Abstract
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.
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Masoumeh Azadegan was born in 1985 in Babol, Iran. She received her B.Sc. degree in Control Engineering from K.N. Toosi University of Technology at in 2007, and her M.S. degree in Control Engineering from Tarbiat Modares university, Tehran, Iran in 2010. She is currently pursuing a Ph.D. degree in Control Engineering from Tarbiat Modares University. Her research interests include teleoperation, networked control systems, time-delayed systems and Markovian jump systems.
Mohammad T. H. Beheshti was born in 1956 in Tehran, Iran. He received his B.S. in Electrical Engineering from the University of Nebraska at Lincoln in 1984, his M.S. and Ph.D. in Control Engineering from the Wichita State University, Wichita Kansas, in 1987 and 1992, respectively. Dr Beheshti has been a faculty of the EE department, Malek Ashtar university of technology Isfahan, Iran from 1992 to 1994. He is now an associate professor of the ECE department, Tarbiat Modares University, Tehran, Iran since 1995. Dr. Beheshti’s research interest are in modeling and control of singular perturbation systems, modeling and control of communication and computer networks, congestion control and more.
Babak Tavassoli received his B.S. in Electronics Engineering in 1998 from the University of Tehran. He received his M.S. and Ph.D. degrees in Control Engineering from the same university in 2001 and 2009 respectively. He has been involved in developing fieldbus systems for industrial automation at Farineh Fannavar Co. since 2003. From 2009 to 2010 he was with the Research Institute of Petroleum Industry in Iran. He joined the Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology in 2010 where he is currently an Assistant Professor. He has published several papers. Currently, his research is mainly focused on Networked Interconnected Systems, Hybrid Systems, Industrial Automation and Constrained Model Predictive Control.
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Azadegan, M., Beheshti, M.T.H. & Tavassoli, B. Using AQM for performance improvement of networked control systems. Int. J. Control Autom. Syst. 13, 764–772 (2015). https://doi.org/10.1007/s12555-014-0012-9
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DOI: https://doi.org/10.1007/s12555-014-0012-9