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    Wyświetlanie 1-6 z 6
    Tytuł:
    Test signal generation for service diagnosis based on local structural properties
    Autorzy:
    Ungermann, M.
    Lunze, J.
    Schwarzmann, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/331378.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza strukturalna
    generowanie sygnału
    właściwości strukturalne
    structural analysis
    service diagnosis
    active diagnosis
    test generation
    Opis:
    The paper presents a new approach to the generation of test signals used in service diagnosis. The tests make it possible to isolate faults, which are isolable only if the system is brought into specific operating points. The basis for the test signal selection is a structure graph that represents the couplings among the external and internal signals of the system and the fault signals. Graph-theoretic methods are used to identify edges that disappear under certain operating conditions and prevent a fault from changing the system behavior at this operating point. These operating conditions are identified by validuals, which are indicators obtained during the graph-theoretic analysis. The test generation method is illustrated by a process engineering example.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 55-65
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A model-based approach to fault-tolerant control
    Autorzy:
    Niemann, H. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/331380.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie tolerujące uszkodzenia
    architektura sterownika
    diagnostyka uszkodzeń
    fault-tolerant control
    controller architecture
    fault diagnosis
    active fault diagnosis
    controller switching
    Opis:
    A model-based controller architecture for Fault-Tolerant Control (FTC) is presented in this paper. The controller architecture is based on a general controller parameterization. The FTC architecture consists of two main parts, a Fault Detection and Isolation (FDI) part and a controller reconfiguration part. The theoretical basis for the architecture is given followed by an investigation of the single parts in the architecture. It is shown that the general controller parameterization is central in connection with both fault diagnosis as well as controller reconfiguration. Especially in relation to the controller reconfiguration part, the application of controller parameterization results in a systematic technique for switching between different controllers. This also allows controller switching using different sets of actuators and sensors.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 67-86
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active fault diagnosis based on stochastic tests
    Autorzy:
    Poulsen, N. K.
    Niemann, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/929899.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    diagnostyka uszkodzeń
    wykrywanie zmian
    obwód zamknięty
    parametryzacja
    active fault diagnosis
    parametric faults
    stochastic change detection
    closed loop systems
    parametrization
    Opis:
    The focus of this paper is on stochastic change detection applied in connection with active fault diagnosis (AFD). An auxiliary input signal is applied in AFD. This signal injection in the system will in general allow us to obtain a fast change detection/isolation by considering the output or an error output from the system. The classical cumulative sum (CUSUM) test will be modified with respect to the AFD approach applied. The CUSUM method will be altered such that it will be able to detect a change in the signature from the auxiliary input signal in an (error) output signal. It will be shown how it is possible to apply both the gain and the phase change of the output signal in CUSUM tests. The method is demonstrated using an example.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 4; 487-496
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SMAC-FDI: A single model active fault detection and isolation system for unmanned aircraft
    Autorzy:
    Ducard, G. J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331366.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault detection
    fault isolation
    unmanned aerial vehicle
    Kalman filtering
    computationally efficient diagnosis system
    active fault diagnosis
    artificial excitation system
    detekcja uszkodzeń
    lokalizacja uszkodzeń
    bezzałogowiec
    filtracja Kalmana
    diagnostyka uszkodzeń
    układ wzbudzenia
    Opis:
    This article presents a single model active fault detection and isolation system (SMAC-FDI) which is designed to efficiently detect and isolate a faulty actuator in a system, such as a small (unmanned) aircraft. This FDI system is based on a single and simple aerodynamic model of an aircraft in order to generate some residuals, as soon as an actuator fault occurs. These residuals are used to trigger an active strategy based on artificial exciting signals that searches within the residuals for the signature of an actuator fault. Fault isolation is carried out through an innovative mechanism that does not use the previous residuals but the actuator control signals directly. In addition, the paper presents a complete parameter-tuning strategy for this FDI system. The novel concepts are backed-up by simulations of a small unmanned aircraft experiencing successive actuator failures. The robustness of the SMAC-FDI method is tested in the presence of model uncertainties, realistic sensor noise and wind gusts. Finally, the paper concludes with a discussion on the computational efficiency of the method and its ability to run on small microcontrollers.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 189-201
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AKTYWNI OBYWATELE – ANALIZA PORÓWNAWCZA OSÓB DZIAŁAJĄCYCH W ORGANIZACJACH TRZECIEGO SEKTORA W POLSCE
    ACTIVE CITIZENS – A COMPARATIVE ANALYSIS OF PEOPLE WORKING IN THE ORGANIZATIONS OF THE THIRD SECTOR IN POLAND
    Autorzy:
    Masłyk, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/513429.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
    Tematy:
    third sector,
    active citizenship,
    civil society,
    Social Diagnosis
    Opis:
    The degree of citizen participation in Poland as a key factor responsible for the development of third sector organizations is relatively low compared to countries of developed democracy. Despite political, economic or social difficulties, from year to year there is a gradual increase in non-governmental organizations representing the sphere. The purpose of this article is to present the characteristics of active citizens working in various third sector organizations with regard to their socio-demographic profiles. The analysis was performed for the total active people based on data from studies carried out in the 2013Social Diagnosis.
    Źródło:
    Polityka i Społeczeństwo; 2017, 15, 2; 121-138 (18)
    1732-9639
    Pojawia się w:
    Polityka i Społeczeństwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hybrid active fault-tolerant control scheme for wind energy conversion system based on permanent magnet synchronous generator
    Autorzy:
    Tahri, A.
    Hassaine, S.
    Moreau, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/140788.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wind energy conversion system
    active fault-tolerant control
    permanent magnet synchronous generator
    sensor fault diagnosis
    sliding mode observer
    Opis:
    Wind energy has achieved prominence in renewable energy production. There- fore, it is necessary to develop a diagnosis system and fault-tolerant control to protect the system and to prevent unscheduled shutdowns. The presented study aims to provide an experimental analysis of a speed sensor fault by hybrid active fault-tolerant control (AFTC) for a wind energy conversion system (WECS) based on a permanent magnet synchronous generator (PMSG). The hybrid AFTC switches between a traditional controller based on proportional integral (PI) controllers under normal conditions and a robust backstepping controller system without a speed sensor to avoid any deterioration caused by the sensor fault. A sliding mode observer is used to estimate the PMSG rotor position. The proposed controller architecture can be designed for performance and robustness separately. Finally, the proposed methodwas successfully tested in an experimental set up using a dSPACE 1104 platform. In this experimental system, the wind turbine with a generator connection via a mechanical gear is emulated by a PMSM engine with controled speed through a voltage inverter. The obtained experimental results show clearly that the proposed method is able to guarantee service production continuity for the WECS in adequate transition.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 3; 485--497
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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