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Tytuł:
Test Signal Design for Failure Detection: a Linear Programming Approach
Autorzy:
Scola, H. R.
Nikoukhah, R.
Delebecque, F.
Powiązania:
https://bibliotekanauki.pl/articles/908093.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
automatyka
failure detection
large scale programming
failure isolation
bounded perturbations
active detection
Opis:
A new methodology for the design of filters that permits failure detection and isolation of dynamic systems is presented. Assuming that the normal and the faulty behavior of a process can be modeled by two linear systems subject to inequality bounded perturbations, a method for the on-line implementation of a test signal, guaranteeing failure detection, is proposed. To improve the fault detectability of the dynamic process, appropriate test signals are injected into the system. All the computations required by the proposed method are implemented as the solution of large sparse linear optimization problems. A simple numerical example is given to illustrate the proposed procedure.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 4; 515-526
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy diagnostic reasoning that takes into account the uncertainty of the relation between faults and symptoms
Autorzy:
Kościelny, J. M.
Syfert, M.
Powiązania:
https://bibliotekanauki.pl/articles/908470.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
lokalizacja uszkodzeń
logika rozmyta
relacje diagnostyczne
niepewność
fault isolation
fuzzy logic
diagnostic relation
uncertainty
Opis:
Knowledge about the relation between faults and the observed symptoms is necessary for fault isolation. Such a relation can be expressed in various forms, including binary diagnostic matrices or information systems. The paper presents the use of fuzzy logic for diagnostic reasoning. This method enables us to take into account various kinds of uncertainties connected with diagnostic reasoning, including the uncertainty of the faults-symptoms relation. The presented methods allow us to determine the fault certainty factor as well as certainty factors of the normal and unknown process states. The unknown process state factor groups all the states with unknown and multiple faults with the states with improper residual values, while the normal state factor indicates similarity between the observed state and the pattern fault-free state.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 1; 27-35
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault diagnosis of a water for injection system using enhanced structural isolation
Autorzy:
Laursen, M.
Blanke, M.
Düştegör, D.
Powiązania:
https://bibliotekanauki.pl/articles/929918.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza strukturalna
lokalizacja uszkodzeń
diagnostyka uszkodzeń
dopasowanie
structural analysis
fault isolation
fault diagnosis
matching
Opis:
A water for injection system supplies chilled sterile water as a solvent for pharmaceutical products. There are ultimate requirements for the quality of the sterile water, and the consequence of a fault in temperature or in flow control within the process may cause a loss of one or more batches of the production. Early diagnosis of faults is hence of considerable interest for this process. This study investigates the properties of multiple matchings with respect to isolability, and it suggests to explore the topologies of multiple use-modes for the process and to employ active techniques for fault isolation to enhance structural isolability of faults. The suggested methods are validated on a high-fidelity simulation of the process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2008, 18, 4; 593-603
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy-Logic Fault Isolation in Large-Scale Systems
Autorzy:
Kościelny, J. M.
Sędziak, D.
Zakroczymski, K.
Powiązania:
https://bibliotekanauki.pl/articles/908284.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
logika rozmyta
wyodrębnianie uszkodzeń
system na wielką skalę
diagnostics
fuzzy logic
fault isolation
large-scale systems
Opis:
Application of fuzzy logic in fault isolation is proposed. The introduced methods assume the industrial requirements such as integration of different detection algorithms, system complexity, data and knowledge uncertainties. Algorithms of decreasing the calculation expenditures for diagnosing large-scale systems are also introduced. An example of the application is also shown. The proposed technique is a development of the Dynamic State Tables method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 1999, 9, 3; 637-652
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault isolability with different forms of the faults–symptoms relation
Autorzy:
Kościelny, J. M.
Syfert, M.
Rostek, K.
Sztyber, A.
