Vibration detection through correlation of nodal measurements of a physical quantity

A sign detection device, comprising:

• a plurality of sensors disposed at a plurality of positions along a circumferential direction of a cross-section at a position where a vibration can be detected in a detection target object and configured to measure physical quantities at each position, wherein
• each of the plurality of sensors comprises at least one of a pressure sensor, a strain sensor, an acceleration sensor, a velocity sensor, and a displacement sensor, and
• the detection target object comprises at least one of a gas turbine, a steam turbine, an engine, a boiler, an aircraft, or a compressor;
• a data acquisition unit for acquiring time-series fluctuation data of the physical quantities from the plurality of sensors;
• a calculation unit for calculating, from the time-series fluctuation data, a parameter indicating a correlation between the physical quantities at any two positions among the plurality of positions;
• and
• a detection unit for detecting a sign of change in vibration of the detection object based on the parameter,
• wherein the parameter is a correlation coefficient indicating a correlation between fluctuations of the physical quantities at each position,
• wherein the calculation unit calculates the correlation coefficient for all combinations of two positions selected from the plurality of positions, and calculates link strength from a sum of an absolute value of the calculated correlation coefficients, and
• wherein the detection unit detects the sign of change in vibration based on the link strength.