
Finite-time bounded and boundedness of networked control
systems with random time delay and packet dropout
Yeguo Sun
1
1. School of Finance, Huainan Normal University, Huainan 200234, P. R. China
Abstract: This paper focuses on the problem of finite-time control for a class of networked control system (NCS) in presence of
random time delay and packet dropout, and provides some main results which are sufficient conditions for finite-time bounded
via state feedback. Firstly, the NCS with random time delay and packet dropout are modeled as linear systems by using certainty
equivalence property and random process. Secondly, the sufficient conditions for finite-time boundedness and stabilization of the
underlying systems, based on finite-time stability theory combined with linear matrix inequalities (LMIs) theory, are derived in
form of linear matrix inequalities (LMIs). Finally, a numerical example is provided to illustrate the effectiveness of the proposed
methods.
Key Words: Networked control systems, linear matrix inequalities, finite-time boundedness
1 Introduction
Networked control systems (NCSs) are systems exchang-
ing data over a wired or wireless communication network
with spatially distributed sensor, actuator and controller n-
odes. Recently, considerable interest has been attracted by
NCSs due to their wide applications in different areas, such
as mobile sensor networks, remote surgery, automated high-
way systems, unmanned aerial vehicles and multi-agent sys-
tems [1-4]. NCSs, in contrast to classical feedback control
systems, have many advantages such as low cost, high flexi-
bility, ease of installation and maintenance. However, many
challenging problems result from the limited communication
resources and unreliability of communication channel, such
as network-induced delay, quantization, packet dropout, etc,
which make the NCSs analysis and synthesis more complex;
see [5-8] and the references therein.
On the other hand, most of the existing results related to
the stability of NCSs focus on asymptotic stability. Asymp-
totic stability is generally enough for practical applications,
but in some cases, large values of the state are not acceptable
[9-11], for example, in the presence of saturations. In these
cases, we should take finite-time stability (FTS) into consid-
eration [12-13]. The finite-time control problem of a class
of networked control systems with time delay was studied
in [14]. Some sufficient conditions for finite-time stabili-
ty of networked control systems with packet dropout were
suggested in [15-17]. However, controller design methods
are not provided. The finite-time stabilization problems of a
class of networked control systems with bounded Markovian
packet dropout were investigated in [18-19]. The authors in-
spired by [18-19] discussed finite-time boundedness prob-
lems of a class of networked control systems with bound-
ed packet dropout in [20]. The stochastic finite-time stabi-
lization and H
∞
control problem for one family of linear
discrete-time systems over networks with packet loss are in-
vestigated in [21]. In [22], networked control system with
both network-induced delay and packet dropout is modeled
This work was partly supported by the supported by the National Nat-
ural Science Foundation of China under Grant No. 61403157 and the U-
niversity Special Foundation for Young Scientists of Anhui Province No.
gxyqZD2017074
as a discrete-time linear system with a time-varying, bound-
ed state delay, and the finite-time stability analysis is pro-
vided. However, the obtained results are given in the form
of bilinear matrix inequalities (BMIs), which makes the con-
troller design become more difficult.
In the authors’ opinion, the finite-time stabilization and
boundedness problems of NCSs in presence of time delay
and packet dropout have not been fully studied and still have
a long way to go, although results related to systems over
networks with packet loss or network-induced delay are re-
ported in the existing literature. We discuss the finite-time
control of NCSs with time delay and packet dropout in the
paper due to the inspiration from the existing literature. The
main contributions of the paper are listed as follows: (1)
Definitions of finite-time stable and bounded are extended
to networked control systems with time delay and packet
dropout. (2) Sufficient conditions for finite-time bounded-
ness in terms of linear matrix inequalities formulation are
given.
The rest of this paper is organized as follows. In Section 2,
the NCSs with random time delay and packet dropout, based
on the certainty equivalence property and random process,
are modeled as linear systems. In Section 3, the finite-time
boundedness conditions for NCSs with random time delay
and packet dropout are obtained in form of LMIs. In Section
4, a numerical example is provided to illustrate the effective-
ness of our results, and Section 5 is conclusion.
2 Formatting Instructions
The NCS is composed of three parts: the controlled plant,
the controller, and the lossy communication network, and
the framework is shown in Figure 1. The controlled object
considered in this paper can be expressed as
˙x(t)=Ax(t)+Bu(t)+Gw(t) (1)
Due to the existence of packed dropouts and networked-
induced delays, the overall NCS in Figure 1 can be described
as
˙x(t)=Ax(t)+η(t)Bu(t − τ (t)) + Gw(t) (2)
where x(t) ∈ R
n
is the system variable, u(t) ∈ R
m
is the
control input, and w(t) is the external interference. A is the
Proceedings of the 36th Chinese Control Conference
Jul
26-28, 2017, Dalian, China
7611