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Improvement of the vibration diagnostics of rotation shaft damage based on fractal analysis

Bouraou N., Pavlovskyi O., Pazdrii O.

Vibrations in Physical Systems

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2016

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Vol. 27

61--66

EN

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.

2

The Development of Mathematical Model of Gas-Turbine Unit Combustion for Chamber Functioning

Mandryk O. M., Mykhayliuk Y. D.

Geomatics and Environmental Engineering

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2016

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Vol. 10, no. 1

69--78

PL

W artykule przedstawiono podstawowe zagadnienia zwiększenia bezpieczeństwa ekologicznego nowoczesnych stacjonarnych silników turbin gazowych (UTG). Został utworzony matematyczny model komory spalania uwzględniający główne parametry eksploatacji urządzenia. W modelu wykorzystania turbiny gazowej w różnych trybach technologicznych uwzględniono temperaturę powietrza na otworze wlotowym sprężarki osiowej, temperaturę płynu roboczego wlotowych łopatek kierowniczych turbiny i temperaturę środowiska.

EN

This article presents the basic issues of ecological safety improvement of present-day steady-state gas-turbine units. It has been developed the mathematical model diagnostics of combustion chamber considering the basic parameters of gas-turbine unit (GTU) operation under diff erent technological modes including the intake air temperature of the axial-flow compressor, the intake temperature of the actuating medium of the directing set of the high pressure turbine as well as the temperature of the environment.

3

Multilevel vibration control system of aviation gas-turbine engines

Pavlovskiy O., Bouraou N., Iatsko L.

Vibrations in Physical Systems

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2012

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Vol. 25

323--328

EN

This work is devoted to the development a new multilevel vibration control system of aviation gas-turbine engines (GTE). The bases of the new system are: existing aboard vibration control system for current control and awareness about actual levels of vibration at the harmonics of the rotor rotation (main level); complementary dedicated microcontroller for analysis of “normal vibration” in order to predict or detect small damages of engine systems and details (auxiliary level); signal processing methods for damages diagnosis and decision making about GTE condition. The efficiency of the proposed system and using the signal processing methods is demonstrated by the results of computer simulation of the processes of receiving the information about the GTE vibrating condition, transformation and analysis of it at the main and auxiliary levels.