Sahinkaya, M. Necip, Abulrub, Abdul-Hadi G., Burrows, Clifford R. and Keogh, Patrick S.. (2010) A multiobjective adaptive controller for magnetic bearing systems. Journal of Engineering for Gas Turbines and Power, Vol.132 (No.12). article no. 122503 . ISSN 0742-4795

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Abstract

The paper considers three issues in flexible rotor and magnetic bearing systems, namely the control of rotor vibration, control of transmitted forces, and prevention of rotor contact with auxiliary bearings. An adaptive multiobjective optimization method is developed to tackle these issues simultaneously using a modified recursive adaptive controller The proposed method involves automatic tuning of the weighting parameters in accordance with performance specifications. A two-stage weighting strategy is implemented, involving base weightings, calculated from a singular value decomposition of the system's receptance matrices, and two adjustable weighting parameters to shift the balance between the three objective functions. The receptance matrices are functions of rotational speed and they are estimated in situ. The whole process does not require prior knowledge of the system parameters. Real-time implementation of the proposed controller is explained and tested by using an experimental flexible rotor magnetic bearing system. The rotor displacements were measured relative to the base frame using four pairs of eddy current displacement transducers. System stability is ensured through local PID controllers. The proposed adaptive controller is implemented in parallel, and the effectiveness of the weighting parameters in changing the balance between the transmitted forces and rotor vibrations is demonstrated experimentally. [DOI: 10.1115/1.4001060]

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title:	Journal of Engineering for Gas Turbines and Power
Publisher:	ASME International
ISSN:	0742-4795
Date:	December 2010
Volume:	Vol.132
Number:	No.12
Number of Pages:	7
Page Range:	article no. 122503
Identification Number:	10.1115/1.4001060
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC)
Grant number:	GR/S64448/01 (EPSRC)
URI:	http://wrap.warwick.ac.uk/id/eprint/4559

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