Mathematical Problems in Engineering

Volume 2013 (2013), Article ID 202969, 8 pages

http://dx.doi.org/10.1155/2013/202969

## Dissipativity Analysis and Synthesis for a Class of Nonlinear Stochastic Impulsive Systems

^{1}School of Hydropower & Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China^{2}Hubei Province Key Lab of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430081, China

Received 1 August 2013; Accepted 6 September 2013

Academic Editor: Tao Li

Copyright © 2013 Guici Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

#### Abstract

The dissipativity analysis and control problems for a class of nonlinear stochastic impulsive systems (NSISs) are studied. The systems are subject to the nonlinear disturbance, stochastic disturbance, and impulsive effects, which often exist in a wide variety of industrial processes and the sources of instability. Our aim is to analyse the dissipativity and to design the state-feedback controller and impulsive controller based on the dissipativity such that the nonlinear stochastic impulsive systems are stochastic stable and strictly -dissipative. The sufficient conditions are obtained in terms of linear matrix inequality (LMI), and a numerical example with simulation is given to show the correctness of the derived results and the effectiveness of the proposed method.

#### 1. Introduction

As we all know that many real-world systems may be disturbed by stochastic factors. Thus, stochastic differential systems appear as a natural description of many observed phenomena of real world. In the past few years, much research effort has paid to the stability analysis and robust control problems for stochastic systems which have been come to play an important role in many fields including population dynamics, macroeconomics, chemical reactor control, communication network, image processes, and mobile robot localization. So far, plenty of significant results also have been published; see, for example, [1–8] and the references therein.

Recent years, there are many real-world systems and natural processes which display some kind of dynamic behavior in a style of both continuous and discrete characteristics; we called “impulsive effects,” which exist widely in many evolution process, particularly some biological system such as biological neural networks and bursting rhythm models in pathology as well as optimal control models in economics, frequency-modulated signal processing system, fly object motions, and so on [9, 10]. Impulsive dynamical systems are characterized by the occurrence of abrupt changes in the state of the system occurring at certain time instants. The stability and control problems of impulsive dynamical systems have attracted considerable interest in science and engineering during the past decades including stability analysis of stochastic impulsive systems or with time delay [11–14], robust control of impulsive systems with time delay [15, 16], and robust control and filtering of stochastic impulsive systems with time delay [17].

On the other hand, since the notation of dissipative dynamical system was introduced by Willems [18], dissipative systems have been of particular interest to researchers in areas of systems, circuits, networks, control, and so forth. Now, dissipative theory has wide-ranging implications and applications in control theory. For instance, dissipativeness was crucially used in the stability analysis of nonlinear system [19], and the theory of dissipative systems generalizes basic tools including the passivity theory, bounded real lemma, Kalman Yakubovich lemma, and the circle criterion [20]. Among the relevant topics are the passivity analysis and synthesis for time-delay systems [21, 22]. These results show that the passivity-based methods are highly effective in designing the robust controller.

The stability and stabilization [11–13, 19, 23], controllability [14], robust control [15, 16, 20, 22], robust filtering [17], and reliable dissipative control [24] problems have been extensively studied. However, the dissipative analysis and synthesis for nonlinear stochastic impulsive system have not been fully discussed and remains challenging. In this paper, we mainly study the dissipativity analysis and control problems for a class of nonlinear stochastic impulsive systems (NSISs). The systems are subject to the nonlinear disturbance, stochastic disturbance, and impulsive effects, which often exist in a wide variety of industrial processes and the sources of instability. Here, our aim is to analysis the dissipativity and to design the state-feedback controller and impulsive controller based on the dissipativity such that the nonlinear stochastic impulsive systems are stochastic stable and strictly -dissipative.

*Notations*. Throughout this paper, if not explicitly stated, matrices are assumed to have compatible dimensions. For symmetric matrices and , the notation (resp., ) means that the matrix is positive semidefinite (resp., positive definite). is a identity matrix with appropriate dimensions; the subscript “” represents the transposition. denotes the expectation operator with respect to some probability measure . is the space of square integrable vector functions over ; let be a complete probability space which relates to an increasing family of algebras , where is the samples space, is algebra of subsets of the sample space, and is the probability measure on . and denote the dimensional Euclidean space and the set of all real matrices, respectively. For any , we write for the closure of the open interval in and denote by the space of the nonanticipative stochastic processes with respect to satisfying . and describe the minimum and maximum eigenvalue, respectively.

#### 2. A Class of Nonlinear Stochastic Impulsive Systems

In this paper, we mainly consider the following nonlinear stochastic impulsive systems (NSISs): where is the system state, is the control input, is the exogenous disturbance input of the systems which belong to , is the system control output, and is a zero mean real scalar Weiner processes on a probability space relative to an increase family of algebras . , , , and are the known real constant matrices with appropriate dimensions. Moreover, we assume that

The sequence, and in the systems describe the impulsive effect and impulsive control, respectively, where , are known real-valued matrices with appropriate dimensions, which have the effect of suddenly changing the state of the system at the point . , where , with discontinuity instants , ; for convenience, let and be sufficiently small. Without loss of generality, it is assumed that .

is an unknown nonlinear function which describes the system nonlinearity satisfying the following condition: for a positive constant . Equivalently stated, condition (3) implies that there exists a scalar such that also is an unknown nonlinear function which describes the stochastic nonlinearity satisfying where is a known real constant matrices with approximate dimension.

#### 3. Preliminaries

In this section, some definitions and lemmas are given.

*Definition 1. *For systems in (1) with , if there exists a constant satisfying , , systems in (1) are said to be stochastically stable.

