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$H_{\bm \infty}$ Fuzzy control for Systems With Repeated Scalar Nonlinearities and Random Packet Losses

IEEE Transactions on Fuzzy Systems 2009年第2期17卷 440-450页

作者： Hongli Dong Zidong Wang Huijun Gao College of Electrical and Information Engineering Daqing Petroleum Institute Daqing China Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin China Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK

This paper is concerned with the H infin fuzzy control problem for a class of systems with repeated scalar nonlinearities and random packet losses. A modified Takagi-Sugeno (T-S) fuzzy model is proposed in which the consequent parts are composed of a set of discrete-time state equations containing a repeated scalar nonlinearity. Such a model can describe some well-known nonlinear systems such as recurrent neural networks. The measurement transmission between the plant and controller is assumed to be imperfect and a stochastic variable satisfying the Bernoulli random binary distribution is utilized to represent the phenomenon of random packet losses. Attention is focused on the analysis and design of H infin fuzzy controllers with the same repeated scalar nonlinearities such that the closed-loop T-S fuzzy control system is stochastically stable and preserves a guaranteed H infin performance. Sufficient conditions are obtained for the existence of admissible controllers, and the cone complementarity linearization procedure is employed to cast the controller design problem into a sequential minimization one subject to linear matrix inequalities, which can be readily solved by using standard numerical software. Two examples are given to illustrate the effectiveness of the proposed design method.

关键词： Fuzzy control Takagi-Sugeno model Fuzzy sets Nonlinear equations Nonlinear systems Recurrent neural networks Loss measurement Stochastic processes Propagation losses Performance analysis

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Connectivity preserving distributed coordination control with few long range interactions

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information technology Journal 2009年第7期8卷 1059-1064页

作者： Wang, Dong-Mei Fang, Hua Jing Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China College of Information Science and Engineering Wuhan University of Science and Technology 947 Heping Road Wuhan 430081 China

Distributed coordination control of multi-agent systems raises fundamental and novel problems in recent years. A great new challenge is the development of robust distributed motion algorithms. In this study, a distributed control strategy for connectivity preserving coordinated motion of multi-agent system is presented by introduction small-world connections among mainly local interactions, For arbitrary initial network topology, the group consists of several connected subgroups. Some agents are modeled as virtual leader and steer the disconnected subgroup to flock together. In this way, flocking problem can be solved under more relaxed conditions, which need no the connectedness of the dynamic topology all the time, even the connectedness of the initial graph. Further, we show that the strategy is robust against connection failures between followers and leader in the leader following coordination control. Simulation results are given to validate the method. © 2009 Asian Network for Scientific information.

关键词： Multi agent systems

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The Application of RBF-NN with Improvements in Clustering Algorithm Based on Ant Colony Optimization in PID control

The Application of RBF-NN with Improvements in Clustering Al...

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International Symposium on Computational Intelligence and Design, ISCID

作者： Hua Zhang Feng Kong Xiuwei Fu Dongdong Zhang Department of Electronic Information and Control Engineering Guangxi University of Technology Liuzhou Guangxi China School of Computer and Control Guilin University of Electronic Science and Technology Guilin Guangxi China

The PID control of RBF-NN is taken for the nonlinear system. Due to the low quality of clustering in the clustering algorithm of the traditional RBF-NN, the rate of convergence is directly influenced by the initial value. In this paper, the quality of the clustering has been raised and the initial value has been optimized through the improvements of the clustering algorithm by taking the K-means-algorithm and the Ant Colony Optimization (ACO). The simulation results show that the rate of convergence is precise and fast after the clustering algorithm is improved and the PID control is better than the one without taking the new method.

关键词： Clustering algorithms Ant colony optimization Three-term control control systems Nonlinear control systems Convergence Intelligent control Computational intelligence Algorithm design and analysis Application software

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Face-Based Access control and Invigilation Tool for E-learning Systems

Face-Based Access Control and Invigilation Tool for E-learni...

