Acoustic detection of bearing defects
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United States of America Patent
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-
Jul 4, 1989
Issued Date -
N/A
app pub date -
Mar 16, 1988
filing date -
Oct 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for the detection of impact frequencies in moving railway train bearings which are characteristic of bearing defects. The apparatus transduces acoustic vibrations of the bearings into an electrical signal and extracts an envelope modulated carrier frequency component from the electric signal. The envelope is extracted from the carrier frequency component and is analyzed by a bandpass filter. The bandpass filter includes a switch capacitor filter controlled by a master clock which, in turn, is controlled by train speed and/or direction sensors positioned along the track on which the train travels.
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