This thesis is concerned with the analysis of the control design to the nonlinear networked control systems (NCSs).
Ignoring the network connection and cascading actuators, the plant and sensors together, a sampled-data system is obtained. The stabilization problem of nonlinear sampled-data systems is considered under the low measurement rate constraint. Dual-rate control schemes based on the emulation design and discrete-time design approaches respectively are proposed that utilize a numerical
integration model to approximately predict the current state of the plant. It is shown that using the dual-rate control schemes, input-to-state stability property will be preserved for the closed loop sampled-data system in a practical sense.
On the other hand, the networked realization of nonlinear control systems is studied and a model-based control scheme is addressed as a solution to reduce the network traffic and resultantly, to attain a higher performance. The NCSs are modeled as continuous-time systems and sampled-data systems, respectively. Under the proposed
control scheme, a tradeoff between satisfactory control performance and reduction of network traffic can be achieved. It is shown that by using the estimated values, generated by the plant model, instead of true values of the plant, a significant saving in the required bandwidth is achieved and this makes possible stabilization of the
plant even under slow network conditions.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/440 |
| Date | 11 1900 |
| Creators | Liu, Xi |
| Contributors | Lin, Yanping (Mathematical and Statistical Sciences), Marquez, Horacio J. (Electrical and Computer Engineering), Van Roessel, Henry (Mathematical and Statistical Sciences), Fahimi, Farbod (Mechanical Engineering), Antsaklis, Panos J. (Electrical Engineering, University of Notre Dame) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 458106 bytes, application/pdf |
| Relation | X. Liu, H. J. Marquez. Preservation of input-to-state stability under sampling and emulation: multi-rate case. International Journal of Control, 80(12):1944-1953, 2007., X. Liu, H. J. Marquez, and Y. Lin. Input-to-state stabilization for nonlinear dual-rate sampled-data systems via approximate discrete-time model. Automatica, 44(12):3157-3161, 2008. |
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