Acoustic detection of bearing defects

Details Acoustic detection of bearing defects Acoustic detection of bearing defects

1988-03-16

1989-07-04

Levy, Stewart J.

Measuring and testing

Vibration

Sensing apparatus

246169S, G01N 2904

Patent

active

048438855

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.

REFERENCES:
patent: 3016457 (1962-01-01), Brown et al.
patent: 3558876 (1971-01-01), Tillman
patent: 4129276 (1978-12-01), Svet
patent: 4696446 (1987-09-01), Mochizuki et al.

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