Thesis-2003-Batako.pdf (7.17 MB)
Download fileA self-exciting system for percussive–rotary drilling
thesis
posted on 2018-07-23, 15:35 authored by Andre D.L. BatakoA 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