Method for monitoring the operational state of rotor blades of a turbomachine

摘要

The present invention relates to a method for monitoring the operational state of rotor blades of a turbomachine, wherein higher harmonics of the Eigen-Frequencies are measured by vibration monitoring sensors mounted on a shaft of the rotor and then phases of those measured higher harmonics are determined, wherein those phases are used as measurement variables for detecting a frequency shift due to a mass loss.