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    Wyświetlanie 1-14 z 14
    Tytuł:
    Exact null controllability, complete stabilizability and continuous final observability of neutral type systems
    Autorzy:
    Rabah, R.
    Sklyar, G.
    Barkhayev, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/329801.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    exact null controllability
    complete stabilizability
    final observability
    neutral type system
    Opis:
    For abstract linear systems in Hilbert spaces we revisit the problems of exact controllability and complete stabilizability (stabilizability with an arbitrary decay rate), the latter property being related to exact null controllability. We also consider the case when the feedback is not bounded. We obtain a characterization of complete stabilizability for neutral type systems. Conditions for exact null controllability of neutral type systems are discussed. By duality, we obtain a result about continuous final observability. Illustrative examples are given.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 3; 489-499
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the neutral grounding modes influence on the reliability characteristics of local systems with renewable energy sources
    Autorzy:
    Ostapchuk, Oleksandr
    Kuznetsov, Valeriy
    Kruczek, Włodzimierz
    Kuznetsov, Vitaliy
    Tsyplenkov, Dmytro
    Powiązania:
    https://bibliotekanauki.pl/articles/1840882.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    electric networks
    protection
    reliability
    ground failure current
    electrical safety
    system with isolated neutral
    system with resonant grounding
    system with low-impedance neutral grounding
    sieć elektryczna
    ochrona
    niezawodność
    bezpieczeństwo
    Opis:
    When comparing the performance indicators of electrical networks with different types of neutral grounding, along with the fulfilment of the requirement to ensure reliability of power supply to consumers, serious attention is drawn to the main network parameters influencing the performance of power supply systems. Analysis of research and its results, reported above, on the influence of the neutral ground of power networks on the reliability and electrical safety conditions of the power supply systems as a whole, on the damage of distribution networks and electrical equipment as well as on the working capacity of relay protection devices, provides an opportunity to estimate each specific operation mode of the neutral and to develop recommendations aimed at strengthening the positive indicators of the corresponding modes. Other things being equal, reliability of power supply to electrical receivers or reliability of distribution networks is mainly determined by the damage to network elements and the performance of relay protection devices. The degree of influence of these factors on the reliability of distribution networks depends on the neutral mode, which in turn determines the level of internal overvoltages and the nature of transient processes at earth fault.
    Źródło:
    Diagnostyka; 2021, 22, 1; 45-56
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems and counter measures of arc suppression coilin 10 kV distribution system
    Autorzy:
    Ni, Hui
    Ding, Pei
    Ma, Yunlong
    Ai, Shaogui
    Ma, Feiyue
    Zhang, Qingping
    Powiązania:
    https://bibliotekanauki.pl/articles/141485.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arc suppression coil
    capacitive current
    artificial grounding fault test
    neutral non-effective grounding system
    Opis:
    The arc suppression coil determines whether it can effectively extinguish the arc when it is grounded in the neutral non-effective grounding system. An artificial grounding test is an importantway to verify its performance. In this study, 13 substations with the 10 kV system in the Ningxia areawere selected and considered. Based on the artificial single-phase grounding test, the residual current, the compensation current and the off-resonance degree were measured in the arc suppression coil, and the performance of the arc suppression coil in the 10 kV system was verified. The experimental results show that the error of arc suppression coil automatic measurement is large, the off-resonance degree is large, the resistive component in the compensation current is excessive, the harmonic component exists in the compensating current and capacitive current. To solve these problems, this paper puts forward the corresponding countermeasures for reference.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 1; 135-146
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On some topological methods in theory of neutral type operator differential inclusions with applications to control systems
    Autorzy:
    Kamenskii, Mikhail
    Obukhovskii, Valeri
    Yao, Jen-Chih
    Powiązania:
    https://bibliotekanauki.pl/articles/729536.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    operator differential inclusion
    neutral type
    periodic solution
    fixed point
    multivalued map
    condensing map
    topological degree
    averaging method
    control system
    distributed control
    Opis:
    We consider a neutral type operator differential inclusion and apply the topological degree theory for condensing multivalued maps to justify the question of existence of its periodic solution. By using the averaging method, we apply the abstract result to an inclusion with a small parameter. As example, we consider a delay control system with the distributed control.
