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    Wyświetlanie 1-12 z 12
    Tytuł:
    The Application of Selected Hierarchical Clustering Methods for Classification the Acoustic Emission Signals Generated by Partial Discharges
    Autorzy:
    Borucki, Sebastian
    Łuczak, Jacek
    Lorenc, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/2097707.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic emission method
    acoustic signals
    partial discharges
    power transformer
    clustering method
    Opis:
    The paper presents the results of the application of the hierarchical clustering methods for the classification of the acoustic emission (AE) signals generated by eight basic forms of partial discharges (PD), which can occur in paper-oil insulation of power transformers. Based on the registered AE signals from the particular PD forms, using a frequency descriptor in the form of the power spectral density (PSD) of the signal, their representation in the form of the set of points on plane XY was created. Next, these sets were subjected to analysis using research algorithms consisting of selected clustering methods. Based on the suggested numeric performance indicators, the analysis of the degree of reproduction of the actual distribution of points showing the particular time waveforms of the AE signals from eight adopted PD forms (PD classes) in the obtained clusters was carried out. As a result of the analyses carried out, the clustering algorithms of the highest effectiveness in the identification of all eight PD classes, classified simultaneously, where indicated. Within the research carried out, an attempt to draw general conclusions as to the selection of the most effective hierarchical clustering method studied and the similarity function to be used for classification of the selected basic PD forms.
    Źródło:
    Archives of Acoustics; 2021, 46, 3; 409-417
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using Clustering Methods for the Identification of Acoustic Emission Signals Generated by the Selected Form of Partial Discharge in Oil-Paper Insulation
    Autorzy:
    Borucki, S.
    Łuczak, J.
    Zmarzły, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/177657.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic emission method
    acoustic signals
    partial discharges
    insulation
    power transformer
    Opis:
    The article presents the results concerning the use of clustering methods to identify signals of acoustic emission (AE) generated by partial discharge (PD) in oil-paper insulation. The conducted testing featured qualitative analysis of the following clustering methods: single linkage, complete linkage, average linkage, centroid linkage and Ward linkage. The purpose of the analysis was to search the tested series of AE signal measurements, deriving from three various PD forms, for elements of grouping (clusters), which are most similar to one another and maximally different than in other groups in terms of a specific feature or adopted criteria. Then, the conducted clustering was used as a basis for attempting to assess the effectiveness of identification of particular PD forms that modelled exemplary defects of the power transformer’s oil-paper insulation system. The relevant analyses and simulations were conducted using the Matlab estimation environment and the clustering procedures available in it. The conducted tests featured analyses of the results of the series of measurements of acoustic emissions generated by the basic PD forms, which were obtained in laboratory conditions using spark gap systems that modelled the defects of the power transformer’s oil-paper insulation.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 207-215
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnosis of the Non-Concurrent Operation of the On-Load Tap Changer Contacts by the Acoustic Emission Method
    Autorzy:
    Cichoń, A.
    Borucki, S.
    Boczar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/177044.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power transformer
    on-load tap changers
    acoustic emission method
    Opis:
    On-load tap changers (OLTC) are some of the main transformer elements that make voltage adjustment in a power network possible. Their failures often cause shutdowns of distribution transformers. The paper presents research work aimed at the assessment of the technical condition of OLTCs by the acoustic emission method (EA). This method makes the OLTC diagnosis possible without the need of disconnecting the transformer from the system. The measurements were taken in laboratory conditions. The influence on the operation non-concurrence of the power tap changer contacts on the AE registered signals has been investigated. The signals registered were subjected to analyses in the time and time-frequency domains. The result analysis in the time domain was carried out using the Hilbert transform and calculating characteristic times for the particular runs. A short-time Fourier transform was used for the assessment of results in the time-frequency do- main.
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 823-830
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic emission signals associated with prebreakdown state in air high voltage insulating systems
    Autorzy:
    Dobrzycki, A.
    Opydo, W.
    Zakrzewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/97311.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    high voltage insulating system
    breakdown voltage
    acoustic emission method
    dielectric coatings
    Opis:
    The paper presents the method of acoustic emission (AE) in the study of the state of insulation systems with air as the high-voltage insulation. The tested object was a planar system of electrodes made of aluminum. In addition, the analysis of AE signals and the impact on these signals the presence of dielectric coating on the electrode surfaces of aluminum was tested. We examined the influence of saturation (seal) these coatings on the dielectric strength of the insulation system. The study was conducted at an air pressure values 1·105, 3·105 and 5·105 Pa. The strength of the electrical systems were tested at alternating voltage with a frequency of 50 Hz. Noted pros and cons of using the method of EA in the context of the assessment of high-voltage electric insulation devices. The presented results confirm the possibility of using acoustic emission method, not only for identifying vulnerable areas, but also to predict the time of of further use of high voltage device.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 278-286
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Durability and wear of engine parts – new methods of testing of alloys and composites
    Autorzy:
    Ranachowski, Z.
    Pawełek, A.
    Jasieński, Z.
    Piątkowski, A.
    Kudela Jr., S.
    Lewandowski, M.
    Mazuruk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/360606.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Diesel engines diagnostics
    light alloys and composites
    Common Rail fuel system
    Acoustic Emission method
    Opis:
    The paper deals with the problems related to the diagnostics of selected parts of modern Diesel engines. The evolution of mechanical properties of four alloys of Mg-Li-Al system and four composites made on the base of the alloys mentioned above, caused by variation of its composition was presented. The Acoustic Emission (AE) method applied to monitoring of degradation of mechanical properties of the alloys and composites was described. Moreover, the results of the investigation of failures occurring in the injectors of Common Rail Diesel engines performed with the application of AE method were also reported.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 35 (107); 125-131
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of operating conditions on the strength and frequency of destruction of fibre-cement composites
    Wpływ warunków eksploatacyjnych na wytrzymałość i częstotliwości niszczenia kompozytów cementowo-włóknistych
    Autorzy:
    Adamczak-Bugno, Anna
    Krampikowska, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/1852563.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kompozyt cementowo-włóknisty
    elewacja wentylowana
    metoda emisji akustycznej
    wytrzymałość na zginanie
    fibre-cement composite
    ventilated façade
    acoustic emission method
    bending strength
    Opis:
    The paper examines the impact of possible operational factors on strength and frequency parameters generated by bending of fibre-cement panels. The tests were performed on elements cut out of a standard commercially available panel. The samples were exposed to factors described as environmental (soaking in water, bath-drying cycles, freeze-thawing cycles) and unique (flame ignition and high temperature exposure) and then subjected to three-point bending tests. Acoustic emission (AE) signals were acquired during the external load application. After the measurements were completed, the strength of individual elements was determined and the frequencies generated during bending were calculated. The obtained results were analysed statistically. Comparing the results obtained for a group of samples subjected to environmental and unique factors, significant differences between them were noted. It was noted that the decrease in the strength of the samples is related to the emission of lower frequency sounds. It was found that the application of the presented methodology allows to determine the condition of the fibre-cement boards in use.
