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US 10,567,254 B2Granted
Method and device for characterising a signal
AssigneeSafran Aircraft Engines
InventorsAlban Lemaitre, Serge Le Gonidec
Life of this patent
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Abstract
A method of characterizing a signal, the method including acquiring a signal; and determining a vibration rating of a portion of the signal; determining a level of variation of a portion of the signal; and determining information characterizing the signal by applying a function that takes as arguments the vibration rating and the level of variation.
Claims12
A method of characterizing a signal produced by acquisition means connected to equipment, the method comprising:
- A) acquiring a signal using the acquisition means;
- B) determining a vibration rating of at least a portion of the signal acquired in step A, the vibration rating being a function solely of rapid fluctuations of the signal, excluding information representing slow variations of the signal, the vibration rating being equal to a normalized value of a vibration content over a time window, the vibration content being extracted by from the signal acquired in step A;
- C) determining a level of variation of at least a portion of the signal acquired in step A, the level of variation being representative of slow variations of the signal, the level of variation being equal to a rate of increase of a quasi-static variation of the signal over the time window during one time step;
- and D) determining information characterizing the signal by applying at least two different functions that combine at least said vibration rating and said level of variation, wherein the quasi-static variation of the signal is equal to a mean value of the signal acquired in step A over the time window.
1 more element
A device for characterizing a signal, the device comprising:
- a data acquisition card which acquires a signal and configured to be connected to equipment;
- and
- circuitry configured to
- determine a vibration rating, suitable for determining a vibration rating of at least a portion of the acquired signal, the vibration rating being a function solely of rapid fluctuations of the signal, excluding information representing slow variations of the signal, the vibration rating being equal to a normalized value of a vibration content over a time window, the vibration content being extracted from the signal;
- determine a level of variation suitable for determining a level of variation of at least a portion of the acquired signal, the level of variation being representative of slow variations of the signal, the level of variation being equal to a rate of increase of a quasi-static variation of the signal over the time window during one time step;
- and
- determine information characterizing the acquired signal and suitable for determining information characterizing said signal by applying at least two different functions combining at least said vibration rating and said level of variation,
- wherein the quasi-static variation of the signal is equal to a mean value of the signal acquired by the data acquisition card over the time window.
5 more elements
Dependencies are inferred from the claim text.