Eventos Anais de eventos
DINAME2019
DINAME2019
Dynamic analysis and control of drill strings using state-space method
Submission Author:
Maryam Ghandchi Tehrani , UK , United Kingdom
Co-Authors:
Maryam Ghandchi Tehrani, Thiago Ritto
Presenter: Maryam Ghandchi Tehrani
doi://10.26678/ABCM.DINAME2019.DIN2019-0130
Abstract
In this paper, active vibration control of a drill string is considered. A discretized drill string is provided where only torsional motion is considered. The dynamic equations are presented in the form of state-space, taking into account the nonlinear behaviour due to the nonlinear bit-rock interaction. The eigenvalues of the linearized system and its the stability map are obtained for different values of imposed speed at the top and weight-on-bit. Active vibration control strategy in the form of eigenvalue assignment is considered to assign the poles of the linearized model to prescribed locations to reduce the amplitude of torsional oscillation. The response of the system with and without the controller is compared and the performance of the control system in terms of stick-slip motion presented very good results.
Keywords
stability, stick-slip mitigation, Active control, drill-string dynamics, nonlinear bit-rock interaction