    W artykule przedstawiono wyniki testów trzypunktowego zginania dla elementów włóknisto- cementowych poddanych działaniu czynników środowiskowych i wyjątkowych z jednoczesną akwizycją sygnałów AE. Analizie poddano wartości wytrzymałości na zginanie oraz częstotliwości generowanych przed momentem zniszczenia. Na podstawie otrzymanych wyników wyciągnięto następujące wnioski: Obniżenie wytrzymałości elementów włóknisto-cementowych wiąże się z generowaniem niższych częstotliwości przy zginaniu w odniesieniu do próbek o niezmienionych parametrach mechanicznych. Zastosowanie metody emisji akustycznej umożliwia śledzenie częstotliwości powiązanych z powstawaniem różnego rodzaju zmian w strukturze materiału. Przebieg procesu niszczenia struktury płyty cementowo-włóknistej jest mechanizmem złożonym i powiązanym w sposób ścisły z obecnością włókien zbrojących oraz stopniem wiązania pomiędzy zbrojeniem a matrycą. Częstotliwości generowane przez zmiany zachodzące w strukturze włókno-cementu są ściśle powiązane z obecnością zbrojenia w postaci włókien oraz stopniem wiązania między zbrojeniem a matrycą. Zastosowanie techniki emisji akustycznej umożliwia skuteczne wykrywanie i monitorowanie inicjacji zmian w strukturze wpływających na obniżenie parametrów mechanicznych płyt. Otrzymane rezultaty dają możliwość zastosowania metody AE do oceny stanu pełnowymiarowych elementach cementowo-włóknistych.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 67-83
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex Measurement System for Enhancement of Capability for Marine Engines Diagnostics
    Autorzy:
    Charchalis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116855.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Marine Engines Diagnostics
    Complex Measurement System
    Exploitation Decision Aid System
    marine diesel engine
    mechanical engineering
    Technical Diagnostic Laboratory
    Vibroacoustics
    Acoustic Emission Measurement Method
    Opis:
    Modern way of machines’ exploitation, due to their high level of structural complication, requires proper level of supervising. That supervising is generally based on detection of pre-failure states and evaluation of machines’ single elements or components condition. In the frame of development of the research capacity of the Mechanical Faculty of Maritime Academy in Gdynia, has been developed the Exploitation Decision Aid System for marine engines exploitation. The system was based on existing test bed with the marine diesel engine Sulzer AL 25/30 as a core element. Modernization of the measurement equipment, significantly extended research capacity, what resulted with improvement of quality, extension of the span, and acceleration of conducted research and development works in the domain of safety of exploitation and diagnostics of marine power plants. Investments in modern measurement apparatus enables also an extension of the range of research and expertise related to engines’ failures and pollutants emission, in relation to broad spectrum of implemented fuels. The goal has been achieved in way of modernization of engine’s monitoring system and stands in Technical Diagnostic Laboratory.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 3; 415-420
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The feasibility assessment of the exibition hall after the fire
    Ocena przydatności do użytkowania hali wystawienniczej po pożarze
    Autorzy:
    Kossakowski, P.
    Piotrowski, J. Z.
    Świt, G.
    Trąmpczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/402238.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    pożar
    odporność ogniowa
    konstrukcje
    ocena przydatności do użytkowania po pożarze
    metoda emisji akustycznej
    fire
    fire resistance
    structures
    feasibility assessment after fire destruction
    acoustic emission (AE) method
    Opis:
    The article presents the feasibility assessment and evaluation of technical conditions of basic structural elements of exhibition hall after the fire. The aim of this investigation was to develop the ways for further exploitation of the structure and to evaluate the extent of repairs to be done.The scope of investigation and the detailed methodology for the investigation is presented. Given is the impact of the fire load on the bearing capacity of structural elements. To asses the impact of the damages on the main load bearing beams, besides the standard tests, also the acoustic emission (AE) method was applied.
    Źródło:
    Structure and Environment; 2010, 2, 2; 20-28
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recognition of pick wear condition based on Grey-Markov chain model
    Autorzy:
    Zhang, Qiang
    Zhang, Jiayao
    Powiązania:
    https://bibliotekanauki.pl/articles/2200890.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    pick wear
    vibration acceleration signal
    acoustic emission signal
    Grey-Markov method
    Opis:
    An attempt is made in this paper to solve the pick wear problem of mining machinery and propose a pick wear degradation model based on the Grey-Markov chain by using generated characteristics signals and certain pick wear parameters to enhance the prediction accuracy. The vibration and acoustic emission signals generated during the catting pick are extracted and analyzed. The energy and the value of the characteristic signal are obtained by wavelet analysis to construct a characteristic sample library of the signals. Two kinds of signals are applied to the model to analyze the error between the real and the predicted values. The model prediction results demonstrate a 1.43% error of the vibration signal, 1.64% error of the acoustic emission signal with 98% prediction accuracy, thus offers a new method for monitoring the pick wear of mining machinery.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 289--303
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation and optimization of waveguide geometry for acoustic emission signals
    Autorzy:
    Skalsky, V.
