METHOD FOR DIAGNOSING CONDITION OF GAS TURBINE ENGINE Russian patent published in 2024 - IPC G01M15/14 

FIELD: engine building.

SUBSTANCE: invention relates to methods for vibration diagnostics of engine defects during bench tests and can be applied in systems for diagnosing the condition of gas turbine engines for diagnosing contact of the rotor with the stator. In a method for diagnosing the condition of a gas turbine engine, in which the reference critical rotor speeds are determined by preliminary calculation, during bench tests, body vibration is measured from at least two vibration transducers, recorded in the form of an amplitude-frequency spectrum, when a component appears in the diagnostic frequency, a conclusion is made about the presence of a defect, in contrast to the known one, the second reference critical rotor rotation frequency is used as a diagnostic frequency, the calculated value of which is previously clarified experimentally, body vibration is measured using standard vibration transducers in a narrow frequency band limited by filters, including the first rotor harmonic at the maximum rotor speed, at engine operating modes, after passing the reference critical rotor speeds, the frame vibration spectra are analysed, at the moments of the rotor touching the stator, a component appears in the vibration spectrum at a frequency corresponding to the second reference critical rotor speed, based on the presence of which conclusion is made about the contact of the rotor with the stator.

EFFECT: increased efficiency and reliability of diagnosing defects in contact between the rotor and the stator.

1 cl, 2 dwg