Dynamic Instability of a Rotating Asymmetric Shaft With Internal Viscous Damping Supported in Anisotropic Bearings

Vibration and Instability of Rotating Composite Thin-Walled Shafts with Internal Damping

“…On the other hand, composite material shafts have higher internal damping than conventional metallic shafts. However, as it has been shown in previous research [10] that internal damping in rotating assemblies may lead to whirl instabilities in high speed rotors. Therefore, accurate prediction of effects of internal damping in composite material rotors is essential.…”

Evolution of whirl in flexible isotropic rotors : modelling and experimental study

“…The effects of bearing and shaft asymmetries on the stability of rotor has been reported by Ganesan [9]. Wettergren and Olsson [10] considered a horizontal rotor with a flexible shaft supported in flexible bearings and found that major instabilities appear near the imbalance resonance and remarked that the resonances due to gravity near one half of the major critical could be reduced with enhanced material damping. Rajalingham et al [15] considered the influence of external damping on the stability and dynamic response of single disk horizontal rotors with anisotropic bending stiffness characteristics Campos et.al [19] reported a study on the dynamics of a Jeffcott rotor through Bond Graph formulation which provides for modelling of various nonlinear and multi-energetic systems.…”

“…The frequency equations and critical speeds of a straight circular rotor were obtained by Eshleman and Eubanks [5] who included the transverse shear, rotatory inertia and gyroscopic moments together with continuous shaft effects (distributed mass and elasticity) in their model. Research on rotor dynamics over the past three decades has been on improved models with the expedient of finite element formulation in some cases [6,[8][9][10][11][12]. Ozguven and Ozkan [8] , while considering the combined effect of shear deformation and internal damping, showed that requisite damping can suppress instability in homogeneous rotor-bearing systems.…”

Dynamic analysis of a rotating composite shaft

“…For a rotor made with composite materials, internal damping is much more significant than when associated with a metal rotor. Unfortunately, such damping may cause instability as shown by Wettergren [24].…”