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Performance Assessment of a Multi-Frequency Controller Applied to a Flexible Rotor Magnetic Bearing System - Contact Dynamics


Reference:

Abulrub, A. H. G., Sahinkaya, M. N., Burrows, C. R. and Keogh, P. S., 2008. Performance Assessment of a Multi-Frequency Controller Applied to a Flexible Rotor Magnetic Bearing System - Contact Dynamics. In: Ulbrich, H. and Ginzinger, L., eds. 9th International Conference on Motion and Vibration Control, 2008-09-15 - 2008-09-18, Munich.

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Official URL:

http://dx.doi.org/10.1007/978-1-4020-9438-5_2

Abstract

Vibrations associated with external disturbances and rotor faults, such as cracks, usually exhibit themselves as harmonic components of the synchronous frequency. The essence of the multi-frequency form of the synchronous recursive open loop adaptive controller (ROLAC) is that it can minimise a number of vibration components simultaneously, for example, synchronous rotor vibration at frequency Ω, its harmonics and sub-harmonics within any defined range. This requires on-line identification of the speed dependent partial receptance matrix by using a multifrequency test signal incorporating all of the pertinent harmonic components. The question arises: What is the degradation in performance if the rotor comes into contact with its retainer bearing? This may arise when a magnetically levitated rotor is installed on a movable base frame, for example on board a ship or an aircraft. A simulation study is described to examine this question. It comprises a flexible rotor supported by two active magnetic bearings. Eight displacement transducers are positioned along the rotor. A local PID controller is provided for each axis of the magnetic bearings to ensure stability and alignment of the rotor at a central position. An outer ROLAC loop is incorporated at each bearing to control the vibrations at discrete frequencies of 0.5Ω, Ω, 2Ω and 3Ω. In addition, a multi-frequency disturbance was applied to the rotor causing contact with its retainer bearing. The performance of the multi-frequency ROLAC is assessed in preventing contact, or recovering the rotor position if contact occurs.

Details

Item Type Conference or Workshop Items (Paper)
CreatorsAbulrub, A. H. G., Sahinkaya, M. N., Burrows, C. R. and Keogh, P. S.
EditorsUlbrich, H.and Ginzinger, L.
DOI10.1007/978-1-4020-9438-5_2
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresInnovative Design & Manufacturing Research Centre (IdMRC)
RefereedYes
StatusPublished
ID Code13842
Additional InformationFrom: 9th International Conference on Motion and Vibration Control. Tech Univ Munchen, Munich, Germany, 15-18 September 2008

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