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A New Efficient Adaptive Control of Torsional Vibrations Induced by Switched Nonlinear Disturbances Cover

A New Efficient Adaptive Control of Torsional Vibrations Induced by Switched Nonlinear Disturbances

Open Access
|Jul 2019

Abstract

Torsional vibrations induced in drilling systems are detrimental to the condition of the machine and to the effectiveness of the engineering process. The cause of vibrations is a nonlinear and unknown friction between a drill string and the environment, containing jumps in its characteristics. Nonlinear behaviour of the friction coefficient results in self-excited vibration and causes undesirable stick-slip oscillations. The aim of this paper is to present a novel adaptive technique of controlling vibrating systems. The scheme is based on the linear quadratic regulator and uses direct measurements of the friction torque to synthesize its linear dynamic approximation. This approach allows generating a control law that takes into account the impact of the friction on the system dynamics and optimally steers the system to the desired trajectory. The controller’s performance is examined via numerical simulations of the stabilization of the drilling system. The proposed solution outperforms the comparative LQG regulator in terms of the minimization of the assumed cost functional and the overall stability of the control system under the nonlinear disturbance.

DOI: https://doi.org/10.2478/amcs-2019-0021 | Journal eISSN: 2083-8492 | Journal ISSN: 1641-876X
Language: English
Page range: 285 - 303
Submitted on: Apr 4, 2018
Accepted on: Mar 2, 2019
Published on: Jul 4, 2019
Published by: University of Zielona Góra
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2019 Maciej Wasilewski, Dominik Pisarski, Robert Konowrocki, Czesław I. Bajer, published by University of Zielona Góra
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.