Wszystkie pola: combustion engine diagnostic - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The diagnostic model proposition of the engine vibration signal
Autorzy:: Komorska, I.
Powiązania:: https://bibliotekanauki.pl/articles/244213.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vibroacoustic model
autoregressive model
combustion engine
valve vibration
Opis:: Vibroacoustic signal of reciprocating engine carries diagnostic information that is not efficiently used because of complicated signal processing methods for separation of useful components and noise elimination. The measured vibrations are a mixture of periodic waves due to the rotating components and transient waves due to the reciprocating components of the engine and pressure forces. Engine vibrations may be described in several ways depend on the diagnostic purpose. For detecting non-uniform cylinder operation, for instance, the methods for rotating machines can be considered. Many transients occur in vibration signal of the combustion engine like exhaust and inlet valve operations, fuel injection, combustion, piston slap. To analyze them the time-frequency methods can be used. Diagnosing of some damages, like valve clearance changing or valve burning, can be done using the diagnostic model. This model should be rather simple and sensitive to mentioned damages. In modelling two approaches can be considered. The first one is based on the real physical parameters of the system. The second one is making the abstractive statistical model of signal with abstractive parameters. In the paper the autoregressive model is proposed. Identifying model is finding periodically time-varying coefficients of the equivalent filter. All the damages in the system make changes of the coefficients. The model presented in the paper is illustrated with the signal of spark ignition combustion engine.
Źródło:: Journal of KONES; 2008, 15, 2; 191-197
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The multidimensional analysis of the combustion engine investigations results with SVD method
Autorzy:: Łukasiewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/246962.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
diagnostic inference
SVD
Opis:: New approach to investigation of combustion engine technical state is vibroacoustics as a diagnostic tool. The main idea of vibroacoustics investigation is following the changes of vibration estimators as a result of engine maladjustment, waste, damages or its failure. Combustion engines technical state diagnostic investigations with use of vibration are very difficult and only few proposed methods could have wider technical use in diagnostics. The combustion engine No. 138C. 2.048 with 1.41. swept capacity, power 55 kW / 75 KM, generally applied to Fiat and Lancia is the investigation objęci. The engine is situated in the investigative laboratory of combustion engines in UTP Bydgoszcz, li makes possible to introduce generated vibration signals as well as the investigation of his adjustment influence on the combustion engine vibration signals change. As a validation of investigation results in this paper is shown presentation of Singular Value Decomposition (SVD) method. The SVD method is the appropriate tool for analysing a mapping from one vector space into another vector space, possibly with a different dimension. Thanks to SVD methods we could decide which symptom given in observation matrix is the best to recognize a set of combustion engine technical state. Relationships cause - consecutive expressing quantitative relation between studied variable symptoms results were qualified using the function of the multiple regression. Introduced in this paper results of investigations are only the part of realized investigative project and they do not describe wholes of the investigative question, only chosen aspects.
Źródło:: Journal of KONES; 2010, 17, 2; 285-292
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Determination of the mechanical power losses of engine-compressor GMVH for diagnostic purposes
Autorzy:: Łutowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/244039.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine-compressor
indicating
MIP
pressure sensors
Opis:: The engine-compressors GMVH types are used in the national gas transmission system in Poland. There is a danger of scuffing of the working components of the engine-compressor particular pistons and cylinders during the process of their exploitation. The growth of resistance in motion parts of the machine is the main symptom of the scuffing. In the cinematic system of the engine-compressor where the engine and compressor are fully mechanically integrated it is impossible to assess the power of mechanical friction without stopping the machine. But if the engine-compressor is equipped with a cylinder pressure measuring system it is possible to determine the indicated power of all compressor and engine cylinders and assess the friction losses as a difference between the sum of the engine 's cylinder s indicated power and the sum of the compressor's cylinders indicated power. In the differential measurements of absolute values measuring errors are accumulated so considerable uncertainty of the measured parameter is expected. The accuracy of the friction power losses assessment method is not sufficient for research purposes. However, despite the expected significant errors, assessed parameters trends observation should allow to detect ofrapid changes of machine technical condition caused by piton scuffing. To ensure the sense of this method a precise measurements and in particular the error consistency of indicated pressure assessment of all cylinders in long time period are necessary. The experience from engine-compressors monitoring and diagnostic system services, the main sources of errors and methods for their minimization are described in the paper.
