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Method and apparatus for identifying defects in a rotating machine system

  • US 6,116,089 A
  • Filed: 08/07/1997
  • Issued: 09/12/2000
  • Est. Priority Date: 08/07/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting defects in a rotating machine system, the system including a shaft supporting a machine element in rotation, the apparatus comprising:

  • a sensor coupled to the machine system for detecting vibration of the machine system and generating an output signal representative thereof;

    a memory circuit for storing a normal vibration profile of the machine system and at least one tolerance amplitude at an identified frequency of the profile; and

    a signal processing circuit coupled to the sensor and to the memory circuit, the signal processing circuit being configured to derive an actual vibration profile from the output signal, to compare the actual vibration profile to the normal vibration profile to identify a vibration level above the tolerance amplitude for the identified frequency, and to the generate a defect signal when the amplitude at the identified frequency is above the tolerance amplitude.

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