posted on 2018-07-23, 15:35authored byAndre 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.]
Funding
Loughborough University, Faculty of Engineering. British Gas Technology Research
Centre.
History
School
Mechanical, Electrical and Manufacturing Engineering
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/
Publication date
2003
Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.