No abstract

No abstract

No abstract

This paper investigatesthe stability and the stability degree of a flexible cracked rotor supported on different kinds of journal bearings. It is found that no matter what kind of bearings is used, the unstable zones caused by rotor crack locate always within the speed ratio 1 -< fl < _ when gravity parameter Ate 2nWz> !.0; and locate always within the speed ratioAge is the crack stiffness ratio, N= i, 2, 3, 41 5 .-. and fl == ( 1 + 2a_ 1/2 lion, where no unstable zones caused by rotor crack exist. ' t _/ • When 0.1 < W z < 1.0, there is a reOutside the crack ridge zones, the rotor crack has almost no influence on system/s stability and stability degree; while within the crack ridge zones, the stability and stability degree depend both on the crack and sys.temrs parameters. In s6me cases, the system may still be stable even the crack is very large. For small gravity parameter (We< 0.1), the mass ratio = has large influence on the position of unstable reg/on, but its influence on the stability degree is small. The influence of fixed Sommeffeld number S O on the crack stability degree is small although $o has large influence on the stability degree of untracked rotor.

No abstract