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    Wyświetlanie 1-14 z 14
    Tytuł:
    Application of a Phase Resolved Partial Discharge Pattern Analysis for Acoustic Emission Method in High Voltage Insulation Systems Diagnostics
    Autorzy:
    Kunicki, M.
    Cichoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177912.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic emission
    partial discharge
    transformer diagnostics
    insulation system
    Opis:
    An alternative method for analysis of acoustic emission (AE) signals generated by partial discharges (PD), based on a correlation between voltage phase run and AE pulses, so called phase resolved PD pattern (PRPD), is presented in the paper. PRPD pattern is a well-known analysis tool commonly used in such PD diagnostic methods as conventional electrical and UHF ones. Moreover, it yields various signal analysis abilities and allows a direct correlation indication between measurement results achieved using different methods. An original PRPD measurement methodology applied for AE method as well as some exemplary measurement results and further data analysis capabilities are presented in the paper. Also a comparative analysis of PRPD patterns achieved using various measurement methods and different PD source configurations have been investigated. All presented experiments were done under laboratory conditions using PD model sources immersed in the insulation oil. The main purpose of the presented research is to indicate an all-embracing analytical tool that yields an ability to direct comparison (qualitative as well as quantitative) of the AE measurement results with other commonly applied PD measurement methods. The presented results give a solid fundamental for further research work concerning a direct correlation method for AE and other described in the paper diagnostic techniques, mainly in order to continue PD phenomena analysis and assessment in real life high voltage apparatus insulation systems under normal onsite operation conditions.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 235-243
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variability of the Acoustic Emission Signals Generated by Partial Discharges in Mineral Oil
    Autorzy:
    Kunicki, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/177772.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic emission
    partial discharge
    insulation system
    measurements
    signal processing
    Opis:
    The main purpose of the presented research is to investigate the partial discharge (PD) phenomenon variability under long-term AC voltage with particular consideration of the selected physical quantities changes while measured and registered by the acoustic emission method (AE). During the research a PD model source generating surface discharges is immersed in the brand new insulation mineral oil. Acoustic signals generated by the continuously occurred PDs within 168 hours are registered. Several qualitative and quantitative indicators are assigned to describe the PD variability in time. Furthermore, some longterm characteristics of the applied PD model source in mineral oil, are also presented according to acoustic signals emitted by the PD. Finally, various statistical tools are applied for the results analysis and presentation. Despite there are numerous contemporary research papers dealing with long-term PD analysis, such complementary and multiparametric approach has not been presented so far, regarding the presented research. According to the presented research from among all assigned indicators there are discriminated descriptors that could depend on PD long-term duration. On the grounds of the regression models analysis there are discovered trends that potentially allow to apply the results for modeling of the PD variability in time using the acoustic emission method. Subsequently such an approach may potentially support the development and extend the abilities of the diagnostic tools and maintenance policy in electrical power industry.
    Źródło:
    Archives of Acoustics; 2019, 44, 2; 339-348
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An algorithm for diagnosing injection systems of marine engines
    Autorzy:
    Bejger, Artur
    Drzewieniecki, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/27315912.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    diesel engine
    injection system
    diagnosis
    acoustic emission
    elastic waves
    Opis:
    The article presents the developed methods for diagnosing and analysing signals from injection systems of marine engines. As a source signal, the authors use elastic waves of acoustic emission. The essential fact in the case here considered is that the high frequency of signal from working elements of the injection system comes from a close source directly related to the change of the working parameters of the element (system). Characteristically for elastic waves of acoustic emission, low frequencies (e.g. those from other sources, such as machines in the engine room) are in this case attenuated. Therefore, the proper selection of the method for the analysis allows us accurately diagnose the injection system of a working engine.
