Process and device for measuring operating turbine blade vibrati

Details Process and device for measuring operating turbine blade vibrati Process and device for measuring operating turbine blade vibrati

1993-09-02

1996-04-30

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

73660, G01H 900

Patent

active

055114261

ABSTRACT:
A process and a device for the optical measurement of vibrations of rotating turbine blades moving with a specified speed of rotation. In one embodiment, the process comprises the steps of generating three reference signals in response to the detection, by an optical detector, of the passing of a marking made on the hub of a turbine wheel; detecting measurement signals, by another optical detector, in response to the passing of another marking made on at least one of the parts of a turbine blade, the blade undergoing oscillation; determining the time offsets existing between each of the reference signals and each of the measurement signals, these offsets being, in the absence of oscillations of the blade, zero or equal to specified constant values; and calculating the amplitude, frequency and phase components of blade vibration from the various offsets recorded.

REFERENCES:
patent: 4080823 (1978-03-01), Stargardter
patent: 4109532 (1978-08-01), Donato
patent: 4573358 (1986-03-01), Luongo
"Measuring Vibration on Turbine Blades by Optical Means", H. Roth, Baden, Brown Boveri Review, vol. 64, No. 1, Jan. 1977, pp. 64-67.
"Une Mesure Optique Des Amplitudes de Vibration Tres Faibles", Mesures Regulation automatisme, vol. 43, No. 6/7, Jul. 1978, Paris, France, pp. 21-22.

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