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Modelling and identification for control of gas bearings

Theisen, Lukas R. S.; Niemann, Hans Henrik; Santos, Illmar F.; Galeazzi, Roberto; Blanke, Mogens
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2365535
Date
2015
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  • Institutt for teknisk kybernetikk [2849]
  • Publikasjoner fra CRIStin - NTNU [26648]
Original version
Mechanical systems and signal processing 2015   doi:10.1016/j.ymssp.2015.09.016
Abstract
Gas bearings are popular for their high speed capabilities, low friction and clean operation, but suffer from poor damping, which poses challenges for safe operation in presence of disturbances Feedback control can achieve enhanced damping but requires low complexity models of the dominant dynamics over its entire envelope of operation. Models from first principles are complex and sensitive to parameter uncertainty. This paper presents an experimental technique for ”in situ” identification of a low complexity model of a rotor–bearing–actuator system and demonstrates identification over relevant ranges of rotational speed and gas injection pressure This is obtained using Parameter-varying linear models that are found to capture the dominant dynamics. The approach is shown to be easily applied and to suit subsequent control design. Based on the identified models, decentralised proportional control is designed and shown to obtain the required damping in theory and in a laboratory test rig.
Publisher
Elsevier
Journal
Mechanical systems and signal processing

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