Abstract
The role of time delay in the control processes aimed at mitigating stick-slip vibration
in drill-strings, is of paramount importance. Its influence on the controlled system’s settling
time cannot be understated; indeed, it can lead to significant consequences such as controller
instability. In this study, a numerical analysis was conducted, initially a sliding mode control
was employed to suppress stick-slip vibration in drill-string. Then we explore a spectrum of
time delay values alongside varying reference angular velocities. The results of this investigation suggest a critical finding: the controller’s susceptibility to limit cycles is notably heightened in the presence of time delay and its experiences a decline when faced with fluctuating reference angular velocities. Despite this degradation, it is noteworthy that the system does not always reach a state of complete instability. These insights are invaluable, offering essential considerations for the development of robust control strategies. Addressing the challenges posed by time delay induced issues in suppressing stick-slip vibration during drilling operations requires a nuanced approach, taking into account the intricacies highlighted in this study.
in drill-strings, is of paramount importance. Its influence on the controlled system’s settling
time cannot be understated; indeed, it can lead to significant consequences such as controller
instability. In this study, a numerical analysis was conducted, initially a sliding mode control
was employed to suppress stick-slip vibration in drill-string. Then we explore a spectrum of
time delay values alongside varying reference angular velocities. The results of this investigation suggest a critical finding: the controller’s susceptibility to limit cycles is notably heightened in the presence of time delay and its experiences a decline when faced with fluctuating reference angular velocities. Despite this degradation, it is noteworthy that the system does not always reach a state of complete instability. These insights are invaluable, offering essential considerations for the development of robust control strategies. Addressing the challenges posed by time delay induced issues in suppressing stick-slip vibration during drilling operations requires a nuanced approach, taking into account the intricacies highlighted in this study.
| Original language | English |
|---|---|
| Publication status | Accepted/In press - 9 Apr 2024 |
| Event | 7th IFAC Conference on Analysis and Control of Nonlinear Dynamics and Chaos - London, United Kingdom Duration: 5 Jun 2024 → 7 Jun 2024 https://acndc2024.org/ |
Conference
| Conference | 7th IFAC Conference on Analysis and Control of Nonlinear Dynamics and Chaos |
|---|---|
| Country/Territory | United Kingdom |
| City | London |
| Period | 5/06/24 → 7/06/24 |
| Internet address |
Keywords
- time delay
- sliding mode control
- drill-string
- stick-slip