Źródło:: Journal of KONES; 2010, 17, 3; 279-286
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A method of engines’ diagnosis in operationA method of engines’ diagnosis in operationA method of engines’ diagnosis in operation
Autorzy:: Sitnik, L.J.
Sroka, Z. J.
Wróbel, R.
Powiązania:: https://bibliotekanauki.pl/articles/245541.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
combustion engine
engine diagnostic
diagnostic methods
engine technical conditions
Opis:: It was found that there are discrepancies between the values of diagnostic parameters obtained in the test and natural exploitation. In addition, no appropriate tests are carried out which would be based on the degree of engine degradation in long-term natural use. One of the reasons is the lack of adequate, non-invasive diagnostic methods. The aim of the work was to show the possibility of creating a new diagnostic parameter of combustion engines in their natural operation. The parameter can be determined by a new method (presented in the article). The method is based on the assumption that the technical condition of the engine can be judged on the basis of the run-up curve, and in particular, on the basis of the linear direction coefficient, which is approximated by the points of the run-up curve at particular moments of the run-up. An additional requirement is that the points of the run-up curve are the average value of the speed from many runs. In addition, the statistical distributions of the speed values in the individual moments of the run-up should be of the same type. The direction coefficient of the straight line determined is a diagnostic parameter. The value of the new coefficient is the value of the straight-line factor. Further works are underway to determine the relationship between the directional coefficient and the technical condition of the engine.
Źródło:: Journal of KONES; 2018, 25, 3; 403-410
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Wavelet transform in vibroacoustic diagnostic of machines
Autorzy:: Haller, Piotr
Jankowski, Antoni
Kaźmierczak, Andrzej
Wróbel, Radosław
Powiązania:: https://bibliotekanauki.pl/articles/244246.pdf
Data publikacji:: 2019
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: DSP
wavelet
LDV
combustion engine
Opis:: This article discusses the use of wavelet decomposition in the diagnostics of vibrometric signals of an engine. Apart from presenting the possibility of using wavelets in diagnostics, the authors take up the subject of the applicability range of processing for stationary signals, which until now has been reserved for non-stationary signals. A unified definition of signal stationarity has been proposed, which is not based on statistics. The authors presented methods of wavelet decomposition of a vibrometric signal of combustion engine vibrations, measured with the use of LDV (Laser Doppler Vibrometry). Laser measurements allows for studying an object without 'touching' its housing. Basing on the relative velocity of engine vibrations, the authors indicate how reliable vibrations are in diagnostics. Despite higher costs, this measurement method gives better results (for specific cases) than acoustic studies. Transform – wavelet decomposition is a solution hardly ever used in machine diagnostics; it is more often applied in medicine and image recognition. The authors presented the differences that can be obtained for different levels of decomposition, and also presented the impact on the engine condition assessment through the use of filtering (windowing) the signal before decomposition.
Źródło:: Journal of KONES; 2019, 26, 1; 47-55
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Investigation of the dynamic properties of engine fan titanium rotor blades in a high manoeuvrability aircraft in FOD aspect
Autorzy:: Szczepanik, R.
Powiązania:: https://bibliotekanauki.pl/articles/244435.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: aircraft
combustion engines
turbine engines
engine diagnostic
blades
Opis:: A current problem concerning the use of military and civilian aircraft is the damage caused to turbine compressor blades by ‘foreign objects’. Here the term ‘foreign objects’ means small stones, pieces of metal, cement pitch, asphalt, etc., left on runways and taxiways. Foreign objects also include ice and iced lumps of snow as well as birds sucked into aircraft engine air ducts. All such objects pose a serious threat to proper engine operation. They are very harmful in two respects. One is the direct danger during flight when a bird or some other object is sucked into the engine. The other danger is in what might occur in later flights if the engine, especially the compressor and turbine blades, are not inspected for durability reassessment. This paper presents an analysis of how the size and distribution of defects on blade edges affect, the frequencies and fatigue strength of titanium blades in the first four stages of a high manoeuvrability jet engine fan (low pressure compressor). In particular, damaged high manoeuvrability aircraft fan stage rotor blades and measured natural vibration frequencies and logarithmic decrement of damping of high manoeuvrability aircraft fan titanium blades are presented in the paper.
