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第二十九届中国控制会议

作者： WEN Kai,GENG Zhiyong key laboratory for turbulence and complex systems,department of mechanics and aerospace engineering,peking university,beijing 100871,P.R.china

This paper studies the problem of stability for a class of networked control systems with the aperiodic transmission delays and the quantization *** the assumptions that the system works under the Try-Once-Discard（TOD）protocol and the transmission delays are bounded,the entire system is modeled as a discrete system interconnected with a 2×2 block uncertainty,which is the typical structure in the robust control *** the approaches in robust control,three less conservative and easy to use results are derived by employing the small gain theorem,the Integral Quadratic Constraint（IQC）method and the μ tool,***,an illustrative example is presented to show the usefulness and effectiveness of the results.

关键词： Networked Control systems Aperiodic Delay Quantization Error Robust Control

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Stabilization of a Class of Uncertain Chaotic systems via Robust Adaptive Sliding-mode Control

Stabilization of a Class of Uncertain Chaotic Systems via Ro...

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第二十九届中国控制会议

作者： YANG Liang,YANG Jianying The state key Lab for turbulence and complex systems and department of mechanics and aerospace engineering,College of engineering,peking university,beijing 100871,P.R.china

This paper considers the stabilization of a class of uncertain chaotic systems.A robust adaptive sliding-mode controller is proposed to suppress the chaotic systems with uncertain systematic parameter vectors and unknown bound on external *** obtained systems have the desired sliding-mode dynamics,which prescribes the asymptotic stability and robustness against *** adaption laws,designed for identification of unknown parameters,are convergent with the Lyapunov stability *** numerical simulation of Genesio-Tesi system and Lorenz system verifies the effectiveness of this proposed control scheme.

关键词： Chaotic systems Sliding-mode Control Adaption Law Lyapunov Stability

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Robust dichotomy for nonlinear uncertain systems

Robust dichotomy for nonlinear uncertain systems

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第25届中国控制会议

作者： Wang Jinzhi, Duan Zhisheng, Huang Lin The state key laboratory for turbulence and complex systems and department of mechanics and engineering Science, peking university, beijing 100871

＜正＞In this paper, properties of dichotomy for nonlinear systems with norm-bounded uncertainty are considered. By using some results of H∞, theory and method of linear matrix inequality （LMI） some criterions of testing robust dichotomy of uncertain nonlinear systems are given. A approach of designing state feedback controller guaranteeing dichotomy of closed loop systems with norm-bounded uncertainty is proposed. The given results are applied to Chua’s circuit. A numerical algorithm of designing a controller guaranteeing dichotomy of the closed-loop system is presented which enlarges the range of some parameters.

关键词： Uncertain nonlinear systems Robust dichotomy H∞ norm Linear matrix inequality.

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Fault Diagnosis and Construction of a Class of Nonlinear systems with Unmodeled Dynamics

Fault Diagnosis and Construction of a Class of Nonlinear Sys...

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第三十届中国控制会议

作者： LI Linlin,YANG Ying state key Lab for turbulence and complex systems,department of mechanics and aerospace engineering,College of engineering,peking university,beijing 100871,P.R.china

＜正＞This paper presents a fault detection and construction scheme for a class of Lipschitz nonlinear systems with unmodeled dynamics and disturbance.A sliding mode observer is developed,and the design results are formulated in Linear Matrix Inequalities（LMIs）.The fault considered here can be unbounded as long as its qth derivative is *** the classical fault construction method based on the property of sliding surface,the fault alarm rate is reduced by minimizing the unmodeled dynamics and disturbance effects on the construction *** example is given to illustrate the effectiveness of this fault construction approach.

关键词： Fault construction Unmodeled dynamics Sliding mode observer

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Special Decentralized Control Problems in Discrete-time Interconnected systems Composed of Two Subsystems

Special Decentralized Control Problems in Discrete-time Inte...

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第25届中国控制会议

作者： Duan Zhisheng, Wang Jinzhi, Huang Lin state key laboratory for turbulence and complex systems and department of mechanics and engineering Science peking university, beijing 100871

＜正＞In this paper, some special decentralized control problems are addressed for discrete-time interconnected systems. First it is pointed out that some subsystems must be unstable to ensure stability of the overall system in some special cases. Then a special kind of decentralized control problem is studied. This kind of problem can be viewed as harmonic control among independent subsystems. Research results show that two unstable systems can generate a stable system through some effective cooperations. In addition, linear matrix inequality based based decentralized controller design method is also given by using parameter-dependent Lyapunov function method developed for the study of robust stability. Two examples are given to illustrate the results.

