Envelope enhancement system for detecting paper machine press section anomalous vibration measurements
First Claim
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1. In a paper machine felt press section, a fault detection system, comprising:
- a sensor to sense signals representative of vibrations from said press;
a feature extracting circuit having at least one band pass filter for receiving said signals and for separating and passing a limited predetermined range of harmonic frequencies from a small amplitude impulse perturbation in said signals indicative of a selected fault in said press, and an enveloping circuit to substantially square said signals passed by said band pass filter to enhance said small amplitude impulse perturbation; and
an analyzer for receiving said signals from said enveloping circuit and indicating said selected fault in said press.
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Abstract
A vibration detecting and condition monitoring system for the press section, including felts, rollers and presses, employing a feature extracting circuit having a selectable plurality of Bessel type bandpass filters and an enveloping circuit to square the bandpassed signal output prior to FFT analysis of the signal. The system enables the enhancement and detection of highly impulsive signals in the frequency domain, that are indicative of defects in machinery operation.
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Citations
21 Claims
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1. In a paper machine felt press section, a fault detection system, comprising:
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a sensor to sense signals representative of vibrations from said press; a feature extracting circuit having at least one band pass filter for receiving said signals and for separating and passing a limited predetermined range of harmonic frequencies from a small amplitude impulse perturbation in said signals indicative of a selected fault in said press, and an enveloping circuit to substantially square said signals passed by said band pass filter to enhance said small amplitude impulse perturbation; and an analyzer for receiving said signals from said enveloping circuit and indicating said selected fault in said press. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for detecting faults in paper machine press sections, comprising:
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sensing vibrations in a press section of a paper machine; producing a signal representative of said sensed vibrations; filtering said signal to separate a predetermined range of harmonics from a small amplitude repetitive impulse perturbation therein indicative of a selected fault in said press section from other low frequency components in said signal; and analyzing said impulse perturbation to determine the nature of said fault in said press section. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. Apparatus for detecting faults in a paper machine press section, comprising:
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means for sensing vibrations in the press section of a paper machine; means for producing a signal representative of said sensed vibrations; means for filtering said signal to separate a train of harmonics of small amplitude repetitive impulse perturbations in a selected frequency range indicative of a selected fault in said press section and to distinguish said perturbations from other low frequency components of said signal; and means for analyzing said impulse perturbations to determine the nature of said fault in said press section.
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16. Apparatus for detecting faults in a paper machine press section, comprising:
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a vibration transducer for sensing vibrations in a press section of a paper machine and producing an electrical signal representative of said vibrations; a feature extracting circuit for separating small amplitude repetitive impulse perturbations in a selected frequency range indicative of a selected fault in said press section from other low frequency components of said electrical signal; and an analyzer for analyzing said impulse perturbations to determine the nature of said fault in said press section. - View Dependent Claims (17)
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18. In a paper machine felt press section, a fault detection system, comprising:
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a sensor to sense signals representative of vibrations from said press; a feature extracting circuit having at least one band pass filter for receiving said signals and for separating and passing a predetermined range of harmonic frequencies from a small amplitude impulse perturbation in said signals indicative of a selected fault in said press, and an enveloping circuit to substantially square said signals passed by said band pass filter to enhance said small amplitude impulse perturbation; and an analyzer for receiving said signals from said enveloping circuit and indicating said selected fault in said press based upon said range of harmonic frequencies passed by said band pass filter indicative of said selected fault in said press.
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19. A method for detecting faults in paper machine press sections, comprising:
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sensing vibrations in a press section of a paper machine; producing a signal representative of said sensed vibrations; filtering said signal to separate a plurality of harmonics of small amplitude repetitive impulse perturbations therein in a selected frequency range indicative of a selected fault in said press section from other low frequency components in said signal; and analyzing said impulse perturbations to determine the nature of said fault in said press section based upon said plurality of harmonics of small amplitude repetitive impulse perturbations in said selected frequency range of said filtered signal indicative of said selected fault in said press.
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20. Apparatus for detecting faults in a paper machine press section, comprising:
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means for sensing vibrations in the press section of a paper machine; means for producing a signal representative of said sensed vibrations; means for filtering said signal to separate a plurality of harmonics of small amplitude repetitive impulse perturbations in a selected frequency range indicative of a selected fault in said press section from other low frequency components of said signal; and means for analyzing said impulse perturbations to determine the nature of said fault in said press section based upon said plurality of harmonics of small amplitude repetitive impulse perturbations in said selected frequency range indicative of said selected fault in said press section.
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21. Apparatus for detecting faults in a paper machine press section, comprising:
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a vibration transducer for sensing vibrations in a press section of a paper machine and producing an electrical signal representative of said vibrations; a feature extracting circuit for separating a plurality of harmonics of small amplitude repetitive impulse perturbations in a selected frequency range indicative of a selected fault in said press section from other low frequency components of said electrical signal; and an analyzer for analyzing said impulse perturbations to determine the nature of said fault in said paper machine press section based upon said plurality of harmonics of small amplitude repetitive impulse perturbations in said selected frequency range indicative of said selected fault in said press section.
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Specification