Apparatus for detecting a failure in bearings

Details Apparatus for detecting a failure in bearings Apparatus for detecting a failure in bearings

1988-06-03

1989-12-05

Levy, Stewart J.

Measuring and testing

Vibration

Sensing apparatus

73587, G01N 2904

Patent

active

048844497

ABSTRACT:
An apparatus for detecting a failure in a bearing has an acoustic emission sensor which detects acoustic emission from the bearing and outputs signals indicative of power of the acoustic emission, a bandpass filter which passes only signals in the range of from 100 kHz to 500 kHz out of the signals received from the aforementioned sensor, and a comparator which compares each of the signals in the range of from 100 kHz to 500 kHz extracted by the bandpass filter with a predetermined threshold value and outputs event signals each of which expresses that the signal from the bandpass filter exceeds the threshold value. This apparatus also has a computer which receives the event signals from the comparator, determines time intervals in which the event signals occur, totals the number of event signals for respective timer intervals, and determines whether or not the number of totaled events exceeds a predetermined threshold value to determine a failure in the bearing.

REFERENCES:
patent: 3924456 (1975-12-01), Vahaviolos
patent: 4024522 (1977-05-01), Clark et al.
patent: 4481819 (1984-11-01), Yoneyama et al.
patent: 4574633 (1986-03-01), Ohnuki et al.
patent: 4609994 (1986-09-01), Bassim et al.
patent: 4738137 (1988-04-01), Sugg et al.

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