MEASURED-SIGNAL PROCESSING METHOD FOR INSTRUMENT FOR MEASURING VIBRATION OF BLADE OF ROTATING MACHINE IN NONCONTACT WAY

摘要

PROBLEM TO BE SOLVED: To provide a measured-signal processing method in which a measured vibration component can be recognized precisely without being disturbed by a noise component by a method wherein, when one or more harmonic component values at a specific rate or higher with reference to the maximum value of a vibration component at the integral multiple of a speed of rotation exist, their measured values are excluded from vibration measured data. ;SOLUTION: The vibration-waveform measured signal in the half circumference of a blade of a rotating machine is moved in parallel, a vibration waveform signal in the whole circumference is created, and the signal is frequency-analyzed (Steps 31, 33). Then, the maximum value of a vibration frequency component is compared with other harmonic component values (Step 35). When one or more component values at 30 to 70% or higher with reference to the maximum value exist, their measured data are excluded (Step 37) so as not to be used for a vibration analysis. Then, the Campbell diagram is created on the basis of other vibration measured signals (Step 39). The above signal processing operation is repeated for every speed of rotation of a vibration measurement.;COPYRIGHT: (C)1999,JPO