Method for detecting damage in at least one engine roller bearing
First Claim
1. A detection method for a damage of at least one roller bearing rotationally supporting at least one rotary shaft of an engine, comprising:
- a) defining a measuring period during which a shaft speed varies between a low speed and a high speed that is higher than the low speed, said low speed and said high speed belonging to a wide range of speeds up to a maximum speed;
b) acquiring over the whole measuring period a current vibration signal of a mechanical vibration in engine components;
c) sampling the current vibration signal during the measuring period;
d) synchronizing the sampled vibration signal with respect to variations of the shaft speed over the measuring period;
e) converting the sampled and synchronized vibration signal into a frequency signal so as to obtain frequency spectral lines arranged according to the shaft speed that is a rotation speed of the shaft;
f) calculating a mean amplitude of the spectral lines so as to obtain a current vibration signature for the engine;
g) calculating a deviation ratio between the current vibration signature of the engine and a healthy reference vibration signature; and
h) comparing the deviation ratio to defect indicators of a predefined database, listing theoretical damages of the at least one roller bearing of the engine so as to determine potential damages of the at least one roller bearing.
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Accused Products
Abstract
A method including acquiring a current vibration signal of an engine component mechanical vibration across a set of a measuring period P of changes in shaft speed N; capturing the signal during the period P; synchronizing the signal relative to the changes in the speed N; transforming the signal into a frequency signal for obtaining frequency spectrum lines arranged according to the speed N; calculating the mean amplitude of the spectrum lines to obtain a current vibration signature for the engine; calculating a deviation ratio between the signature and a healthy reference vibration signature; and comparing the deviation ratio to the defect indicators in a predefined database, listing the theoretical damage to the roller engine bearings so as to determine potential damage to the roller bearing.
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Citations
14 Claims
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1. A detection method for a damage of at least one roller bearing rotationally supporting at least one rotary shaft of an engine, comprising:
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a) defining a measuring period during which a shaft speed varies between a low speed and a high speed that is higher than the low speed, said low speed and said high speed belonging to a wide range of speeds up to a maximum speed; b) acquiring over the whole measuring period a current vibration signal of a mechanical vibration in engine components; c) sampling the current vibration signal during the measuring period; d) synchronizing the sampled vibration signal with respect to variations of the shaft speed over the measuring period; e) converting the sampled and synchronized vibration signal into a frequency signal so as to obtain frequency spectral lines arranged according to the shaft speed that is a rotation speed of the shaft; f) calculating a mean amplitude of the spectral lines so as to obtain a current vibration signature for the engine; g) calculating a deviation ratio between the current vibration signature of the engine and a healthy reference vibration signature; and h) comparing the deviation ratio to defect indicators of a predefined database, listing theoretical damages of the at least one roller bearing of the engine so as to determine potential damages of the at least one roller bearing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification