Apparatus and method for diagnosing abnormal operation of a rotor

A method of diagnosing abnormal operation of a rotor having a shaft configured to be axially rotated, the method comprising:

• axially supporting the shaft at a specific axial position;
• generating a vibration signal indicative of rotor acceleration over time by detecting vibration occurring in the rotor at the specific axial position while the shaft axially rotates;
• generating a periodic pulse signal over time, the generated periodic pulse signal including a periodic pulse for each rotation of the shaft;
• determining the detected vibration to be an abnormal vibration when the vibration signal includes an aperiodic pulse signal, and
• displaying a status of the rotor at an angular position of the rotor based on a timing of the abnormal vibration with respect to the periodic pulse signal in order to indicate the angular position by turning on one light emitting device among a plurality of light emitting devices circumferentially arranged at regular intervals around the rotor.

An apparatus for diagnosing abnormal operation of a rotor having a shaft configured to be axially rotated, the apparatus comprising:

• a first sensor provided in a bearing mount supporting the shaft at a specific axial position along the shaft to detect vibration occurring in the rotor at the specific axial position of the bearing mount while the shaft axially rotates and to generate a vibration signal indicative of rotor acceleration over time;
• a second sensor installed at a location radially relative to the specific position of the first sensor to generate a periodic pulse signal over time, the generated periodic pulse signal including a periodic pulse for each rotation of the shaft;
• a display circumferentially arranged at regular intervals around the rotor in order to display a rotor status at any of a plurality of angular positions of the rotor with respect to the specific axial position of the shaft;
• and
• a controller configured to
• determine an operation state of the rotor based on the respectively generated signals, the operation state determined to be a normal state when the detected vibration periodically occurs while the shaft axially rotates and determined to be an abnormal state when the detected vibration is determined to be an instance of aperiodic vibration by detecting an aperiodic vibration signal between periodic vibration signals generated over time while the shaft axially rotates,
• determine a time of the aperiodic vibration with respect to the periodic pulse signal, and
• determine a position at which the aperiodic vibration occurs by converting the time of the aperiodic vibration into a radial angle of the rotor with respect to the shaft, the radial angle corresponding to one of the plurality of angular positions of the rotor.