Vibration analysis system and vibration analysis method

A vibration analysis system comprising:

• a sensor configured to be attached to an operating object, the sensor being one of an acceleration sensor using a piezoelectric unit or a servo type acceleration sensor;
• a signal input portion that receives an input of a vibration signal detected by the sensor and that outputs a digital vibration signal corresponding to the object;
• an intensity calculation portion that receives the digital vibration signal corresponding to the object from the signal input portion and calculates a plurality of signal intensities corresponding to a plurality of frequency bands by analyzing the digital vibration signal corresponding to the object;
• a first distance calculation portion that calculates a first Mahalanobis distance of a first signal space configured of the plurality of signal intensities with respect to a previously-set first unit space;
• a gravity center calculation portion that calculates two-dimensional gravity center data indicating gravity center positions of the plurality of signal intensities calculated by the intensity calculation portion;
• a second distance calculation portion that calculates a second Mahalanobis distance of a second signal space configured of the two-dimensional gravity center data with respect to a previously-set second unit space;
• and
• an abnormality prediction portion that predicts an abnormality generation period at which an abnormality is generated in the object based on the first Mahalanobis distance and the second Mahalanobis distance,
• the system configured to cause maintenance preparation for the object to be advanced responsive to the first Mahalanobis distance exceeding a first threshold and to cause maintenance on the object to be initiated responsive to the second Mahalanobis distance exceeding a second threshold.