FIELD: measurement equipment.
SUBSTANCE: diagnostics method of the technical state of inter-rotor bearing of two-shaft gas turbine engine (GTE) involves measurement of vibration signals in steady-state rotation mode of high pressure rotor (HPR) of not less than 90% of its maximum rotation speed, recording of vibration signals from GTE housing structures with their further conversion to amplitude-frequency spectrum, allocation in that spectrum of separating frequency of inter-rotor bearing and rotation speeds of low pressure rotor (LPR) and HPR with further determination of available defect of inter-rotor bearing. In order to improve diagnostics reliability of the state of inter-rotor bearing of two-shaft gas turbine engine, precipitation and propagation of a defect is determined upon achievement of value of amplitude level of separating frequency of not less than 2 mm/s and not more than half of the amplitude level of LPR and HPR rotation speed that is maximum as to amplitude, and availability of propagated defect is determined upon achievement of the value of amplitude level of the separating frequency of not less than 2 mm/s and more than half of the amplitude level of LPR and HPR rotation speed that is maximum as to amplitude, at simultaneous occurrence of difference frequencies (n2-fc) and/or (fc-n1), and/or (2*fc-n1), and/or (2*fc-n2), and/or (2*n1-fc), which stand out clearly out of the noise level, where n1 - LPR rotation speed (Hz), n2 - HPR rotation speed (Hz), fc - separator rotation speed (Hz).
EFFECT: early detection of defects during GTE manufacture, operation, maintenance or repair.
3 cl, 5 dwg