Źródło:: Journal of KONES; 2013, 20, 2; 371-376
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Diagnostic of malfunction of four stroke marine engine using harmonic components of combustion pressure waveforms
Autorzy:: Drewing, S.
Dereszewski, M.
Powiązania:: https://bibliotekanauki.pl/articles/241605.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: technical diagnostics
marine engines
FFT
harmonic components
combustion pressure
Opis:: The paper presents results of experimental measurements and analysis of combustion pressure and fuel pressure in high-pressure line before fuel valve. The aim of conducted experiments was detection of failures of high-pressure fuel system. Both pressure signals were recorded simultaneously and subsequently processed using FFT decomposition of obtained wavelets. The idea of comparison of both fuel and gas pressures came after observations of occurrence changes of wavelets form of fuel high pressure, probably caused by malfunction of injector's sprayer. The engine from test bed is very well armoured with sensors, what enable observations of fuel and combustion pressure in real time. Unfortunately, such equipment is very unlike in real objects, what created un idea to find out whether run of combustion pressure wavelet reflects fuel pressure deviations and whether is possible to detect such kind of deviations in way of decomposition of indicated pressure wavelet. Experiment was carried out in laboratory of Gdynia Maritime University, using medium speed diesel engine. Simulation of malfunctions of fuel valve was obtained by installation of specially prepared spraying nozzles. All measurements were carried out at reference load of 75% of MCR (Maximum Continuous Rating). In order to get reliable results and avoid errors due to omitting outer atmospheric conditions, registrations were repeated several times, in days characterized by different temperature and atmospheric pressure.
Źródło:: Journal of KONES; 2018, 25, 2; 97-103
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Probability measures of likelihood of diagnosis of the technical state of main combustion engines of sea-going ships
Autorzy:: Girtler, J.
Powiązania:: https://bibliotekanauki.pl/articles/242346.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
diagnostic system
likelihood of diagnosis
theory of semi-Markov processes
Opis:: The paper presents reasons for the need of discerning the notions: likelihood of diagnosis and rightness of diagnosis while taking operating decisions. A probability formula for establishing the right diagnosis has been derived as a likelihood measure of diagnosis. For deriving the formuła, the theory of semi-Markov processes and Bayes' formula of the conditional probability have been applied. Other probability measures of likelihood of diagnosis have been also presented. These measures concern the technical state of such important systems as combustion engines of sea-going ships. However, they can be of use also for other ship systems. The paper provides description of a stochastic decision situation following from operation of combustion engines in any operating system and on this background there is presented some proposals of applying the technical diagnostics for controlling the engine operating process. Formulating a problem for the combustion engines, solving the problem, diagnostic inference and likelihood of diagnosis as well a simplified model of combustion engine operation taking into account diagnosis and control in time of operation are presented in the paper.
Źródło:: Journal of KONES; 2009, 16, 2; 125-132
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analysis of diagnostic utility of instantaneous angular speed fluctuation of diesel engine crankshaft
Autorzy:: Dereszewski, M.
Charchalis, A.
Polanowski, S.
Powiązania:: https://bibliotekanauki.pl/articles/244646.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: two-stroke diesel engine diagnostics
diagnostics of combustion process
angular speed variation
angular acceleration
moving approximation
Opis:: Frequent crew rotation, a shorthand, and various levels of technical crew skills, are the facts with the ship-owners has to cope very often. Having the proper level of engine exploitation as a main objective is necessary to implement a constant engine monitoring system, in order to obtain quick and reliable diagnostic information. One cannot omit the financial aspect of monitoring system implementation, created by its price and costs of service. In this paper, the analysis of diagnostic utility of the signal deriving from a propulsion shaft fluctuation during its one revolution is presented. The angular speed of the shaft was measured using a laser sensor of torque meter ETNP-10. Diagnostic utility validation has been verified on a basis of combustion quality, in cylinders of two-stroke, turbocharged Marine Diesel Engine. Test was carried out on board of a container vessel during its sea passage. In order to evaluate the effectiveness of the method, the crew simulated engine’s malfunction by fuel injection cut-off in various cylinders (only one in the same time).The interference signals decomposition was carried out using the method of synchronous averaging and moving approximation with polynomial of 3rd exponent.
