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    Wyświetlanie 1-19 z 19
    Tytuł:
    Experimental and finite element analysis of PPF controller effectiveness in composite beam vibration suppression
    Autorzy:
    Mitura, Andrzej
    Gawryluk, Jaroslaw
    Powiązania:
    https://bibliotekanauki.pl/articles/2172029.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    finite element method
    positive position feedback control
    composite structures
    hysteresis
    phenomenon
    macro-fiber composite
    Opis:
    In this paper the problem of vibration reduction is considered. Generally, mechanical vibrations occurring during the operation of a system are undesirable and may have a negative effect on its reliability. A finite element model of a single active blade is developed using the Abaqus software. This structure consists of a multi-layer glass-epoxy composite beam with an embedded macro fiber composite (MFC) piezoelectric actuator. For vibration control the use of a positive position feedback (PPF) controller is proposed. To include the PPF controller in the Abaqus software, a special subroutine is created. The developed control algorithm code makes it possible to solve an additional differential equation by the fourth order RungeKutta method. A numerical dynamic analysis is performed by the implicit procedure. The beam responses with and without controller activation are compared. The control subsystem model also includes the hysteresis phenomenon of the piezoelectric actuator. Numerical findings regarding the PPF controller’s effectiveness are verified experimentally.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 3; 468--477
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Loop Gain of the Common-Drain Colpitts Oscillator
    Autorzy:
    Kazimierczuk, M. K.
    Murthy-Bellur, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/226711.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    band-pass feedback networks
    Colpitts oscillator
    common-drain amplifier
    location of poles
    loop gain
    oscillation conditions
    positive feedback
    resonant oscillators
    tuned oscillators
    voltage-controlled oscillators (VCO)
    Opis:
    This paper presents the derivations of the voltage transfer functions of the amplifier A, the feedback network β, and the loop gain Τ of the common-drain (CD) Colpitts oscillator, using the small-signal model of the CD Colpitts oscillator. The derivation of the characteristic equation of the CD Colpitts oscillator is presented. Using the characteristic equation, the equation for the oscillation frequency of the sinusoidal output voltage and the condition for steady-state oscillation are derived. The characteristic equation is used to obtain a plot of trajectories of the poles of the CD Colpitts oscillator by varying the MOSFET small-signal transconductance gm. The locations of the complex conjugate poles depicting starting and steady-state conditions for oscillations are also presented.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 4; 423-426
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline as a new psychological method of development support in Poland
    Autorzy:
    Wójtowicz-Dacka, Małgorzata
    Miotk-Mrozowska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/430676.pdf
    Data publikacji:
    2016-09-01
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    development support
    video-feedback interventions
    Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline
    VIPP-SD
    Opis:
    This article will introduce a new method that has been available in Poland since 2015, based on video recordings, for families with children up to 5 years of age - the Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline (VIPP-SD) (Juffer, Bakermans-Kranenburg, van IJzendoorn, 2008). The authors first discuss the current framework of development support psychology in Poland. Next, there is a review of methods based on video training. General information about the VIPP-SD intervention program is presented in the following part of the paper, focusing on international evidence-based studies supporting the effectiveness of the method. The need for a cultural adaptation and implementation of the VIPP-SD program in Poland is outlined.
    Źródło:
    Polish Psychological Bulletin; 2016, 47, 3; 250-257
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global stability of discrete-time nonlinear systems with descriptor standard and fractional positive linear parts and scalar feedbacks
    Autorzy:
    Kaczorek, T.
    Ruszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403681.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stability
    fractional
    positive
    nonlinear
    discrete-time
    feedback
    system
    Opis:
    The global stability of discrete-time nonlinear systems with descriptor positive linear parts and positive scalar feedbacks is addressed. Sufficient conditions for the global stability of standard and fractional nonlinear systems are established. The effectiveness of these conditions is illustrated on numerical examples.
