Measuring and testing – Vibration – Sensing apparatus
Patent
1994-04-28
1995-12-05
Raevis, Robert
Measuring and testing
Vibration
Sensing apparatus
364508, G01N 2912
Patent
active
054718805
ABSTRACT:
An improved method and apparatus for detecting and identifying one or more resonantly vibrating blades of a turbine through the use of acoustic sensors imbedded in the stationary casing of the turbine is disclosed. The acoustic sensor signals are processed to separate the characteristic Doppler waveform from the accompanying random noise and periodic noise. Improved signal processing techniques which involve the evaluation of both an information-bearing resonant signal and its Hilbert transform via direct synthesis are disclosed.
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Lang George F.
Leon Robert L.
Electric Power Research Institute
Finley Rose M.
Raevis Robert
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