Control of Stick-slip Oscillations in Oil Well Drill Strings Using the Back-stepping Technique
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This paper deals with the problem of suppression of stick-slip oscillations in oil well drill-strings. The backstepping technique is used to design two control schemes for the system. The first controller is a typical backstepping controller; the second controller is a sliding back-stepping controller. Moreover, a reduced order observer is proposed to estimate the unmeasurable states of the system. Simulation results of the two proposed control schemes with and without the observer, indicate that both control schemes work well.