Powiązania:
https://bibliotekanauki.pl/articles/330460.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault diagnosis
fault isolation
symptom sequence
information system
diagnostyka uszkodzeń
lokalizacja uszkodzeń
sekwencja symptomów
system informacyjny
Opis:
The definitions and conditions for fault isolability of single faults for various forms of the diagnostic relation are reviewed. Fault isolability and unisolability on the basis of a binary diagnostic matrix are analyzed. Definitions for conditional and unconditional isolability and unisolability on the basis of a fault information system (FIS), symptom sequences and directional residuals are formulated. General definitions for conditional and unconditional isolability and unisolability in the cases of simultaneous evaluation of diagnostic signal values and a sequence of symptoms are provided. A comprehensive example is discussed.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 4; 815-826
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pełnienie roli męża/partnera życiowego przez mężczyzn odbywających karę pozbawienia wolności jako wyzwanie dla poradnictwa rodzinnego włączonego w proces resocjalizacji
Fulfilling the role of a husband/life partner by men serving prison sentences as a challenge for family counselling in the resocialization process
Autorzy:
Łukaszek, Maria
Powiązania:
https://bibliotekanauki.pl/articles/431464.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
skutki izolacji
więźniowie
resocjalizacja penitencjarna
żony/partnerki więźniów
isolation consequences
prisoners
penitentiary resocialization
prisoners’ wives/life partners
Opis:
W materiale zawarto wyniki projektów (2003 – N = 100 i 2013-2014 – N = 485) zrealizowanych w siedmiu męskich więzieniach podległych Okręgowemu Inspekto-ratowi Służby Więziennej w Rzeszowie. Stwierdzono następujące prawidłowości w relacjach więźniów z żonami/partnerkami: niski odsetek więźniów posiadających żony/partnerki (34-51%); wielokrotne próby stworzenia przez mężczyzn stałej relacji (84-93%), niską trwałość związków (do 3 lat), niedojrzałe motywy wchodzenia w związki – często przypadek, materialne lub emocjonalne korzyści. Badani unikają obowiązków rodzinnych, zmuszają kobiety do współudziału w przestępstwach, stosują wobec nich przemoc – również seksualną, lekceważą zdrowie seksualne kobiet, podejmują współżycie z innymi, w tym prostytutkami. Pomimo tak poważnych problemów w związku więźniowie bardzo dobrze oceniają swoje partnerki, są gotowi kontynuować związek, są przekonani o ich wierności, a także pozytywnie oceniają kontakty seksualne sprzed uwięzienia. Stwierdzono, że w procesie socjalizacji osadzonych wystąpiły czynniki, które mogą w sposób destrukcyjny oddziaływać na pomyślne wypełnianie przez nich roli męża/partnera: wychowywanie się bez jednego rodzica lub obojga rodziców (35%), restrykcyjny model wychowania seksualnego w rodzinie (42%), niekorzystne doświadczenia seksualne. Uwzględniając, że wielu mężczyzn nagannie realizuje rolę męża/partnera życiowego, a izolacja więzienna przyczynia się do rozluźnienia i zerwania więzi z żonami/partnerkami, postuluje się włączyć w proces resocjalizacji poradnictwo rodzinne.
The material describes the results of research conducted in seven male correctional facilities of the Regional Prison Service Inspectorate in Rzeszów (in 2003 N = 100, in 2013-2014 N = 485). On the basis of the research results, the following conclusions on prisoners’ relations with their wives or life partners were drawn: the percentage of prisoners who have wives or life partners is very low (34-51%); prisoners strive for stable relationships but often fail (84-93%); prisoners’ relationships do not last long (up to 3 years); their motives for forming relationships are often immature and they result mainly from a coincidence, material or emotional profits. The interviewees avoid family obligations, force women to commit crimes, they are violent against their female partners (also in sexual contacts), neglect women’s sexual health, have sex with other women and prostitutes. Despite so serious problems in prisoners’ relationships, the respondents evaluate their female partners very well and they want to continue the relationships. Moreover, they are convinced about their partners’ faithfulness and loyalty and they are also very satisfied with their sexual contacts from the period preceding the imprisonment. It was stated that during the process of socialisation, the prisoners experienced some factors that could negatively influence the fulfilment of their role as a husband or life partner. The factors were the following: growing up in a single parent family or without parents (35%), a restrictive model of sex education within family (42%), bad sexual experience such as early sexual initiation age, numerous sex partners, sexual contacts with random and unknown partners, having sex under the influence of psychoactive drugs, using or offering sexual services with the use of sexual violence and avoiding contraception. The research also revealed that many men fulfil their role of a husband or life partner in the righteous way and that prison isolation contributes to loosening the bonds and ending the relationship with their wives and female life partners. Hence, it is recommended that one of resocialization process elements is family counselling.
