DIAGNOSTIC METHOD FOR TECHNICAL STATE OF GAS TURBINE ENGINE Russian patent published in 2021 - IPC G01M15/14 

FIELD: engines and pumps.

SUBSTANCE: invention relates to nondestructive testing of technical state of gas turbine engines. Method for diagnosing the technical state of a gas turbine engine, comprising: selecting parameters to be monitored, current value of which is registered on diagnosed gas turbine engine. To diagnose gas turbine engine on its any node for the latter, at least two parameters are selected, describing its serviceability and experimentally determining their maximum permissible deviation values for this type of engine. After that during operation of the engine at the current moment in time calculating an average value for each selected parameter in the preceding short and long time periods, with a ratio of the short time period to the long one in interval of 0.002–0.1, and determining their difference. Further, the ratio of the obtained differences to the corresponding maximum tolerable values of the parameters deviations is calculated, and then they are summed, and if the obtained sum of ratios exceeds one, a fault is stated on the diagnosed engine. For gas turbine engine diagnostics by low pressure compressor unit as parameters characterizing its serviceability, selecting the difference between the oil drainage temperature from the turbine support and the oil temperature value at the engine inlet behind the filter, as well as value of oil differential pressure on the filter in common line of oil pumping from engine and value of vibration of intermediate housing of gas generator. Gas turbine engine is subjected to diagnostics at least once a minute.

EFFECT: technical result is expansion of technological capabilities of the method for determining defects affecting serviceability of gas turbine engine units during its operation, detecting faults at early stages and possibility of monitoring engine technical state in dynamics.

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