Źródło:: Journal of KONES; 2011, 18, 1; 123-128
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Analyses of temperature and pressure condition in CI engines exhaust pipe in light of application NOx sensor to determine of catalytic converter efficiency
Autorzy:: Rychter, M.
Powiązania:: https://bibliotekanauki.pl/articles/243619.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
internal combustion engine
catalytic converter
diagnostic system
Opis:: The development of a catalytic converter required an analysis of selected physical parameters of the supports. This resulted from the necessity to assume given parameters of the supports applied in the tests in exhaust gas environment in the CI engines. An analysis of ionic conductors, which constitutes the basic solution in voltage sensors providing signals through NOx electrocatalysis, is presented. The aim of this paper is to determine the basis for the monitoring of catalytic converters in compression ignition engines by the emission level of a selected exhaust gas component as a diagnostic signal. The emission of NOx has been taken as the basis. This required the development of a specialized system allowing the reduction of NOx and obtaining of a diagnostic signal reflecting the level of the said reduction. This paper includes same results of testing and possibilities monitoring of prototype catalytic converter on the test bed. On the basis of the performed examinations and obtained test results the following conclusions can be drawn: the analysis of the NOx concentrations in exhaust gas from the compression-ignition engine can be based on the indications of the voltage probes with the modified electrodes of the oxygen pump, the application of the reduction conditions in the voltage probes using the nitrogen oxides reduction by the electro-catalytic way depends on the exhaust gas parameters, the values of which change depending on the rotational crankshaft speed and engine load, and for this reason obtaining the diagnostic signal for the whole engine operation range is impossible, the control of the correctness of the catalyst operation regarding the nitrogen oxides reduction can be realised for the defined operating parameters of the tested engine, for phases VIII and X of the ESC test the reheating the test probe installed before the catalyst was unnecessary, owing to the high exhaust gas temperature (737-759°C).
Źródło:: Journal of KONES; 2008, 15, 3; 451-463
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Spatial-phase selection of diesel engine vibroacoustic signal for piston slap diagnostic
Wykorzystanie selekcji przestrzenno-fazowej (kątowej) sygnału WA w diagnozowaniu złożenia tłok-cylinder silnika ZS
Autorzy:: Flekiewicz, M.
Madej, H.
Wojna, G.
Powiązania:: https://bibliotekanauki.pl/articles/243183.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
silniki spalinowe
proces spalania
drgania
analiza falkowa
combustion engines
combustion processes
modelling
boundary level
Opis:: Influence of piston skirt clearance on engine noise has been presented in this paper. Traces of forces producing engine block vibrations, i.e. gas force, and piston slap force were estimated and verified with real sampled data. An analysis procedure, using spatial-phase selection has been developed for the analysis of internal combustion engine noise signals. An engine block vibration signal decomposition was also carried on, what enabled the identification of the influence of piston clearance on wavelet factor values C(a,b). It has been proved that increasing piston skirt clearance, delays the response of engine body on piston slap. The diagnostics of the combustion engine with the WA methods is especially difficult for the occurrence of many sources vibrations, what causes mutual disturbing of symptoms of damages. Because in diagnostics process, the different methods of the selection of the useful signal are applied. For estimation of the engine state, the spatial and phase selection have been utilized among other things influence ofpropagation direction of vibrations on the value of symptoms from combustion process and piston slab into the cylinder wall. On the ground of carried experimental research using methods of the signal decomposition in domain of time and frequency, measures of the vibrational signal sensitive on the degree of the waste of the composition the piston-the cylinder have been designated.
