This paper deals with the stability of a spinning shaft in a concentric cylinder filled with
an incompressible fluid. The steady-state momentum and continuity equations for the external
fluid are established. Using Taylor expansion, the fluid forces exerted on the shaft
are calculated. The shaft is in the Rayleigh model taking into account the rotary inertia
and gyroscopic effects. Accordingly, the governing equation of the considered system is formulated
analytically. The explicit characteristic frequency equation for the pinned-pinned
spinning shaft system is then derived. Finally, the stability of the system is studied by means
of characteristic value analysis.
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