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Wyszukujesz frazę "Bouraou, N." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
Decision making about aircraft engine blades condition by using neural network at the steady-state and non-steady-state modes
Autorzy:
Bouraou, N.
Zazhitskiy, O.
Powiązania:
https://bibliotekanauki.pl/articles/329284.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
sieć neuronowa
diagnostyka wibroakustyczna
monitoring
blade
crack-like damage
vibroacoustical condition monitoring
neural network
Opis:
The work is devoted to problem solution of the gas-turbine engines (GTE) blades condition monitoring and diagnosis of the crack-like damages at the steady-state and non-steady-state modes of GTE. It is based on the development of theoretical basis of the vibroacoustical diagnosis methods, the application of the modern signal processing methods and new information technique for decision making. The application of the following signal processing methods: Wavelet-transformation and dimensionless characteristics of the vibroacoustical signals is proved. Neural networks are used for decision making about blades condition by the above mentioned features application. Classification of turbine blade condition was carried out using a two-layer Probability Neural Network (PNN).
Źródło:
Diagnostyka; 2008, 3(47); 71-74
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Vibration condition monitoring of the vertical steel tanks
Autorzy:
Bouraou, N.
Lukianchenko, O.
Tsybulnik, S.
Shevchuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/127953.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vertical steel tank
numerical analysis
stress
deformation
vibration analysis
damping factor
zbiornik stalowy pionowy
analiza numeryczna
naprężenie
deformacje
analiza wibracji
współczynnik tłumienia
Opis:
This paper presents the results of numerical analysis and physical simulation of the vertical steel tank for usage in the vibration condition monitoring system. For purposes of the numerical analysis the tank is considered as the double steel cylinder consisting of the inner and outside shells. The discrete model of a tank is developed. The estimations of stress and deformation are obtained when the following vertical loads are exerting: weight of the fuel, weight of the tank roof and other structural elements or equipment. The physical model of a tank is used for physical simulation. The impulse responses of this model are measured and analyzed for different levels of tank filling. The methods of Prony and Steiglitz-McBride are used for estimation of the vibration damping factor which depends on the level of tank filling.
Źródło:
Vibrations in Physical Systems; 2016, 27; 55-60
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of the crack propagation in welded joint of the tank using multi-class recognition
Autorzy:
Bouraou, N.
Rupich, S.
Lukianchenko, O.
Kostina, O.
Powiązania:
https://bibliotekanauki.pl/articles/127784.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
welded tank
stress
crack propagation
multi-class recognition
neural network classifier
zbiorniki spawane
naprężenie
propagacja pęknięć
sieci neuronowe jako klasyfikatory
Opis:
The numerical analysis of the vertical weld-fabricated steel tank is carried out taking into account the defects of the welds in the form of through-the-thickness cracks of different lengths and numbers, which are located in different zones of the object's ring. The influence of defects on the stress of the tank is estimated in the places of sensors installation under the action of vertical load. The usage of multi-class recognition is proposed by classifier based on Probabilistic Neural Network for monitoring of the crack propagation. Multidimensional vectors of diagnostic features are used for multi-class recognition. The training set of vectors is formed for defect-free and defect conditions, the classifier is trained and tested, the analysis of recognition efficiency is carried out by using the probability of correct multi-class recognition.
Źródło:
Vibrations in Physical Systems; 2018, 29; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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