METHOD FOR DETECTING DAMAGE IN AT LEAST ONE ENGINE 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.
20 Citations
24 Claims
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1-12. -12. (canceled)
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13. 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 P during which a shaft speed N varies between a low speed and a high speed; b) acquiring over the whole measuring period P a current vibration signal Vc of a mechanical vibration in engine components; c) sampling the current vibration signal Vc during the measuring period P; d) synchronizing the sampled vibration signal with respect to variations of the shaft speed N over the measuring period P; e) converting the sampled and synchronized vibration signal into a frequency signal so as to obtain frequency spectral lines arranged according to the rotation speed N of the shaft; f) calculating the 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 roller bearings of the engine so as to determine potential damages of the roller bearing. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification