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System and methodology for vibration analysis and condition monitoring

  • US 7,133,801 B2
  • Filed: 01/12/2005
  • Issued: 11/07/2006
  • Est. Priority Date: 06/07/2002
  • Status: Expired due to Fees
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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