    Źródło:
    New Trends in Production Engineering; 2018, 1, 1; 227--233
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis on Acoustic Disturbance Signals Expected During Partial Discharge Measurements in Power Transformers
    Autorzy:
    Kunicki, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/1953519.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic emission
    partial discharge
    insulation system
    measurements
    power transformers
    Opis:
    This paper presents comparative analysis of various acoustic signals expected during partial discharge (PD) measurements in operating power transformer. Main purpose of the paper is to yield relevant and reliable method to distinguish between various acoustic emission (AE) signals emitted by PD and other sources, with particular consideration of real-life results rather than laboratory simulations. Therefore, selected examples of real-life AE signals registered in seven different power transformers, under normal operation conditions, within few years are showed and analyzed. Five scenarios are investigated, which represent five types of AE sources: PD generated by artificial sources, and next four real-life sources (including PD in working transformer, oil flow, oil pumps and core). Several different signal processing methods are applied and compared in order to identify the PD signals. As a result, an energy patterns analysis based on the wavelet decomposition is found as the most reliable tool for identification of PD signals. The presented results may significantly support the process of interpretation of the PD measurement results, and may be used by field engineers as well as other researchers involved in PD analysis using AE method. Finally, observed properties also provide a solid basis for establishing or improving complete classification method based on the artificial intelligence algorithms.
    Źródło:
    Archives of Acoustics; 2020, 45, 4; 733-746
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calibration and Laboratory Testing of Computer Measuring System 8AE-PD Dedicated for Analysis of Acoustic Emission Signals Generated by Partial Discharges Within Oil Power Transformers
    Autorzy:
    Witos, F.
    Szerszeń, G.
    Opilski, Z.
    Setkiewicz, M.
    Olszewska, A.
    Duda, D.
    Maźniewski, K.
    Szadkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177029.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multichannel system
    calibration
    acoustic emission
    partial discharge
    power oil transformers
    Opis:
    In the paper, there are presented a general description of the constructed measuring system 8AE-PD, the results of calibration of this system by the Hsu-Nielsen method as well as the testing of the measuring system during recording signals generated by Hsu-Nielsen sources in a steel plate and a modeled partial discharge (PD) source. There is also presented the methodology of investigations by the calibrated acoustic emission method. The results of analyses of PD signals coming from the modeled sources are given. In particular, there are described the properties of acoustic emission (AE) signals generated by the PDs as well as the dependencies of the peak-to-peak voltage Umm, the RMS voltage Urms and the descriptors of acronyms ADP and ADC on the apparent charge Q introduced by the modeled PD source. There are determined the limit values of the apparent charge Q introduced by the modeled PD source for which the recorded signal is identified as originating from the PDS.
    Źródło:
    Archives of Acoustics; 2017, 42, 2; 297-311
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of Amplitude Distributions of Acoustic Emission Signals Generated in Pressure Vessel During Testing
    Autorzy:
    Witos, Franciszek
    Powiązania:
    https://bibliotekanauki.pl/articles/178028.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic emission
    multichannel measuring system
    amplitude distribution
    descriptors
    pressure vessel
    Opis:
    In the paper, the results of investigations on the properties of acoustic emission signals generated in a tested pressure vessel are presented. The investigations were performed by repeating several Times the following procedure: an increase in pressure, maintaining a given pressure level, a further increase in pressure, and then maintaining the pressure at new determined level. During the tests the acoustic emission signals were recorded by the measuring system 8AE-PD with piezoelectric sensors D9241A. The used eight-channel measuring system 8AE-PD enables the monitoring, recording and then basic and advanced analysis of signals. The results of basic analysis carried out in domain of time and the results of advanced analysis carried out in the discrimination threshold domain of the recorded acoustic emission signals are presented in the paper. In the framework of the advanced analysis, results are described by the defined by the author descriptors with acronyms ADC, ADP and ADNC. Such description is based on identifying the properties of amplitude distributions of acoustic emission signals by assigning them the level of advancement. It is shown that for signals including continoues AE or single burst AE signals descriptions of such registered signals by means of ADC, ADP and ADNC descriptors and by Upp and Urms descriptors provide identical ordering of registered acoustic emission signals. For complex signals, the description using ADC, ADP and ADNC descriptors based on the analysis of amplitude distributions of recorded signals gives the order of signals with more accurate connection with deformational processes being sources of acoustic emission signals.
