Smart Stick-Slip Oscillation Removal through Acoustic Communication and Predictive Estimator

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Mahlooji, Malihe | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48843 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Hossein Khalaj, Babak; Farhadi, Alireza
Abstract:
To suppress stick-slip oscillations a controller is designed. However, because the lack of rotary speed at the surface, two approaches to implement this controller is considered: 1) Using an observer to estimate the rotary speed, 2) Using acoustic communication. To implement the second method, we confront several challenges including delay in the feedback loop and noise in communication system. In this thesis, a controller is designed based on prediction of the current rotary speed using its delayed value. It is shown that this system is less sensitive to uncertainty in system parameters compared to the controller based on observer. The performance of both systems in terms of settling time, maximum controlling signal and absolute of error signal is compared for 10 and 20 percent uncertainty in parameters. It is shown that a controller based on prediction and using acoustic communication enhances the performance of the system
Keywords:
Delayed Feedback Control ; Predictive Control ; Predictor Observer ; Feedback Loop ; Control with Delay ; Oscillations Removal

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