    Źródło:
    Archives of Control Sciences; 2020, 30, 4; 667-681
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilization of fractional positive continuous-time linear systems with delays in sectors of left half complex plane by state-feedbacks
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/969916.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    fractional
    positive
    continuous-time
    linear
    system
    state-feedback
    stabilization
    Opis:
    The problem of stabilization of fractional positive linear continuous-time linear systems with delays by state-feedbacks is addressed. The gain matrix of the state feedback is chosen so that the zeros of the closed-loop polynomial are located in a sector of the left half of complex plane. Necessary and sufficient conditions for the solvability of the problem are established and a procedure for computation of a gain matrix of the feedback is proposed. The considerations are illustrated by a numerical example.
    Źródło:
    Control and Cybernetics; 2010, 39, 3; 783-795
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global stability of positive discrete-time time-varying nonlinear feedback systems
    Autorzy:
    Kaczorek, Tadeusz
    Sajewski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2058440.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Technologiczno-Humanistyczny im. Kazimierza Pułaskiego w Radomiu
    Tematy:
    global stability
    discrete-time
    positive
    feedback
    time-varying
    nonlinear system
    Opis:
    The global stability of positive discrete-time time-varying nonlinear systems with time-varying scalar feedbacks is investigated. Sufficient conditions for the asymptotic stability of discrete-time positive time-varying linear systems are given. The new conditions are applied to discrete-time positive time-varying nonlinear systems with time-varying feedbacks. Sufficient conditions are established for the global stability of the discrete-time positive time-varying nonlinear systems with feedbacks.
    Źródło:
    Journal of Automation, Electronics and Electrical Engineering; 2021, 3, 1; 17--20
    2658-2058
    2719-2954
    Pojawia się w:
    Journal of Automation, Electronics and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Poles and zeros assignment by state feedbacks in positive linear systems
    Autorzy:
    Kaczorek, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1845519.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    assignment
    pole
    zero
    transfer matrix
    linear
    positive
    system
    state feedback
    Opis:
    Poles and zeros assignment problem by state feedbacks in positive continuous-time and discrete-time systems is analyzed. It is shown that in multi-input multi-output positive linear systems by state feedbacks the poles and zeros of the transfer matrices can be assigned in the desired positions. In the positive continuous-time linear systems the feedback gain matrix can be chosen as a monomial matrix so that the poles and zeros of the transfer matrices have the desired values if the input matrix B is monomial. In the positive discrete-time linear systems to solve the problem the matrix B can be chosen monomial if and only if in every row and every column of the n × n system matrix A the sum of n−1 its entries is less than one.
    Źródło:
    Archives of Control Sciences; 2021, 31, 3; 593-605
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Poles and zeros assignment by state feedbacks in positive linear systems
    Autorzy:
    Kaczorek, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1845533.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    assignment
    pole
    zero
    transfer matrix
    linear
    positive
    system
    state feedback
    Opis:
    Poles and zeros assignment problem by state feedbacks in positive continuous-time and discrete-time systems is analyzed. It is shown that in multi-input multi-output positive linear systems by state feedbacks the poles and zeros of the transfer matrices can be assigned in the desired positions. In the positive continuous-time linear systems the feedback gain matrix can be chosen as a monomial matrix so that the poles and zeros of the transfer matrices have the desired values if the input matrix B is monomial. In the positive discrete-time linear systems to solve the problem the matrix B can be chosen monomial if and only if in every row and every column of the n × n system matrix A the sum of n−1 its entries is less than one.
    Źródło:
    Archives of Control Sciences; 2021, 31, 3; 593-605
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilization of discrete-time LTI positive systems
    Autorzy:
    Krokavec, D.
    Filasová, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/229466.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    state feedback stabilization
    positive discrete-time observers
    linear discrete-time positive systems
    linear matrix inequalities
    asymptotic stability
    Opis:
    The paper mitigates the existing conditions reported in the previous literature for control design of discrete-time linear positive systems. Incorporating an associated structure of linear matrix inequalities, combined with the Lyapunov inequality guaranteing asymptotic stability of discrete-time positive system structures, new conditions are presented with which the state-feedback controllers and the system state observers can be designed. Associated solutions of the proposed design conditions are illustrated by numerical illustrative examples.
