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Wyszukujesz frazę "vibration diagnosis" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    On-board vibration diagnostics of shaft damage of the aviation engine
    Autorzy:
    Pavolvskyi, O.
    Bouraou, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/128301.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    gas turbine engines
    cracked shaft
    vibration diagnosis
    digital tracking narrow-band filter
    silniki gazo-turbinowe
    pęknięcie wału
    diagnostyka drganiowa
    filtr wąskopasmowy
    Opis:
    This work is devoted to the further researches and development a new on-board multilevel vibration control system of aviation gas-turbine engines (GTE). We propose to introduce new diagnosis level (subsystem) into development multilevel vibration control system for detection of the initial crack-like damage of rotor shaft. The proposed subsystem works at the non-steady-state modes of GTE, for example during startup at the acceleration to operating speed. The basis of this approach is the fact of the occurrence of sub harmonic resonances of accelerating cracked shaft response. It is necessary to extract the main rotor harmonic vibration at the nonsteady-state mode for crack diagnosis in practice. The narrow-band digital tracking filter is carried out for this aim, the central frequency of pass band is changing according the rotor rotation frequency. The efficiency of the proposed subsystem is demonstrated by the results of computer simulation.
    Źródło:
    Vibrations in Physical Systems; 2014, 26; 229-234
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of the vibration diagnostics of rotation shaft damage based on fractal analysis
    Autorzy:
    Bouraou, N.
    Pavlovskyi, O.
    Pazdrii, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/128311.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    gas-turbine engine
    cracked shaft
    vibration diagnosis
    fractal analysis
    Hurst exponent
    silniki gazo-turbinowe
    pęknięcie wału
    diagnostyka wibracyjna
    analiza fraktalna
    wykładnik Hursta
    Opis:
    This work is devoted to further research and improvement of the vibration diagnostics of the initial crack-like damage of rotation shaft in aviation gas-turbine engines (GTE). We propose to use fractal analysis of the accelerating shaft response in order to increase the damage detection efficiency. Responses of the accelerating shaft are derived by using simulation in absence and in presence of the initial traverse crack. The responses of the cracked shaft have sub-critical peaks; the increase in size of a crack leads to the increase in peak values of the vibration amplitude in the range of sub-harmonic resonances. The Hurst exponent is obtained for the time series in the range of sub-harmonic resonances. The research shows that a small change in the crack size results in considerable change of the Hurst exponent, which allows to detect the mentioned sub-harmonic resonances of the measured signal in order to identify the initial crack-like damage of the rotation shaft.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 61-66
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of selected point estimators of vibration signals for purposes of fault detection in rolling bearings
    Autorzy:
    Krol, Adrian
    Fidali, Marek
    Jamrozik, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2146576.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    vibration
    analysis
    bearings
    defects
    diagnosis
    drgania
    analiza
    łożyska
    uszkodzenia
    diagnoza
    Opis:
    Most of machine breakdowns relate to bearing failures thus it is very important to diagnose bearing conditions. The main purpose of the study was to classify the condition of bearings and identify defective ones based on visual inspection and the values of classic parameters of the acceleration signal vibration, such as Peak, RMS, Kurtosis. The results were compared to parameters provided by the SPM method. All vibration parameters were estimated for high pass filtered signals where filters had following cut-off frequencies 0.5; 1, 2, 5 and 8 kHz. Bearings were tested on the laboratory test bench being built at the Silesian University of Technology. Based on the signal analysis and visual inspections it can be stated that there is agreement in the assessment of the conditions between the parameters of the SPM method and the Peak and RMS parameters. It was observed that the sensitivity to the existence of low-intensity defects increases when the vibration parameters are determined for signals in the band above 2kHz.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020212
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The steam pressure impacts reducing system for a biomass cogenerator based on monitoring of the frequency characteristics of the steam actuator
    Autorzy:
    Lalik, Krzysztof
    Podlasek, Szymon
    Goryl, Wojciech
    Góra, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/128148.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    steam generator
    fault diagnosis
    vibration response
    biomass
    water hammer
    wytwornica pary
    diagnostyka uszkodzeń
    odpowiedź drganiowa
    biomasa
    uderzenie hydrauliczne
    Opis:
    Introduced through policy instruments, as well as due to increase awareness of and demand for energy, alternative, renewable energy sources are becoming increasingly popular and necessary. The growing market and standards are forcing producers of renewable energy sources to constantly improve the quality of their products. Biomass trigenerators are one way of obtaining such energy, both in the form of electricity, heat and cold. These are elements generating steam by burning various solid, liquid or gaseous fuels of organic origin. Rotating machines in the form of turbines or steam engines are used to generate electricity. Unfortunately, they are particularly exposed to steam impacts associated with discontinuous work. This article presents the monitoring and prevention system for such impacts. It is based on the analysis of the frequency spectrum of vibrations of such generators and can be used to implement a trigenerator control system that will reduce the influence of such impacts. With proposed diagnostic system, the efficiency and life span of a Renewable Energy Source can increase significantly.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 2; 1-7
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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