Stabilization of Centrifuges with Instabilities Due to Fluid-Structure Interactions: Various Control ApproachesReport as inadecuate




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International Journal of Rotating Machinery - Volume 7 2001, Issue 5, Pages 323-333

Universität-GH Essen, Lehrstuhl für Mechanik, FB 12, Schfüzenbahn 70, Essen 45127, Germany

Received 30 May 2000; Revised 21 June 2000

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Partially filled centrifuges exhibit unstable behavior over particular rotational speedranges. To remove this unstable behavior, three different control approaches arepresented which are experimentally implemented using a magnetic bearing. First, bymeans of a PD-controller the system stiffness is changed leading to a shift of the instabilityregion. Second, the instability region is removed by a cross coupled feed backof the rotor vibration velocities. This cross coupling directly counteracts the fluid excitationmechanism. Third, a disturbance observer is presented which allows to estimateand compensate the not exactly known fluid force.





Author: Heinz Ulbrich, Adrian Cyllik, and Guido Ahaus

Source: https://www.hindawi.com/



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