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Abnormality diagnosing system for mechanical equipment

  • US 7,640,139 B2
  • Filed: 10/17/2005
  • Issued: 12/29/2009
  • Est. Priority Date: 10/18/2004
  • Status: Active Grant
First Claim
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1. An abnormality diagnosing system for a mechanical equipment, which detects sounds or vibrations generated by a mechanical equipment, analyzes thus detected signal and diagnoses an abnormality for a bearing or a bearing related member in the mechanical equipment, comprising:

  • an envelope processor that obtains an envelope for the detected signal;

    a Fast Fourier Transform (FFT) unit that transforms the envelope obtained by the envelope processor into a frequency spectrum;

    a peak detector that smoothes the frequency spectrum obtained by the FFT unit by performing a moving average calculation process and detects peaks in the frequency spectrum; and

    a diagnosis processor that diagnoses an abnormality based on the peaks in the frequency spectrum detected by the peak detector,wherein the peak detector comprises;

    a moving average processor which weights the frequency spectrum obtained by the FFT unit with a weighting coefficient and calculates a weighted moving average.

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