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    Wyświetlanie 1-6 z 6
    Tytuł:
    Reducing the mast vibration of single-mast stacker cranes by gain-scheduled control
    Autorzy:
    Hajdu, S.
    Gáspár, P.
    Tematy:
    robust control
    LPV systems
    gain scheduling
    stacker cranes
    sterowanie odporne
    szeregowanie zadań
    układnica
    Pokaż więcej
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Powiązania:
    https://bibliotekanauki.pl/articles/331336.pdf  Link otwiera się w nowym oknie
    Opis:
    In the frame structure of stacker cranes harmful mast vibrations may appear due to the inertial forces of acceleration or the braking movement phase. This effect may reduce the stability and positioning accuracy of these machines. Unfortunately, their dynamic properties also vary with the lifted load magnitude and position. The purpose of the paper is to present a controller design method which can handle the effect of a varying lifted load magnitude and position in a dynamic model and at the same time reveals good reference signal tracking and mast vibration reducing properties. A controller design case study is presented step by step from dynamic modeling through to the validation of the resulting controller. In the paper the dynamic modeling possibilities of single-mast stacker cranes are summarized. The handling of varying dynamical behavior is realized via the polytopic LPV modeling approach. Based on this modeling technique, a gain-scheduled controller design method is proposed, which is suitable for achieving the goals set. Finally, controller validation is presented by means of time domain simulations.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust fault detection of singular LPV systems with multiple time-varying delays
    Autorzy:
    Hassanabadi, A. H.
    Shafiee, M.
    Puig, V.
    Tematy:
    singular delayed LPV systems
    fault detection
    unknown input observer
    robustness
    fault sensitivity
    detekcja uszkodzeń
    odporność
    wada wrażliwości
    Pokaż więcej
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Powiązania:
    https://bibliotekanauki.pl/articles/331490.pdf  Link otwiera się w nowym oknie
    Opis:
    In this paper, the robust fault detection problem for LPV singular delayed systems in the presence of disturbances and actuator faults is considered. For both disturbance decoupling and actuator fault detection, an unknown input observer (UIO) is proposed. The aim is to compute a residual signal which has minimum sensitivity to disturbances while having maximum sensitivity to faults. Robustness to unknown inputs is formulated in the sense of the H∞-norm by means of the bounded real lemma (BRL) for LPV delayed systems. In order to formulate fault sensitivity conditions, a reference model which characterizes the ideal residual behavior in a faulty situation is considered. The residual error with respect to this reference model is computed. Then, the maximization of the residual fault effect is converted to minimization of its effect on the residual error and is addressed by using the BRL. The compromise between the unknown input effect and the fault effect on the residual is translated into a multi-objective optimization problem with some LMI constraints. In order to show the efficiency and applicability of the proposed method, a part of the Barcelona sewer system is considered.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust sensor fault estimation for descriptor-LPV systems with unmeasurable gain scheduling functions: Application to an anaerobic bioreactor
    Autorzy:
    López-Estrada, F. R.
    Ponsart, J. C.
    Theilliol, D.
    Astorga-Zaragoza, C. M.
    Camas-Anzueto, J. L.
    Tematy:
    fault diagnosis
    fault estimation
    LPV systems
    observer design
    descriptor system
    diagnostyka uszkodzeń
    estymacja błędu
    obserwator
    układ deskryptorowy
    Pokaż więcej
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Powiązania:
    https://bibliotekanauki.pl/articles/331392.pdf  Link otwiera się w nowym oknie
    Opis:
    This paper addresses the design of a state estimation and sensor fault detection, isolation and fault estimation observer for descriptor-linear parameter varying (D-LPV) systems. In contrast to where the scheduling functions depend on some measurable time varying state, the proposed method considers the scheduling function depending on an unmeasurable state vector. In order to isolate, detect and estimate sensor faults, an augmented system is constructed by considering faults to be auxiliary state vectors. An unknown input LPV observer is designed to estimate simultaneously system states and faults. Sufficient conditions to guarantee stability and robustness against the uncertainty provided by the unmeasurable scheduling functions and the influence of disturbances are synthesized via a linear matrix inequality (LMI) formulation by considering H∞ and Lyapunov approaches. The performances of the proposed method are illustrated through the application to an anaerobic bioreactor model.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LPV design of fault-tolerant control for road vehicles
    Autorzy:
    Gáspár, P.
    Szabó, Z.
    Bokor, J.
    Tematy:
    sterowanie odporne
    detekcja uszkodzeń
    sterowanie tolerujące uszkodzenia
    sterowanie pojazdem
    robust control
    fault detection
    LPV systems
    fault tolerant control
    vehicle dynamics
    vehicle control
    Pokaż więcej
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Powiązania:
    https://bibliotekanauki.pl/articles/331462.pdf  Link otwiera się w nowym oknie
    Opis:
    The aim of the paper is to present a supervisory decentralized architecture for the design and development of reconfigurable and fault-tolerant control systems in road vehicles. The performance specifications are guaranteed by local controllers, while the coordination of these components is provided by a supervisor. Since the monitoring components and FDI filters provide the supervisor with information about the various vehicle maneuvers and the different fault operations, it is able to make decisions about necessary interventions into the vehicle motions and guarantee reconfigurable and fault-tolerant operation of the vehicle. The design of the proposed reconfigurable and fault-tolerant control is based on an LPV method that uses monitored scheduling variables during the operation of the vehicle.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault tolerant control design for polytopic LPV systems
    Autorzy:
    Rodrigues, M.
    Theilliol, D.
    Aberkane, S.
    Sauter, D.
    Tematy:
    sterowanie tolerujące uszkodzenia
    interfejs lokalnego zarządzania
    liniowa nierówność macierzowa
    fault tolerant control
    multiple actuator failures
    polytopic LPV systems
    LMI
    static output feedback
    stability
    Pokaż więcej
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Powiązania:
    https://bibliotekanauki.pl/articles/911248.pdf  Link otwiera się w nowym oknie
    Opis:
    This paper deals with a Fault Tolerant Control (FTC) strategy for polytopic Linear Parameter Varying (LPV) systems. The main contribution consists in the design of a Static Output Feedback (SOF) dedicated to such systems in the presence of multiple actuator faults/failures. The controllers are synthesized through Linear Matrix Inequalities (LMIs) in both faultfree and faulty cases in order to preserve the system closed-loop stability. Hence, this paper provides a new sufficient (but not necessary) condition for the solvability of the stabilizing output feedback control problem. An example illustrates the effectiveness and performances of the proposed FTC method.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical synthesis of parameter-varying filter of constant component with application to switching systems
    Autorzy:
    Piskorowski, J.
    Kaszyński, R.
    Tematy:
    data acquisition
    analog signal processing
    transient behavior
    dynamics
    switching systems
    linear parameter-varying technique (LPV)
    linear time-varying systems (LTV)
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/221736.pdf  Link otwiera się w nowym oknie
    Opis:
    In this paper, we propose a concept of a continuous-time filter of constant component that exhibits a very short response in the time domain if compared to the traditional time-invariant filter. The improvement of the filter dynamics was achieved as a result of the time-varying parameters which were introduced to the filter structure. Such a designed filter is then applied in a system which switches many distorted signals which should be filtered as fast as possible. The paper is of review nature and presents both a theoretical background of the proposed filter and the results of simulations.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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