Method and device for monitoring torsional vibrations of a rotary shaft of a turbine engine
First Claim
1. A method of monitoring twisting vibration of a rotary shaft of a turbine engine, the method comprising:
- obtaining a vibratory acceleration signal from an accelerometer located on a stationary component of the turbine engine, this vibratory signal being characterized by a carrier frequency;
evaluating a frequency spectrum of the vibratory signal;
searching for a pair of spectral lines of amplitudes greater than at least a first threshold, the lines being distributed in the spectrum on either side of the carrier frequency of the vibratory signal, and spaced apart therefrom by a twisting frequency of the shaft; and
where appropriate, issuing a warning message.
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Accused Products
Abstract
A method of monitoring twisting vibration of a rotary shaft of a turbine engine includes obtaining a vibratory acceleration signal from a sensor located on a stationary component of the turbine engine. This vibratory signal is characterized by a carrier frequency. The method also includes evaluating a frequency spectrum of the vibratory signal and searching for a pair of spectral lines of amplitudes greater than at least a first threshold. The lines are distributed in the spectrum on either side of the carrier frequency of the vibratory signal, and spaced apart therefrom by a twisting frequency of the shaft. Where appropriate, the method includes issuing a warning message.
17 Citations
10 Claims
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1. A method of monitoring twisting vibration of a rotary shaft of a turbine engine, the method comprising:
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obtaining a vibratory acceleration signal from an accelerometer located on a stationary component of the turbine engine, this vibratory signal being characterized by a carrier frequency; evaluating a frequency spectrum of the vibratory signal; searching for a pair of spectral lines of amplitudes greater than at least a first threshold, the lines being distributed in the spectrum on either side of the carrier frequency of the vibratory signal, and spaced apart therefrom by a twisting frequency of the shaft; and where appropriate, issuing a warning message. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A monitoring device for monitoring twisting vibration of a rotary shaft of a turbine engine, the device comprising:
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obtaining means for obtaining a vibratory acceleration signal from an accelerometer located on a stationary component of the turbine engine, the vibratory signal being characterized by a carrier frequency; evaluation means for evaluating a frequency spectrum of the vibratory signal; search means for searching for a pair of spectral lines of amplitudes greater than at least a first threshold, the lines being distributed in the spectrum on either side of the carrier frequency of the vibratory signal, and spaced apart therefrom by a twisting frequency of the shaft; and issuing means for issuing a warning message activated where appropriate. - View Dependent Claims (8, 9, 10)
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Specification