DAMAGE DETECTION METHOD, AT LEAST, ONE ENGINE BEARING BEARING

摘要

1. A method for detecting damage to at least one thrust bearing supporting at least one rotating shaft of an engine, characterized in that it comprises the steps of: a) determining (S1) a measurement period P during which shaft N mode changes between low-speed mode and high-speed mode; b) during the entire measurement period P, the current vibration signal (Vc) of the mechanical vibration of the engine components is read (S2); c) during the measurement period P, the current vibration signal is sampled (S3) (Vc ); d) a discrete vibrational signal is synchronized (S4) with respect to changes in the engine N mode during the measurement period P; e) a discrete and synchronized vibrational signal (Vsync) is converted (S5) into a frequency signal to obtain frequency spectral bands ordered by the N rotation mode of the shaft; f ) calculate (S6) the average value of the amplitudes of the spectral bands to obtain the current vibration signature of the engine (Sc); g) calculate (S7) the degree of deviation (Δ) between the current vibration signature of the engine (Sc) and the normal control vibration signature and h) the degree of deviation (Δ) is compared (S8) with the defect indicators of a pre-formed database combining the theoretical damage to the thrust bearings of the engine to determine the potential damage to the thrust bearing. 2. The method of claim 1, wherein the normal control vibration signature is a control vibration signature (Ss) of the engine. The method according to claim 2, in which the normal vibration signature of the engine (Ss) is obtained by calculating the average value of the current vibration signature of the engine,