DIAGNOSTIC TECHNIQUE FOR TYPE OF OSCILLATIONS OF WORKING BLADES OF AXIAL TURBOMACHINE Russian patent published in 2016 - IPC G01M15/14 

FIELD: engines and pumps.

SUBSTANCE: invention relates to propulsion engineering and power engineering and can be used in development of gas turbine engines, as well as for creation of oscillations diagnostics systems. Before measurement signal to various operating conditions of turbomachine amplitude-frequency characteristics are made at diagnostic frequencies of auto-oscillations and rotating failure, which are loaded into memory of the control system of turbomachine, narrow-band tracking filters are selected according to them and adjusted to diagnostic frequency of auto-oscillations and rotating failure; body vibration is measured by transducer, damping parameters are determined in advance built for preset operating conditions of turbomachine amplitude-frequency characteristics, subharmonic thresholds are determined using amplitude-frequency characteristics and parameters of damping, when the threshold level is achieved by signal amplitude, which is supplied in the bandwidth of filter tuned to diagnostics frequency of auto-oscillations, the presence of auto-oscillations is stated, when the threshold level is achieved by signal amplitude, which is supplied in the bandwidth of filter tuned to diagnostics frequency of rotating failure, presence of a rotating failure is stated.

EFFECT: increase of efficiency and reliability of diagnostics of type of hazardous vibrations of turbomachine impeller.

3 cl, 4 tbl, 6 dwg