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    Wyświetlanie 1-7 z 7
    Tytuł:
    Reliability Design of Complex Systems by Minimizing the Lifetime Variance
    Autorzy:
    Łobos, E.
    Momot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/908509.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    matematyka
    reliability
    constant failure rate
    redundancy
    Opis:
    The problem considered in this paper is the minimization of the lifetime variance of a complex system subject to its expected life and economic constraints. The example of a bridge network, in which all elements have constant failure rates, illustrates the problem. A numerical algorithm for solving this optimization problem by using exact formulae for system lifetime moments is included. Using this algorithm, we can obtain results better than the solutions known from earlier papers.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2002, 12, 4; 553-557
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Redundancy-based intrusion tolerance approaches moving from classical fault tolerance methods
    Autorzy:
    Di Giandomenico, Felicita
    Masetti, Giulio
    Chiaradonna, Silvano
    Powiązania:
    https://bibliotekanauki.pl/articles/2172130.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    intrusion tolerance
    cyberattack
    diversity based redundancy
    protection mechanisms
    tolerancja na włamania
    atak cybernetyczny
    mechanizm ochronny
    Opis:
    Borrowing from well known fault tolerant approaches based on redundancy to mask the effect of faults, redundancy-based intrusion tolerance schemes are proposed in this paper, where redundancy of ICT components is exploited as a first defense line against a subset of compromised components within the redundant set, due to cyberattacks. Features to enhance defense and tolerance capabilities are first discussed, covering diversity-based redundancy, confusion techniques, protection mechanisms, locality policies and rejuvenation phases. Then, a set of intrusion tolerance variations of classical fault tolerant schemes (including N Version Programming and Recovery Block, as well as a few hybrid approaches) is proposed, by enriching each original scheme with one or more of the previously introduced defense mechanisms. As a practical support to the system designer in making an appropriate choice among the available solutions, for each developed scheme a schematic summary is provided, in terms of resources and defense facilities needed to tolerate f value failures and k omission failures, as well as observations regarding time requirements. To provide an example of more detailed analysis, useful to set up an appropriate intrusion tolerance configuration, a trade-off study between cost and additional redundancy employed for confusion purposes is also carried out.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2022, 32, 4; 701--719
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An SFDI observer-based scheme for a general aviation aircraft
    Autorzy:
    Ariola, M.
    Mattei, M.
    Notaro, I.
    Corraro, F.
    Sollazzo, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/330264.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    model based FDI
    sensor FDI
    extended Kalman filtering
    analytical redundancy
    flight control
    filtracja Kalmana
    redundancja analityczna
    sterowanie lotem
    Opis:
    The problem of detecting and isolating sensor faults (sensor fault detection and isolation—SFDI) on a general aviation aircraft, in the presence of external disturbances, is considered. The proposed approach consists of an extended Kalman observer applied to an augmented aircraft plant, where some integrators are added to the output variables subject to faults. The output of the integrators should be ideally zero in the absence of model uncertainties, external disturbances and sensor faults. A threshold-based decision making system is adopted where the residuals are weighted with gains coming from the solution to an optimization problem. The proposed nonlinear observer was tested both numerically on a large database of simulations in the presence of disturbances and model uncertainties and on input-output data recorded during real flights. In this case, the possibility of successfully applying the proposed technique to detect and isolate faults on inertial and air data sensors, modelled as step or ramp signals artificially added to the real measurements, is shown.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 149-158
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new efficient and flexible algorithm for the design of testable subsystems
    Autorzy:
    Ploix, S.
    Yassine, A. A.
    Flaus, J.-M.
