Stabilization of Networked Control System with Time Delays and Data-packet Losses

doi:10.3166/ejc.13.343-350

European Journal of Control

Volume 13, Issue 4, 2007, Pages 343-350

https://doi.org/10.3166/ejc.13.343-350 Get rights and content

In this paper, we provide experimental results in the application of the results of [4]. Based on the theoretic work in [4], we propose an estimator-based delaycompensation algorithm to stabilize a networked control system (NCS) with network-induced stochastic time delays, data-packet losses, and out-of-order data-packet transmissions. With the p-sampling-period delay upper bound, the NCS can also accommodate up to p – 1 successive packet losses. We also derive sufficient conditions for the stability of the NCS. The feasibility and effectiveness of the theoretic results of [4] is verified experimentally using an NCS test bed incorporating an open-loop unstable ball magnetic-levitation (maglev) system we constructed.

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Citation Excerpt :
These variations arise in the messages transmission and consequently in the sampling and actuation times. Besides the delays, the NCSs are subject to the occurrence of faults, packet losses (Ji & Kim, 2007; Okano & Ishii, 2014; Peng & Han, 2016; Wang & Yang, 2010; Yu, Wang, Chu, & Hao, 2005), queuing and disordering of the messages, communication constraints (Che, Wang, & Yang, 2012; Franzè & Tedesco, 2014; Wang & Li, 2016). The combination of these phenomena affects the control system therefore requiring careful controller design so that the performance of the closed loop is not unnecessarily degraded.
In this paper, the potential improvement in performance of an NCS (Networked Control System) subject to variable delays controlled by means of an adaptive system is analyzed. An adaptive Smith Predictor has been used to compensate the effects of varying delays measured on the network. The NCS, closed over the Internet, has been implemented using a platform called NCS-CMUF, composed of local and remote stations. The plant used to carry out the experimental tests is consisted of an optical oven in which the luminosity loop is the main controlled variable whose time constant lies in the range of milliseconds. This paper highlights the importance of synchronization between the clocks of the local and remote stations to perform consistent measurements of network delays, in order to provide an active compensation of the effects of delays. The results show the effectiveness of adaptive Smith Predictor in coping with different delays and the performance improvements achieved with the proposed scheme.
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Stabilization of Networked Control System with Time Delays and Data-packet Losses

Comput and Struct

Autom

Stabilizing a linear system with quantized state feedback

IEEE Trans Autom Control

Model-based networked control systems stability

ISIS Technical Report ISIS-2002-001