关键词： Interconnected systems Decentralized control Parameter-dependent Lyapunov function (PDLF) Linear matrix inequality (LMI)

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Optimization design study of low-Reynolds-number high-lift airfoils for the high-efficiency propeller of low-dynamic vehicles in stratosphere

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Science china(Technological Sciences) 2010年第10期53卷 2792-2807页

作者： MA Rong1, ZHONG BoWen2 & LIU PeiQing1 1 key laboratory of Fluid mechanics, Ministry of Education, Institute of Fluid mechanics, School of Aeronautical Science and engineering, beijing university of Aeronautics and Astronautics, beijing 100191, china 2 department of aerospace Science, School of engineering, Cranfield university, MK43 0AL, United Kingdom 1. key laboratory of Fluid mechanics Ministry of Education Institute of Fluid Mechanics School of Aeronautical Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 China2. Department of Aerospace Science School of Engineering Cranfield University MK43 0AL Cranfield UK

Aerodynamic performance of low-Reynolds-number high-lift airfoil makes a great impact on designing a high-efficiency propeller for low-dynamic vehicles in stratosphere. At high altitude,low-Reynolds-number airfoils are supposed to have high lift-drag ratio or high endurance factor at cruising attack angle along with good stall characteristics. To design such a high-performance low-Reynolds-number high-lift airfoil,the paper established a hierarchical multi-objective optimization platform by combing direct search optimization algorithm EXTREM and airfoil flow field solver XFOIL to automatically and quickly calculate aerodynamic performance function of airfoil by computer. It provides an effective solution to multi-point design problem of low-speed low-Reynolds-number airfoil. It can be seen from the results of three typical optimization examples,the new airfoil E387_OPT2,FX63-137_OPT2 and S1223_OPT2 based on hot low-Reynolds-number high-lift airfoils (Eppler 387 airfoil,Wortmann FX63-137 airfoil and S1223 airfoil) can meet the optimization design requirements and have very good aerodynamic characteristics in both design state and non-design state. Thus,the applicability and effectiveness of hierarchical multi-objective optimization platform are verified.

关键词： multi-objective optimization low Reynolds number airfoil EXTREM hierarchical multi-objective optimization

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Generalized Hierarchical Structures and Rearranging Analysis of Statistical Property of Sequence of Daily Sunspots

Generalized Hierarchical Structures and Rearranging Analysis...

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中国力学学会学术大会'2009

作者： Xie Yu,Zhang Mingjie,Su Weidong Stake key laboratory for turbulence and complex systems and department of mechanics and aerospace engineering,College of engineering, peking university,beijing 100871,china

The problems of sunspots have always been attractive to scientists,because they have quite important relationship to our daily *** we can manage the rules of sunspots,then we can predict the behavior of sun in short or long periods,which can serve for researching or preventing *** this article,based on the theory of hierarchical structures which is widely used in observing the scaling prop-

关键词： hierarchicalstructures sunspots EMD method randomwalking

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Cost Analysis with Input Extension in Time Optimal Control

Cost Analysis with Input Extension in Time Optimal Control

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第二十九届中国控制会议

作者： PENG Zhongxing,YANG Ying,HUANG Lin state key laboratory for turbulence and complex systems,department of mechanics and aerospace engineering,College of engineering,peking university,beijing 100871,P.R.china

Due to the popularity of the input redundant systems,this paper focused on the problem of input extension which concerns about the effect of adding new input redundancy into a controllable *** to the time optimal control problem,such effect is evaluated by the optimal *** on the assumption of the existence and uniqueness of the optimal control,this paper proves that the more input redundancy a system possesses the less time is needed to drive it from a same initial state to the origin point if at least one redundant input channel is not an idle ***,the normality of the extended optimal control problem will guarantee that all of the input redundant channels will be used to short the optimal ***,two numerical examples are deployed to demonstrate the main results in this paper.

关键词： Input extension Idle channel Time optimal control Redundant systems

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Synchronization of Lur’e Networks with Time Delay

Synchronization of Lur’e Networks with Time Delay

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第二十六届中国控制会议

作者： Xu Shiyun,Yang Ying,Huang Lin state key Lab for turbulence and complex systems,department of mechanics and aerospace engineering,College of engineering,peking university,beijing 100871,P.R.china

In this paper,we present a network model in which every identical node is a time-delay Lur’e system,and we investigate the synchronization problem of such *** is shown that the synchronization condition is determined by the dynamics of each uncoupled node by using a decoupling technique,which reduces a high-dimension linear matrix inequality to the test of a set of LMIs with dimensions of the same as that of each *** derived criteria are very easy to be verified through Matlab *** efficiency of the derived results is demonstrated by a numerical example through simulation.

关键词： Lur’e System Time-delay complex Network Synchronization

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Cycle Slipping in Discrete Phase-controlled System

Cycle Slipping in Discrete Phase-controlled System

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第25届中国控制会议

作者： Lu Pingli,Yang Ying,Huang Lin state key Lab for turbulence and complex systems, department of mechanics and engineering Science, peking university,beijing 100871

This paper considers cycle slipping of discrete phase-controlled system with periodic nonlinearity. The number of slipped cycles is an important characteristic of such nonlinear system. Based on Yakubovich-Kalman Lemma which establishes the equivalence between frequency domain inequalities(FDIs) and linear matrix inequalities ( LMIs) , the conditions of estimating the number of slipped cycles are derived. Then dynamic output feedback controller is designed to guarantee the nonexistence of cycle slipping. As a result,the transient performance of discrete phase-controlled system is improved. A concrete application to impulse phase-locked loop (PLL) shows the applicability and validity of the proposed approach.

关键词： Cycle Slipping Phase-controlled System Yakubovich-Kalman Lemma LMIs

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