1 INTRODUCTION
Time delays can impose difficulties and restrictions on the
design of a controller. So in these control problems,
taking the delays into account is particularly important for
performance evaluation and control system’s design.
Since 1960s, the delay control problem has attracted
much attention due to its both practical and theoretical
importance. Various approaches have been developed and
a great number of results for continuous systems as well
as discrete systems have been reported in the literature;
see, for instance
[1,2]
.These years some researchers found
many practical systems can be modeled by delay
differential equations of neutral type
[3]
.This kind of
system contain delays both in its state, and in its
derivatives of state. Such systems are often Encountered
in networks of interconnected systems, lossless
transmission lines, partial element equivalent circuits in
electrical engineering, controlled constrained
manipulators in mechanical engineering
[4]
and in certain
implementation schemes of predictive controllers
[5]
. Very
recently, interest has been focused on the study of the
theory of normal neutral delay systems and some issues.
The problems of stability analysis and control of neutral
systems have been investigated and many results on these
topics have been obtained
[6-8]
. Mahmoud
[9]
, Xu
[10]
eg.
studied
∞
control problem for neutral system. And Li
[11]
eg. studied robust control for these systems. Since the 70s,
the control problem of passivity theory has attracted
much attention du
e to its both practical and theoretical
importance. Therefore, about passive control for
neutral system, there is very little literatures .Li
Cai-na
[12]
and Hu heli
[13]
researched the passive
control of uncertain linear neutral systems. So far
output strictly passive control and input strictly passive
control of neutral systems have not found.This
motivates the present study.
In this paper, we are concerned with the problem of
output strictly passive control and input strictly passive
control for neutral systems. Attention is focused on the
design of a state feedback controller, such that the
resulting closed-loop system satisfied the
prescribed
passive performance level. Finally, we give numerical
examples to demonstrate our proposed criteria.
Notation: Throughout this note, for symmetric matrices
X and Y , the notation XY≥ (respectively, XY> )
means that the matrix
XY− is positive semi-definite
(respectively, positive definite).
is the identity matrix
with appropriate dimension. The superscript “
T ” and
“
* ” represent the transpose and the complex conjugate
transpose.
x is the Euclidean norm of the vector x .
Matrices, if not explicitly stated, are assumed to have
compatible dimensions.
Output Strictly Passive and Input Strictly Passive of Neutral Systems
Jichun Wang
1,2
, Qingling Zhang
1
, Dong Xiao
1
, Jingjing Bao
1
, Huiying Zhang
1
1
School of Information Science and Engineering, Northeast University, Shenyang, China
2
School of Information Science and Engineering, Liaoning Industry University . China
wangjichunxd@yahoo.com.cn
Abstract: This paper concerns the problem of output strictly passive control and input strictly passive control for neutral systems. The
aims at designing state feedback controllers so that the neutral systems are asymptotical and output or input strictly passive. In terms
of a linear matrix inequality (LMI) and Lyapunov function, the strictly passive criteria is formulated. And the desired passive
controller is given. Finally, a numerical example is given to demonstrate the effectiveness of the proposed approach.
Keywords: output strictly passive; input strictly passive; neutral system;
1696
978-1-4799-3708-0/14/$31.00
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2014 IEEE