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Combined amplitude and frequency measurements for non-contacting turbomachinery blade vibration

  • US 8,606,541 B2
  • Filed: 06/07/2010
  • Issued: 12/10/2013
  • Est. Priority Date: 06/12/2009
  • Status: Active Grant
First Claim
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1. A method of measuring the vibration of a blade comprising:

  • a) associating at least one first sensor with a blade, the at least one first sensor having a narrow field of measurement;

    b) determining blade tip time of arrival data from the at least one first sensor to determine a total blade tip deflection;

    c) associating at least one second sensor with the blade, the at least one second sensor having a wide field of view;

    d) determining amplitude, frequency and phase data of the blade from the at least one second sensor;

    e) determining, by the processor, the vibration of the blade using the blade tip time of arrival data and the amplitude, frequency and phase data; and

    f) decomposing, by the processor, the total blade tip deflection into a deflection contribution due to each of the individual active mode of vibration of the blade.

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