| 摘要 |
PURPOSE:To improve the accuracy in diagnosing the abnormality of a rolling bearing by taking out a solid sound generated by the rolling bearing in a form of an acceleration signal, and diagnosing a damaged portion of the bearing on the component of frequency which is extracted by contrasting a computed frequency with a frequency spectrum. CONSTITUTION:A signal issued by an acceleration detector 2 adhered closely to a rolling bearing 30 is inputted into an envelope detecting circuit 6 after passing through a filter 4 to determine a waveform on the basis of an envelope signal, and then in a computing circuit 8 for root mean square value, a value Q is determined through an equation I wherein Vrms denotes the root mean square value, Vpeak a peak value, and (a) or (b) constants. Thus the abnormality of the bearing 30 is diagnosed on the value Q, and its abnormal portion is diagnosed on a frequency spectrum determined in a frequency analyzing circuit 14.
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