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Modelling and robust stability of networked control systems with packet reordering and long delay. (English) Zbl 1178.93110

Summary: Modelling and robust stability of Networked Control Systems (NCS) are discussed. Considering the existence of packet reordering and network-induced delay, a new mathematical model of NCS whose network-induced delay is longer than one sampling period is obtained, which can fully describe packet reordering and effectively eliminate the impact of packet reordering on the performance of NCS such that the newest control input can be executed by the actuator. Based on this model, the time-varying NCS is converted into an uncertain discrete linear system with multi-step delay in terms of matrix theory. Furthermore, a sufficient condition for robust stability of NCS is presented. Linear matrix inequality approach has been employed to solve the controller design problems. Numerical examples are compared with previous schemes to demonstrate the effectiveness of the proposed method.

MSC:

93D09 Robust stability
93A30 Mathematical modelling of systems (MSC2010)
15A39 Linear inequalities of matrices
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