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

FIELD: non-destructive testing; gas turbine engines.

SUBSTANCE: invention relates to non-destructive testing of the technical condition of gas turbine engines (GTE). The method for diagnosing the technical condition of a gas turbine engine is to select parameters subject to diagnostic control, the current value of which is measured on the gas turbine engine being diagnosed (P1, P2 … Pn). During engine operation, each of the measured parameters is processed by two channels with different frequency characteristics, channel outputs (P11, P12, P21, P22, …, Pn1, Pn2) are compared with each other and the conclusion that the engine being diagnosed is faulty is made by the magnitude of the difference (ΔP1=P11-P12, ΔP2=P21-P22, …, ΔPn=Pn1-Pn2,). Additionally, the current (nER) and average (nERav) values of the engine rotor speed are determined, as well as the magnitude of their difference (Δ nER=| nER-nERav |), a threshold based on the rotor speed (nERmax) is selected, a time interval τ (τ1, τ2, …, τn) for each of the monitored parameters is selected. If ΔnER exceeds the selected threshold nERmax, then single values of logical signals L (L1, L2, …, Ln), each of which is stored during the corresponding time interval selected for the controlled parameter τ as Δ nER decreases below the threshold nERmax, and with single values of logical signals L, the previously determined values Р11, Р12, Р21, Р22, …, Pn1, Pn2 are assigned equally to the current values of parameters P1, P2 … Pn accordingly.

EFFECT: eliminating the generation of false diagnostic messages when the engine operating mode changes and increasing the accuracy and reliability of the gas turbine engine diagnostic system.

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