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Transactions of the Institute of
Measurement and Control
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DOI: 10.1177/0142331218756728
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Disturbance-observer-based control for
time-delay Markovian jump systems
subject to actuator saturation
Xianwen Gao
1
,QianGao
1
, Wenhai Qi
2
and Yonggui Kao
3
Abstract
This paper is concerned with disturbance-observer-based control for Markovian jump systems with time delay and actuator saturation. By virtue of the
disturbance-observer-based control technique and an appropriate mode-dependent Lyapunov–Krasovskii functional, an anti-disturbance controller is
designed to ensure that the resulting closed-loop systems are stochastically stable, as well as estimation of the domain of attraction. Furthermore,an
iterative optimization method is proposed to acquire the maximum estimate of the domain of attraction by solving a set of linear matrix inequalities.
Finally, a simulation illustrates the effectiveness of the proposed schemes.
Keywords
Time delay, actuator saturation, domain of attraction, linear matrix inequalities
Introduction
As we know, disturbances often exist in most practical pro-
cesses and lead to degradation of system performance. To
ensure stability and pursue performances, the question of how
to reject the disturbances has become a heated topic because
of its importance in both theory and practical applications.
Thus, many methods have been proposed to guarantee
systems with good anti-disturbance performance, such as H
‘
theory (Kchaou et al., 2015; Liu and Lin, 2015), disturbance-
observer-based control (Guo and Cao, 2014), an adaptive
control scheme (Marino and Tomei, 1995) and sliding mode
control (Liu et al., 2016). Among these, disturbance-observer-
based control theory has been applied to many fields for its
high efficiency, practicability and strong robustness, and has
found its applications in computer numerical control (CNC)
machine centres in cutting processes (Chen et al., 1999), table
drive systems (Iwasaki et al., 1999), hard disks (Basseville and
Nikiforov, 2002), missile systems (Guo and Wen, 2011), flight
control (Yang et al., 2013) and system control theory (Guo
and Chen, 2005; Li et al. 2016b, c; Wei et al., 2009, 2012; Wei
et al., 2015; Yao and Guo, 2013; Yao et al., 2014); the basic
idea is that a disturbance observer is constructed and its out-
put employed in feedback compensation. Many interesting
properties have been unravelled for time-delay systems via a
disturbance-observer-based control approach (see, e.g. Guo
and Chen 2005; Li et al., 2016b, c; Wei et al., 2009, 2012; Wei
et al., 2015; Yao and Guo 2013; Yao et al., 2014).
Conversely, as a special class of stochastic and hybrid sys-
tems (Luan et al., 2010; Ren and Zong 2017a, b; Wu et al.,
2017), Markovian jump systems have some advantages in
describing dynamic systems subject to sudden changes, such as
random component failures, working environment changes,
changing subsystem interconnection, unexpected events and
uncontrolled configuration changes, which can be found in
many fields, such as networked control systems (Song et al.,
2013), manufacturing systems (Shen and Buscher, 2012), fault-
detection systems (Ge and Han, 2014) and system theory (Kao
et al., 2014, 2015; Li et al., 2014, 2016a; Li et al., 2016b, c; Qi
et al. 2017a, b, c, 2018; Wang and Zhu, 2017; Wang et al.,
2017a, b; Wu et al., 2014; Yao and Guo, 2013; Yao et al., 2014;
Zhu, 2014, 2017; Zhu and Cao, 2010, 2011, 2012). It is to be
noted that most results on Markovian jump systems have been
obtained under the assumption of completely known transition
rates. However, this assumption is actually questionable and
the cost is probably expensive. For example, in networked con-
trol systems (Liu et al., 2017), the packet dropouts and channel
delays modelled by Markovian chains (Zhang et al., 2005) are
based on the usual assumption that all the transition rates are
completely accessible. However, in almost all types of commu-
nication network, either the variation in delay or the packet
dropouts can be vague and random in different running periods
of networks – all or part of the elements in the desired transi-
tion rate matrix are hard or costly to obtain. Recently, some
results on disturbance-observer-based control for Markovian
1
College of Information Science and Engineering, Northeastern
University, China
2
School of Engineering, Qufu Normal University, Rizhao, China
3
Department of Mathematics, Harbin Institute of Technology, Weihai,
China
Corresponding author:
Xianwen Gao, College of Information Science and Engineering,
Northeastern University, Shenyang 110819, China.
Email: gaoxianwen@mial.neu.edu.cn