Źródło:
Dyskursy Młodych Andragogów; 2018, 19; 255-270
2084-2740
Pojawia się w:
Dyskursy Młodych Andragogów
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A data driven fault isolation method based on reference faulty situations with application to a nonlinear chemical process
Autorzy:
Ragot, José
Mourot, Gilles
Kallas, Maya
Powiązania:
https://bibliotekanauki.pl/articles/2172122.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault detection
fault isolation
nonlinear system
data modelling
kernel
wykrywanie uszkodzeń
izolacja uszkodzeń
układ nieliniowy
modelowanie danych
Opis:
The diagnosis of systems is one of the major steps in their control and its purpose is to determine the possible presence of dysfunctions, which affect the sensors and actuators associated with a system but also the internal components of the system itself. On the one hand, the diagnosis must therefore focus on the detection of a dysfunction and, on the other hand, on the physical localization of the dysfunction by specifying the component in a faulty situation, and then on its temporal localization. In this contribution, the emphasis is on the use of software redundancy applied to the detection of anomalies within the measurements collected in the system. The systems considered here are characterized by non-linear behaviours whose model is not known a priori. The proposed strategy therefore focuses on processing the data acquired on the system for which it is assumed that a healthy operating regime is known. Diagnostic procedures usually use this data corresponding to good operating regimes by comparing them with new situations that may contain faults. Our approach is fundamentally different in that the good functioning data allow us, by means of a non-linear prediction technique, to generate a lot of data that reflect all the faults under different excitation situations of the system. The database thus created characterizes the dysfunctions and then serves as a reference to be compared with real situations. This comparison, which then makes it possible to recognize the faulty situation, is based on a technique for evaluating the main angle between subspaces of system dysfunction situations. An important point of the discussion concerns the robustness and sensitivity of fault indicators. In particular, it is shown how, by non-linear combinations, it is possible to increase the size of these indicators in such a way as to facilitate the location of faults.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 4; 635--655
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double fault distinguishability in linear systems
Autorzy:
Kościelny, J. M.
Łabęda-Grudziak, Z. M.
Powiązania:
https://bibliotekanauki.pl/articles/331134.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault isolation
double fault
fault distinguishability
structured residuals
directional residuals
secondary residuals
linear system
lokalizacja uszkodzeń
rozróżnialność uszkodzeń
układ liniowy
Opis:
This paper develops a new approach to double fault isolation in linear systems with the aid of directional residuals. The method of residual generation for computational as well as internal forms is applied. Isolation of double faults is based on the investigation of the coplanarity of the residual vector with the planes defined by the individual pairs of directional fault vectors. Additionally, the method of designing secondary residuals, which are structured and directional, is proposed. These transformations allow achieving various isolation properties. It is shown that double fault distinguishability can be improved by decomposing the observed residual vector along the response directions. The described methods are illustrated with a simple computational example.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 2; 395-406
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance evaluation of the base isolation technique on the blast mitigation of spatial structures
Autorzy:
Gowda Kiran, Kuppalli Krishne
Naroozinejad Farsangi, Ehsan
Powiązania:
https://bibliotekanauki.pl/articles/396460.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
blast mitigation
isolation technique
spatial structures
public buildings
simulation
LRB
łagodzenie skutków wybuchu
technika izolacji
struktury przestrzenne
budynki publiczne
symulacja
Opis:
Unpredictable threat and danger may occur in a structural system due to blast loading. Long-span spatial structures are very practical and common in airport terminals, exhibition centers, stadiums, and other public buildings. For high-rise and multi-story structures, horizontal pressure plays a major role in the level of damage to a structure, whereas long-span structures may be influenced by both horizontal and vertical pressure. In the current study, the applicability of lead rubber bearing (LRB) has been evaluated on a low-rise, long-span structure. The analysis is carried out by using the MATLAB Simulink platform. The simulation results indicate that the base isolation system which is usually adopted for seismic control of structures can adequately reduce the structural responses under blast loadings.
