Modal analysis of continuous asymmetrical rotor-bearing systems

Abstract Modal analysis of an asymmetrical rotor-bearing system which consists of asymmetrical Rayleigh shafts, asymmetrical rigid disks and isotropic bearings is performed. The rotor includes the effects of rotary inertia and gyroscopic moment. A solution method for the vibration analysis of a rotating uniform asymmetrical shaft is developed. The whirl speeds and mode shapes of the uniform asymmetrical shaft are investigated, and the effects of the boundary conditions and rotor asymmetry on the modal properties and stabilities are examined. The resonances of asymmetrical rotor-bearing systems in forward and backward precessions are also discussed.