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

• Main Authors: P. Ruge, P. Senker
• Format: Article
• Language: English
• Published: Hindawi Limited 1997-01-01
• Series: International Journal of Rotating Machinery
• Subjects: Dynamic Stability; Elastic Rotorsystems; Lanczos Eigenvalue Solver; Imperfections.
• Online Access: http://dx.doi.org/10.1155/S1023621X97000043

This paper presents a methodology and some results on the dynamic stability of an elastic rotating system consisting of one- and twodimensional members. These parts may contain different kinds of unsymmetries: either from mass- or stiffness imperfections or from anisotropic especially hydrodynamic bearings. The equations of motion are formulated using virtual work and an Finite Element approach. Special attention is paid to a kinematically consistent coupling of the elastic shell and disc. The eigenvalue extraction is based upon the method of Lanczos including a modal reduction and a correction process in order to ensure true diagonal system matrices. Some typical results for a shaft-disc-shell system with different bearings and imperfections are presented in detail.