Design of controller for Lur’e systems guaranteeing dichotomy
Ao Dun
a,
⇑
, Zhiyong Geng
b
, Lin Huang
b
a
College of Electronics Information and Control Engineering, Beijing University of Technology, Beijing 100124, PR China
b
Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Aerospace Technology, College of Engineering,
Peking University, Beijing 100871, PR China
article info
Keywords:
Lur’e system
Dichotomy
KYP (Kalman–Yakubovich–Popov) lemma
LMI (linear matrix inequality)
Dynamic feedback controller
abstract
In this paper, the problem of controller design for Lur’e systems guaranteeing dichotomy is
investigated. On the basis of Kalman–Yakubovich–Popov (KYP) lemma and two frequency
equalities, a new methodology for the dichotomy analysis of the Lur’e systems is proposed.
A linear matrix inequality (LMI) based criterion is derived, which is equivalent to the Leo-
nov’s frequency-domain one, while for the dichotomy analysis and synthesis which is more
straightforward than the frequency-domain one. In virtue of this result, a dynamic output
feedback controller ensuring the dichotomy property for Lur’e systems is designed. Finally
a numerical example is included to demonstrate the validity and the applicability of the
proposed approach.
Crown Copyright Ó 2011 Published by Elsevier Inc. All rights reserved.
1. Introduction
Many complex nonlinear dynamic systems which are often encountered in practice can be multistable. In many cases,
multistability may change the performance and spoil the reliability of the system. So for a multistable system, the controller
is often designed such that the closed loop system is monostable, or dichotomous [1]. In fact, dichotomy is one of the most
important properties of nonlinear dynamic systems which describes the global dynamic behaviors of the system in the state
space. For a dichotomous system, the solutions of the system are either unbounded or convergent to a certain equilibrium.
Therefore, the solutions such as limit cycles and chaos attractors, which may exist in electronic circuits, lasers, geophysical
models, mechanical and biological systems [2–4], will be excluded in the dichotomous systems. So dichotomy analysis and
synthesis are practically important and theoretically appealing. The frequency-domain dependent inequality condition that
guarantees the property of dichotomy for the Lur’e systems was obtained by Leonov and Gelig [5]. However, the frequency
domain condition often leads to heavy numerical procedures due to the requirement of frequency sweeping [6]. Moreover, it
is hard to extend existing frequency domain results to robust analysis and synthesis of systems with parametric or dynamic
uncertainties.
In recent years, there has been an increasing interest in the development of the dichotomy property for dynamic systems
[7–12]. For time-varying systems, when the exponential stability assumption is relaxed to that of exponential dichotomy, the
stability and detectability conditions are removed in [7]. For Lur’e systems, the development of the dichotomy property con-
tains several aspects. By applying KYP lemma and some results of positive real control, the method of controller design based
on LMI for a class of nominal pendulum-like systems, which is one of the important types of Lur’e systems, to guarantee
dichotomy is proposed [8]. Considering the roles played by interconnections, the property of dichotomy is investigated by
changing the parameters of the interconnections in the obtained LMI conditions [9]. Based on the frequency domain
dichotomy condition, some parameter domains are determined for the nonexistence of chaotic attractors or limit cycles in
0096-3003/$ - see front matter Crown Copyright Ó 2011 Published by Elsevier Inc. All rights reserved.
doi:10.1016/j.amc.2011.03.094
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Corresponding author.
E-mail address: aodun@bjut.edu.cn (A. Dun).
Applied Mathematics and Computation 217 (2011) 8927–8935
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Applied Mathematics and Computation
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