Temat: Expert System - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A framework for the reliability characteristics estimation on the experimental data
Autorzy:: Borowczyk, H.
Lindstedt, P.
Manerowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/242525.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: reliability
experimental data
framework
expert system
Opis:: This paper presents a framework for the reliability characteristics estimation on the experimental data. The framework consists of the set of failures, the experimental data sources, the set of reliability characteristics, the estimation methods, the estimation goodness tests and the expert system supporting estimation and statistical inference processes. The experimental data was obtained with two main theoretical means: control theory and diagnostics. It has been observed that changes of the functioning condition potential could serve to determine the symptoms of transient (momentary) failures and the changes in the potential of the technical condition to determine the symptoms of parametric faults. Such an information is sufficient to calculate reliability characteristics before dangerous catastrophic failures occur and to calculate reliability characteristics for single object without having to deal with a numerous set of objects. The set of reliability characteristics models consists of the analysed failures combination and distribution functions used in the reliability engineering. The set of estimation methods includes analytical and numerical ones. The proposed expert system supporting estimation and statistical inference processes consists of data base (the experimental data), rule base and inferring machine.
Źródło:: Journal of KONES; 2016, 23, 3; 57-63
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Knowledge management system for marine diesel engine diagnosis
Autorzy:: Charchalis, A.
Pawletko, R.
Powiązania:: https://bibliotekanauki.pl/articles/242163.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: knowledge management system
diagnostic expert system
marine diesel engine diagnosis
Opis:: 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.
Źródło:: Journal of KONES; 2011, 18, 2; 77-83
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Aircraft docking guidance system to the gate using fuzzy logic
Autorzy:: Żurawski, P.
Grzesik, N.
Kuźma, K.
Powiązania:: https://bibliotekanauki.pl/articles/243957.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: fuzzy logic
fuzzy expert system
aircraft taxiing
aircraft steering
Opis:: The article presents the concept of automated final process of aircraft taxiing to the gate at the terminal. On the basis of an analysis of the possibilities of aircraft taxiing in civil airports, the authors attempted at optimizing this process. The main objective of the project is to reduce the taxiing time, consequently reducing fuel consumption as well as the rotation time. As a result of the work, the authors designed a controller based on fuzzy logic, which, depending on the initial parameters, calculates the set values for the execution system of aircraft control in the horizontal plane and for the taxi speed. The controller receives two input signals, which determine two output signals. The designed controller allows comprehensive and fully automated aircraft steering. The project relies on data with regard to the apron class D, suited to handle aircraft with a wingspan of up to 52 m and the characteristics of a Boeing 767-200 in speed taxiing and the maximum turn of the nose gear. The measurements of the apron have been adopted in accordance with international regulations in the ICAO DOC 9157 “Aerodrome Design Manual”. The maximum deviation of the nose gear from the centre line was assumed 2.5 m in each direction and a safe distance behind the immobile aircraft equal to 25 m. The length of the Boeing aircraft 767-200 is below 48 m, therefore the input boundary parameters are equal to +/- 2.5 m from the centre line and 80 m from the designated aircraft stand (nose gear). The article presents the project of the controller and its optimization. The authors simulated the controller operation in the package MATLAB “Simulink”. The article ends with data analysis and final conclusions.
Źródło:: Journal of KONES; 2018, 25, 3; 549-556
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Database of expert diagnostic system in the field of turbine blades non-destructive testing
Autorzy:: Borowczyk, H.
Błachnio, J.
Powiązania:: https://bibliotekanauki.pl/articles/246981.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: gas turbine
blade
diagnostics
technical condition
expert system
database
Opis:: The article presents selected problems in the synthesis of the database of expert diagnostic system of gas turbine blades in the field of non-destructive testing. The source of data is optical methods and computed tomography methods. Optical tests can be carried out on the blades of the turbine built in the engine and after their disassembly. Optical tests provide diagnostic information in the form of an image of the blade surface. This makes it possible to identify damage based on changes in the attributes of the image of the blade surface. Computer tomography methods are applied on disassembled blades. Assessment of the technical condition of the blade is made on the basis of individual two-dimensional X-ray scans or on the basis of a three-dimensional image of the blade generated by the computer software from the set of X-ray scans taken during the full angle rotation. The computed tomography data set includes a small number of points on the timeline of operation; hence, the correlation of results with optical methods is difficult. Integration of diagnostic data from two or more sources into one expert system requires standardization of data. One possible approach is the use of multi-valued encoding of 2D and 3D image attributes. In this way a multivalued diagnostic model of the blade is obtained, which can be processed by information theory methods to optimize the set of attributes.
