System and methodology for vibration analysis and condition monitoring
First Claim
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1. A method for monitoring machine faults comprising:
- (a) determining one or more base vibration features associated with said machine;
(b) acquiring time-based vibration data samples from a vibration transducer in physical contact with said machine;
(c) determining a machine operating speed estimate for said machine using a continuous vibration model;
(d) acquiring vibration data for said machine occurring at said machine operating speed; and
(e) determining whether one or more faults exists within said machine based upon a comparison of said base vibration features with said vibration data occurring at said machine operating speed,wherein said determining the machine operating speed estimate further comprises;
(a) selecting a discrete range of operating speeds through which to conduct a search;
(b) dividing the time-based vibration data sample into a plurality of sub-records of sample lengths;
(c) obtaining the coefficients of a digital comb filter based upon P;
(d) convoluting the time-based vibration data samples using the digital comb filter in the time-domain;
(e) computing the total vibration power and the coherent vibration power,(f) computing a vibration power error function;
(g) selecting the optimal P that minimizes the error function by comparing the error functions of all sub-record lengths within said selected discrete range of operating speeds; and
(h) estimating and outputting the machine speed RPM based upon said selected optimal P.
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Abstract
A system and methodology for continuous condition monitoring of rotating equipment. Employ adaptive signal processing techniques to determine the RPM of a rotating machine from time-based vibration data. RPM is determined based upon the input of a digitized time-based sample sequence of vibration data acquired directly from a vibration transducer for on-line real-time measurement of the machine RPM. Once RPM is determined, online vibration analysis for a given RPM or set of RPMs may be performed. The present invention extracts characteristic vibration features from vibration data and uses these extracted values to provide condition detection and diagnoses of machine faults.
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Citations
18 Claims
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1. A method for monitoring machine faults comprising:
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(a) determining one or more base vibration features associated with said machine; (b) acquiring time-based vibration data samples from a vibration transducer in physical contact with said machine; (c) determining a machine operating speed estimate for said machine using a continuous vibration model; (d) acquiring vibration data for said machine occurring at said machine operating speed; and (e) determining whether one or more faults exists within said machine based upon a comparison of said base vibration features with said vibration data occurring at said machine operating speed, wherein said determining the machine operating speed estimate further comprises; (a) selecting a discrete range of operating speeds through which to conduct a search; (b) dividing the time-based vibration data sample into a plurality of sub-records of sample lengths; (c) obtaining the coefficients of a digital comb filter based upon P; (d) convoluting the time-based vibration data samples using the digital comb filter in the time-domain; (e) computing the total vibration power and the coherent vibration power, (f) computing a vibration power error function; (g) selecting the optimal P that minimizes the error function by comparing the error functions of all sub-record lengths within said selected discrete range of operating speeds; and (h) estimating and outputting the machine speed RPM based upon said selected optimal P. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for detecting faults within a machine comprising:
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means for determining one or more base vibration features associated with said machine; means for acquiring time-based vibration data samples from a vibration transducer in physical contact with said machine; means for determining a machine operating speed estimate for said machine using a continuous vibration model; means for acquiring vibration data for said machine occurring at said machine operating speed; and means for determining whether one or more faults exists within said machine based upon a comparison of said base vibration features with said vibration data occurring at said machine operating speed, wherein said means for determining a machine operating speed comprises; (a) means for selecting a discrete range of operating speeds through which to conduct a search; (b) means for dividing said time-based vibration data sample into a plurality of sub-records of sample length P; (c) means for obtaining the coefficients of a digital comb filter based upon P; (d) means for convoluting the time-based vibration data samples using the digital comb filter in the time-domain; (e) means for computing the total vibration power and the coherent vibration power; (f) means for computing a vibration power error function; (g) means for selecting the optimal P that minimizes the error function by comparing the error functions of all sub-record lengths within said selected discrete range of operating speeds; and (h) means for estimating the machine speed RPM based upon said selected optimal P. - View Dependent Claims (15, 16, 17, 18)
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Specification