Method of detecting damage to an engine bearing
First Claim
1. 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.
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Accused Products
Abstract
The invention relates to a method of detecting damage in a bearing supporting at least one rotary shaft of an engine in rotation, the method consisting in: 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; acquiring over the entire measurement period a vibratory signal representative of acceleration of components of the engine; sampling the vibratory signal as a function of the speed of rotation of the shaft during the measurement period; 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; calculating the mean of the amplitudes of the spectrum lines; determining amplitude peaks around multiples of the theoretical frequency of a damaged roller; calculating the ratio between each amplitude peak and the amplitude level determined for a sound bearing; and comparing the ratio that is obtained with at least one predetermined damage threshold.
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Citations
5 Claims
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1. A method of detecting damage to a bearing providing rotary support to at least one rotary shaft of an engine, the method consisting in:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification