Torsional Friction-Induced Vibrations in Slender Rotating Structures
Due to the drill-string slenderness, torsional vibration is present in most drilling routines, eventually reaching the stick-slip phenomenon. This torsional vibration results from the nonlinear interaction between drill-bits and rocks. Despite the complexity of the bit-rock interaction, the relationship between torque and bit velocity is often treated as dry friction in a slender system. This contribution utilizes data from a test rig that was designed to offer similar dynamic properties as a drill-string and has a special device to introduce friction disturbing the rotating motion. This test rig is modeled as an actuated torsional pendulum and is used to model numerical approaches for the investigation of the experimental friction. We propose a friction model based on experimental data, and analyze the hysteretic characteristic observed. The experimental results are used to identify the proposed model parameters. Lastly, we compare experimental and numerical results.
Keywordstorsional vibrations stick-slip dry friction hysteretic cycle
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