Modelling of Rotor-gas bearings for Feedback Controller Design

Lukas Roy Svane Theisen, Hans Henrik Niemann

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Abstract

Controllable rotor-gas bearings are popular oering adaptability, high speed operation, low friction and clean operation. Rotor-gas bearings are however highly sensitive to disturbances due to the low friction of the injected gas. These undesirable damping properties call for controllers, which can be designed from suitable models describing the relation from actuator input to measured shaft position. Current state of the art models of controllable gas bearings however do not provide such relation, which calls for alternative strategies. The present contribution discusses the challenges for feedback controller design using the state of the art method, and an alternative data driven modelling approach is pursued based on Grey-Box system identication. The method allows development of models of the rotor-gas bearing suitable for controller design, which can be identied from data over the range of operation and are shown to accurately describe the dynamical behaviour of the rotor-gas bearing. Design of a controller using the identied models is treated and experiments verify the improvement of the damping properties of the rotor-gas bearing.
Original languageEnglish
Book seriesJournal of Physics: Conference Series (Online)
Volume570
Number of pages10
ISSN1742-6596
DOIs
Publication statusPublished - 2014
Event11th European Workshop on Advanced Control and Diagnosis - HTW Berlin, University of Applied Sciences, Berlin, Germany
Duration: 13 Nov 201414 Nov 2014

Conference

Conference11th European Workshop on Advanced Control and Diagnosis
LocationHTW Berlin, University of Applied Sciences
CountryGermany
CityBerlin
Period13/11/201414/11/2014

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