Asian Journal of Control, Vol. 15, No. 1, pp. 1 10, January 2013
Published online in Wiley Online Library (wileyonlinelibrary.com). DOI: 10.1002/asjc.366
STABILIZATION OF NONLINEAR NETWORKED PROBABILISTIC
INTERVAL DELAY SYSTEMS WITH SENSOR RANDOM
PACKET DROPOUT
Yong Zhang, Huajing Fang, and Baoxian Wang
ABSTRACT
In this paper, the problem of stabilization for nonlinear networked
systems with probabilistic interval delay and sensor random packet dropout
is investigated. By employing the information of probabilistic distribution
of time-varying delay and considering random sensor packet dropout with
compensation, the nonlinear stochastic delayed system model is established.
Based on the obtained model, by choosing an appropriate Lyapunov function
and utilizing a new discrete Jensen-type inequality, sufficient conditions are
derived to obtain the relation of the maximum allowable delay bound, delay
interval occurrence rate and packet dropout rate to the stochastic stability
of nonlinear networked control systems. Two kinds of design procedures
for output feedback controller are also presented in terms of solving corre-
sponding linear matrix inequalities. Numerical examples are provided to
illustrate the effectiveness and applicability of proposed techniques.
Key Words: Nonlinear networked control systems, random packet dropout,
probabilistic interval delay, linear matrix inequality.
I. INTRODUCTION
Networked control systems (NCSs) are feedback
control systems, in which information is exchanged via
network among control system components (sensor,
controller, actuator, etc.). Compared with conventional
point-to-point system connection, this new networked-
based control scheme reduces system wiring, eases
Manuscript received September 19, 2009; revised July 26,
2010; accepted October 10, 2010.
Y. Zhang is with the College of Information Science and
Technology, Wuhan University of Science and Technology,
Wuhan, Hubei, 430074, China, and he is the corresponding
author (email: zhangyongyq@yahoo.com.cn).
H. J. Fang and B. X. Wang are with the Department of
Control Science and Engineering, Huazhong University of
Science and Technology, Wuhan, Hubei, 430074, China (email:
hjfang@mail.hust.edu.cn; baoxianwang2005@yahoo.com.cn).
This work was supported in part by the National Natural
Science Foundation of China (No. 60874053; No. 60874109).
maintenance and diagnosis, and increases system agility
and reliability [1, 2]. Nevertheless, the introduction
of a communication network also brings some new
problems and challenges, such as network-induced
delay [3–7] and d ata packet dropout [8–10], which all
might be potential sources to poor performance, even
instability.
Different from separately considering the problem
of packet dropout or delay, it is more interesting to deal
with the modelling, analysis and synthesis for NCSs
with both delay and packet dropout. Recently, there has
been significant research into this problem [11–13].The
sampled d ata system m odels were developed in [11],
the maximum allowable delay bounds that guarantee
the existence of stabilising controllers were obtained by
applying the time delay system analysis and synthesis
approach. To deal with the problem of consecutive
packet dropout and delay, [12] utilized an iterative
approach model with the NCSs as switched linear
systems and obtained the stabilization condition within
the given consecutive dropout bound. Note that, when
q
2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society