J Control Theory Appl
2013
11
(4)
623-628
DOI
1O
.1007/s11768-013-2186-8
Nonlinear control
and
synchronization
of
a class of
nonlinear coupled dynamical systems
Wenyan
TANG
1
,时,
Zhihua
QU
2, Xiaoping FAN 1,3, Hui
LONG
1,3
l.
School
o
fI
nfonnation
Sci
巳
nc
巳
and
Engineering
,
Central
South
University
,
Changsha
Hunan
410075
,
China;
2.Department
of
Electrical
Engineering
and
Computer
Scienc
巳,
University
of
C
巳
ntral
Fl
orida
,
Orlando
FL
32816
,
U.S.A.;
3.Hunan
Engineering
Laboratory
for
Advanced
Control
and
Intelligent
Automation
,
Changsha
Hunan
410083
,
China
Abstract:
In
this
pap
巳
r
,
a control prob
1e
m for a
c1
ass
of
nonlin
巳
ar
coupled dynamical systems
is
propos
巳
d
and
a
continuous nonlinear feedback controllaw
is
design
巳
d
using direct Lyapunov method
to
solve the proposed control problem
Moreover
, synchronization problem for a special case of
this
c1
ass
nonlinear coup
1e
d dynamical systems
is
concerned.
Numerical examples
show
the effectiveness
and
advantage of
the
d
巳
signed
continuous nonlinear control
law
and
derived
synchronization result
Keywords:
Nonlin
巳
ar
control; Synchronization; Lyapunov method
1 Introduction
In the past few
ye
盯
s
,
there have been a large number
of
studies focused
on
the control
of
arrays
of
coupled
nonlin
巳
ar
systems.
It
has numerous applications in many disciplines
such as in physics and
engin
巳巳
ring
to cite
just
a few [1-8]. In
engineering
, there is a strong demand for control
of
power
systems
, traffic control and so on. In physics, a growing in-
terest in application
of
control theory to studying the dy-
namics
of
complex systems has given rise to a new area
gradually becoming known as ‘cybemetical physics' [9].
One
of
the
most
important coupled nonlinear systems is
Frenkel-Kontorova (FK) model which describes a chain
of
interconnected parti
c1
es. This model is well known because
it can characterize many different complex physical phe-
nomena: tribology
, charge-density waves,
Jos 巳
phson
junc-
tions
and
so
on
[10
一
12].
This paper considers the problem
of
controlling average behavior
pattem
of
FK
model stud-
ied
in
[13-16].
The
implem
巳
ntation
of
control laws to ma-
nipulate
mode
of
motion has become a central issue in non-
linear dynamics
[1, 13]. Such a
probl
巳
m
may arise when
studying different physical systems such as tribology
, heat
conduction
and
so
on
[17-21].
Different feedback control
laws have been designed in hope
of
yielding desired mode
of
average behavio
r.
The
feedback control algorithm
COJ
卜
sidered in
[1
7] is based
on
the
conc
巳
pt
of
a terminal attrac-
tor. This non-Lipschitzian control law makes it possible to
achieve finite-time convergence. However
, when the com-
manded
velocity is
c1
0se to the average velocity
of
the cen-
ter
of
mass
of
the parti
c1
es in an uncontrolled system, this
controllaw
may
fail. References
[14-
16] designed a contin-
uous
controllaw
using direct Lyapunov method.
The
disad-
vantage
of
this continuous control law is that it can manip-
ulat
巳
the
velocity to only a vicinity
of
the desired value. To
overcome this disadvantage
, a switching control is also pro-
posed
in
[1
4
一
16].
In contrast, switching control can cause
chattering along the switching surface. To the best
of
our
Received
13
August
2012;
revised
21
Dec
巳
mber2012.
中
Corresponding
author.
E-mail:
tang.wenyan8@gmai
l.
com
knowledg
巳,
non
巳
of
these studies allows for a control law
manipulating average behavior to converge to desired mode
pr
巳
cisely.
A continuous nonlinear control law to conquer
this drawback is designed. Another focus
of
this paper is
the synchronization problem for a special case
of
this
c1
ass
syst
巳
ms
is considered, which attracts much
att
巳
ntion
du
巳
to
its importance.
How
巳ver
,
only local conditions on this phe-
nomenon are given in previous research
[14
一
16].
This paper
tries to develop global conditions on i
t.
The
arrangement
of
this paper is as follows: In the next section, modeling the
chain
of
N
interconn
巳
cted
parti
c1
es is presented and control
problem is
formulat
巳
d.
In Section 3, a continuous nonlin-
ear
controllaw
is designed to solve the
formulat
巳
d
problem
using direct Lyapunov method. In Section 4
, a synchroniza-
tion problem for a
sp
巳
cial
case
of
this
c1
ass nonlinear dy-
namical systems is concemed. Finally
, simulations results
are given in Section
5 to show the validity and efficiency
of
the
d
巳
signed
controllaw
and synchronization result derived
in this paper.
Through the paper
,
]R
n denotes n-dimensional
Eu
c1
idean
spac
巳,
and
]R
nxm
is the set
of
all n x m real
mat
由
es.
11
.
11
refers to
Eu
c1
idean vector norm
or
the induced matrix 2-
norm.
2 System description
and
control problem
formulation
The
FK
model describing interconnected parti
c1
es is
giv
巳
n
by the equations
N-l
θ
[L
W(Xi
+1
一句)
1
z
二
1
Xi
十
γ
Xi
十
Sln
Xi=
内
十认(1)
aXi
wherexτ(i
= 1, . • . ,
N)
is the
coordinat
巳
of
the
ith
parti
c1
e,
γis
the positive friction coefficient
representing
出巳
single
p
哑
ti
c1
e
energy
exchang
巳
with
出
e
subs
阳旬
,
W(Xi
+1 -
Xi)
is the potential
of
the interaction between two
n巳
arest
parti-
@
South
China
University
of
Technology
and
Academy
of
Mathematics
and
Syst巳
ms
Science
,
CAS
and
Springer-Ve
rI
ag
Berlin
Heidelberg
2013