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    Wyświetlanie 1-5 z 5
    Tytuł:
    Reliability modeling of fault tolerant control systems
    Autorzy:
    Li, H.
    Zhao, Q.
    Yang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/929822.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie tolerujące uszkodzenia
    ocena niezawodności
    procesy semimarkowskie
    fault tolerant control
    reliability evaluation
    semi-Markov processes
    Opis:
    This paper proposes a novel approach to reliability evaluation for active Fault Tolerant Control Systems (FTCSs). By introducing a reliability index based on the control performance and hard deadline, a semi-Markov process model is proposed to describe system operation for reliability evaluation. The degraded performance of FTCSs in the presence of imperfect Fault Detection and Isolation (FDI) is reflected by semi-Markov states. The semi-Markov kernel, the key parameter of the process, is determined by four probabilistic parameters based on the Markovian model of FTCSs. Computed from the transition probabilities of the semi-Markov process, the reliability index incorporates control objectives, hard deadline, and the effects of imperfect FDI, a suitable quantitative measure of the overall performance.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 4; 491-504
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptive modeling of reliability properties for control and supervision purposes
    Autorzy:
    Dettmann, K. U.
    Söffker, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/907535.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    niezawodność
    estymacja parametrów
    kumulacja uszkodzeń
    reliability
    parameter estimation
    damage accumulation
    probabilistic simulation
    Opis:
    Modeling of reliability characteristics typically assumes that components and systems fail if a certain individual damage level is exceeded. Every (mechanical) system damage increases irreversibly due to employed loading and (mechanical) stress, respectively. The main issue of damage estimation is adequate determination of the actual state-of-damage. Several mathematical modeling approaches are known in the literature, focusing on the task of how loading effects damage progression (e.g., Wöhler, 1870) for wear processes. Those models are only valid for specific loading conditions, a priori assumptions, set points, etc. This contribution proposes a general model, covering adequately the deterioration of a set of comparable systems under comparable loading. The main goal of this contribution is to derive the loading-damage connection directly from observation without assuming any damage models at the outset. Moreover, the connection is not investigated in detail (e.g., to examine the changes in material, etc.) but only approximated with a probabilistic approach. The idea is subdivided into two phases: A problem-specific relation between loading applied (to a structure, which contributes to the stress) and failure is derived from simulation, where a probabilistic approach only assumes a distribution function. Subsequently, an adequate general model is set up to describe deterioration progression. The scheme will be shown through simulation-based results and can be used for estimation of the remaining useful life and predictive maintenance/control.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 479-486
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconfigurable control design with integration of a reference governor and reliability indicators
    Autorzy:
    Weber, P.
    Boussaid, B.
    Khelassi, A.
    Theilliol, D.
    Aubrun, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/331471.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system tolerujący uszkodzenia
    szacowanie niezawodności
    fault tolerant control system
    control allocation
    reliability estimation
    performance degradation
    reference governor
    Opis:
    A new approach to manage actuator redundancy in the presence of faults is proposed based on reliability indicators and a reference governor. The aim is to preserve the health of the actuators and the availability of the system both in the nominal behavior and in the presence of actuator faults. The use of reference governor control allocation is a solution to distribute the control efforts among a redundant set of actuators. In a degraded situation, a reconfigured control allocation strategy is proposed based on on-line re-estimation of the actuator reliability. A benefit of incorporating reliability indicators into over-actuated control system design is the smart management of the redundant actuators and improvement of the system safety. Moreover, when the fault is severe, an adaptation approach using the reference governor is proposed. The reference governor unit is a reference-offset governor based on a discrete-time predictive control strategy. The idea is to modify the reference according to the system constraints, which become stricter after the occurrence of an actuator fault. The proposed approach is illustrated with a flight control application.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 139-148
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Health-aware and fault-tolerant control of an octorotor UAV system based on actuator reliability
    Autorzy:
    Salazar, Jean Carlo
    Sanjuan, Adrián
    Nejjari, Fatiha
    Sarrate, Ramon
    Powiązania:
    https://bibliotekanauki.pl/articles/329705.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    prognostics and health management
    health aware control
    fault-tolerant control
    reliability analysis
    octorotor
    UAV system
    zarządzanie zdrowiem
    sterowanie tolerujące uszkodzenia
    analiza niezawodności
    Opis:
    A major goal in modern flight control systems is the need for improving reliability. This work presents a health-aware and fault-tolerant control approach for an octorotor UAV that allows distributing the control effort among the available actuators based on their health information. However, it is worth mentioning that, in the case of actuator fault occurrence, a reliability improvement can come into conflict with UAV controllability. Therefore, system reliability sensitivity is redefined and modified to prevent uncontrollable situations during the UAV’s mission. The priority given to each actuator is related to its importance in system reliability. Moreover, the proposed approach can reconfigure the controller to compensate actuator faults and improve the overall system reliability or delay maintenance tasks.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2020, 30, 1; 47-59
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability-aware zonotopic tube-based model predictive control of a drinking water network
    Autorzy:
    Khoury, Boutrous
    Nejjari, Fatiha
    Puig, Vicenç
    Powiązania:
    https://bibliotekanauki.pl/articles/2124779.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault tolerant control
    robust MPC
    zonotopes
    Bayesian theory
    drinking water network
    sterowanie tolerujące uszkodzenia
    zonotopy
    teoria bayesowska
    sieć wody pitnej
    Opis:
    A robust economic model predictive control approach that takes into account the reliability of actuators in a network is presented for the control of a drinking water network in the presence of uncertainties in the forecasted demands required for the predictive control design. The uncertain forecasted demand on the nominal MPC may make the optimization process intractable or, to a lesser extent, degrade the controller performance. Thus, the uncertainty on demand is taken into account and considered unknown but bounded in a zonotopic set. Based on this uncertainty description, a robust MPC is formulated to ensure robust constraint satisfaction, performance, stability as well as recursive feasibility through the formulation of an online tube-based MPC and an accompanying appropriate terminal set. Reliability is then modelled based on Bayesian networks, such that the resulting nonlinear function accommodated in the optimization setup is presented in a pseudo-linear form by means of a linear parameter varying representation, mitigating any additional computational expense thanks to the formulation as a quadratic optimization problem. With the inclusion of a reliability index to the economic dominant cost of the MPC, the network users’ requirements are met whilst ensuring improved reliability, therefore decreasing short and long term operational costs for water utility operators. Capabilities of the designed controller are demonstrated with simulated scenarios on the Barcelona drinking water network.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2022, 32, 2; 197--211
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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