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    Wyświetlanie 1-11 z 11
    Tytuł:
    Robust H∞ control for uncertain neutral time-delay systems with discrete and distributed delays
    Autorzy:
    Sun, M.
    Fu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/205639.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    time-delay
    linear matrix inequalities
    uncertain neutral systems
    H[infinity] control
    Opis:
    In this paper, the robust H∞ control problem is considered for uncertain neutral systems with discrete and distributed tirne delays. Some sumcient conditions on H∞, robust performance analysis are obtained in terms of linear matrix inequalities (LMIs) by using a descriptor model transformation of the system and by applying Park's inequality for bounding cross terms. Based on these conditions the state-feedback H∞ controller is designed. Numerical examples are included to illustrate the proposed method.
    Źródło:
    Control and Cybernetics; 2011, 40, 1; 25-38
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On fault tolerant control structures incorporating fault estimation
    Autorzy:
    Krokavec, D.
    Filasová, A.
    Liščinský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/229298.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    linear systems
    fault tolerant control
    fault estimation
    linear matrix inequalities
    H∞ norm
    H2/H∞ control strategy
    Opis:
    The paper provides the minimal necessary modifications of linear matrix inequality conditions for the mixed H2/H∞ control design as well as for the augmented observer-based fault estimation to be mutually compatible in joint design of integrated fault estimation and fault tolerant control. To be possible, within this integration, to design the controller which guarantees a pre-specified H∞ norm disturbance attenuation level, the design conditions has to be regularized using the H2 performance index and, moreover, augmented fault observer must be of enforced dynamics. Analyzing the ambit of performances given on the mixed H2/H∞ design, the joint design conditions are formulated as a minimization problem subject to convex constraints expressed by a system of LMIs. The feasibility of the conditions is demonstrated by a numerical example.
    Źródło:
    Archives of Control Sciences; 2016, 26, 4; 453-469
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fault tolerant direct control allocation scheme with integral sliding modes
    Autorzy:
    Hamayun, M. T.
    Edwards, C.
    Alwi, H.
    Bajodah, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/330832.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault tolerant control
    integral sliding mode control
    linear matrix inequalities
    sterowanie tolerujące uszkodzenia
    sterowanie ślizgowe
    liniowe nierówności macierzowe
    Opis:
    In this paper, integral sliding mode control ideas are combined with direct control allocation in order to create a fault tolerant control scheme. Traditional integral sliding mode control can directly handle actuator faults; however, it cannot do so with actuator failures. Therefore, a mechanism needs to be adopted to distribute the control effort amongst the remaining functioning actuators in cases of faults or failures, so that an acceptable level of closed-loop performance can be retained. This paper considers the possibility of introducing fault tolerance even if fault or failure information is not provided to the control strategy. To demonstrate the efficacy of the proposed scheme, a high fidelity nonlinear model of a large civil aircraft is considered in the simulations in the presence of wind, gusts and sensor noise.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 93-102
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust H∞ output feedback control of bidirectional inductive power transfer systems
    Autorzy:
    Swain, A.
    Almakhles, D.
    Neath, M. J.
    Nasiri, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/230097.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inductive power transfer
    wireless power transfer
    robust control
    linear matrix inequalities
    sensitivity analysis
    Opis:
    Bidirectional Inductive power transfer (IPT) systems behave as high order resonant networks and hence are highly sensitive to changes in system parameters. Traditional PID controllers often fail to maintain satisfactory power regulation in the presence of parametric uncertainties. To overcome these problems, this paper proposes a robust controller which is designed using linear matrix inequality (LMI) techniques. The output sensitivity to parametric uncertainty is explored and a linear fractional transformation of the nominal model and its uncertainty is discussed to generate a standard configuration for μ-synthesis and LMI analysis. An H∞ controller is designed based on the structured singular value and LMI feasibility analysis with regard to uncertainties in the primary tuning capacitance, the primary and pickup inductors and the mutual inductance. Robust stability and robust performance of the system is studied through μ-synthesis and LMI feasibility analysis. Simulations and experiments are conducted to verify the power regulation performance of the proposed controller.
