METHOD FOR DETERMINING OPERATION MODES OF GAS TURBINE ENGINE, IN WHICH AXIAL STRENGTH, ACTING ON RADIAL THRUST BEARING, TAKES MINIMUM AND MAXIMUM VALUES Russian patent published in 2018 - IPC G01M15/14 

FIELD: engines and pumps.

SUBSTANCE: rotation speed of the bearing separator is pre-determined, the dynamic signals from the vibration sensors installed in the axial and vertical directions, are measured. They are converted to amplitude-frequency spectra of axial and radial vibration, a graph of variance of axial vibration amplitude with the rotor rotation speed is constructed versus time. The sections of the graph, in which the increase in the amplitude of the axial vibration is caused by the absence of the influence of the axial force, are not considered. The maximum amplitude of the axial vibration, that corresponds to the maximum value of the axial force, acting on the radial thrust bearing, is determined and the corresponding operation mode of the engine is determined. The sections of the graph, on which the axial vibration is reduced, are selected while in the spectrum of radial vibration, when a rotor speed is set and lowered, a discrete component is searched for a predetermined rotation speed of the bearing separator, the presence of which corresponds to the minimum value of the axial force, acting on the radial thrust bearing, the corresponding operation modes of the engine are determined.

EFFECT: increasing the reliability of the bearing and the engine as a whole, reducing the labour intensity and cost of implementing the method by maintaining an unchanged material part, expanding its use, including engine operation.

5 cl, 4 dwg