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Machine performance monitoring and fault classification using an exponentially weighted moving average scheme

  • US 5,602,761 A
  • Filed: 12/30/1993
  • Issued: 02/11/1997
  • Est. Priority Date: 12/30/1993
  • Status: Expired due to Term
First Claim
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1. A computer-based method for monitoring and diagnosing an abnormal machine condition, comprising the steps of:

  • (1) operating a machine under normal machine conditions;

    (2) defining a parametric model for said machine operating under said normal machine condition;

    (3) calculating an Exponentially Weighted Moving Average (EWMA) statistic based on prediction errors generated in fitting abnormal vibration signals to said parametric model; and

    (4) comparing said EWMA statistic to a limit, wherein if said EWMA statistic is above said limit said machine is operating abnormally.

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