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Stability of linear discrete switched systems with delays based on average dwell time method

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Science china(information Sciences) 2010年第6期53卷 1216-1223页

作者： WANG Yong 1 , WANG Wei 1 & LIU GuoPing 2,3 1 research center of information and control, dalian university of technology, dalian 116024, china 2 Faculty of Advanced technology, university of Glamorgan, Pontypridd, CF37 1DL, UK 3 CTGT center in Harbin Institute of technology, Harbin 150001, china 1. research center of information and control Dalian University of Technology Dalian 116024 China2. Faculty of Advanced Technology University of Glamorgan Pontypridd CF37 1DL UK3. CTGT Center in Harbin Institute of Technology Harbin 150001 China

This paper deals with the problem of exponential stability for a class of linear discrete switched systems with constant *** switched systems consist of stable and unstable *** on the average dwell time method, some switching signals will be found to guarantee exponential stability of these *** explicit state decay estimation is also given in the form of the solutions of linear matrix inequalities(LMIs).An example relating to networked control systems(NCSs) illustrates the effectiveness of the proposed method.

关键词： switched systems average dwell time time delay LMI

Guaranteed cost control for T-S fuzzy systems with time-varying delays

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控制理论与应用（英文版） 2010年第4期8卷 413-417页

作者： Qiang KANG,Wei WANG (research center of information and control,dalian university of technology,dalian Liaoning 116024,china) research center of information and control Dalian University of Technology Dalian Liaoning China

This paper deals with the problem of guaranteed cost control for nonlinear systems with time-varying delays which is represented by Takagi-Sugeno （T-S） fuzzy models with time-varying *** derivatives of time-varying delay are not necessary to be *** on the free weighting matrix method,sufficient conditions for the existence of fuzzy guaranteed cost controller via state feedback are given in terms of linear matrix inequalities （LMIs）.A minimizing method is also proposed to search the suboptimal upper bound of the guaranteed cost *** results are delay-dependent but contain delay-independent criteria as a special case.A numerical example is presented to demonstrate the effectiveness and less conservativeness of our work.

关键词： Delay systems Guaranteed cost control T-S fuzzy systems

control OF FORMABILITY OF EMC LIQUID METAL COLUMN

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中国有色金属学会会刊：英文版 1996年第2期6卷 117-122页

作者： Zhang Xingguo Jin Junze Cao Zhiqiang (research center of Foundry Engineering ,dalian university of technology, dalian 116024) dalian UNIV TECHNOL FOUNDRY ENGN RES CTRDALIAN 116024PEOPLES R CHINA

ＣＯＮＴＲＯＬＯＦＦＯＲＭＡＢＩＬＩＴＹＯＦＥＭＣＬＩＱＵＩＤＭＥＴＡＬＣＯＬＵＭＮＺｈａｎｇＸｉｎｇｇｕｏ；ＪｉｎＪｕｎｚｅ；ＣａｏＺｈｉｑｉａｎｇ（ＲｅｓｅａｒｃｈＣｅｎｔｅｒｏｆＦｏｕｎｄｒｙＥｎｇｉｎｅｅｒｉ... 详细信息

ＣＯＮＴＲＯＬＯＦＦＯＲＭＡＢＩＬＩＴＹＯＦＥＭＣＬＩＱＵＩＤＭＥＴＡＬＣＯＬＵＭＮＺｈａｎｇＸｉｎｇｇｕｏ；ＪｉｎＪｕｎｚｅ；ＣａｏＺｈｉｑｉａｎｇ（ＲｅｓｅａｒｃｈＣｅｎｔｅｒｏｆＦｏｕｎｄｒｙＥｎｇｉｎｅｅｒｉｎｇ，ＤａｌｉａｎＵｎｉｖｅｒｓｉ...

