| 摘要 |
A method is provided for analysing blade displacements detected by a plurality of circumferentially spaced stationary timing probes associated with an assembly of rotating blades mounted on a rotor. The blade displacements correspond to the times at which the blades pass the respective probes. The method includes the step of: (a) identifying resonant vibration events in the assembly of rotating blades by performing the substeps of: (a-i) for each blade displacement detected by a timing probe, determining an associated running average blade displacement from a predetermined number of blade displacements detected by that probe for the same blade at adjacent rotations of the assembly, and subtracting the associated running average blade displacement from the blade displacement to calculate a corresponding zeroed blade displacement; (a-ii) determining, for successive rotations of the assembly, one or more correlation factors for respectively one or more of the blades, each correlation factor quantifying the degree of correlation between the zeroed blade displacements for a particular blade on a particular rotation and modelled blade displacements corresponding to possible blade vibrational deflections on that rotation; and (a-iii) identifying a resonant vibration event on a rotation when one or more of the correlation factors cross a predetermined threshold.
|
