State Dependent Delayed Drill-string Vibration: Theory, Experiments and New Model

We have reviewed the development and the analysis of the coupled two degrees-of-freedom model of drill-string vibration, which assumes a state-dependent time delay and a viscous damping for both the axial and torsional vibration. This model corrects the instability deficiencies of the previous model...

Full description

Saved in:
Bibliographic Details
Published in:Procedia IUTAM 2017, Vol.22, p.39-50
Main Authors: Wiercigroch, M., Nandakumar, K., Pei, L., Kapitaniak, M., Vaziri, V.
Format: Article
Language:English
Subjects:
drill-string
experiments
modelling
state dependent delay
vibration
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We have reviewed the development and the analysis of the coupled two degrees-of-freedom model of drill-string vibration, which assumes a state-dependent time delay and a viscous damping for both the axial and torsional vibration. This model corrects the instability deficiencies of the previous models but it is still based on a uniform angular distribution of blades on a drill-bit, which can lead to unrealistic regenerative types of instability. However, the model sheds some lights on the origin and the interplay between stick-slip and bit-bounce, the dangerous dynamic phenomena encountered during rotary drilling. The experimental rig developed by the Centre of Applied Dynamics Research at the University of Aberdeen is used to show some shortcomings of this model and to develop a new more realistic one. The new model assuming a non-uniform distribution of blades for drag type drill-bits is proposed.
ISSN:2210-9838
2210-9838
DOI:10.1016/j.piutam.2017.08.007