Power estimation of the deterministic component of gas turbine engine vibration during balancing

Keywords

periodically non-stationary random process, vibration signal, gas turbine engine, balanced, hidden periodicities, rotor.

Cite as

Yuzefovych R. М., Javorskyj I. М., Torba Yu. І., Sbrodov Ye. V., Lychak O. V., and Komarnytskyi B. R. Power estimation of the deterministic component of gas turbine engine vibration during balancing. Physicochemical Mechanics of Materials. 2025. 61(6), 104-112.

https://doi.org/10.15407/pcmm2025.06.104

Abstract

The spectral composition of the low-frequency (< 2 kHz) component of the vibration acceleration signals of an unbalanced and balanced gas turbine engine at different rotor rotation frequencies is considered. It is shown, that the vibration signals of a gas turbine engine are mixed with power stochastic and deterministic components. At the same time, the spectrum of the vibration signal contains a number of basic deterministic components, the frequencies of which are not multiples of the main rotor frequency of the engine. The detection and analysis of the hidden periodicities of the first order in the signals using the periodically non-stationary random process approach are detected and analyzed. It is shown that the engine balancing leads to a significant decrease in the total power of the deterministic components of the main rotor base frequency of the vibration signal. The power of the deterministic not multiple components of the rotor basic frequency does not decrease during balancing. Indicators are proposed for assessing the state of balancing of gas turbine engines based on the analysis of the power of the deterministic components of the vibration signal.

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