METHOD FOR DETERMINING PERIODICITY GAS TURBINE ENGINE PART CONTROL Russian patent published in 2018 - IPC G01M15/14 

FIELD: motors and pumps.

SUBSTANCE: invention relates to the field of operation and diagnostics of aircraft gas turbine engines and can find application in the methods for determining the periodicity of control of parts of aircraft gas turbine engines (GTE) by means of an eddy current method for detecting subsurface defects. Eddy current method is used as a non-destructive testing method, while in the method, before the beginning of the investigation, the notched parts are selected by the parameters of the eddy current transducer, for this purpose, flat samples with different sizes of subsurface cracks are first produced, the thickness of the flat specimen should be no more than the thickness of the investigated part in the contact zone, planar samples are examined by an eddy current transducer with different frequency, determine the frequency of an eddy current transducer, at which the ratio of the useful signal to the signal from the interference is more than two, and the maximum depth of the subsurface crack is determined, on which it is detected, further, the component is scanned with a notch eddy-current converter with a different shape of the contact surface of the eddy current transducer, the shape of the eddy current transducer is selected, at which the subsurface crack is detected at the maximum depth of occurrence, the part with a notch is loaded according to the accelerated and operational cycles, and the dependence of the crack size on the number of loading cycles of a part with a notch is determined, and then the periodicity of the control is determined.

EFFECT: technical result of the claimed invention is the development of a criterion and a technique for determining the minimum detectable defect by the method of nondestructive testing, suitable for use in operation, as well as a reasonable increase in the reliability of the control due to the guaranteed detection of a defect in the operation of the product as per the technical condition prior to the destruction of the controlled part, increase in the customer's engine performance by reducing the cost of operating costs by setting the maximum possible control periodicity.

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