关键词： electro-magnetic casting liquid column height electro-magnetic forming

THE CHOICE OF KEY PARAMETERS OF EMC

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中国有色金属学会会刊：英文版 1995年第3期5卷 74-78页

作者： Zhang, Xingguo Jin, Junze Cao, Zhiqiang (Casting Engineering research center,dalian university of technology, dalian 116024) dalian Univ of technology China

ＴＨＥＣＨＯＩＣＥＯＦＫＥＹＰＡＲＡＭＥＴＥＲＳＯＦＥＭＣ￥Ｚｈａｎｇ，Ｘｉｎｇｇｕｏ；Ｊｉｎ，Ｊｕｎｚｅ；Ｃａｏ，Ｚｈｉｑｉａｎｇ（ＣａｓｔｉｎｇＥｎｇｉｎｅｅｒｉｎｇＲｅｓｅａｒｃｈＣｅｎｔｅｒ，ＤａｌｉａｎＵｎ... 详细信息

ＴＨＥＣＨＯＩＣＥＯＦＫＥＹＰＡＲＡＭＥＴＥＲＳＯＦＥＭＣ￥Ｚｈａｎｇ，Ｘｉｎｇｇｕｏ；Ｊｉｎ，Ｊｕｎｚｅ；Ｃａｏ，Ｚｈｉｑｉａｎｇ（ＣａｓｔｉｎｇＥｎｇｉｎｅｅｒｉｎｇＲｅｓｅａｒｃｈＣｅｎｔｅｒ，ＤａｌｉａｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌ...

关键词： electro-magnetic casting height of liquid metal column casting speed

Relation of chaos activity characteristics of the cardiac system with the evolution of species

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Chinese Science Bulletin 2002年第24期47卷 2042-2048页

作者： WANG XingyuanSchool of Electronic and information Engineering, dalian university of technology, dalian 116024, china dalian university of technology School of Electronic and Information Engineering Dalian China

According to the nonlinear theory, the experiments have been conducted on sample ECG (electrocardiogram) signals of healthy human beings, coronary heart disease patients and adult canines. On the basis of the analyses of the power spectra, the computation of the correlation dimension and the Lyapunov exponent to a large number of ECG signals, the following conclusions are shown: through the comparative research, (1) the analyses of the power spectra, the computation of the correlation dimension and the Lyapunov exponent to the ECG signals reflect the whole dynamic characteristics of the hearts, and they may become a new method of researching ECG quantitatively to an early diagnose of heart disease. (2) Under normal physiological conditions the cardiac activities are chaotic, while under pathologic conditions the cardiac activities approach regularity. (3) On the basis of the comparative research of human beings and canines, it is revealed that chaos may be a quantitative index to measure the evolution

关键词： chaos evolution of species ECG signals power spectra correlation dimension Lyapunov exponent.

Kalman filtering for time-delayed linear systems

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Science in china(Series F) 2006年第4期49卷 461-470页

作者： LU Xiao1,2 & WANG Wei1 1. research center of information and control, dalian university of technology, dalian 116024, china 2. Shenzhen Graduate School, Harbin Institute of technology, Shenzhen 518055, china 1. research center of information and control Dalian University of Technology Dalian 116024 China 2. Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055 China

This paper is to study the linear minimum variance estimation for discretetime systems. A simple approach to the problem is presented by developing re-organized innovation analysis for the systems with instantaneous and double time-delayed measurements. It is shown that the derived estimator involves solving three different standard Kalman filtering with the same dimension as the original system. The obtained results form the basis for solving some complicated problems such as H, fixed-lag smoothing, preview control, H, filtering and control with time delays.

关键词： discrete-time systems delayed measurements innovation analysis Riccati equations.

