Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Nonlinear Dynamic Analysis of Torsional Friction-Induced Vibrations
Submission Author:
Ingrid Pires Macedo Oliveira dos Santos , RJ
Co-Authors:
Ingrid Pires Macedo Oliveira dos Santos, Bruno Cesar Cayres, Hans Ingo Weber
Presenter: Ingrid Pires Macedo Oliveira dos Santos
doi://10.26678/ABCM.COBEM2019.COB2019-1627
Abstract
Torsional vibration is present in most drilling routines, eventually reaching the stick-slip phenomenon. This type of vibration results from the nonlinear interaction between drill bits and rocks. Despite the complexity of the bit-rock interaction, researches often treat the relationship between torque and bit velocity as dry friction in a slender system. This contribution utilizes data from a test rig, capable of reproducing the torsional behavior experienced by drill strings, with simple brake devices to introduce friction, disturbing the rotating motion. We model the rig as an actuated torsional pendulum for the numerical investigation. Then, we compare experimental and numerical results to justify the model. Lastly, using the validated mathematical model, we perform a stability analysis to identify stable solutions of the system.
Keywords
torsional vibrations, stick-slip, drill-string dynamics, stability analysis
