液体を内蔵したロータの不安定振動に対する電磁ダンパによる安定化

概要

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It is a well-known phenomenon that unstable rotor vibration occurs when rotors, partially filled with liquid, are rotated through a certain range of rotational speeds. This type of self-excited vibration appears in large-scale continuous flow ultracentrifuges, due to heavier liquid forming laminations with greater weight density. The unstable vibration results from a forward whirl rotor motion. An electromagnetic bearing control, reacting to detection of the rotor displacement, can produce particular damping force characteristics as are required for stabilization. Our control technique features an additional cross coupling network between x and y directional channels. This is equivalent to the damping effect generated by the cross stiffness of the bearing reaction : Kxy and Kyx. The sign of the cross stiffness especially depends upon the whirl direction. This optional control strategy using the cross effect is successfuly experienced by combating unstable flow induced forward rotor vibration.
一般社団法人日本機械学会の論文
1987-12-25