Loughborough University
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A self-exciting system for percussive–rotary drilling

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posted on 2018-07-23, 15:35 authored by Andre D.L. Batako
A dynamic model for a new principle of self-excited percussive–rotary drilling is presented. The system uses the stick-slip phenomenon to generate an impact action superimposed on the drilling process. This is a strongly nonlinear mechanical system with two-degrees-of-freedom, in which friction-induced vibration is used for excitation of impacts. The model has to take account of the returning effect that the impacts have on the parameters of stick-slip motion. The model incorporates friction force as a function of sliding velocity, where the self-excitation of coupled vibration of the rotating bit and the striker tend to a steady-state periodic cycle. Dynamic coupling of vibro-impact action with the stick-slip process brings innovative adaptive features into the drilling process. [Continues.]


Loughborough University, Faculty of Engineering. British Gas Technology Research Centre.



  • Mechanical, Electrical and Manufacturing Engineering


© A.D.L. Batako

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.


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    Mechanical, Electrical and Manufacturing Engineering Theses