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Determining machine operating conditioning based on severity of vibration spectra deviation from an acceptable state

  • US 5,875,420 A
  • Filed: 06/13/1997
  • Issued: 02/23/1999
  • Est. Priority Date: 06/13/1997
  • Status: Expired due to Term
First Claim
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1. A method of evaluating the operational condition of a machine when the machine'"'"'s vibration spectrum deviates from an acceptable state, the acceptable state being defined by an alarm limit envelope, the method comprising the steps of:

  • determining the vibration spectrum of the machine, the vibration spectrum characterizing an operational condition of the machine;

    determining the alarm limit envelope which represents a maximum vibration level above which a peak in the machine'"'"'s vibration spectrum is considered abnormal;

    comparing the amplitude of individual peaks within the machine'"'"'s vibration spectrum to the alarm limit envelope; and

    determining a deviation severity value based upon said comparing, the deviation severity value characterizing the severity of deviation from an acceptable state when at least one individual peak within the machine'"'"'s vibration spectrum exceeds the alarm limit envelope, said determining comprising the following steps;

    determining the peak excess magnitude for each vibration peak within the machine'"'"'s vibration spectrum, the peak excess magnitude being the amount by which the amplitude of each deviating vibration peak within the machine'"'"'s vibration spectrum exceeds the alarm limit envelope level;

    determining the ratio of the peak excess magnitude to the alarm limit envelope level; and

    evaluating the deviation severity value for the machine'"'"'s vibration spectrum based upon both the peak excess magnitude and the ratio of the peak excess magnitude to the limit envelope level.

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