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Robust integral sliding mode control for uncertain systems with multiple time delays

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控制理论与应用（英文版） 2010年第2期8卷 211-214页

作者： Xiaoyu ZHANG, Xiangna LI (department of Electronic and information engineering, North china institute of Science and technology, Beijing 101601, china) department of Electronic and information engineering North China Institute of Science and Technology Beijing China

This paper proposes a robust integral sliding mode (RISM) manifold and the corresponding stabilization control law for uncertain systems with multiple time-varying time delays based on the techniques of linear matrix inequalities (LMI). The sufficient condition for the existence of the RISM manifold is given in terms of LMI, and then, the sliding mode control (SMC) law that can keep the system state on the RISM manifold from the initial time moment is developed. The efficiency and feasibility of the results are illustrated by a numerical example.

关键词： Robust control Integral sliding mode Time-delay systems LMI

Sufficient and necessary conditions for Lyapunov stability of Lorenz system and their application

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Science china(information Sciences) 2010年第8期53卷 1574-1583页

作者： LUO Qi 1 , LIAO XiaoXin 2 & ZENG ZhiGang 2 1 College of information and control, Nanjing University of information Science and technology, Nanjing 210044, china 2 department of control Science and engineering, Huazhong University of Science and technology, Image Processing and Intelligent control Key Laboratory of Education Ministry of china, Wuhan 430074, china College of information and control Nanjing University of Information Science and Technology Nanjing China department of control Science and engineering Huazhong University of Science and Technology Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Wuhan China

The sufficient and necessary conditions for Lyapunov stability of the zero equilibrium point of Lorenz system are discussed, and some brief criteria are presented for globally exponential stability, globally asymptotical stability and instability. Furthermore, the behavior of the non-zero equilibrium point of Lorenz system is also investigated, and several sufficient and necessary conditions are provided for locally exponential stability and instability. The established theorems in this paper develop and extend the existing achievements on Lyapunov stability of Lorenz system. In conclusion, by applying the obtained results, some less conservative feedback-control laws are derived to guarantee the globally exponential stability of the chaos control of Chen system, Lu¨ system, Yang-Chen system and Yu-Xia Li system.

关键词： Lorenz system Lyapunov stability sufficient and necessary condition bifurcation values globally exponential synchronization

A new geometric approach to blind source separation of bounded sources

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Progress in Natural Science:Materials International 2009年第7期19卷 891-896页

作者： Jinlong Zhang a, Guoxu Zhoua, Zuyuan Yang a, Xiaoxin Liao b a School of Electrics & information engineering, South china University of technology, Guangzhou 510641, china b department of control Science and engineering, Huazhong University of Science and technology, Wuhan 430074, china School of Electrics & information engineering South China University of Technology Guangzhou 510641 China department of control Science and engineering Huazhong University of Science and Technology Wuhan 430074 China

Based on the minimum-range approach, a new geometric approach is proposed to deal with blind source separation in this paper. The new approach is the batch mode of the original minimum-range approach. Compared with the original approach, the optimization algorithm of the proposed approach needs no parameters and is more efficient and reliable. In addition, the extension of minimum-rangebased approaches is discussed. The simulations show the efficiency of the proposed approach.

关键词： Blind source separation Independent component analysis Minimum-range approach

Estimating the mixing matrix by using less sparsity

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Progress in Natural Science:Materials International 2009年第8期19卷 1027-1031页

作者： Guoxu Zhou a, Zuyuan Yang a, Xiaoxin Liao b, Jinlong Zhanga a School of Electrics & information engineering, South china University of technology, Guangzhou 510641, china b department of control Science and engineering, Huazhong University of Science and technology, Wuhan 430074, china School of Electrics & information engineering South China University of Technology Guangzhou 510641 China department of control Science and engineering Huazhong University of Science and Technology Wuhan 430074 China

In this paper, the nonlinear projection and column masking (NPCM) algorithm is proposed to estimate the mixing matrix for blind source separation. It preserves the samples which are close to the interested direction while suppressing the rest. Compared with the existing approaches, NPCM works efficiently even if the sources are less sparse (i.e., they are not strictly sparse). Finally, we show that NPCM provides considerably accurate estimation of the mixing matrix by simulations.

关键词： Sparse component analysis Blind source separation Particle swarm optimization

A fast stereoscopic video coding algorithm based on JMVM

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Science china(information Sciences) 2011年第6期54卷 1218-1226页

作者： DENG ZhiPin 1,2 , JIA KeBin 1 , CHAN YuiLam 2 , FU ChangHong 2 & SIU WanChi 2 1 department of Electronic information & control engineering, Beijing University of technology, Beijing 100124, china 2 department of Electronic information engineering, Hong Kong Polytechnic University, Hong Kong, china department of Electronic information & control engineering Beijing University of Technology Beijing China department of Electronic information engineering Hong Kong Polytechnic University Hong Kong China

In order to exploit the intra-view and inter-view dependencies in stereo video coding, a fast joint motion and disparity estimation algorithm is proposed in this paper. An efficient search strategy based on the motion-disparity constraint is developed, in which both the motion and disparity vectors can be obtained simultaneously with low complexity. Moreover, a credible initial predictive vector set is designed with the aid of the temporal and spatial neighboring blocks so that the coding efficiency can be further enhanced. The experimental results demonstrate that the proposed algorithm can reduce more than 96% coding time compared with the JMVM full search with a negligible quality drop.

