METHOD FOR DIAGNOSTICS OF KIND OF AERO-ELASTIC VIBRATIONS OF WORKING BLADES OF AXIAL TURBO-MACHINE Russian patent published in 2010 - IPC G01M15/14 

FIELD: machine building.

SUBSTANCE: method of diagnostics consists in recording signals from tension sensors on working blades and from sensor of flow pulsations on case of turbo-machine. These signals are multiplied. Further, the signals are converted into frequency spectres. Numbers of diametrical kinds of vibrations and diagnostic frequencies of blade vibrations are determined in the spectre of flow pulsations. Also there are determined coefficients of excitation in a non-stationary signal at frequencies of working blades vibrations in the spectre of flow pulsations and at diagnostic frequencies of these vibrations during their occurrence. There are plotted dependencies of these coefficients on time. Additionally, there are determined time points, whereat values of coefficients of excitation from negative turn to positive, and a kind of aero-elastic vibrations of working blades is defined on them. There are chosen measures for their elimination.

EFFECT: raised efficiency and reliability of diagnostics of turbo-machine working blade vibrations for developing efficient measures of their elimination.

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