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METHOD AND SYSTEM FOR ABNORMALITY DIAGNOSIS OF VERY LOW SPEED ROTATING MACHINE

  • US 20100116060A1
  • Filed: 03/17/2008
  • Published: 05/13/2010
  • Est. Priority Date: 03/26/2007
  • Status: Active Grant
First Claim
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1. A method for abnormality diagnosis of a roller bearing of a very low speed rotating machine comprising detecting an acoustic signal emitted from a roller bearing of a rotating machine accompanying very low speed rotation of 10 rpm or less being diagnosed so as to diagnose any abnormality in the same,said method for abnormality diagnosis of a roller bearing of a very low speed rotating machine characterized byusing a sensor having a sound pickup function to detect sound emitted from a bearing being detected as sound pressure, suitably amplifying it to obtain an acoustic signal, and finding a spectrum distribution of the same by frequency analysis,finding a spectral average value or effective value of a frequency more than or equal to the natural frequency of the bearing from a frequency analysis waveform obtained by said frequency analysis, andcomparing said spectral average value or effective value with a separately found reference value and judging the bearing to be abnormal when exceeding said reference value.

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