Method of detecting rubbing between rotating body and stationary body

Vibrations at a plurality of points on a turbine rotor and vibrations at corresponding points of the turbine stator are measured during a common sampling period for each corresponding points. Consequently, vibration data are obtained for each point on the turbine rotor and for each point on the turb...

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Bibliographische Detailangaben
Hauptverfasser:	OTAWARA, YASUHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING PHYSICS TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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Beschreibung
Zusammenfassung:	Vibrations at a plurality of points on a turbine rotor and vibrations at corresponding points of the turbine stator are measured during a common sampling period for each corresponding points. Consequently, vibration data are obtained for each point on the turbine rotor and for each point on the turbine stator corresponding to the point on the turbine rotor. Then, a correlation coefficient representing the correlation between the vibration data of each point on the turbine rotor and the vibration data of corresponding point on the turbine stator is calculated, and the correlation coefficient is differentiated. The correlation coefficients and the differential values are then compared with respective predetermined reference values. The occurrence of rubbing is detected from the result of these comparisons.