VIBRATION DIAGNOSTICS METHOD OF BEARINGS SUPPORTS IN GAS-TURBINE ENGINES ON THE ROTAR FREQUENCY PEAK-TO-PEAK AMPLITUDE CHANGE Russian patent published in 2017 - IPC G01M15/14 

FIELD: engines and pumps.

SUBSTANCE: diagnostics method of the bearing assemblies technical condition of a gas turbine engine includes the installation of vibration sensors in the diagnosing section on the motor housing, the measurement of running engine vibration signals and further converting them into an amplitude-frequency spectrum, allocation in the spectrum the low-pressure rotor speed and high-pressure rotor speed, analysis of the resulting spectrum with subsequent determination of the technical condition of bearing assemblies. Diagnostics of the operating engine is performed in the high and low pressure rotors frequency range from 45 Hz to 1000 Hz for a time interval of at least 2 minutes. Additionally, determine the maximum and minimum values of the rotors harmonic amplitudes, the difference between them should be not less than 20%. When having at least five rotors harmonic amplitudes oscillations, the oscillation frequency of which is less than 1 time per 15 seconds and equal period between them, the engine operation is stopped.

EFFECT: invention improves the accuracy of the results in the bearings diagnostics while a part of gas turbine engine.

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