Title: Abnormality diagnosis system for machinery
Application Number: 200580006288 Application Date: 2005.10.17
Publication Number: 1926413 Publication Date: 2007.03.07
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01H17/00;G01M13/04
Applicant(s) Name: NSK Ltd. Address:
Inventor(s) Name:
Attorney & Agent: shaoya li lixiao shu
Abstract:
    An abnormality diagnosis system for machinery comprises an envelope processing section (103) for determining the envelope of a detection signal, an FFT section (104) for converting the envelope into a frequency spectrum, a peak detecting unit (105) in which the frequency spectrum is smoothed by the moving average method, the resultant spectrum is subjected to a smoothed differentiation, frequency points at which the sign of differential coefficient changes from positive to negative are detected as peaks, peaks higher a predetermined threshold are extracted and sorted, and the higher ones are detected as peaks, and a diagnosis section (T) for performing abnormality diagnosis on the basis of the detected peaks.
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