Źródło:
Civil and Environmental Engineering Reports; 2020, 30, 3; 134-160
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter Estimation Based Fault Detection and Isolation in Wiener and Hammerstein Systems
Autorzy:
Janczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/908281.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wykrywanie błędu
wyodrębnienie błędu
estymacja parametryczna
sieć neuronowa
system nieliniowy
fault detection
fault isolation
parameter estimation
neural networks
nonlinear system
Opis:
Fault detection and isolation in Wiener and Hammerstein systems via generation and processing of residual sequences is considered. We assume that some models of the unfaulty Wiener and Hammerstein systems under consideration are known. For Wiener systems, we also assume that their static nonlinear subsystems are invertible. Then, based on a serial-parallel definition of the residual error, new fault detection and isolation methods are proposed.To detect and identify all the changes in both the Wiener and Hammerstein system parameters, the sequences of residuals are processed by using linear regression methods or a neural network approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 1999, 9, 3; 711-735
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supervisory fault tolerant control with integrated fault detection and isolation: a switched system approach
Autorzy:
Yang, H.
Jiang, B.
Cocquempot, V.
Lu, L.
Powiązania:
https://bibliotekanauki.pl/articles/331374.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sterowanie tolerujące uszkodzenia
detekcja uszkodzeń
lokalizacja uszkodzeń
sterowanie rozdzielcze
układ komutowany
fault-tolerant control
fault detection
fault isolation
switching control
switched systems
Opis:
This paper focuses on supervisory fault tolerant control design for a class of systems with faults ranging over a finite cover. The proposed framework is based on a switched system approach, and relies on a supervisory switching within a family of pre-computed candidate controllers without individual fault detection and isolation schemes. Each fault set can be accommodated either by one candidate controller or by a set of controllers under an appropriate switching law. Two aircraft examples are included to illustrate the efficiency of the proposed method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 87-97
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Input reconstruction by means of system inversion: A geometric approach to fault detection and isolation in nonlinear systems
Autorzy:
Edelmayer, A.
Bokor, J.
Szabo, Z.
Szigeti, F.
Powiązania:
https://bibliotekanauki.pl/articles/907385.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
detekcja uszkodzeń
lokalizacja uszkodzeń
układ liniowy
układ nieliniowy
inwersja systemu
fault detection
fault isolation
input reconstruction
linear system
nonlinear system
system inversion
Opis:
In this paper the classical detection filter design problem is considered as an input reconstruction problem. Input reconstruction is viewed as a dynamic inversion problem. This approach is based on the existence of the left inverse and arrives at detector architectures whose outputs are the fault signals while the inputs are the measured system inputs and outputs and possibly their time derivatives. The paper gives a brief summary of the properties and existence of the inverse for linear and nonlinear multivariable systems. A view of the inversion-based input reconstruction with special emphasis on the aspects of fault detection and isolation by using invariant subspaces and the results of classical geometrical systems theory is provided. The applicability of the idea to fault reconstruction is demonstrated through examples.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 2; 189-199
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust MPC for actuator-fault tolerance using set-based passive fault detection and active fault isolation
Autorzy:
Xu, F.
