Electromagnetic Damper Stabilization for Contained-Liquid-Induced Rotor Vibration

概要

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It is well known that unstable vibrations occur at a certain range of rotation speeds when the rotors are partially filled with liquid. Similar self-excited vibrations appear in large-scale and continuous flow-type ultra-centrifuges due to the formation of layers distributed from the inside to the outside in the rotor depending on increasing weight density. The unstable vibrations feature a forward-whirl rotor motion. An electromagnetic bearing control, reacting to the detected rotor displacement, can produce an artificial damping effect for this stabilization. The control to produce the damping effect is realized by a cross network combined with a tuning filter, i. e., the cross stiffness function commonly denoted by +Kxy and -Kyx. The sign of the cross stiffness depends upon the whirl direction. This control strategy using the cross effect successfully combatted unstable flow-induced forward rotor vibrations.
一般社団法人日本機械学会の論文
1988-12-15