    Źródło:
    Archives of Acoustics; 2019, 44, 3; 493-503
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the possibility of using acoustic emission for monitoring technical condition of the fuel injector in 3AL25/30 engine
    Autorzy:
    Dudzik, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/27315939.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    emisja akustyczna
    diagnostyka
    monitoring
    wtryskiwacz
    układ paliwowy
    acoustic emission
    diagnostics
    injector
    fuel system
    Opis:
    Acoustic emission method (AE) can be used for the diagnosis of machine parts such as, for example: fuel injectors. This paper presents the methodology and research results of 3AL25/30 engine fuel injector. During research was studied one injector in good condition and second with simulated failure involving closing 2 of 9 holes of the injector tip. Research was carried out on a laboratory test stand using a set of acoustic emission Vallen System. This set included: 4 channel signal recorder AMSY 6, two measurement modules ASIP-2/S, preamplifier with a frequency range 20 kHz-1 MHz and the strengthening of 34 dB, AE signal measurement sensor type VS 150M, with a frequency range 100-450 kHz. During the study, the acoustic emission (AE) generated by tested injector was recorded. The following parameters were determined: amplitude, rise time, duration time, total time, number of events - hits, the effective value of the signal (RMS). Analysis of the results showed significantly longer total time of the injection in the case of damaged injector compared to the injector in good conditions. Signal amplitude was higher, however, the RMS signal reached approximately 3-times lower value for the injector with damaged tip. This means lower quality fuel atomization. Laboratory test results were compared with signals recorded on injectors installed in the engine. Analysis of the signals allowed detection damage of the injector installed in the engine during normal operation.
    Źródło:
    New Trends in Production Engineering; 2018, 1, 1; 419-425
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza pasm częstotliwości sygnału emisji akustycznej zależnych od zjawisk zachodzących we wtryskiwaczu
    Analysis of acoustic emission signal frequency bands dependent on phenomena in an injector
    Autorzy:
    Bejger, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/360269.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    emisja akustyczna
    wtryskiwacz
    układ wtryskowy
    silnik wysokoprężny
    acoustic emission
    injector
    injection system
    diesel engine
    Opis:
    W artykule zaprezentowano wyniki badań określające pasma częstotliwości sygnału emisji akustycznej (EA) związane ze zjawiskami zachodzącymi w układzie wtryskowym silnika wysokoprężnego. Na podstawie analizy czasowo-częstotliwościowej określono gęstość widmową wyznaczoną dla zjawiska lub zachodzących zmian spowodowanych zużyciem bądź uszkodzeniem wybranego elementu wtryskiwacza.
    The presented research results specify the frequencies of an acoustic emission (AE) signal connected with phenomena occurring in the injection system of a diesel engine. From the time-frequency analysis the spectrum density was determined for a phenomenon or changes caused by the wear or damage of a selected injector component.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2008, 14 (86); 5-8
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The reduction in force interaction of wheel with the rail in the curves by means of the automatic control over the locomotive wheel pair position
    Snizhenie urovnja silovogo vzaimodejjstvija koles s relcami avtomaticheskim upravleniem polozheniem kolesnykh par lokomotiva
    Autorzy:
    Ulshin, V.
    Klyuyev, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/793141.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    locomotive
    automated control system
    acoustic emission
    force interaction
    wheel
    railway
    wheel pair
    rail track
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The 8AE-PD computer measurement system for registration and analysis of acoustic emission signals generated by partial discharges in oil power transformers
    Autorzy:
    Witos, Franciszek
    Opilski, Zbigniew
    Szerszeń, Grzegorz
    Setkiewicz, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/220623.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic emission
    partial discharge
    multichannel system
    acoustic signal detection
    acoustic signal processing
    signal analysis
    voltage preamplifier
    Opis:
    A computer measurement system, designed and built by authors, dedicated to location and description of partial discharges (PD) in oil power transformers examined by means of the acoustic emission (AE) method is presented. The measurement system is equipped with 8 measurement channels and ensures: monitoring of signals, registration of data in real time within a band of 25-1000 kHz in laboratory and real conditions, basic and advanced analysis of recorded signals. The basic analysis carried out in the time, frequency and time-frequency domains deals with general properties of the AE signals coming from PDs. The advanced analysis, performed in the discrimination threshold domain, results in identification of signals coming from different acoustic sources as well as location of these sources in the examined transformers in terms of defined by authors descriptors and maps of these descriptors on the side walls of the tested transformer tank. Examples of typical results of laboratory tests carried out with the use of the built-in measurement system are presented.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 403-418
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości aplikacyjne emisji akustycznej do badania układów wtryskowych silników okrętowych
    Possible Applications of Acoustic Emission Signals for Testing Fuel Injection Systems of Marine Engines
    Autorzy:
    Bejger, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/360698.pdf
    Data publikacji:
    2004
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    acoustic emission
    fuel injection system
    fuel injection pump
    injector
    hydraulic effects in high pressure pipe
    EXPLO-SHIP 2004
    Opis:
    Dokonano próby zastosowania sygnałów emisji akustycznej do diagnozowania stanów niesprawności oraz wykrycia źródeł sygnału zachodzących w układzie wtryskowym silników okrętowych. Sygnały emisji akustycznej są zależne od stanu technicznego elementów układu wtryskowego.
