Abstract
smooth (PWS) systems can be ineffective if an additional bifurcationanalysis is not made. Due to the presence of discontinuities,PWS systems present a wide variety of standard and non-standard bifurcations.Safe ranges of system and controller parameters can be establishedlest these bifurcations appear. This is studied by means of asimplified torsional model of an oilwell drillstring of three degrees offreedom (DOF). A PID-type controller is applied. The bifurcation analysisof the open-loop and the closed-loop systems is used to choose thecontroller parameters for which non-desired bit sticking situations areavoided. The control goal of driving the rotary velocities to a constantpositive value is achieved despite the existence of a sliding motion.
Original language | English |
---|---|
Title of host publication | Lecture Notes on Computer Science, LNCS 4416 |
Subtitle of host publication | Hybrid Systems Computation and Control, HSCC |
Place of Publication | Berlin Heidelberg |
Publisher | Springer Nature |
Pages | 736-740 |
Number of pages | 5 |
Edition | 1st |
ISBN (Print) | 978-3-540-71492-7 |
Publication status | Published - 2007 |
Keywords
- Discontinuous systems
- Sliding motions
- Bifurcation analysis
- Oilwell drillstrings
- Dry friction
- Stick-slip oscillations