W artykule przedstawiono próbę oceny zużycia (stanu) złożenia tłok-cylinder za pomocą sygnału drgań rejestrowanego na kadłubie i głowicy silnika ZS we wzajemnie prostopadłych kierunkach. Obiektem badań był jednocylindrowy silnik spalinowy ZS. Podczas badań oprócz sygnałów przyspieszeń drgań rejestrowano przebieg ciśnienia w komorze spalania oraz położenie GMP. W silniku spalinowym w jego cyklu roboczym pojedyncze zdarzenia występują w określonej sekwencji, a ich powtarzalność w każdym następnym cyklu powoduje, że rejestrowany sygnał drganiowy jest cyklostacjonarny. Diagnostyka silnika spalinowego metodami WA jest szczególnie utrudniona ze względu na występowanie wielu źródeł drgań, co powoduje wzajemne zakłócanie symptomów uszkodzeń. Dlatego w procesie diagnozowania stosuje się różne metody selekcji sygnału użytecznego. W pracy do oceny stanu silnika wykorzystano selekcję przestrzenną i fazową określając m. in. wpływ kierunku propagacji drgań na wartość symptomów wywołanych procesem spalania oraz uderzeniem tłoka w ściankę cylindra. Na podstawie przeprowadzonych badań eksperymentalnych stosując metody dekompozycji sygnału w dziedzinie czasu i częstotliwości wyznaczono miary sygnału drganiowego wrażliwe na stopień zużycia złożenia tłok-cylinder.
Źródło:: Journal of KONES; 2007, 14, 2; 133-144
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Knowledge acquisition for marine diesel engine diagnosis
Pozyskiwanie wiedzy dla potrzeb diagnozowania okrętowego silnika spalinowego
Autorzy:: Pawletko, R.
Powiązania:: https://bibliotekanauki.pl/articles/244833.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: systemy ekspertowe
silniki spalinowe
pozyskiwanie wiedzy ekspertowej
diagnostyka techniczna
combustion engines
expert knowledge acquisition
technical diagnostic
expert systems
Opis:: W artykule przedstawiono koncepcję systemu diagnostycznego okrętowego silnika tłokowego opartą na modelu systemu ekspertowego. Zrealizowano pozyskiwanie wiedzy diagnostycznej, opracowano bazę wiedzy oraz zaproponowano ogólną strukturę systemu. Wiedza dla ekspertowego systemu diagnozowania silnika okrętowego została pozyskana od ekspertów (specjalistów w dziedzinie eksploatacji) oraz z diagnostycznych baz danych. Do pozyskiwania wiedzy od ekspertów zastosowano wywiad kwestionariuszowy. Grupę ekspertów stanowili doświadczeni oficerowie mechanicy floty handlowej. Podjęto próbę pozyskania podstawowej wiedzy z dziedziny eksploatacji silników obejmującą relacje diagnostyczne, umożliwiające ocenę stanu technicznego. Pozyskiwanie wiedzy z baz danych przeprowadzono z wykorzystaniem indukcyjnych metod uczenia maszynowego. Dane uczące dla algorytmów indukcji zostały zgromadzone w wyniku realizacji eksperymentu czynnego na silniku Sulzer 3Al 25/30. Porównano wyniki klasyfikacji stanów silnika uzyskane za pomocą algorytmów LEM2 oraz MODLEM. Oceny jakości działania poszczególnych klasyfikatorów dokonano techniką 10-fold cross validation. Badane algorytmy automatycznej indukcji, mogą być wykorzystywane do pozyskiwania wiedzy z baz danych, dla potrzeb diagnostycznego systemu ekspertowego.
