Design and Investigation of a Nonlinear Damper Based on Energy Dissipation through Shock and Dry Friction to Suppress Critical Self-Excited Vibrations in Drilling Systems

In this paper, a passive damper based on energy dissipation through shock and dry friction (shock-friction damper) is investigated regarding its design effectiveness for damping self-excited torsional vibrations similar to those occurring in deep drilling. The results are compared the of conventional dampers. different operational drilling parameters that change during process, such as weight bit rotary speed bit, analyzed. Two linear reduced order models drill string complex finite element model set up. One using component mode synthesis one identified critical mode. A lumped mass represents inertia forcedly connected nonlinear damper. combined system introduced investigate dynamic motion stability. Particular focus flow within contact. semi-analytical solution derived harmonic balance method used effect various designs parameters. Herein, modal properties well examined stability system. Finally, capability mechanism suppress self-excitation due bit–rock interaction discussed, recommendations made with respect placement