Method and system for detecting and measuring the disturbances in terms of frequency of the rate of rotation of a rotor
First Claim
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1. A method of detecting variations of a speed (R) of a rotor said method comprising the steps of, in real time:
- measuring signals representative of a march-past of teeth of a measurement device secured to the rotor for a determined duration (T),sampling, digitizing and storing the signals to obtain an initial digital vector (B),extracting from the initial vector (B) a detection signal around a known disturbing frequency (F), wherein said extracting of said detection signal comprises calculating a temporal evolution R(t) of the speed (R) of the rotor, andanalyzing in real time said temporal evolution R(t) comprises applying a Fast Fourier Transform to said temporal evolution R(t),analyzing in real time said temporal evolution R(t) of the speed (R) of the rotor with a bandpass filter of a digital signal processing module, said analyzing further comprising comparing the detection signal with a predetermined threshold and delivering an alert message in the event of overshoot.
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Abstract
A method and system for detecting the variations of speed (R) of a rotor. Signals are measured representative of the march-past of the teeth of a measurement device secured to the rotor for a determined duration (T). The measurements are sampled, digitized and stored to obtain an initial digital vector (B). A detection signal is extracted around a known disturbing frequency (F). The detection signal is compared with a predetermined threshold (SO) and an alert message is delivered in the event of overshoot.
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Citations
12 Claims
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1. A method of detecting variations of a speed (R) of a rotor said method comprising the steps of, in real time:
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measuring signals representative of a march-past of teeth of a measurement device secured to the rotor for a determined duration (T), sampling, digitizing and storing the signals to obtain an initial digital vector (B), extracting from the initial vector (B) a detection signal around a known disturbing frequency (F), wherein said extracting of said detection signal comprises calculating a temporal evolution R(t) of the speed (R) of the rotor, and analyzing in real time said temporal evolution R(t) comprises applying a Fast Fourier Transform to said temporal evolution R(t), analyzing in real time said temporal evolution R(t) of the speed (R) of the rotor with a bandpass filter of a digital signal processing module, said analyzing further comprising comparing the detection signal with a predetermined threshold and delivering an alert message in the event of overshoot. - View Dependent Claims (2, 3, 4, 5, 12)
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6. A system for detecting variations of speed (R) of a rotor, comprising:
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measurement means comprising a sensor delivering in real time signals representative of the a rate of rotation of the rotor, means for signals processing comprising a calculation block calculating in real time the rate of rotation so as, if appropriate, to instantaneously emit a message of disturbance of the speed (R) and delivering a message of abnormal appearance of a disturbance of frequency (F) lower than the frequency of rotation of the rotor, wherein said means for signals processing comprises means for calculating a temporal evolution R(t) of the speed (R) of the rotor and means for analyzing in real time said temporal evolution R(t) of the speed (R) of the rotor, said means for analyzing comprising a bandpass filter, means for analyzing in real time said temporal evolution R(t) comprises means for applying a Fast Fourier Transform to said temporal evolution R(t). - View Dependent Claims (7, 8, 9, 10, 11)
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Specification