidly, for example, during start-up, appreciable differences occur between the actual and measured fluid temperature. These differences occur because it takes time for heat to transfer through the heavy thermometer pocket to the thermocouple. In this paper, a method for determinig transient fluid temperature based on the first-order thermometer model is presented. Fluid temperature is determined using a thermometer, which is suddenly immersed into boiling water. Next, the time constant is defined as a function of fluid velocity for four sheated thermocouples with different diameters. To demonstrate the applicability of the presented method to actual data where air velocity varies, the temperature of air is estimated based on measurements carried out by three thermocouples with different outer diameters. Lastly, the time constant is presented as a function of fluid velocity and outer diameter of thermocouple.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 4; 55-66
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    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
      Wyświetlanie 1-6 z 6

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