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Torsional stick-slip vibrations decrease the performance and reliability of drilling systems used for the exploration of energy and mineral resources. In this work, we present the design of a nonlinear observer-based output-feedback control strategy to eliminate these vibrations. We apply the controller to a drill-string model based on a real-life rig. To(More)
1Department of Mechanical Engineering, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands 2Department of Civil, Environmental & Geo-Engineering, University of Minnesota, Minneapolis, USA 3Delft Center for Systems and Control, Delft University of Technology, Delft, The Netherlands 4Well Engineering Design, Nederlandse Aardolie(More)
A design approach of a direct supervisory adaptive fuzzy controller applied to pH control of a neutralization process is presented in this paper. Structure and designs of the controller using this approach will be briefly discussed, which includes fuzzy controller comprising a number of fuzzy systems constructed from the control knowledge as well as a(More)
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