Patent ID: 9689660
Date: 2017-06-27
CPC Classifications: F01D,G01B,G04C,G05B,H02K

Claim:
1. A device for monitoring status of turbine blades, the device comprising: one or more first sensors mounted so as to be removable from an outer surface of a casing opposed to blade tips; a second sensor for acquiring a signal from a fixed point on a rotor shaft of the blades; a section configured to extract data groups from an output signal of the first sensor on the basis of information acquired by the second sensor; a section configured to average the data groups; a section configured to determine thresholds from averaged data obtained under a healthy condition; and an assessing section configured to compare magnitude of the thresholds and sensor signals obtained during blade status monitoring, wherein the section configured to determine the thresholds from the averaged data obtained under the healthy condition analyzes a frequency component of an averaged time-series signal and extracts, as thresholds, signal intensities of frequencies: a frequency “f wherein the assessing section configured to compare the magnitude of the thresholds and the sensor signals obtained during blade status monitoring compares magnitude of signal intensities of the frequencies.