Device and method for detecting abnormality of rotating body

A device for detecting an abnormality of a rotating body characterized in that the improvement comprises:

• means for measuring various physical quantities of the rotating body in rotation;
• means for extracting a signal which is synchronized with the rotation of rotating body by the data measured by the measuring means;
• means for determining a condition of the rotating body from the signal extracted by the extracting means;
• and
• abnormality warning means for giving warning of abnormality when the determining means determine that the condition of the rotating body is abnormal;
• wherein the extracting means comprise an adaptive digital filter which extracts a signal synchronized with the rotation and picks out a signal having no correlation with the rotation by means of a data measured by the measuring means and a signal synchronized with the rotation extracted by the extracting means, and adapts the adaptive digital filter by means of the signal picked out and having no correlation with the rotation.