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• W2344658545 abstract "This paper proposes feedback control strategies for the mitigation of torsional stick-slip oscillations in drilling systems using drag bits. Herein, we employ a model for the coupled axial-torsional drill-string dynamics in combination with a rate-independent bit-rock interaction law including both cutting and frictional effects. Using a singular perturbation and averaging approach, we show that the dynamics of this model generate an apparent velocity-weakening effect in the torque-on-bit, explaining the onset of torsional stick-slip vibrations. Based on this dynamic analysis, the (decoupled) torsional dynamics can be described by a delay-differential equation with a state-dependent delay. Using this model, we propose both state- and output-feedback control strategies for the mitigation of torsional stick-slip oscillations, where the latter strategy uses surface measurements only. The effectiveness of the proposed approaches is shown in a simulation study." @default.
• W2344658545 created "2016-06-24" @default.
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• W2344658545 date "2016-09-01" @default.
• W2344658545 modified "2023-10-14" @default.
• W2344658545 title "Analysis and Control of Stick-Slip Oscillations in Drilling Systems" @default.
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• W2344658545 doi "https://doi.org/10.1109/tcst.2015.2502898" @default.
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