Vibration analysis apparatus and vibration analysis method

A vibration analysis method comprising:

• storing, in a memory, first correspondence information indicating a correspondence between a change in a first rotation speed of a rotation mechanism and a change in a first vibration frequency corresponding to a first acceleration peak of acceleration of vibration in the rotation mechanism, for each first acceleration peak in a plurality of acceleration peaks used for calculation of a regression equation;
• analyzing, using circuitry, by extracting a second vibration frequency corresponding to a second acceleration peak of acceleration of vibration for each second acceleration peak in a plurality of acceleration peaks used for detecting an operational anomaly of the rotation mechanism, on a basis of vibration data indicating vibration of the rotation mechanism when vibration of the rotation mechanism is analyzed, and calculating, for each second acceleration peak, a waveform area that is an area of a waveform of the second acceleration peak by integrating the second acceleration peak over a specific frequency section;
• and
• determining, using the circuitry, whether an operational anomaly occurs in the rotation mechanism for each second acceleration peak on a basis of the waveform area and a threshold for a corresponding second acceleration peak, wherein
• the analyzing further includes identifying the first correspondence information stored in the memory that corresponds to the second acceleration peak based on the regression equation, tracking, in accordance with the first correspondence information identified, a change in the second vibration frequency due to a change in a second rotation speed when vibration of the rotation mechanism is analyzed, and calculating, for each second acceleration peak, the waveform area of the second acceleration peak corresponding to the second vibration frequency tracked.