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This paper presents a methodology and some results on the dynamic stability of an elasticrotating system consisting of one- and twodimensional members. These parts may containdifferent kinds of unsymmetries: either from mass- or stiffness imperfections or from anisotropicespecially hydrodynamic bearings. The equations of motion are formulated usingvirtual work and an Finite Element approach. Special attention is paid to a kinematicallyconsistent coupling of the elastic shell and disc. The eigenvalue extraction is based upon themethod of Lanczos including a modal reduction and a correction process in order to ensuretrue diagonal system matrices. Some typical results for a shaft-disc-shell system with differentbearings and imperfections are presented in detail

Dynamic Stability of an Elastic Rotating System: Shell-Disc-Shaft