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Low complexity controllers for vibrations damping in drilling systems

Abstract : In oilwell drillstring systems, vibrations represent an important source of economic losses; drill bit wear, pipes disconnection, borehole disruption and prolonged drilling time, are only a few examples of consequences associated with drilling vibrations. In this paper a control-oriented model of torsional vibrations occurring in rotary drilling process is proposed. More precisely, a wave equations with weak damping term is considered. An appropriate stabilizing controller with a reduced number of parameters is proposed for damping such torsional vibrations. Such a controller allows to further explore the effect of multiple roots with maximal admissible multiplicity for linear neutral system with a single delay. An illustrative example completes the presentation. © 2019 American Automatic Control Council.
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Islam Boussaada, Hugues Mounier, Silviu-Iulian Niculescu. Low complexity controllers for vibrations damping in drilling systems. ACC 2019 - American Control Conference, Jul 2019, Philadelphia, United States. pp.5228-5233, ⟨10.23919/acc.2019.8815371⟩. ⟨hal-02328847⟩



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