Źródło:: Journal of KONES; 2018, 25, 4; 25-32
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The use of fuzzy expert system for an automatic control of the propulsion system in the aircraft ZLIN 143LSi
Autorzy:: Krok, B.
Grzesik, N.
Kuźma, K.
Powiązania:: https://bibliotekanauki.pl/articles/242523.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: fuzzy logic
fuzzy expert system
propulsion system
aircraft Zlin 143LSi
Opis:: The article discusses the manner of controlling the propulsion system in the aircraft Zlin 143LSi, which is equipped with a piston engine driving a variable-pitch propeller. All the operating procedures are carried out manually by the pilot in accordance with the flight manual. The authors attempted at developing the project of a controller based on fuzzy logic, whose main goal was automating the control system of the propulsion unit, thus lowering the level of difficulty of pilotage, and increasing the economics of the operation. The project was made in an interactive environment FuzzyLogic Toolbox of the MATLAB programme. In the analysis, three input parameters were taken into account, exerting an impact on changing the rotational speed of the propeller: the charging pressure of the propulsion unit expressed in inches of mercury, the speed of the aircraft (TAS) in knots and the angle of attack, at which the flight is made, expressed in degrees. On the basis of the above-mentioned input signals, the rotation speed of the propeller was determined, by changing the blade pitch and the recommended angle of attack for the parameters in order to make an optimal use of the data of the flight conditions. The article presents the project of the controller and its optimization. The authors simulated the controller operation in the package MATLAB “Simulink”. The article ends with data analysis and final conclusions.
Źródło:: Journal of KONES; 2018, 25, 3; 307-314
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Concept of an expert diagnostic system of the turbine engine’s flow path elements
Autorzy:: Błachnio, J.
Borowczyk, H.
Powiązania:: https://bibliotekanauki.pl/articles/241869.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: engine
diagnostics
expert system
knowledge base
silnik
diagnostyka
system ekspercki
baza wiedzy
Opis:: The article presents a concept of an expert diagnostic system of the turbine engine’s flow path (compressor – combustion chamber – turbine) elements. The system adopts diagnostic signals obtained with the use of non-destructive methods implemented on the non-operating engine. The aim is to detect and assess early stages of damage to selected elements of the engine. The achievement of a reliable diagnosis on the condition of the elements requires the application of a set of diagnostic methods and carrying out the inference, including knowledge about the degradation processes of elements and correlation of the diagnostic (signals) tests results obtained with various methods. A convenient tool, which supports solution of such a set problem is an expert system, which on the one hand, makes it possible to organise the existing formal knowledge, and on the other hand – to use non-formal, or even uncertain, knowledge. The presented concept of the expert diagnostic system is based on PC-Shell system of AITECH Polish Company.
Źródło:: Journal of KONES; 2018, 25, 1; 25-32
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Exploitation costs in expert systems
Koszty eksploatacji w systemie ekspert
Autorzy:: Siarkowski, Z.
Hanusz, Z.
Powiązania:: https://bibliotekanauki.pl/articles/243083.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: system ekspertowy
traktory
maszyny
selekcja
koszty eksploatacji
expert system
tractors
machines
selection
exploitation costs
Opis:: Wobec konieczności poszukiwania nowych źródeł energii, coraz częściej rozpatrywane są możliwości wykorzystania roślin do produkcji paliwa. Taki rodzaj produkcji jest możliwy, wymaga jednak starannej analizy kosztów jego pozyskiwania. Analizy mogą być prowadzone przy wykorzystaniu odpowiednich systemów ekspertowych. W pracy przedstawiono problemy związane z wprowadzaniem do systemów ekspertowych dotyczących optymalizacji rolniczego procesu produkcyjnego kosztów eksploatacji ciągników, maszyn i urządzeń. Określono dwa sposoby wyboru najlepszej maszyny (zgodnie z przyjętą funkcją celu) lub urządzenia do ciągnika znajdującego się w gospodarstwie. Po wybraniu odpowiedniego ciągnika i wskazaniu zabiegu technologicznego następuje przeszukanie bazy danych z maszynami i urządzeniami stosowanymi w produkcji zbóż w celu wybrania maszyn lub urządzeń, których zapotrzebowanie mocy jest mniejsze od mocy posiadanego ciągnika. W wyniku działania systemu użytkownik uzyskuje dostęp do zestawienia przedstawiającego wszystkie wyszukane maszyny i urządzenia. Drugi sposób pozwala dobrać ciągnik jak i maszyny lub urządzenia wg wielokryterialnej funkcji celu. Opracowano zależności oraz wykresy trójwymiarowe dla rozsiewaczy nawozów mineralnych, określające związek między jednostkowymi koszty eksploatacji, rocznym wykorzystaniem oraz wydajność agregatu. Kliknięcie na punkt wykresu odpowiadający wybranym wartościom spowoduje, że system przejdzie do prezentacji agregatu bądź agregatów odpowiadających tym warunkom.