Multi-robot cooperative localization based on autonomous motion state estimation and laser data interaction

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Science china(information Sciences) 2010年第11期53卷 2240-2250页

作者： ZHUANG Yan, GU MingWei, WANG Wei & YU HaiYang research center of information and control, dalian university of technology, dalian 106024, china 1. research center of information and control Dalian University of Technology Dalian 106024 China

Multi-robot cooperative localization is an important research topic in mobile robotics. This paper mainly studies the problem of cooperative localization based on environment information interaction in unknown complex environment. Considering the effiect of robot motion state on the cooperative localization, we present an algorithm for adaptive selecting periods of the cooperative localization based on autonomous motion state estimation. In order to avoid equipping an extra localization marker on the robot which is needed for direct observation between robots, and to make full use of the interactive information between robots in the same scene, a method for obtaining multi-robot observations based on MbICP algorithm is proposed, which makes multirobot cooperative localization using EKF feasible and reliable in cluttered environment. Experiment results with the Pioneer 3-DX robots and data analysis show the method’s validity and practicability.

关键词： multi-robot cooperative localization motion state estimation metric-based iterative closest point extended Kalman filter

Large-Eddy Simulations of turbulent flows with lattice Boltzmann dynamics and dynamical system sub-grid models

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Science china(Technological Sciences) 2009年第3期52卷 670-679页

作者： GUAN Hui1 & WU ChuiJie2 1 research center for Fluid Dynamics, PLA university of Science and technology, Nanjing 211101, china 2 School of Aeronautics and Astronautics, dalian university of technology, dalian 116024, china research center for Fluid Dynamics PLA University of Science and Technology Nanjing 211101 China School of Aeronautics and Astronautics Dalian University of Technology Dalian 116024 China

In this paper, two sub-grid scale (SGS) models are introduced into the Lattice Boltzmann Method (LBM), i.e., the dynamics SGS model and the dynamical system SGS model, and applied to numerically solving three-dimensional high Re turbulent cavity flows. Results are compared with those obtained from the Smagorinsky model and direct numerical simulation for the same cases. It is shown that the method with LBM dynamics SGS model has advantages of fast computation speed, suitable to simulate high Re turbulent flows. In addition, it can capture detailed fine structures of turbulent flow fields. The method with LBM dynamical system SGS model dose not contain any adjustable parameters, and can be used in simulations of various complicated turbulent flows to obtain correct information of sub-grid flow field, such as the backscatter of energy transportation between large and small scales. A new average method of eliminating the inherent unphysical oscillation of LBM is also given in the paper.

关键词： Large-Eddy Simulation Lattice Boltzmann Method dynamics sub-grid scale model dynamical system sub-grid scale model parallel computation

The cut sets,decomposition theorems and representation theorems on intuitionistic fuzzy sets and interval valued fuzzy sets

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Science china(information Sciences) 2011年第1期54卷 91-110页

作者： YUAN XueHai,LI HongXing & SUN KaiBiao School of Electronic and information Engineering,dalian university of technology,dalian 116024,china 1. School of Electronic and information Engineering Dalian University of Technology Dalian 116024 China

In this paper,the cut sets,decomposition theorems and representation theorems of intuitionistic fuzzy sets and interval valued fuzzy sets are researched ***,new definitions of four kinds of cut sets on intuitionistic fuzzy sets are introduced,which are generalizations of cut sets on Zadeh fuzzy sets and have the same properties as that of Zadeh fuzzy ***,based on these new cut sets,the decomposition theorems and representation theorems on intuitionistic fuzzy sets are *** kind of cut sets corresponds to two kinds of decomposition theorems and representation *** eight kinds of decomposition theorems and representation theorems on intuitionistic fuzzy sets are obtained,*** last,new definitions of cut sets on interval valued fuzzy sets are given based on the theory of cut sets on intuitionistic fuzzy sets,and eight kinds of decomposition theorems and representation theorems on interval valued fuzzy sets are also obtained. These results provide a fundamental theory for the research of intuitionistic fuzzy sets and interval valued fuzzy sets.

关键词： intuitionistic fuzzy sets interval valued fuzzy sets triple valued fuzzy sets cut sets decomposition theorem representation theorem