Demonstrates a new machine diagnosis technique using simplified autocorrelation calculations, indicating improved sensitivity.
Among many amplitude parameters, Kurtosis and Bicoherence are recognized to be the sensitive good parameters for machine diagnosis. In this paper, simplified calculation method of coefficient of autocorrelation function of 1^<st> order lag is introduced, and new deterioration factor of correlation of four variables is introduced consecutively. New deterioration factor is an absolute index of deterioration factor. Compared with the results obtained so far, the new method shows fairly good results. Varying N, the number of data, its characteristics are examined. When N is smaller, sensitivity is better. Therefore this parameter can be used as an index for the machine diagnosis of early failure stage especially.
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TAKEYASU et al. (2006) studied this question.
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