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Apparatus-and-method-for-removing-common-mode-vibration-data-from-digital-turbine-blade-vibration-data

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Apparatus and method for removing common mode vibration data from digital turbine blade vibration data

Details

Inventors: Twerdochlib, Michael; Rozelle, Paul F.; Sarasas, Santitavee;
Assignee: Westinghouse Electric Corp. (Pittsburgh, PA)
Primary Examiner: Arana; Louis
Assistant Examiner:
Attorney, Agent or Firm:

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.

DETAILED DESCRIPTION The present invention is directed to an apparatus and method for removing common mode vibration data from digital turbine blade vibration data in a fast, efficient manner which does not require the intervention of a skilled operator.
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 turbine blade at the sensor.
A second circuit establishes an expected arrival time for each turbine blade at the sensor.
A third cicuit is responsive to the digital data for generating a plurality of data entries, each data entry representing the difference between the actual arrival time and the expected arrival time of one of the turbine blades at the sensor.
A fourth circuit stores the data entries in a first string.
The first string has a plurality of dummy entries at the beginning thereof and at the end thereof for the purpose of simplifying the algorithm needed to calculate a running average.
The fourth circuit also inserts into the first string space saver characters in the event that the data entry for a 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 the vibration common to all of the turbine blades, i.
e.
representative of common mode vibration.
A sixth circuit subtracts each of the average values from its corresponding data entry in the first string to produce a second string wherein the entries in the second string are free of common mode vibration data.
The present invention is also directed to a method of removing common mode vibration data from digital turbine blade vibration data comprising the steps of producing a signal indicative of the actual arrival time of each turbine blade at a sensor.
Digital data representing the actual arrival time of each turbine blade at the sensor is produced from that signal

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