Before giving the following definition, we firstly give the definition of quadratic energy supply function associated with systems in (1) as follows: where , , and are real matrices with appropriate dimensions and and are symmetrical.

*Definition 2. * Systems in (1) are called -dissipative if for any , under zero initial state, the following condition is satisfied:
Furthermore, if for a scalar , such that
systems in (1) are called strictly -dissipative.

Lemma 3 (Schur complement lemma (see [25])). * For a given matrix with , , then the following conditions are equivalent:**(1)**,**(2)**, ,**(3)**, .*

Lemma 4 (see [26]). *For any , if is a positive definite matrix, is a symmetric matrix, then
*

In this paper, our aim is to develop dissipativity criteria for systems in (1) based on Definition 2 and subsequently design the feedback dissipative controller .

#### 4. Main Results and Proofs

##### 4.1. Dissipativity Analysis of NSISs

For dissipativity analysis for NSISs, we treat the free systems as follows:

Theorem 5. *Given a real matrix , the positive matrices , and a negative semidefinite matrix , if there exist a scalar and a positive definite matrix , such that the following inequalities hold:
**
where . Then the NSISs in (10) are stochastic stable and strictly -dissipative.*

*Proof. *Construct a simple Lyapunov function as follows:
For , , according to the Itô formula, along with the solution of systems in (10), we have
Applying (3)–(5), we get that
where

So
where
By Lemma 3, if (17) holds, then (11) holds. Since , there exists a sufficient small such that . Together with (11), we have

In the following section, we firstly consider the stability of NSISs in (10). Setting , by (11) and Lemma 4, we have
which leads to
where .

Applying Dynkin formula and Grownwall-Bellman inequality, together with (21), for , , we have

By Lemma 4 and (10), it follows that
For , it follows from (22) and (23) that
which leads to
Hence, for , it follows from (22)–(25) that

We know that

In summary, we obtain that
where ; let , and we have

Therefore, we get

Then, there exists a constant , such that

Hence, the NSISs in (10) are stochastic stable.

Secondly, we consider the -dissipativity of NSISs in (10). When , setting , from (11) and (12), we have

So it follows that (8) holds; thus the NSISs in (10) are strictly -dissipative according to Definition 2. The proof is complete.

*Remark 6. *From (12), we see that is not a LMI; it is difficult to obtain the feasible solution, so by schur complement lemma, which is implied by a matrix inequality,

##### 4.2. State-Feedback Dissipative Control of NSISs

We are now ready to design the state-feedback controller for the closed-loop NSISs in (1), and the NSISs in (1) can be rewritten as Then, we have the following results.

Theorem 7. *Given a real matrix , a positive definite matrices and a negative semidefinite matrix , if there exist a scalar , and three matrices , , and , such that the following linear matrices inequalities (LMIs)
**
have a feasible solution, then the NSISs in (34) are stochastic stable and strictly -dissipative, the feedback gain is , and the impulsive controller gain is , where , , .*

*Proof. *For NSISs in (34), applying Theorem 5 and Lemma 3, we have
where .

Applying the congruent transformation and , to (37) and (33), respectively, introducing the linearization , and using , , LMIs (35) and (36) hold. The proof is complete.

*Remark 8. *When , , and , strictly -dissipative reduces to the performance level. When , , and , strictly -dissipative reduces to the strictly passivity.

*Remark 9. *If , then let , which means that there is no need for any impulsive controller for NSIS (1). If , then choose appropriate such that , which means that there is need of impulsive controller with gain for NSISs in (1).

Corollary 10. *If there exist a scalar and three matrices , , and , such that the inequalities
**
and (36) have a feasible solution, then the NSISs in (34) are stochastic stable with performance level, and the feedback gain is .*

Corollary 11. *If there exist a scalar and three matrices , , and , such that the inequalities
**
and (36) have a feasible solution, then the NSISs (34) are stochastic strictly passive, and the feedback gain is .*

#### 5. Numerical Example with Simulation

In this section, we will give an example to show the correctness of the derived results and the effectiveness of the proposed methods. Considering NSISs in (1), the system parameters are given as follows:

From Figure 1, we can see that the uncontrolled NSISs in (1) are not stable; from (3)–(5), we can easily calculate that , , and we choose . Applying Theorem 7 to this example with , then we have

So the controller parameters can be calculated as follows: The state curves and the output curves of closed-loop NSISs in (1) can be seen in Figures 2 and 3.

From Figure 4, we can see that the closed-loop NSISs in (1) are strictly -dissipative, and Figure 5 shows the variation of in , for all .

#### 6. Conclusions

In this paper, the dissipativity analysis and control problems for a class of nonlinear stochastic impulsive systems (NSISs) have been investigated. The systems are subject to the nonlinear disturbance, stochastic disturbance, and impulsive effects, which often exist in a wide variety of industrial processes and the sources of instability. Based on the dissipativity, the state-feedback controller and impulsive controller, such that the nonlinear stochastic impulsive systems are stochastic stable and strictly -dissipative, have been designed. The sufficient conditions have been obtained in terms of linear matrix inequalities (LMIs), and the given numerical example with simulation shows the correctness of the derived results and the effectiveness of the proposed method.

#### Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

#### Acknowledgments

This work is supported by National Science Foundation of China (NSFC) under Grant nos. 61104127, 51079057, and 61134012, China Postdoctoral Science Foundation with Grant no. 2012M521428, and Hubei Province Key Laboratory of Systems Science in Metallurgical Process (Wuhan University of Science and Technology) under Grant no. Y201101.

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