presented a continuous model for vibration
analysis and detection of a crack in a non-rotating rotor. They
investigated effects of the size and location of the crack on the
changes in the eigenfrequencies and mode shapes of the cracked
rotor. They proposed a crack identification algorithm, based on the
deflections of the first mode shape at two symmetric points and the
contour diagram of crack location versus crack depth for the first
two normalized eigenfrequencies,