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Analyzing vibration of rotating blades

  • US 6,584,849 B2
  • Filed: 03/28/2002
  • Issued: 07/01/2003
  • Est. Priority Date: 04/17/2001
  • Status: Expired due to Term
First Claim
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1. A method of characterising the vibration of a plurality of rotating blades mounted on a rotor, the method including the steps of:

  • providing a strain gauge on one of the blades;

    analysing data from the strain gauge to provide information about the frequencies of vibration and the vibrationally induced stresses in that blade;

    providing at least one stationary timing probe for detecting the times at which respective blades pass the probe;

    analysing data from the or each timing probe to obtain information about the amplitudes and/or velocities of vibration of each of the plurality of blades;

    determining the relationship between vibrationally induced stress as measured by the strain gauge and vibrational amplitude or velocity as measured by the timing probe(s) for the blade on which the strain gauge is mounted, for a particular frequency of vibration; and

    assuming that the above relationship is applicable to each of the plurality of blades, calculating the vibrationally induced stress for each blade from its amplitude or velocity of vibration as measured by the timing probe(s) and the said relationship.

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