In the paper conception of marine diesel engine diagnostic system based on expert system model was presented. The first stage of research relevant to knowledge acquisition for this system was done, knowledge data set was built and general structures of the expert system was proposed. Basic sources of knowledge, which can be used for construction of knowledge data set, are also identified. The basic knowledge related to the diesel diagnostic was undertaken from experts and diagnostic data base. The paper questionnaire was used to the knowledge acquisition from experts. The basic knowledge related to the marine diesel exploitation was undertaken. Those expert knowledge covers the weakness point of engine, the kind of faults and diagnostic relation between faults and their symptoms. The group of experts was contained the experienced merchant navy officers. The rule induction algorithms were used to knowledge acquisition from database. During the experiment efficiency of LEM induction algorithms was compared to new MODLEM algorithms. Training and test data were acquired from experiment on marine engine Sulzer 3AL 25/30. 10-fold cross validation method was used to estimation classification efficiency for different rule induction algorithms. Tested automatic induction algorithms can be used for knowledge acquisition from diagnostic data base for marine diesel engine diagnostic system.
Źródło:: Journal of KONES; 2008, 15, 4; 471-477
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Knowledge acquisition from database for marine diesel engine diagnosis
Pozyskiwanie wiedzy z baz danych dla potrzeb diagnozowania okrętowego silnika spalinowego
Autorzy:: Charchalis, A.
Pawletko, R.
Powiązania:: https://bibliotekanauki.pl/articles/245763.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diagnostyka techniczna
systemy ekspertowe
silniki spalinowe
pozyskiwanie wiedzy ekspertowej
technical diagnostic
expert systems
combustion engines
expert knowledge acquisition
Opis:: This article presents an attempt to use inductive machine learning methods to knowledge acquisition from the databases for the purpose of marine diesel engine diagnostic 's expert system. The existing methods of acquiring knowledge based on Information about the exploitation of technical objects stored in databases was characterizes. The selected machine learning methods was used to obtain the relationship in the form of diagnostic rules. The results obtained with algorithms LEM2, MODLEM and EXPLORE was compared. MODLEM algorithm allows the use of numerical data directly without having to pre-discretization. Learning examples stored in the diagnostic database was obtained as a result of the active experiment, carried out on laboratory Sulzer engine 3AL 25/30. During the experiment the damages of the turbocharging system, fuel injection system and combustion chamber was simulated. Only the elementary states (single damage in the same time) in a variable load were included. 10-fold cross validation techniąue was used for evaluation of the obtained rules classifiers. The obtained diagnostic rules have also been assessed in substantive terms, including an analysis of the relationship between disability states and received symptoms. Used machine learning techniques can be used for automatic knowledge acquisition for the diagnostic expert system.
W artykule przedstawiono próbę wykorzystania indukcyjnych metod uczenia maszynowego, do pozyskania wiedzy z baz danych dla potrzeb ekspertowego systemu diagnozowania okrętowego silnika tłokowego. Scharakteryzowano istniejące metody pozyskiwania wiedzy na podstawie informacji o przebiegu eksploatacji obiektów technicznych zapisanych w bazach danych. Zastosowano wybrane metody uczenia maszynowego do uzyskania relacji diagnostycznych w postaci reguł. Porównano wyniki uzyskane za pomocą algorytmów LEM2, MODLEM oraz EXPLORE. Algorytm MODLEM umożliwia wykorzystanie bezpośrednio danych numerycznych bez konieczności stosowania dyskretyzacji wstępnej. Przykłady uczące zapisane w diagnostycznej bazie danych uzyskano w wyniku realizacji eksperymentu czynnego, przeprowadzonego na silniku laboratoryjnym Sulzer 3AI 25/30. Podczas eksperymentu symulowano wybrane uszkodzenia układu wymiany czynnika roboczego, układu wtryskowego oraz komory spalania. Uwzględniono tylko stany elementarne (pojedyncze uszkodzenia w tym samym czasie) w warunkach zmiennego obciążenia. Oceny sprawności uzyskanych klasyfikatorów regułowych dokonano techniką 10-fold cross validation. Uzyskany zbiór reguł diagnostycznych został również poddany ocenie merytorycznej, obejmującą analizę związków pomiędzy diagnozowanymi stanami niezdatności a uzyskanymi symptomami. Wykorzystane techniki uczenia maszynowego mogą zostać zastosowane między innymi do automatycznego pozyskiwania wiedzy dla potrzeb systemu ekspertowego.
Źródło:: Journal of KONES; 2009, 16, 4; 37-42
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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