Abstract
The studies of the cracked rotor demonstrated by Japanese researchers started in early 1980s and many papers have been reported. The characteristics of these Japanese papers are: A group of papers investigated the vibration of the practical machinery and the estimation of the position and depth of the crack was tried in the quite early time, Another group of papers used a simple rotor model and investigated the vibration caused by the crack theoretically considering the nonlinearity involved in the crack's characteristic. In the following, these studies of the cracked rotor are divided in the groups, the studies on the vibration analysis of the cracked rotor using simple rotor model, the studies on the vibration analysis of the rotor system with the breathing crack, the studies on the modeling and detection method of the crack and case study of the cracked rotor, and reviewed in detail.
