VIBRATION ACTIVITY OF AFTERBURNING TURBOFAN IN OPERATING CONDITIONS

B.B. Korovin, O.N Bylinkina, M.V. Kuzmin

Vibration performance of the afterburning turbofan with intershaft bearing have being examined in high maneuver airplane operating conditions. It is shown that the main sources of the engine vibration activity are high power and low power engine rotors, intershaft bearing, airplane gearbox spring as well as the most engine vibration loading state of flight are the airplane drive away with the maximum mode of engine. Representative for the chosen vibration measurement place and expedience vide range frequency using for vibration analysis have being confirmed. Thus the registration as well as identification not only engine rotors components was succeeded but oscillatory combustion and vibration components that are produced by intershaft elements. Since large number of essential vibration components except first engine rotor harmonics in the frequency range of vibration RMS estimation are presented conclusion have being made about impossibility effective on board engine state vibration monitoring basing only on MRS parameter.

Key word: vibration activity, intershaft bearing, vibration, diagnostic sign, spectrum component, bearing cage, on board vibration monitoring.