    Źródło:
    Archives of Control Sciences; 2017, 27, 1; 41-62
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptive control through on-line optimization. The MPCI paradigm and variants
    Autorzy:
    Nikolaou, M.
    Eker, S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/908314.pdf
    Data publikacji:
    1999
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie adaptacyjne
    sterowanie predykcyjne
    wzbudzanie trwałe
    adaptive control
    model predictive control
    closed-loop identification
    persistent excitation
    linear matrix inequalities
    semidefinite programming
    Opis:
    A new variant of Model Predictive Control and Identification (MPCI) is proposed. The on-line objective is not to minimize the sum of square errors, but to maximize on-line the sum of the lower bounds on the minimum eigenvalues of the information matrices over finite horizons. In that way, inputs to the controlled process are allowed to excite the process highly enough to generate as much modelling information as possible, while the process goes off-spec as little as possible. Constraints can be loosened or tightened according to the need for identification. The effectiveness of the proposed new methodology is illustrated through a number of simulations.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 1999, 9, 1; 25-52
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust quasi-LPV model reference FTC of a quadrotor UAV subject to actuator faults
    Autorzy:
    Rotondo, D.
    Nejjari, F.
    Puig, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/331147.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    linear parameter varying systems
    fault tolerant control
    quadrotor
    model reference based control
    linear matrix inequalities
    układ liniowy niestacjonarny
    sterowanie tolerujące uszkodzenia
    liniowe nierówności macierzowe
    Opis:
    A solution for fault tolerant control (FTC) of a quadrotor unmanned aerial vehicle (UAV) is proposed. It relies on model reference-based control, where a reference model generates the desired trajectory. Depending on the type of reference model used for generating the reference trajectory, and on the assumptions about the availability and uncertainty of fault estimation, different error models are obtained. These error models are suitable for passive FTC, active FTC and hybrid FTC, the latter being able to merge the benefits of active and passive FTC while reducing their respective drawbacks. The controller is generated using results from the robust linear parameter varying (LPV) polytopic framework, where the vector of varying parameters is used to schedule between uncertain linear time invariant (LTI) systems. The design procedure relies on solving a set of linear matrix inequalities (LMIs) in order to achieve regional pole placement and H∞ norm bounding constraints. Simulation results are used to compare the different FTC strategies.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 7-22
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new D-stability area for linear discrete-time systems
    Autorzy:
    Krokavec, Dušan
    Filasová, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/229462.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    discrete-time linear systems
    state control
    pole placement onstraints
    D-stability region
    linear matrix inequalities
    polytopic uncertainties
    Opis:
    The paper addresses the problem of constrained pole placement in discrete-time linear systems. The design conditions are outlined in terms of linear matrix in equalities for the D-stable ellipse region in the complex Z plain. In addition, it is demonstrated that the D-stable circle region formulation is the special case of by this way formulated and solved pole placement problem. The proposed principle is enhanced for discrete-time linear systems with polytopic uncertainties.
    Źródło:
    Archives of Control Sciences; 2019, 29, 1; 5-23
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relaxed formulation of the design conditions for Takagi-Sugeno fuzzy virtual actuators
    Autorzy:
    Filasova, A.
    Krokavec, D.
    Liscinsky, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/229418.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nonlinear dynamic systems
    Takagi-Sugeno fuzzy models
    fault tolerant control
    static output controllers
    virtual actuators
    linear matrix inequalities
    Opis:
    The H∞ norm approach to virtual actuators design, intended to Takagi-Sugeno fuzzy continuous-time systems, is presented in the paper. Using the second Ljapunov method, the design conditions are formulated in terms of linear matrix inequalities in adapted bounded real lemma structures. Related to the static output controller, and for systems under influence of single actuator faults, the design steps are revealed for a three-tank system plant.