Puig, V.
Ocampo-Martinez, C.
Olaru, S.
Niculescu, S. I.
Powiązania:
https://bibliotekanauki.pl/articles/330788.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault detection
fault isolation
set theoretic method
fault tolerant control
model predictive control
detekcja uszkodzeń
lokalizacja uszkodzeń
sterowanie tolerujące uszkodzenia
sterowanie predykcyjne
Opis:
In this paper, a fault-tolerant control (FTC) scheme is proposed for actuator faults, which is built upon tube-based model predictive control (MPC) as well as set-based fault detection and isolation (FDI). In the class of MPC techniques, tube-based MPC can effectively deal with system constraints and uncertainties with relatively low computational complexity compared with other robust MPC techniques such as min-max MPC. Set-based FDI, generally considering the worst case of uncertainties, can robustly detect and isolate actuator faults. In the proposed FTC scheme, fault detection (FD) is passive by using invariant sets, while fault isolation (FI) is active by means of MPC and tubes. The active FI method proposed in this paper is implemented by making use of the constraint-handling ability of MPC to manipulate the bounds of inputs. After the system has been detected to become faulty, the input-constraint set of the MPC controller is adjusted to actively excite the system for achieving FI guarantees on-line, where an active FI-oriented input set is designed off-line. In this way, the system can be excited in order to obtain more extra system-operating information for FI than passive FI approaches. Overall, the objective of this paper is to propose an actuator MPC scheme with as little as possible of FI conservatism and computational complexity by combining tube-based MPC and set theory within the framework of MPC, respectively. Finally, a case study is used to show the effectiveness of the proposed FTC scheme.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 1; 43-61
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear diagnostic filter design: Algebraic and geometric points of view
Autorzy:
Shumsky, A.
Zhirabok, A.
Powiązania:
https://bibliotekanauki.pl/articles/908458.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
filtr diagnostyczny
system nieliniowy
podejście geometryczne
detekcja uszkodzeń
lokalizacja uszkodzeń
diagnostic filter
nonlinear systems
geometric approach
algebraic approach
fault detection
fault isolation
Opis:
The problem of diagnostic filter design is studied. Algebraic and geometric approaches to solving this problem are investigated. Some relations between these approaches are established. New definitions of fault detectability and isolability are formulated. On the basis of these definitions, a procedure for diagnostic filter design is given in both algebraic and geometric terms.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 1; 115-127
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault detection and isolation with robust principal component analysis
Autorzy:
Tharrault, Y.
Mourot, G.
Ragot, J.
Maquin, D.
Powiązania:
https://bibliotekanauki.pl/articles/929927.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza głównych składowych
odporność
detekcja uszkodzeń
lokalizacja uszkodzeń
principal component analysis
robustness
outliers
fault detection
fault isolation
structured residual vector
variable reconstruction
Opis:
Principal component analysis (PCA) is a powerful fault detection and isolation method. However, the classical PCA, which is based on the estimation of the sample mean and covariance matrix of the data, is very sensitive to outliers in the training data set. Usually robust principal component analysis is applied to remove the effect of outliers on the PCA model. In this paper, a fast two-step algorithm is proposed. First, the objective was to find an accurate estimate of the covariance matrix of the data so that a PCA model might be developed that could then be used for fault detection and isolation. A very simple estimate derived from a one-step weighted variance-covariance estimate is used (Ruiz-Gazen, 1996). This is a 'local' matrix of variance which tends to emphasize the contribution of close observations in comparison with distant observations (outliers). Second, structured residuals are used for multiple fault detection and isolation. These structured residuals are based on the reconstruction principle, and the existence condition of such residuals is used to determine the detectable faults and the isolable faults. The proposed scheme avoids the combinatorial explosion of faulty scenarios related to multiple faults to be considered. Then, this procedure for outliers detection and isolation is successfully applied to an example with multiple faults.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2008, 18, 4; 429-442
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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