2024 |
Hamin Chang / Donghyeon Song / Stephan Trenn / Hyungbo Shim Disturbance Observer with Switched Output Redefinition for Robust Stabilization of Non-Minimum Phase Linear Systems Proceedings Article In: 2024 IEEE 63rd Conference on Decision and Control (CDC), IEEE, Milan, Italy, 2024. Abstract | Links | BibTeX | Tags: Disturbance observer, Non-minimum phase, Robust stabilization @inproceedings{nokey,Q-filter-based disturbance observer (DOB) has emerged as a powerful robust control technique renowned for its effectiveness in mitigating disturbances and addressing plant uncertainties. Despite its advantage, a key limitation of the Q-filter-based DOB lies in its requirement for plants to be of minimum phase. In this paper, we introduce an approach allowing the utilization of the Q-filter-based DOB as a stabilizing controller for non-minimum phase linear systems based on switched output redefinition of the systems. By redefining the output of systems to be controlled periodically, the approach stabilizes unstable internal dynamics of the systems as well as the original output. The proposed method is verified by an illustrative example. |
2020 |
Abhisek K. Hehera / Hyungbo Shim Robust feedback stabilization using high-gain observer via event triggering Journal Article In: International Journal of Robust and Nonlinear Control, vol. 30, no. 5, pp. 2097-2112, 2020, ISSN: 1049-8923. Abstract | Links | BibTeX | Tags: Event-triggered control, Output feedback, Robust stabilization @article{Behera20b,In this article, the problem of robust output feedback stabilization of single-input single-output nonlinear systems is studied in the event-triggering framework. In this work, an event-triggered output feedback law based on a high-gain observer is constructed, which guarantees the stability of closed-loop system. First, the high-gain observer with a triggering scheme is designed to estimate the plant state in the presence of external disturbances subject to any satisfactory accuracy of the estimation error. The observer-based triggering mechanism decides the transmission of plant output to the observer by observing a certain event condition. Similarly, another triggering mechanism is designed using the estimated state of observer that triggers the control signal to be updated only when it is satisfied. Under this proposed event-triggering framework, the stability of closed-loop system is then analyzed. Here, we provide the simplified design technique, in which the high-gain parameter and the triggering thresholds can be selected independently to achieve any desired bound for the plant trajectory. The results are finally demonstrated through simulation of a numerical example. |
0000 |
Abhisek K. Hehera/ Hyungbo Shim Robust feedback stabilization using high-gain observer via event triggering Journal Article In: International Journal of Robust and Nonlinear Control, vol. 30, no. 5, pp. 2097-2112, 0000, ISSN: 1049-8923. Abstract | Links | BibTeX | Tags: Event-triggered control, Output feedback, Robust stabilization @article{Behera20,In this article, the problem of robust output feedback stabilization of single-input single-output nonlinear systems is studied in the event-triggering framework. In this work, an event-triggered output feedback law based on a high-gain observer is constructed, which guarantees the stability of closed-loop system. First, the high-gain observer with a triggering scheme is designed to estimate the plant state in the presence of external disturbances subject to any satisfactory accuracy of the estimation error. The observer-based triggering mechanism decides the transmission of plant output to the observer by observing a certain event condition. Similarly, another triggering mechanism is designed using the estimated state of observer that triggers the control signal to be updated only when it is satisfied. Under this proposed event-triggering framework, the stability of closed-loop system is then analyzed. Here, we provide the simplified design technique, in which the high-gain parameter and the triggering thresholds can be selected independently to achieve any desired bound for the plant trajectory. The results are finally demonstrated through simulation of a numerical example. |
List of English Publication
2024 |
Disturbance Observer with Switched Output Redefinition for Robust Stabilization of Non-Minimum Phase Linear Systems Proceedings Article In: 2024 IEEE 63rd Conference on Decision and Control (CDC), IEEE, Milan, Italy, 2024. |
2020 |
Robust feedback stabilization using high-gain observer via event triggering Journal Article In: International Journal of Robust and Nonlinear Control, vol. 30, no. 5, pp. 2097-2112, 2020, ISSN: 1049-8923. |
0000 |
Robust feedback stabilization using high-gain observer via event triggering Journal Article In: International Journal of Robust and Nonlinear Control, vol. 30, no. 5, pp. 2097-2112, 0000, ISSN: 1049-8923. |