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概要

Failures of machines having rotating parts are mostly caused by damage to bearings and conventional diagnostic methods have found difficulties in performing the early detection of such damage, so that more advanced diagnosis is necessary. This study therefore applies an ultrasonic technique to bearing life tests. The experimental results of ultrasonic wave pulse (UWP) echoes have demonstrated that the time intervals between peaNs of UWP echoes varied in accordance with the movement of rolling balls. The autocorrelation coefficient has further been used to analyze the UWP echoes. The values of the autocorrelation coefficient were in good connection with the time intervals between peaNs of UWP echoes and were thought to provide the possibility of the early detection of abnormalities in ball bearings. Wavelet analysis was also employed to visualize the rolling behavior of balls in bearings.

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