    The paper presents the results of acoustic emission signals application for diagnosing defects detecting signal sources in the fuel injection system of marine diesel engines. Changes of acoustic emission signals are sensitive to the working of the injection pump and the condition of injectors. The emitted signals are dependent on their technical condition.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 1 (73); 31-39
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zużycie i możliwość diagnozowania wybranych elementów układu wtryskowego silników okrętowych
    The wear and the possibility of condition monitoring of selected elements of injection system of marine diesel engines
    Autorzy:
    Bejger, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/327678.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    emisja akustyczna
    układ wtryskowy
    zużycie
    silnik wysokoprężny
    silnik okrętowy
    acoustic emission
    injection system
    wear
    diesel engine
    marine diesel engine
    Opis:
    W artykule przedstawiono typowe rodzaje zużycia układu wtryskowego na tle innych układów funkcjonalnych silników okrętowych. Przedstawiono możliwość zastosowania sygnałów emisji akustycznej (EA) do diagnozowania procesu wtrysku. Wykazano, że w częstotliwości około 12 - 16 kHz można wyodrębnić "czyste" sygnały odzwierciedlające pracę wtryskiwacza i układu przepłukania. Częstotliwość rzędu 8 - 16 kHz bardzo dobrze uwidacznia procesy tribologiczne zachodzące w pompie wtryskowej.
    Typical wear cases of fuel injection system, in confrontation with other main functional systems of the marine diesel engine are presented in the paper. The possibility of apply the acoustic emission signals for condition monitoring of injection process and the operation of injection pump and injector are presented. There is shown, that in the frequency of 12 - 16 kHz is possibility to separate signals depended from operation and condition of injector and scavenge. The frequency of 8 - 16 kHz superbly reflect the tribological processes of fuel injection pump.
    Źródło:
    Diagnostyka; 2006, 4(40); 47-50
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alternatywna metoda badań układu wtryskowego okrętowego silnika spalinowego
    Alternative Research Method for the Marine Engine Injection System
    Autorzy:
    Bejger, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/360743.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    emisja akustyczna
    układ wtryskowy
    okrętowe silniki spalinowe
    pompa wtryskowa
    wtryskiwacz
    OMiUO 2005
    acoustic emission
    fuel injection system
    marine diesel engines
    injection pump
    injector
    Opis:
    W artykule zaprezentowano fragment wyników badań ukazujących możliwość wykorzystania emisji akustycznej do diagnozowania układu wtryskowego silnika okrętowego. Za pomocą odpowiedniej obróbki można wyselekcjonować źródła sygnału emisji akustycznej odpowiedzialne za rodzaj występującej w układzie wtryskowym niesprawności.
    This paper introduces the partial results of research, showing possibilities of acoustic emission use to the diagnosis of the fuel injection systems of marine diesel engines. By means of a suitable signal process we can get to the source of acoustic emission signals dependent on varying kinds of faults in the injection system.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2005, 5 (77); 47-54
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical model of energy-related processes in a rotating mechanical system for the purposes of diagnosis of the transmission shafts
    Autorzy:
    Korczewski, Z.
    Marszałkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073621.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    modelling of energy-related processes
    rotating mechanical system
    transmission shaft
    technical diagnostics
    acoustic emission
    modelowanie procesów związanych z energią
    układ mechaniczny rotacyjny
    wał napędowy
    diagnostyka techniczna
    emisja akustyczna
    Opis:
    In the present article, selected problems connected with identification of slowly changing energy-related processes accompanying high cyclic fatigue of construction materials of simple mechanical systems, with special consideration of transmission shafts, are mentioned for diagnostic purposes. The article also presents physical models of object and processes that in a simplified way reflect mechanical energy transmission from transmission engine to ship propeller.
    Źródło:
    Journal of Polish CIMEEAC; 2016, 11, 1; 69--76
    1231-3998
    Pojawia się w:
    Journal of Polish CIMEEAC
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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