Abstract
An experimental investigation of the self-excited whirling of a rigid rotor partially or fully filled with liquid on an elastic support has been performed. Vibrations of amplitudes of the support springs are measured and analyzed by FIT under various conditions, such as rotating speed, fluid fill ratio, of fluid viscosity. The experimental results are compared with the theoretical predictions of previous authors. As a result, it was found that an unstable state may appear even for a completely full-filled rotor, and that there must be a different phenomenon from that for a partially-filled rotor. Conical mode is also observed in addition to parallel mode, which has a very wide unstable range of rotating speed.
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