Control of friction-induced torsional vibrations in drilling

Farooq Kifayat Ullah
The thesis deals with the control of torsional oscillations in drill strings. Self-excited torsional oscillations occur due to friction and complex coupling between the torsional,axial and lateral drill string dynamics. The focus is on the control of friction-induced torsional oscillations in the drill string. In this work the torsional oscillations caused by the Stribeck effect of friction are studied using an experimental setup that is designed and built for the purpose. The experimental setup is...
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