BLADE SHROUD VIBRATION MONITOR

摘要

A method for predicting a blade structure failure within a coupled blade structure including a plurality of blades (12) supported for rotation on a rotor (13) and a shroud structure (40) coupling the blades (12). The method includes the steps of determining displacements of a plµrality of predetermined circumferential locations (50) on the shroud structure (40) during rotation of the blade row, where the displacements are provided as a function of time relative to the periodic rotation of the shroud structure (40) for time intervals that are integer multiples of rotor rotation. A signal characteristic related to vibrational mode and a nodal diameter of the shroud structure (40) is derived based on the displacements of the circumferential (50) locations on the shroud structure (40).