In a view of the need to search for new energy sources, opportunities of using the plants for fuel production are more and more often considered. Such type of a production is possible, although it requires a thorough analysis of its achievement costs. These analyses may be performed using appropriate expert systems. The paper presents the issues associated with the introduction of exploitation costs for tractors, machines, and devices into the expert systems related to optimize the agricultural production process. Two ways of selecting the best machine (according to accepted purpose function) or device for a tractor in a farm were presented. After selecting proper tractor and indicating technological process, searching for the database with machines and devices applied at cereal production takes place to select machines or devices power demands of which is lower than that of a tractor possessed. As a result, farmer gains an access to a list presenting all found machines and devices. The other way allows for selecting tractor and machines or devices according to multi-criterion purpose function. Dependencies and 3D plots were worked out for mineral fertilizer spreaders; they define the associations between unit exploitation costs, annual utilization, and aggregate's efficiency. Clicking the point corresponding to selected values would result in presenting given aggregate or aggregates in accordance to selected terms.
Źródło:: Journal of KONES; 2007, 14, 2; 409-414
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Expert system application for improving the manufacturing process for recreational watercrafts modelling yacht propulsion
Autorzy:: Gonciarz, T.
Powiązania:: https://bibliotekanauki.pl/articles/245579.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: expert system
yacht propulsion
manufacturing of yachts
knowledge engineering
system ekspercki
napęd jachtu
produkcja jachtów
inżynieria wiedzy
Opis:: This article deals with the problems of design improvement and the process of production preparation for recreational watercrafts. An original expert system was created to facilitate the design of mechanical equipment systems and to support the production of pleasure boats. This expert system contains information about issues related to the selection of appropriate mechanical equipment used in modern yachts. An expert system is a computer program, which contains information about a specific and usually narrow field of expertise. With the help of this kind of program, it is possible to solve problems on the same level as a human expert. Like most expert systems, this program is built in such a way that the knowledge base is separated from the rest of the system. It contains two main modules: the knowledge base and the inference mechanism. This system provides conclusions in a descriptive form and in the form of numbers, and presents explanations, diagrams, drawings, photos and videos. What is unique about this expert system is that a user with specialist knowledge in the field of yacht engineering can easily modify the knowledge base. With the development of technology, it is easy to feed new information into the system. This system can become a major tool in design offices and plants producing yachts, because it can be easily expanded and adapted to individual needs.
Źródło:: Journal of KONES; 2018, 25, 1; 135-142
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Using fuzzy logic expert system for the estimation of the probability of armour penetration by PGU-14 shells fired from the GAU-8/A CA
Autorzy:: Opala, P.
Grzesik, N.
Kuźma, K.
Powiązania:: https://bibliotekanauki.pl/articles/245144.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: fuzzy logic
fuzzy expert system
armour penetration
GAU-8/A cannon
PGU 14 API shells
Opis:: The article discusses the possibility of armour penetration by PGU 14 API shells fired from the GAU-8/A cannon. The considerations focus on questions with regard to the probability of armour penetration with the initially established conditions in the project. In the analysis, the authors took into account three parameters: armour thickness, armour slope and target distance. Based on the initial parameters, the authors estimated the probability of armour penetration. The designed a fuzzy expert system in the MATLAB software as well as conducting simulation of its performance in the Simulink programmes. The authors presented the performance of the system based on twenty samples for research, which simulate different thickness of the target armour, different distance from the target and different slope of the armour. The authors presented control surfaces, due to which it is possible to analyse the system performance. They also show the simulation process in the Simulink software package with the preset values. On the basis of the created controller, it is clear that a well-developed system, which had undergone testing and optimization, is capable of calculating near reality probability values. The designed system might improve fire effectiveness of ground targets during air training and combat tasks, as well as optimizing the consumption of air-to-ground armour piercing (AP) shells.
Źródło:: Journal of KONES; 2017, 24, 4; 211-218
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A method for estimating propulsion risk of the ship casualty
Autorzy:: Nguyen, N.
