METHOD FOR MONITORING THE ENGINE SPEED OF AN AIRCRAFT

Abstract: a method for monitoring the engine speed of a rotating machine, includes constructing a raw spectrogram from a vibratory signal; denoising the spectrogram to obtain an equalised spectrogram, the denoising including a first sub-procedure of determining a foot of the spectrogram, the foot of the spectrum being a set of random harmonic components contained in the raw spectrogram, the first sub-procedure including a first sub-sub-procedure of constructing a regression function robust to the peaks of the spectrogram, the regression function being applied to a logarithm of the spectrogram or to the spectrogram; a second sub-sub-procedure of determining the foot of the spectrum from the regression function; a second sub-procedure of determining the equalised spectrogram from the foot of the spectrogram; separating sources in the equalised spectrogram by determining an estimator of the frequencies of interest; determining an instantaneous speed of rotation of the engine speed from the estimator.

Inventor(s): Yasmine HAWWARI, Dany ABBOUD, Yosra MARNISSI, Mohammed EL BADAOUI, Jérôme ANTONI, Hugo ANDRE

CPC Classification: G01M15/14 (Testing gas-turbine engines or jet-propulsion engines)

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