Eventos Anais de eventos
DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
Active Control of drill-string torsional dynamics
Submission Author:
Thiago Ritto , RJ
Co-Authors:
Maryam Ghandchi Tehrani, Thiago Ritto
Presenter: Thiago Ritto
doi://10.26678/ABCM.DINAME2017.DIN17-0197
Abstract
This paper deals with the active vibration control of the drill-string torsional dynamics. The drill-spring is modelled as a two degree-of-freedom system: the rotations at the top and at the bit of the drill string. An external controlled torque is applied at the top of the drill-string. The nonlinear interaction between the rock and the bit is included in the model, and it is a function of the bit rotation, friction, rock properties and axial load. The control strategy employed is the PD-control strategy and the results are compared with the system with imposed speed at the top. The torsional stability for different weight-on-bit values and top speeds are analyzed. It is shown that the control strategy applied increases the stability region of the system, but more investigations are required.
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