Information and Diagnostics Systems

Estimation of the Basic Frequencies of the Deterministic Components at Gas-Turbine Engine Vibration Signal

Yevhen Sbrodov1,2, Yuriy Torba1,2, Roman Yuzefovych3,4

1. National University “Zaporizhzhia Polytechnic”, Ukraine
2. Joint-Stock Company Zaporizhzhia Machine-Building Design Bureau “PROGRESS” named after Academician O. H. Ivchenko, Ukraine
3. Karpenko Physico-mechanical Institute of NAS of Ukraine
4. Lviv Polytechnic National University, Ukraine

https://doi.org/10.15407/msse2025.01.272

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Keywords

periodically non-stationary random process; basic frequency; gas-turbine engines; balancing

Abstract

Vibration spectra of gas-turbine engines with balanced and unbalanced rotor are analysed. Random and regular components are divided using the PNRP approach to discover and analyze its hidden periodicity. The engine with unbalanced rotor is characterized by the power for the harmonic with rotation frequency about ten times more than balanced. The indicator for the description of the engine’s rotor state as a ratio of powers of harmonics with basic frequency of the deterministic component is proposed.

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