Patent ID: 7770458

Claim:
A method of detecting damage to a bearing providing rotary support to at least one rotary shaft of an engine, the method consisting in: a) defining a measurement period corresponding to a range of speeds of rotation of the shaft during renewable activity at low speeds of operation of the engine; b) acquiring over the entire measurement period a vibratory signal representative of acceleration of components of the engine; c) sampling the vibratory signal as a function of the speed of rotation of the shaft during the measurement period; d) transforming the sampled vibratory signal into a frequency signal to obtain frequency spectrum lines as a function of the speed of rotation of the shaft; e) calculating the mean of the amplitudes of the spectrum lines; f) determining amplitude peaks around multiples of the theoretical frequency of a damaged roller; g) calculating the ratio between each amplitude peak and the amplitude level determined for a sound bearing; and h) comparing the ratio that is obtained with at least one predetermined damage threshold.