This paper investigates the stability and the stability degree of a cracked flexible rotor supported on different kinds of journal bearings. It is found that no matter what kinds of bearings are used, the unstable zones caused by rotor crack locate always within the speed ratio of 2/N1−ΔKξ /4<Ω<2/N when gravity parameter Wg>1.0; and locate always within the speed ratio of 2Ωα/N1−ΔKξ /4<Ω<2Ωα/N when Wg<0.1, where ΔKξ is the crack stiffness ratio, N=1,2,3,4,5,… and Ωα=1+1/2α1/2. When 0.1
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Meng et al. (1999) studied this question.
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