Apparatus and method for removing common mode vibration data fro

Details Apparatus and method for removing common mode vibration data fro Apparatus and method for removing common mode vibration data fro

1990-11-01

1992-09-22

Arana, Louis

Measuring and testing

Vibration

Sensing apparatus

32420711, G01H 1100, G01B 714

Patent

active

051487110

ABSTRACT:
A sensor produces a signal indicative of the actual arrival time of each turbine blade at the sensor. A first circuit is responsive to the sensor for producing digital data representing the actual arrival time of each blade at the sensor. A second circuit establishes expected arrival times for each blade at the sensor. A third circuit is responsive to the digital data for generating a plurality of data entries each representing the difference between the actual arrival time and the expected arrival time. A fourth circuit stores the data entries in a first string having a plurality of dummy entries at the beginning thereof and at the end thereof and inserts into the string space saver characters in the event that the data entry for a particular blade is not produced. A fifth circuit establishes a running average value, over a plurality of data entries, for each data entry. The running average value is representative of common mode vibration. The average value is subtracted from its corresponding data entry to produce a second string wherein the entries in the second string are free of common mode vibration data.

REFERENCES:
patent: 4049644 (1977-09-01), Wennerstrom
patent: 4573358 (1986-03-01), Luongo
patent: 4593566 (1966-06-01), Ellis
patent: 4790189 (1988-12-01), Twerdochlib
patent: 4887468 (1989-12-01), McKendree et al.
patent: 4996880 (1991-03-01), Leon et al.
patent: 5015949 (1991-05-01), Koch et al.

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