Heinz Ulbrich, Adrian Cyllik, Guido Ahaus, "Stabilization of Centrifuges with Instabilities Due to Fluid-Structure Interactions: Various Control Approaches", International Journal of Rotating Machinery, vol. 7, Article ID 270835, 11 pages, 2001. https://doi.org/10.1155/S1023621X01000276
Stabilization of Centrifuges with Instabilities Due to Fluid-Structure Interactions: Various Control Approaches
Partially filled centrifuges exhibit unstable behavior over particular rotational speed ranges. To remove this unstable behavior, three different control approaches are presented which are experimentally implemented using a magnetic bearing. First, by means of a PD-controller the system stiffness is changed leading to a shift of the instability region. Second, the instability region is removed by a cross coupled feed back of the rotor vibration velocities. This cross coupling directly counteracts the fluid excitation mechanism. Third, a disturbance observer is presented which allows to estimate and compensate the not exactly known fluid force.
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