    Źródło:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2013, 33, 2; 193-204
    1509-9407
    Pojawia się w:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Delay-Dependent Stability for Neutral Delay-Differential Systems
    Autorzy:
    Han, Q. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/908069.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    opóźnienie czasowe
    opóźnienie zależne
    stability
    time delay
    neutral system
    linear matrix inequality (LMI)
    Opis:
    This paper deals with the stability problem for a class of linear neutral delay-differential systems. The time delay is assumed constant and known. Delay-dependent criteria are derived. The criteria are given in the form of linear matrix inequalities which are easy to use when checking the stability of the systems considered. Numerical examples indicate significant improvements over some existing results.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2001, 11, 4; 965-976
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Laboratory Ageing on the Preservation of Anti-graffiti Properties for Paint Systems Used in Rolling Stock
    Autorzy:
    Garbacz, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/2116440.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Kolejnictwa
    Tematy:
    ageing tests
    xenon-arc radiation
    UV-C radiation
    neutral salt spray
    paint system
    xenotest
    gloss
    colour
    antigraffiti protection
    rolling stock
    Opis:
    The article describes and presents the influence of selected ageing mechanisms of paint systems currently used in railways in Poland in the context of maintaining their original protective properties against graffiti. Six paint systems with different types of finish, which had anti-graffiti properties, were tested, and the characteristics of the surface of the paint system, such as gloss and colour, were determined after a series of painting and cleaning of graffiti (markers and sprays). The tested objects were subjected to artificial simulated ageing using laboratory solar radiation in a synergistic combination of temperature and humidity in accordance with PN-EN ISO 16474-2 and in accordance with the proprietary methodology described in DN 001/08/A2/16 section 4.1.8 using the UV-C radiation source (discrete spectrum). The tested samples were also subjected to a different type of ageing mechanism under strong corrosive conditions in the form of neutral salt spray according to the methodology described in PN-EN ISO 9227.
    Źródło:
    Problemy Kolejnictwa; 2022, 195; 97--116
    0552-2145
    2544-9451
    Pojawia się w:
    Problemy Kolejnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Lyapunov functional for a neutral system with a time-varying delay
    Autorzy:
    Duda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200885.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Lyapunov functional
    time-varying delay
    neutral system
    Opis:
    The paper presents a method of determining of the Lyapunov functional for a linear neutral system with an interval time-varying delay. The Lyapunov functional is constructed for the system with a time-varying delay with a given time derivative, which is calculated on the trajectory of the system with a time-varying delay. The presented method gives analytical formulas for the coefficients of the Lyapunov functional.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 911-918
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lyapunov functional for a system with k-non-commensurate neutral time delays
    Autorzy:
    Duda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/970175.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    Lyapunov functional
    time delay system
    neutral system
    LTI system
    Opis:
    The paper presents a method of determining the Lyapunov quadratic functional for linear time-invariant system with k-non-commensurate neutral type time delays. The Lyapunov functional is constructed for its given time derivative, which is calculated on the trajectory of the system with k-non-commensurate neutral type time delays. The presented method gives analytical formulas for the coefficients of the Lyapunov functional.
    Źródło:
    Control and Cybernetics; 2010, 39, 4; 1173-1184
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lyapunov matrices approach to the parametric optimization of a neutral system
    Autorzy:
    Duda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/229256.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neutral system
    Lyapunov matrix
    Lyapunov functional
    Opis:
    In the paper a Lyapunov matrices approach to the parametric optimization problem of a neutral system with a P-controller is presented. The value of integral quadratic performance index of quality is equal to the value of Lyapunov functional for the initial function of the neutral system. The Lyapunov functional is determined by means of the Lyapunov matrix.
