Method and apparatus for predicting destruction of a rolling bea

Details Method and apparatus for predicting destruction of a rolling bea Method and apparatus for predicting destruction of a rolling bea

1990-05-29

1991-03-26

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73593, 340682, G01M 1304

Patent

active

050019317

ABSTRACT:
Method for predicting destruction of a rolling bearing using an apparatus which has a sensor for detecting acoustic emission signals from a rolling bearing, a plurality of band-pass filters which have different specific frequency pass bands within the range of 150-400 KHz, first comparators for comparing outputs from the band-pass filters with their respective reference values for the specific frequency bands, time-measuring devices for measuring time during which the outputs from the band-pass filters exceed the reference values, and second comparators for comparing the time measured with a further reference value. Of all signals detected by the sensor, only those that have frequencies of 150-400 KHz pass the corresponding band-pass filters, and then are compared with their respective reference values. The first comparators signal to the time-measuring devices when the outputs from the band-pass filters exceed the reference values. Time during which each of the first comparators continues to signal is measured by the time-measuring devices and the time measured is compared with the further reference value by the second comparators. Based on comparison results by the second comparators, destruction of the rolling bearing is judged.

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