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    Wyświetlanie 1-3 z 3
    Tytuł:
    Robust Stabilization for Uncertain Time-Varying Delay Constrained Systems With Delay-Dependence
    Autorzy:
    Han, Q. L.
    Mehdi, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/908298.pdf
    Data publikacji:
    1999
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system opóźniania
    stabilizacja
    odporność na błędy
    time-delay systems
    stabilization
    robustness
    nonlinear parametric perturbations
    saturating actuators
    Opis:
    This paper is concerned with the problem of robust stabilization of linear time-varying delay systems containing saturating actuators in the presence of nonlinear parametric perturbations. Based on Razumikhin's approach to the stability of functional differential equations, we determine upper bounds on the time-varying delay such that the uncertain system under consideration is robustly globally or locally asymptotically stabilizable via memoryless state feedback control laws. The obtained bounds are given in terms of solutions to Lyapunov equations. Two numerical examples are included to illustrate the results.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 1999, 9, 2; 293-311
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An active fault-tolerant control framework against actuator stuck failures under input saturations
    Autorzy:
    Qi, X.
    Theilliol, D.
    He, Y.
    Han, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331084.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault tolerant control
    actuator stuck failure
    actuator constraints
    reference redesign
    linear matrix inequality
    sterowanie tolerujące uszkodzenia
    projekt odniesienia
    liniowa nierówność macierzowa
    Opis:
    In this paper, a control framework including active fault-tolerant control (FTC) and reference redesign is developed subject to actuator stuck failures under input saturations. FTC synthesis and reference redesign approaches are proposed to guarantee post-fault system safety and reference reachability. Then, these features are analyzed under both actuator stuck failures and constraints before fault-tolerant controller switches. As the main contribution, actuator stuck failures and constraints are unified so that they can be easily considered simultaneously. By means of transforming stuck failures into actuator constraints, the post-fault system can be regarded as an equivalent system with only asymmetrical actuator constraints. Thus, methods against actuator saturations can be used to guarantee regional stability and produce the stability region. Based on this region, stuck compensation is analyzed. Specifically, an unstable open-loop system is considered, which is more challenging. Furthermore, the method is extended to a set-point tracking problem where the reachability of the original reference can be evaluated. Then, a new optimal reference will be computed for the post-fault system if the original one is unreachable. Finally, simulation examples are shown to illustrate the theoretical results.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 4; 749-761
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous state and parameter estimation based actuator fault detection and diagnosis for an unmanned helicopter
    Autorzy:
    Wu, C.
    Qi, J.
    Song, D.
    Qi, X.
    Han, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/329847.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    actuator fault detection
    actuator fault diagnosis
    unmanned helicopter
    Kalman filter
    set membership filter
    adaptive scheme
    detekcja uszkodzeń
    diagnostyka uszkodzeń
    śmigłowiec bezzałogowy
    filtr Kalmana
    Opis:
    Simultaneous state and parameter estimation based actuator fault detection and diagnosis (FDD) for single-rotor unmanned helicopters (UHs) is investigated in this paper. A literature review of actuator FDD for UHs is given firstly. Based on actuator healthy coefficients (AHCs), which are introduced to represent actuator faults, a combined dynamic model is established with the augmented state containing both the flight state and AHCs. Then the actuator fault detection and diagnosis problem is transformed into a general nonlinear estimation one: given control inputs and the measured flight state contaminated by measurement noises, estimate both the flight state and AHCs recursively in each time-step, which is also known as the simultaneous state and parameter estimation problem. The estimated AHCs can further be used for fault tolerant control (FTC). Based on the existing widely used nonlinear estimation methods such as the unscented Kalman filter (UKF) and the extended set-membership filter (ESMF), three kinds of adaptive schemes (KF-UKF, MIT-UKF and MIT-ESMF) are proposed by our team to improve the actuator FDD performance. A comprehensive comparative study on these different estimation methods is given in detail to illustrate their advantages and disadvantages when applied to unmanned helicopter actuator FDD.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 175-187
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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