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Babak Tavassoli,Parviz Jabehdar-Maralani,Nasser Rezaee 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.4
The problem of using acknowledgement messages for reducing the effects of packet loss on the performance of a networked control system (NCS) is considered. A sampling and transmission strategy is proposed and the model of the NCS with a Markovian communication state is precisely determined which provides the necessary tools for exact NCS analysis and design. The results can be used efficiently to design simple and practical controllers like PID by minimizing the value of a per-formance measure. During an example, an H∞ performance measure of an NCS is optimized to design controllers, compare between them and evaluate them from both control and communication points of view.
Using AQM for Performance Improvement of Networked Control Systems
Masoumeh Azadegan,Mohammad T. H. Beheshti,Babak Tavassoli 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.3
This paper presents a new scheme to jointly control the plant and the network to improve the overall performance of the networked control system (NCS). Using an analytical transmission control protocol (TCP) model for the network, an active queue management (AQM) is designed to achieve desired queue length. This leads to keeping network induced delay and its variation to be small enough to improve the overall performance of the NCSs. By augmenting the TCP communication model with the control system equations, the closed loop system is transformed to a state-dependent delay differential equation (SDDDE). Then using the Lyapunov-Krasovskii method, a sufficient condition for the stability of this class of systems is presented in terms of linear matrix inequality (LMI). Simulation results are presented and compared to some other methods, the superiority of the proposed approach is shown.