    Źródło:
    Archives of Control Sciences; 2017, 27, 4; 575-594
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exponential decay of transient values in discrete-time positive nonlinear systems
    Autorzy:
    Kaczorek, Tadeusz
    Ruszewski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2175100.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    exponential decay
    transient value
    discrete-time
    fractional order
    positive
    nonlinear
    feedback
    system
    Opis:
    The exponential decay of transient values in discrete-time nonlinear standard and fractional orders systems with linear positive linear part and positive feedbacks is investigated. Sufficient conditions for the exponential decay of transient values in this class of positive nonlinear systems are established. A procedure for computation of gains characterizing the class of nonlinear elements are given and illustrated on simple example.
    Źródło:
    Archives of Control Sciences; 2022, 32, 3; 577--588
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superstabilization of positive linear electrical circuit by state-feedbacks
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/201246.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    positive
    electrical circuit
    superstability
    state-feedback
    pozytywny
    obwód elektryczny
    superstabilność
    informacja zwrotna
    Opis:
    The concept of superstability of positive linear electrical circuits is introduced and its properties are characterized. The superstabilization of positive and nonpositive electrical circuits by state-feedbacks is analyzed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 703-708
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suboptimal control of nonlinear continuous-time locally positive systems using input-state linearization and SDRE approach
    Autorzy:
    Bernat, J.
    Kołota, J.
    Stępień, S.
    Superczyńska, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200111.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    positive nonlinear systems
    feedback control
    Riccati equation
    sprzężenie zwrotne
    układy nieliniowe
    równanie Riccatiego
    Opis:
    The infinite time suboptimal control problem for continuous-time nonlinear positive systems is formulated and solved. A solution to the problem using input-state linearization and state-dependent Riccati equation method (SDRE) is established, a procedure for solving the problem is proposed and illustrated with a numerical example.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 17-21
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global stability of nonlinear feedback systemswith positive descriptor linear parts
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/200005.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    global stability
    positive descriptor
    nonlinear
    feedback system
    globalna stabilność
    nieliniowość
    system informacji zwrotnej
    Opis:
    The global (absolute) stability of nonlinear systems with negative feedbacks and positive descriptor linear parts is addressed. Transfer matrices of positive descriptor linear systems are analyzed. The characteristics u = f (e) of the nonlinear parts satisfy the condition k1e ≤ f (e) ≤ k2e for some positive k1, k2. It is shown that the nonlinear feedback systems are globally asymptotically stable if the Nyquist plots of the positive descriptor linear parts are located in the right-hand side of the circles (– 1/k1, – 1/k2).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 45-51
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reachability and controllability of 2D positive linear systems with state feedbacks
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/205758.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sterowalność
    teoria sterowania
    układ liniowy
    controllability
    positive 2D Roesser model
    reachability
    state-feedback
    Opis:
    It is shown that the reachability and controllability of positive 2D linear systems are not invariant under the state-feedbacks. By suitable choice of the state-feedbacks the unreachable positive 2D Roesser model can be made reachable and the controllable positive 2D Roesser model can be made uncontrollable.
    Źródło:
    Control and Cybernetics; 2000, 29, 1; 141-151
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positivity and linearization of a class of nonlinear continuous-time systems by state feedbacks
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/329778.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    positive
    nonlinear
    continuous-time system
    linearization
    state feedback
    układ dodatni
    układ ciągły
    sprzężenie zwrotne
    Opis:
    The positivity and linearization of a class of nonlinear continuous-time system by nonlinear state feedbacks are addressed. Necessary and sufficient conditions for the positivity of the class of nonlinear systems are established. A method for linearization of nonlinear systems by nonlinear state feedbacks is presented. It is shown that by a suitable choice of the state feedback it is possible to obtain an asymptotically stable and controllable linear system, and if the closed-loop system is positive then it is unstable.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 4; 827-831
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global stability of nonlinear feedback systems with fractional positive linear parts
    Autorzy:
    Kaczorek, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/330048.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    global stability
    fractional positive system
    nonlinear system
    feedback system
    stateczność globalna
    układ ułamkowy
    układ dodatni
    układ nieliniowy
    Opis:
    The global (absolute) stability of nonlinear systems with fractional positive and not necessarily asymptotically stable linear parts and feedbacks is addressed. The characteristics u = f(e) of the nonlinear parts satisfy the condition k1e ≤ f(e) ≤ k2e for some positive k1 and k2. It is shown that the fractional nonlinear systems are globally asymptotically stable if the Nyquist plots of the fractional positive linear parts are located on the right-hand side of the circles (−1/k1,−1/k2).
