Wyniki wyszukiwania - BazTech

1

On designing an expert diagnostic system of the aircraft turbine engine functional units

Borowczyk Henryk, Spychała Jarosław

Journal of KONBiN

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2020

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Vol. 50, iss. 1

171--192

EN

The paper presents issues related to the design of an expert diagnostic system of turbine engine functional units. Dedicated diagnostic stations and on-board flight data recorders are the sources of diagnostic signals. The signals were parameterized or identified dynamic models to get a compact representation in the form of a set of parameters. The set of diagnostic parameters was subjected to integer encoding. On this basis, a multi-valued diagnostic model describing the relationship between the set of faults and the set of symptoms (code values of diagnostic parameters) was determined. The proposed approach can be used in the design of expert diagnostic systems for propulsion units of any aircraft.

PL

W pracy przedstawiono zagadnienia związane z projektowaniem ekspertowego systemu diagnostycznego funkcjonalnych zespołów lotniczego silnika turbinowego. Sygnały z dedykowanych stanowisk diagnostycznych oraz pokładowych rejestratorów parametrów lotu poddano parametryzacji oraz identyfikacji modeli dynamicznych w celu uzyskania kompaktowej reprezentacji – zbioru parametrów. Zbiór taki poddano kodowaniu całkowito-liczbowemu. Wyznaczono wielowartościowy model diagnostyczny opisujący relacje między zbiorem uszkodzeń i zbiorem symptomów (kodowych wartości parametrów diagnostycznych). Zaproponowane podejście może być stosowane w projektowaniu ekspertowych systemów diagnostycznych zespołów napędowych dowolnego typu statków powietrznych – bezzałogowych i załogowych.

2

SCOPUS as a meta-source of knowledge about turbine blade damage in the aspect of designing an expert diagnostic system

Borowczyk H., Błachnio J., Spychała J.

Journal of KONBiN

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2017

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No. 43

145--162

EN

The paper presents the concept of using the Scopus as a meta-source of knowledge about turbine blade damage in the aspect of designing an expert diagnostic system. In the first stage, the search was limited to the scope of the general term "turbine engine", followed by a refinement of the search terms within the area of rotary machines components degradation including their construction, manufacturing, repair technology and diagnostic methods. By using EndNote software in semi-automatic mode, specific issue groups have been designated. In the second stage, a query focused on the main causes of turbine blade damage and diagnostic methods was proposed. Using the Scopus-based search and archiving tools, one can systematically update the knowledge.

PL

W artykule przedstawiono koncepcję wykorzystania bazy Scopus jako meta-źródła wiedzy o uszkodzeniach łopatek turbin w aspekcie projektowania ekspertowego systemu diagnostycznego. W pierwszym etapie przegląd publikacji ograniczono do zakresu określonego ogólnym hasłem „turbine engine” a następnie doprecyzowano przeszukiwanie wprowadzając hasła szczegółowe z obszaru degradacji elementów maszyn wirnikowych z uwzględnieniem ich konstrukcji, technologii wytwarzania i naprawy oraz metod diagnozowania. Stosując oprogramowanie EndNote w trybie pół-automatycznym wyznaczono grupy publikacji dotyczących zagadnień szczegółowych co ułatwia wykorzystanie wyników kwerendy w procesie tworzenia ekspertowego systemu diagnostycznego. W drugim etapie zaproponowano kwerendę skoncentrowaną na głównych przyczynach uszkodzeń łopatek turbin oraz metodach diagnozowania. Wykorzystanie zawartych w bazie Scopus mechanizmów przeszukiwania oraz archiwizacji zbioru wyników umożliwia systematyczną aktualizację pozyskanej wiedzy.

3

Knowledge management system for marine diesel engine diagnosis

Charchalis A., Pawletko R.

Journal of KONES

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2011

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Vol. 18, No. 2

77-83

EN

The paper presents the conception of knowledge management system for a diagnostic expert system. Development of knowledge management system is necessary during the construction of the expert system. The most important reason is that knowledge in this system is not a static whole, but is subject to dynamic growth, is modified and updated. Advantages afforded by the creation of diagnostic systems based on knowledge, such as expert systems, compared to traditional diagnostic systems based on closed algorithms were characterized. The conception of knowledge management system established in the diagnostic work associated with the development of expert system for marine diesel engine diagnosis. The main elements of the developed management system are: dictionary editor, rule editor, knowledge assessment module and import and export module. Knowledge management system is also equipped with an electronic form that is used to obtain knowledge from experts, specialists in diesel engines operation. The article presents the tasks and the performance of individual components of the system. The knowledge management system enables integration within a single frame of both information collected from experts and automatically collected one. A doubtless advantage of expert system is the opportunity of updating and developing the content recorded in the database. Due to this feature, the effectiveness of the system may grow during engine operation and facilitate gaining new experience.

4

Problems of practical diagnostics of induction machines in industry

Dybowski P., Rams W., Rusek J.

Electrical Power Quality and Utilisation. Journal

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2008

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Vol. 14, iss. 1

79--84

EN

There are many problems in practical diagnostics of high-power, squirrel-cage induction machines, operated in industrial conditions. These problems make the diagnostics a difficult matter. The problems appear already at the stage of gathering diagnostic signals. The only practically accessible signals are the currents on secondary sides of current transformers monitoring supply currents of separate machines. Due to the proximity of other conductors, carrying high currents, these signals are sometimes accompanied by heavy background noise. The next stage of the diagnostic procedure is off-line analysis of registered signals referring to investigated objects. The main problem at this stage is proper interpretation of gotten results, especially in the cases where determination of the cage state, of investigated machines, is difficult due to ambiguity of diagnostic signals. The ambiguities and doubts by taking diagnostic decision result from that the diagnostic-like signal could be generated not only by cage damage but also by slightly asymmetrically manufactured rotor cage. In such difficult cases, the many-year diagnosing experience is the indispensable precondition for proper diagnostic verdict. The present paper includes some reports on case studies encountered during practical diagnoses of high power, 6kV induction machines, operated in real industrial conditions.