    Serhiyenko, O.
    Selivonchyk, T.
    Tolopko, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/329154.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    emisja akustyczna
    metoda elementów skończonych
    strata energii
    temperatura
    falowód
    acoustic emission
    finite elements method
    waveguide
    energy losses
    temperature distribution
    Opis:
    Optimization of geometrical sizes of the waveguide of elastic acoustic emission (AE) waves, which is used in the search of hydrogen induced cracking during thermal cycling of structure alloys in a gaseous hydrogen environment, is considered. A waveguide is considered as on acoustic system that has the discrete spectrum of eigenfrequencies. Distribution of temperature field along the waveguide is calculated, decay of elastic AE waves is estimated. Basing on the obtained results the design implementation of the waveguide is carried out.
    Źródło:
    Diagnostyka; 2009, 1(49); 3-6
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study of Identifying Emission Sources of Acoustic Signals on the Cylinder Body of a Two-Stroke Marine Diesel Engine
    Autorzy:
    Dong, Xuan Thin
    Nguyen, Manh Hung
    Powiązania:
    https://bibliotekanauki.pl/articles/1953513.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic emission
    two-stroke marine diesel engine
    experimental method
    low-to-high frequency ranges
    medium-to-high frequency ranges
    vibration
    Opis:
    In this paper, an experimental method was utilized to investigate acoustic emission (AE) characteristics and to identify emission sources of the nonlinear AE signal on the cylinder body of a large low-speed two-stroke marine diesel engine in real-working conditions on the sea in misfiring and normal firing modes. Measurements focused on the AE signal acquired in a transverse direction in low-frequency (20-80 kHz), medium-frequency (100-400 kHz) and high-frequency (400-900 kHz) ranges. The collected signals were analyzed on the crank angle and crank angle-frequency domains. The results showed that all potential sources of the nonlinear AE signal could be mapped in the low-frequency range. However, only the AE signal caused by the combustion process at around the top dead center could be well-observed in the medium-to-high-frequency range. The findings also revealed that in normal firing conditions, the AE energy radiated by friction in the down-stroke period was smaller than in the up-stroke process due to gas-sealing forces. Moreover, the AE energy in the misfiring condition was higher than in the normal firing state. These outcomes considerably contributed understandings to characteristics of friction and wear around the mid-stroke area of the cylinder on a two-stroke marine diesel engine.
    Źródło:
    Archives of Acoustics; 2021, 46, 1; 105-119
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The acoustic emission (AE) controlling method of the electric sheet blanking process – a comparative study of selected data mining methods
    Autorzy:
    Kochański, Andrzej
    Czyżewski, Piotr
    Moszczyński, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/29520061.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    acoustic emission
    data acquisition
    data preparation method
    visualization method
    process duration
    process speed
    punching
    manufacturing
    Andrews curves
    PCA
    LDA
    tSNE
    Sammon Mapping
    emisja akustyczna
    pozyskiwanie danych
    metoda wizualizacji
    czas trwania procesu
    szybkość procesu
    uderzenie
    produkcja
    krzywe Andrewsa
    mapowanie Sammona
    Opis:
    The article presents an experimental stand to assess the state of punch in the process of sheet blanking. Blanking trials were carried out on an eccentric press. During all the trials, there were recorded signals of acoustic emission (AE) that accompanied the process of blanking. For the recorded AE signals, the methodology of data preparation and analysis was presented. On that basis, the results of the assessment of the state of the punch were presented, and they employed five methods of visualization: Andrews curves, Principal Components Analysis, Linear Discriminant Analysis, a modified method of Stochastic Neighbor Embedding and Sammon Mapping. The aim of the work was to assess the possibility of using visualization methods to predict the condition of the tool on the basis of acoustic emission signals in processes carried out in extremely short times.
    Źródło:
    Computer Methods in Materials Science; 2022, 22, 4; 189-200
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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