Method and apparatus for detecting rubbing in a rotary machine

G - Physics – 01 – N

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349/29

G01N 29/04 (2006.01) G01H 1/00 (2006.01) G01N 29/12 (2006.01) G01R 31/34 (2006.01)

Patent

CA 1195418

Abstract: A method and apparatus for detecting the occurrence of rubbing in a rotary machine, in which at least one acoustic sensor is mounted on at least the rotor part or the stator part of the rotary machine, and the output signal from the acoustic sensor is detected and then filtered to extract a frequency component having a frequency substantially equal to the rotational frequency of the rotary machine, so as to detect the occurrence of rubbing in the rotary machine as early as possible and also to locate the source of the rubbing. Even when the occurrence of abnormal metal-to-metal contact at a bearing of the rotary machine is detected, it is discriminated from rubbing so that the occurrence of the rubbing can be reliably detected.

410836

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