Rubbing Determination Device For Rotary Machine, And Rubbing Determination Method

Abstract: This rubbing determination device is for determining rubbing in a rotary machine having a rotation part rotatably supported with respect to a stationary part by a bearing. The device acquires an AE signal from an AE sensor attached to the stationary part. A maximum value and a minimum value of an envelope obtained by performing envelope processing on the temporal change of the AE signal are identified by signal analysis of the AE signal, and a first frequency spectrum corresponding to a first time zone including the maximum value in the temporal change, a second frequency spectrum corresponding to a second time zone including the minimum value in the temporal change, and an average spectrum of the first frequency spectrum and the second frequency spectrum are calculated. A first signal intensity ratio is calculated as a ratio of the signal intensity in a frequency band higher than a reference frequency in the first frequency spectrum with respect to the ratio of the signal intensity in the entire frequency band of the average spectrum. A second signal intensity ratio is calculated as a ratio of the signal intensity in a frequency band higher than the reference frequency in the second frequency spectrum with respect to the ratio of the signal intensity in the entire frequency band of the average spectrum. A first index is calculated as a ratio of the first signal intensity ratio to the second signal intensity ratio. The presence or absence of rubbing is determined on the basis of the first index.

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