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Research Papers: Gas Turbines: Structures and Dynamics

Experiments on the Transient Performance of an Adaptive Multi-Objective Controller for Rotating Machinery

[+] Author and Article Information
M. Necip Sahinkaya1

Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UKensmns@bath.ac.uk

Abdul-Hadi G. Abulrub

Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, UK

Patrick S. Keogh, Clifford R. Burrows

Department of Mechanical Engineering, University of Bath, Bath BA2 7AY UK

1

Corresponding author.

J. Eng. Gas Turbines Power 133(2), 022503 (Oct 28, 2010) (7 pages) doi:10.1115/1.4002016 History: Received April 14, 2010; Revised April 27, 2010; Published October 28, 2010; Online October 28, 2010

This paper describes an experimental assessment of the transient performance of a multi-objective adaptive approach to the control of flexible rotors. This is applicable to any arrangement of controllable bearings or actuators. In the case reported here, the rotor is supported by active magnetic bearings. The theory underlying the controller is outlined. The objectives include minimization of the forces transmitted to the base while restricting rotor vibrations to a user-defined limit. A third objective is to prevent rotor contact with the auxiliary bearings, which are used to protect the active elements. These objectives are met by a two-stage weighting strategy followed by the adaptive control of two parameters that automatically and continuously adjust the weightings of individual objective functions to satisfy user-defined performance criteria.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic view of the rotor and magnetic bearings. S1,…,S8 indicate the locations of eight displacement sensors.

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Figure 2

Block diagram of the multi-objective recursive adaptive controller

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Figure 3

L-shaped weighting parameters

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Figure 4

Adaptive controller for β and γ

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Figure 5

Effect of weighting parameters (a) β and (b) γ on the performance indices; ∗: JQ, ○: JT, and ◻: JM

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Figure 6

Transient performance of the β adaptive controller when JQ,max is increased from 40 μm to 80 μm

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Figure 7

Transient performance of the β adaptive controller when JQ,max is increased from 60 μm to 80 μm

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Figure 8

Transient performance of the γ adaptive controller when JM,max is reduced from 60 μm to 40 μm

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Figure 9

Transient performance of the γ adaptive controller when JM,max is set to zero

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Figure 10

Transient performance of the β and γ adaptive controllers when JQ,max is reduced from 80 μm to 40 μm with JM,max=60 μm

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