    Powiązania:
    https://bibliotekanauki.pl/articles/907766.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    automatic test design
    structural approach
    fault diagnosis
    analytical redundancy relations
    relational algebra
    podejście strukturalne
    diagnostyka uszkodzeń
    algebra relacyjna
    Opis:
    In complex industrial plants, there are usually many sensors and the modeling of plants leads to lots of mathematical relations. This paper presents a general method for finding all the possible testable subsystems, i.e., sets of relations that can lead to various types of detection tests. This method, which is based on structural analysis, provides the constraints that have to be used for the design of each detection test and manages situations where constraints contain non-deductible variables and where some constraints cannot be gathered in the same test. Thanks to these results, it becomes possible to select the most interesting testable subsystems regarding detectability and diagnosability criteria. Application examples dealing with a road network, a digital counter and an electronic circuit are presented.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2010, 20, 1; 175-190
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Redundancy relations for fault diagnosis in nonlinear uncertain systems
    Autorzy:
    Shumsky, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/929809.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    detekcja uszkodzeń
    lokalizacja uszkodzeń
    system nieliniowy
    podejście algebraiczne
    podejście geometryczne
    fault detection and isolation
    nonlinear systems
    redundancy relations
    full decoupling
    algebraic approach
    geometric approach
    Opis:
    The problem of fault detection and isolation in nonlinear uncertain systems is studied within the scope of the analytical redundancy concept. The problem solution involves checking the redundancy relations existing among measured system inputs and outputs. A novel method is proposed for constructing redundancy relations based on system models described by differential equations whose right-hand sides are polynomials. The method involves a nonlinear transformation of the initial system model into a strict feedback form. Algebraic and geometric tools are used for this transformation. The features of the method are made particular for uncertain systems with a linear structure.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 4; 477-489
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual generator fuzzy identification for automotive diesel engine fault diagnosis
    Autorzy:
    Simani, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/329740.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault detection
    fault isolation
    analytical redundancy
    Takagi–Sugeno fuzzy prototypes
    residual generator fuzzy modelling and identification
    real diesel engine
    detekcja uszkodzeń
    lokalizacja uszkodzeń
    redundancja analityczna
    silnik Diesla
    Opis:
    Safety in dynamic processes is a concern of rising importance, especially if people would be endangered by serious system failure. Moreover, as the control devices which are now exploited to improve the overall performance of processes include both sophisticated control strategies and complex hardware (input-output sensors, actuators, components and processing units), there is an increased probability of faults. As a direct consequence of this, automatic supervision systems should be taken into account to diagnose malfunctions as early as possible. One of the most promising methods for solving this problem relies on the analytical redundancy approach, in which residual signals are generated. If a fault occurs, these residual signals are used to diagnose the malfunction. This paper is focused on fuzzy identification oriented to the design of a bank of fuzzy estimators for fault detection and isolation. The problem is treated in its different aspects covering the model structure, the parameter identification method, the residual generation technique, and the fault diagnosis strategy. The case study of a real diesel engine is considered in order to demonstrate the effectiveness the proposed methodology.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2013, 23, 2; 419-438
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Data-driven techniques for the fault diagnosis of a wind turbine benchmark
    Autorzy:
    Simani, S.
    Farsoni, S.
    Castaldi, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/330715.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault diagnosis
    analytical redundancy
    fuzzy system
    neural network
    residual generator
    fault estimation
    wind turbine benchmark
    diagnostyka uszkodzeń
    redundancja analityczna
    system rozmyty
    sieć neuronowa
    estymacja błędu
    turbina wiatrowa
    Opis:
    This paper deals with the fault diagnosis of wind turbines and investigates viable solutions to the problem of earlier fault detection and isolation. The design of the fault indicator, i.e., the fault estimate, involves data-driven approaches, as they can represent effective tools for coping with poor analytical knowledge of the system dynamics, together with noise and disturbances. In particular, the proposed data-driven solutions rely on fuzzy systems and neural networks that are used to describe the strongly nonlinear relationships between measurement and faults. The chosen architectures rely on nonlinear autoregressive models with exogenous input, as they can represent the dynamic evolution of the system along time. The developed fault diagnosis schemes are tested by means of a high-fidelity benchmark model that simulates the normal and the faulty behaviour of a wind turbine. The achieved performances are also compared with those of other model-based strategies from the related literature. Finally, a Monte-Carlo analysis validates the robustness and the reliability of the proposed solutions against typical parameter uncertainties and disturbances.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2018, 28, 2; 247-268
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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