    Źródło:
    Archives of Control Sciences; 2016, 26, 2; 199-221
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decentralized multi-agent formation control with pole-region placement via cone-complementarity linearization
    Autorzy:
    González, Antonio
    Sala, Antonio
    Armesto, Leopoldo
    Powiązania:
    https://bibliotekanauki.pl/articles/2172117.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    multiagent autonomous system
    formation control
    linear matrix inequalities
    cone complementarity linearization
    system wieloagentowy
    sterowanie formacją
    liniowe nierówności macierzowe
    Opis:
    An output-feedback decentralised formation control strategy is pursued under pole-region constraints, assuming that the agents have access to relative position measurements with respect to a set of neighbors in a graph describing the sensing topology. No communication between the agents is assumed; however, a shared one-way communication channel with a pilot is needed for steering tasks. Each agent has a separate copy of the same controller. A virtual structure approach is presented for the formation steering as a whole; actual formation control is established via cone-complementarity linearization algorithms for the appropriate matrix inequalities. In contrast to other research where only stable consensus is pursued, the proposed method allows us to specify settling-time, damping and bandwidth limitations via pole regions. In addition, a full methodology for the decoupled handling of steering and formation control is provided. Simulation results in the example section illustrate the approach.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2022, 32, 3; 415--428
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fault estimation and fault-tolerant control based sliding mode observer for LPV descriptor systems with time delay
    Autorzy:
    Hamdi, Habib
    Rodrigues, Mickael
    Rabaoui, Bouali
    Benhadj Braiek, Naceur
    Powiązania:
    https://bibliotekanauki.pl/articles/1838208.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault estimation
    fault-tolerant control
    LPV descriptor system
    sliding mode observer
    time delay
    LMIs
    linear matrix inequalities
    estymacja błędu
    sterowanie odporne na uszkodzenia
    sterowanie ślizgowe
    liniowa nierówność macierzowa
    Opis:
    This paper considers the problem of fault-tolerant control (FTC) and fault reconstruction of actuator faults for linear parameter varying (LPV) descriptor systems with time delay. A polytopic sliding mode observer (PSMO) is synthesized to achieve simultaneous reconstruction of LPV polytopic descriptor system states and actuator faults. Exploiting the reconstructed actuator faults and state estimates, a fault-tolerant controller is designed to compensate the impact of actuator faults on system performance by stabilizing the closed-loop LPV delayed descriptor system. Besides, the controller and PSMO gains are obtained throughout the resolution of linear matrix inequalities (LMIs) using convex optimization techniques. The developed PSMO could force the output estimation error to converge to zero in a finite time when the actuators faults are bounded through the reinjection of the output estimation error via a nonlinear switching term. Simulation results applied to a given numerical system are presented to highlight the superiority and effectiveness of the proposed approach.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 2; 247-258
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observer-based fault-tolerant control against sensor failures for fuzzy systems with time delays
    Autorzy:
    Tong, S.
    Yang, G.
    Zhang, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/930168.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie rozmyte
    sterowanie z opóźnieniem
    obserwator stanu
    sterowanie tolerujące uszkodzenia
    liniowa nierówność macierzowa
    analiza stateczności
    fuzzy time delay systems
    sensor faults
    state observer
    fault tolerant control
    linear matrix inequalities
    stability analysis
    Opis:
    This paper addresses the problems of robust fault estimation and fault-tolerant control for Takagi-Sugeno (T-S) fuzzy systems with time delays and unknown sensor faults. A fuzzy augmented state and fault observer is designed to achieve the system state and sensor fault estimates simultaneously. Furthermore, based on the information of on-line fault estimates, an observer-based dynamic output feedback fault-tolerant controller is developed to compensate for the effect of faults by stabilizing the resulting closed-loop system. Sufficient conditions for the existence of both a state observer and a fault-tolerant controller are given in terms of linear matrix inequalities. A simulation example is given to illustrate the effectiveness of the proposed approach.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 4; 617-627
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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