Powiązania:: https://bibliotekanauki.pl/articles/242339.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: estimation
expert judgment
risk
ship propulsion system
analytic hierarchy process (AHP)
sea transport
Opis:: Loss of the propulsion function by a ship is one of the most serious categories of hazardous events in sea transport. In specific external conditions it may lead to a loss of ship and environmental pollution. The consequences of propulsion loss by a ship are events classified by the International Maritime Organization as casualties or incidents. The probabilities of occurrence of the former events in a specific time unit constitute the propulsion risk of a ship. Determination of these probabilities is in practice confronted with difficulties connected with shortage of data. A method for estimating the risk caused by loss of a seagoing ship propulsion function is proposed. The estimation is fully based on the expert judgments. Expert is assumed to be well acquainted with the subject he is expected to formulate his judgment on. Expert should also be capable of formulating his judgment. This is connected with level of his education and the language used in the elicitation process, particularly as regards the parameters the expert is expected to estimate. This may be the language of numerical or linguistic values. Numerical values are better but are more difficult to articulate - also errors in judgments are more likely. To overcome this problem and to obtain a more accurate estimation, this study suggests using an analytic hierarchy process (AHP), which quantifies the subjective judgments and confirms the consistency of collected data. An example of the propulsion risk estimation of container carriers operating on the North Atlantic line allows to assess effectiveness of the method.
Źródło:: Journal of KONES; 2013, 20, 2; 315-321
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Interval-valued intuitionistic fuzzy failure modes and effect analysis of the system failure risk estimation
Autorzy:: Nguyen, H.
Powiązania:: https://bibliotekanauki.pl/articles/243789.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: interval-valued intuitionistic fuzzy sets
failure modes
effects analysis
system failure risk estimation
expert judgment
Opis:: Among the risk assessment methods, failure modes and effects analysis (FMEA) is a popular, widely used engineering technique in many areas. It can be used to identify and eliminate known or potential failure modes to enhance reliability and safety of complex systems. In practice, risk estimations encounter difficulties connected with shortage of data. In such cases, we have to rely on subjective estimations made by persons with practical knowledge in the field of interest, i.e. experts. However, in some realistic situations, the decision makers might be unable to assign the exact values to the evaluation judgments due to his/her limited knowledge. In other words, there is a certain degree of hesitancy in human cognition and his/her judgment, who may have insufficient knowledge of the problem domain or uncertainty in assigning the evaluation values to the objects considered. In order to deal with ambiguity and uncertainty in the imperfect information, there have been recently proposed many various such theories as fuzzy sets, interval-valued fuzzy sets, type-2 fuzzy sets, hesitant sets, grey sets, rough sets and intuitionistic fuzzy sets. They have drawn more and more attention of scholars and been adopted in many applications This article addresses the Atanassov’s interval-valued intuitionistic fuzzy sets and FMEA methods in the risk estimation of the system failures based on the expert judgments.
Źródło:: Journal of KONES; 2017, 24, 2; 159-166
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: An application of intuitionistic fuzzy analytic hierarchy process in ship system risk estimation
Autorzy:: Nguyen, H.
Powiązania:: https://bibliotekanauki.pl/articles/244796.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: intuitionistic fuzzy sets
risk estimation
expert judgment
ship propulsion system
analytic hierarchy process (AHP)
sea transport
Opis:: In this paper, we extend the analytic hierarchy process (AHP) method and the Atanassov’s intuitionistic fuzzy set (IFS) into the intuitionistic fuzzy analytic hierarchy process (IFAHP) with application in ship system risk estimation. In the safety engineering, risk estimation is in practice confronted with difficulties connected with shortage of data. In such cases, we have to rely on subjective estimations made by persons with practical knowledge in the field of interest, i.e. experts. However, in some realistic situations, the decision makers might be reluctant or unable to assign the crisp evaluation values to the comparison judgments due to his/her limited knowledge. In other words, there is a certain degree of hesitancy in human cognition and his judgment. Taking advantages of IFSs in dealing with ambiguity and uncertainty into account, the IFAHP can be used to handle with the subjective preferences of experts, who may have insufficient knowledge of the problem domain or uncertainty in assigning the evaluation values to the objects considered. This paper also develops a new knowledge-based ranking method to derive the priority vector of the hierarchy. An illustrative example of the propulsion risk estimation of container carriers operating on the North Atlantic line is given to show the applicability and effectiveness of the proposed method.
Źródło:: Journal of KONES; 2016, 23, 3; 365-372
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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