METHOD FOR DIAGNOSING SELF-EXCITED VIBRATIONS OF WORKING WHEEL OF TURBO-MACHINE (VARIANTS) Russian patent published in 2007 - IPC G01M15/14 

FIELD: aviation engines engineering, power engineering, possible use during strength finishing of compressors of gas-turbine engines during stand tests and during operation, and also for creating systems for diagnosing self-excited vibrations, both for use in aviation and power engineering.

SUBSTANCE: in accordance to first variant, in the method for diagnosing self-excited vibrations of working wheel of turbo-machine as dynamic parameter body vibration is used and change of dynamic frequency is tracked. Moment of appearance of self-excited vibrations is recorded on achievement of given value of relation of change of body vibration at diagnostic frequency to change of frequency of rotation of working wheel. To confirm resulting information, moment of appearance of self-excited vibrations is evaluated on basis of appearance in the spectrum of body vibration of component with native frequency of vibrations of blades. Measurement of body vibration is performed by measuring transformers (sensors), mounted in standard mounting spots. In accordance to second variant, in the method for diagnosing self-excited vibrations of working wheel of turbo-machine, body vibration is used as dynamic parameter and change of diagnostic frequency is tracked. Moment of appearance of self-excited vibrations is recorded on achievement of limit value by body vibration at diagnostic frequency, appropriate for limit value of strain in blade. For confirmation of resulting information about moment of appearance of self-excited vibrations, moment of appearance of component with native frequency of vibrations of blades in spectrum of body vibrations is used. Measurement of body vibration is performed by measuring transformers (sensors), mounted in standard mounting spots.

EFFECT: increased efficiency and reliability of method, ensuring possible usage of it in real time mode to detect and prevent dangerous strains in blades in timely manner; possible diagnostics in vibration spectrum of component with native frequency of blade vibrations, which serves as confirmation of appearance of self-induced vibrations.

2 cl, 2 ex