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2020, 30, 3; 493-499
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline (VIPP-SD) w pracy terapeutycznej z rodzicami dzieci z grupy ryzyka rozwojowego
    The Method of Video-feedback Intervention to Promote Positive Parenting and Sensitive Discipline (VIPP-SD) in Therapeutic Work with Parents of Children in the Development Risk Group
    Autorzy:
    Kopeć, Danuta
    Kubiak, Hanna
    Powiązania:
    https://bibliotekanauki.pl/articles/15838130.pdf
    Data publikacji:
    2020-12-29
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline (VIP-P-SD)
    attachment theory
    parental sensitivit
    coercion theory
    development risk of children
    mental disorders of children
    mental disorders of parents
    Opis:
    Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline (VIPP-SD) is a therapeutic intervention based on video-feedback which aims to support positive parenting and sensitive parental discipline. It is a part of evidence-based therapeutic interventions, which means that the effectiveness of the training has been confirmedin rigorously planned and carried out studies of both the general population and various clinical groups. The theoretical framework for VIPP-SD is attachment theory and coercion theory. The basic principle of intervention is referring to family resources in the therapeutic work, primarily in situations in which the correct course of a child’s development can be disturbed by both biological and environmental factors. The article presents the aspects of the application of VIPP-SD in the following clinical groups: families with children at risk of improper development, families in which the functioning of parents creates the development risk for children, and the family environment as a risk factor for children’s development.
    Źródło:
    Studia Edukacyjne; 2018, 49; 315-333
    1233-6688
    Pojawia się w:
    Studia Edukacyjne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical circuits with state-feedbacks and desired dynamical properties
    Obwody elektryczne ze sprzężeniami zwrotnymi od wektora stanu o pożądanych właściwościach dynamicznych
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/157119.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    dodatni
    liniowy
    elektryczny
    obwód
    sprzężenie zwrotne od stanu
    macierz wzmocnień
    positive
    linear
    electrical
    circuit
    state-feedback
    gain matrix
    dynamical property
    Opis:
    Linear electrical circuits composed of resistors, inductances, capacitances and voltage (current) sources with state-feedbacks are addressed. It is shown that for large class of nonpositive electrical circuits it is possible to choose gain matrices of the state-feedbacks so that the closed-loop systems are positive and have some desired dynamical properties. Sufficient conditions for nonnegativity of B matrices of linear electrical circuits are established. Considerations are illustrated by three examples of linear electrical circuits.
    W pracy są rozpatrywane liniowe obwody elektryczne złożone z rezystancji, pojemności, indukcyjności i źródeł napięcia (prądu). Wykazano, że dla szerokiej klasy niedodatnich obwodów elektrycznych można dobrać macierz wzmocnień statycznych sprzężeń zwrotnych od wektora stanu tak, aby układ zamknięty był dodatni i miał pożądane właściwości dynamiczne. Podano warunki wystarczające nieujemności elementów macierzy B liniowych obwodów elektrycznych. Rozważania ogólne zostały zilustrowane przykładami obwodów elektrycznych.
    Źródło:
    Pomiary Automatyka Kontrola; 2010, R. 56, nr 5, 5; 371-376
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remarks on stability of positive linear systems
    Autorzy:
    Mitkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/205542.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    algebra macierzy
    dyskretny system sterowania
    liniowy system sterowania
    stabilność
    teoria sterowania
    asymptotic stability
    continous time system
    discrete-time system
    feedback
    matrix algebra
    nonnegative matrices
    positive linear systems
    RC circuits
    Opis:
    Spectral properties of nonegative matrices are considered. Asymptotic stability and stabilisation problems of positive discrete-time and continous-time linear systems by feedbacks are discussed. The electric RC-networks are presented as examples of positive systems. Numerical calculations were made using the MATLAB program.
    Źródło:
    Control and Cybernetics; 2000, 29, 1; 295-304
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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