关键词： H.264 stereoscopic video coding disparity estimation motion estimation

COMPUTER VISION APPLIEDIN THE PRECISION control SYSTEM

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Chinese Journal of Mechanical engineering 2002年第1期15卷 87-89页

作者： Zhang Qingying Logistics engineering department，Wuhan University of technology，Wuhan 430063，china Logistics engineering Departiment Wuhan University of Technology Wuhan 430063

Computer vision and its application in the precision control system arediscussed. In the process of fabricating, the accuracy of the products should be controlledreasonably and completely. The precision should be kept and adjusted according to the information offeedback got from the measurement on-line or out-line in different procedures. Computer vision isone of the useful methods to do this. Computer vision and the image manipulation are presented, andbased on this, a n-dimensional vector to appraise on precision of machining is given.

关键词： Computer vision Measurement Precision Quality of products

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一类控制器摄动系统的H_∞强鲁棒控制

系统工程与电子技术 2004年第4期26卷 507-508,534页

作者：恒庆海北京信息工程学院信息与通信工程系北京100101

为了解决在被控对象和控制器同时摄动时控制系统的设计问题,提出了一般控制系统的强鲁棒性能概念。通过数学模型转换,将控制器的摄动转化为被控对象的摄动。给出了一类可采用H∞混合灵敏度求解强鲁棒控制器的一种设计方法。提高了在被... 详细信息

为了解决在被控对象和控制器同时摄动时控制系统的设计问题,提出了一般控制系统的强鲁棒性能概念。通过数学模型转换,将控制器的摄动转化为被控对象的摄动。给出了一类可采用H∞混合灵敏度求解强鲁棒控制器的一种设计方法。提高了在被控对象和控制器同时摄动时系统的性能。研究了不确定性权函数和性能权函数权函数的选取。考虑到SISO系统的特点,给出了求解强鲁棒PI控制器的简单算法,设计了强鲁棒控制的PI控制器参数。通过仿真示例验证了设计方法的有效性和可行性。

关键词：控制器摄动鲁棒控制强鲁棒性能

Multi-objective carrier chaotic evolutionary algorithm for DNA sequences design

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Progress in Natural Science:Materials International 2007年第12期17卷 1515-1520页

作者： Xiao Jianhua, Xu Jin, Geng Xiutang and Pan Linqiang(Key Laboratory of Image Processing and Intelligent control, department of control Science and engineering, Huazhong University of Science and technology, Wuhan 430074, china) Key Laboratory of Image Processing and Intelligent control Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

DNA computing is a new vista of computation, which is of biochemical type. Since each piece of information is encoded in biological sequences, their design is crucial for successful DNA computation. DNA sequence design is involved with a number of design criteria, which is difficult to be solved by the traditional optimization methods. In this paper, the multi-objective carrier chaotic evolution algorithm (MCCEA) is introduced to solve the DNA sequence design problem. By merging the chaotic search base on power function carrier, a set of good DNA sequences are generated. Furthermore, the simulation results show the efficiency of our method.

关键词： DNA computing carrier chaotic search multi-objective evolutionary algorithm DNA sequences design.

A RESEARCH TO HIGH-PERFORMANCE MULTI-LEVEL SINGLE-PHASE AC/DC POWER FACTOR CORRECT SWITCHING CONVERTER

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Journal of Electronics(china) 2008年第5期25卷 716-720页

作者： Gao Chao department of Electronic engineering Shenzhen Institute of Information Technology Shenzhen 518029 China

This letter studies and analyzes the working features of main circuit of tri-level boost Power Factor Correct(PFC) converter and the advantages of tri-level switch converter in aspects of bearing high-voltage of power components,overall system loss and magnetic component selection based upon the single-level boost PFC switch ***,relying on the application of mi-croprocessor in power converter technology and DSP(Digital Signal Processing) chip's strong cal-culating capacity,the letter presents the adoption of modified scheme of tri-level boost PFC converter under the control of predictive control ***,the operating principle and control method are specified,the results of circuit test and analysis are provided and the advantages of pre-dictive control technology-based multi-level boost PFC converter is verified.

关键词： Multi-level Power Factor Correct (PFC) Digital Signal Processing (DSP) Converter Predictive control Microprocessor