    Źródło:
    Archives of Control Sciences; 2016, 26, 1; 81-93
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lyapunov matrices approach to the parametric optimization of a system with two delays and a PD-controller
    Autorzy:
    Duda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/229274.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neutral system
    Lyapunov matrix
    Lyapunov functional
    Opis:
    In the paper the parametric optimization problem for a linear system with two delays and a PD-controller is presented. In the parametric optimization problem the quadratic performance index is considered. The value of the quadratic index of quality is calculated due to the Lyapunov functional and is equal to the value of that functional for the initial function of the neutral system with two delays. The Lyapunov functional is determined by means of the Lyapunov matrix.
    Źródło:
    Archives of Control Sciences; 2018, 28, 4; 585-600
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric optimization of a neutral system with two delays and PD-controller
    Autorzy:
    Duda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/229662.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    parametric optimization
    Lyapunov functional
    time delay system
    neutral system
    Opis:
    In this paper a parametric optimization problem for a linear neutral system with two delays with an integral quadratic performance index is formulated and solved. The method of computing of a performance index value bases on determining of a Lyapunov functional defined on a state space such that its value for an initial state is equal to a performance index value. In the paper a form of a Lyapunov functional is assumed and a method of computing its coefficients is given. An example illustrating the application of discussed theory is presented. It concerns the system with a PD-controller designed to control a plant with two delays both retarded and neutral type. For such system a value of considered performance index is determined.
    Źródło:
    Archives of Control Sciences; 2013, 23, 2; 131-143
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric optimization of neutral linear system with two delays with P-controller
    Autorzy:
    Duda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/229977.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    parametric optimization
    Lyapunov functional
    time delay system
    neutral system
    Opis:
    In the paper the problem of parametric optimization of a linear neutral system with two delays accomplished with respect to the integral quadratic performance index is formulated and solved. A method of computing the value of performance index relies on determining such a Lyapunov functional defined on the state space that its value for the initial state is equal to that of performance index. In the paper the form of Lyapunov functional is assumed and a method of computing its coefficients is given. An example illustrating the application of the theory discussed is presented. It concerns a system with the P-controller designed to control a plant with two delays both retarded and neutral type. For such a system the value of the considered performance index is determined.
    Źródło:
    Archives of Control Sciences; 2011, 21, 4; 363-372
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equivalence and reduction of delay-differential systems
    Autorzy:
    Boudellioua, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/911236.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    opis macierzowy
    układ z opóźnieniem
    równoważność systemu
    bazy Gröbnera
    polynomial matrix description
    neutral delay-differential systems
    strict system equivalence
    determinantal ideals
    Gröbner bases
    Opis:
    A new direct method is presented which reduces a given high-order representation of a control system with delays to a firstorder form that is encountered in the study of neutral delay-differential systems. Using the polynomial system description (PMD) setting due to Rosenbrock, it is shown that the transformation connecting the original PMD with the first-order form is Fuhrmann’s strict system equivalence. This type of system equivalence leaves the transfer function and other relevant structural properties of the original system invariant.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 1; 15-22
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lossless transmission lines terminated by crystal oscillator circuit
    Autorzy:
    Angelov, Vasil G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065397.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Fixed point theorem
    Kirchhoff’s law
    Lossless transmission line
    Mixed problem for hyperbolic system
    Neutral equation
    Periodic solution
    Opis:
    The present paper deals with ТЕМ propagation of waves along lossless transmission lines terminated by a crystal oscillator circuit. The crystal oscillator circuit generates nonlinear boundary conditions derived by the Kirchhoff’s law. Then the mixed problem for the hyperbolic transmission line system to an initial value problem for neutral system on the boundary is reduced. The main purpose of the present paper is to show an existence-uniqueness of a periodic solution of the neutral system. This is achieved by introducing a suitable operator acting on a space of periodic functions. Its fixed point is a periodic solution of the neutral system. The advantages of the presented method on numerical example are demonstrated. The solution can be obtained by successive approximations.
    Źródło:
    World Scientific News; 2019, 132; 65-83
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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