Measuring and testing – Vibration – Sensing apparatus
Reexamination Certificate
2011-01-11
2011-01-11
Saint Surin, J M (Department: 2856)
Measuring and testing
Vibration
Sensing apparatus
C073S660000, C073S489000, C702S056000
Reexamination Certificate
active
07866213
ABSTRACT:
A method for identifying an unfolded non-synchronous blade vibration frequency in blades on a rotating rotor using a plurality of probes spaced from each other about the rotor. A set of data is acquired from the probes during a predetermined number of rotor revolutions and is processed using a Fourier analysis to generate an output representative of frequencies and phase shift angles corresponding to blade vibrations. The phase shift angles are used to identify a subharmonic for a blade vibration frequency to provide an output identifying the vibration frequency. A space dispersion and time dispersion of probes is described to increase the accuracy of the subharmonic determination using the phase shift angles.
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M Saint Surin J
Siemens Energy Inc.
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