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International Conference on Biometrics and Kansei engineering, ICBAKE

作者： C.M. Althaff Irfan Syusaku Nomura Karim Ouzzane Yoshimi Fukumura Department of Information Science and Control Engineering Nagaoka University of Technology Nagaoka Japan London Metropolitan University London UK

Knowledge is a key factor to the personal success. Further, the certifications are the instant tools that are commonly available to assess the personal success. In an e-Learning environment, where the learning projects are delivered with the aim to provide a professional or an academic certification, it is integral that the Learning Management Systems provide security features that will ensure the credibility of the assessment and the certification. In a conventional examination environment, there will be invigilators to overlook the candidates, on the contrary, in an on-line examination environment; it is a mandatory requirement that an invigilation mechanism is implemented to ensure the integrity of the examination. In this paper, we present a face recognition based invigilation tool for online e-Learning systems.

关键词： Access control Electronic learning Face recognition Face detection Computer vision Certification Pixel Biometrics Robust control Security

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Implementation of Haar Transform with PDDA Architecture for Flexible Scales

Implementation of Haar Transform with PDDA Architecture for ...

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International Conference on Intelligent Computation technology and Automation, ICICTA

作者： Zhu Bo Shi Rong Wan Qun National Information Control Laboratory Chengdu China Electrical Engineering Department University of Electronic Science and Technology Chengdu China

ISBN: (纸本)9781424447411

In this paper, a novel approach to the flexible scales of Haar wavelet transform in FPGAs is proposed, which could be achieved by only a single parallel dynamic distributed arithmetic (PDDA) FIR architecture with some pipelining registers. In addition, floating-point system is adopted to provide higher resolution over a large dynamic range. Furthermore, the scheme is mapped into a Xilinx Virtex5 FPGA chip. The synthesis results demonstrate it performs faster and consumes less resource under the same precision compared with conventional methods.

关键词： Finite impulse response filter Field programmable gate arrays Lattices Discrete wavelet transforms Wavelet transforms Pipeline processing Arithmetic Filter bank Parallel processing Digital signal processing

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The SDQ-based message estimator for motion NCS

The SDQ-based message estimator for motion NCS

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Asian control Conference

作者： Chen-Chou Hsieh Pau-Lo Hsu Bor-Chyun Wang Department of Electrical and Control Engineering National Chiao Tung University Hsinchu Taiwan Department of Computer Science and Information Engineering China University of Technology Hsinchu Taiwan

ISBN: (纸本)9781424454402

The limitation of network bandwidth leads to data dropout of communication which degrades performance of NCS. For motion control system implemented with NCS, the missing interpolation messages will cause motion error and it can be compensated by applying the message estimator. However, the distribution of the missing data will be more relevant to motion accuracy in NCS even with the same dropout rate. This paper proposes a novel performance index, the short-window dropout quantities (SDQ) which is an estimation of both the data dropout rate and the messing message distribution, for the motion NCS. Furthermore, based on the estimation of SDQ. the intelligent motion message estimator (IMM) is proposed in this paper to effectively compensate for data dropout effect. Finally, simulation results of a multi-axis motion NCS indicate that the present IMM significantly improves motion contouring accuracy compared with the 1-delay estimator or the Taylor estimator.

关键词： Motion estimation Motion analysis Motion control Performance analysis Bandwidth Delay effects Motion measurement Switches Spline Degradation

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Efficient Algorithms for the Kinematics and Path Planning of Manipulator

Efficient Algorithms for the Kinematics and Path Planning of...

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International Conference on Artificial Intelligence and Computational Intelligence (AICI)

作者： Dequan Guo Hui Ju Yuqin Yao Feng Ling Tianxiang Li Department of Control Engineering Chengdu University of Information and Technology Chengdu Sichuan China Department of Machinery Engineering Neijiang Vocational and Technical College Neijiang Sichuan China

The two basic problems of the automatic control of robotic manipulators are the kinematics and the path planning, which are the fundamental for computer controlled robots. The article presented fast and efficient algorithms for the inverse kinematics and path planning of manipulator consisting of six revolute joints. Through the control, we cause the end-effector of the manipulator to the maximum possible nearby of the expecting position and orientation with some small deviations in the permissible scope. In the solving, the problem of inverse kinematics was reduced to a system of algebraic equations. In the paper, we used a series of algebraic and numeric transformations to reduce the difficult problem to compute the values of the matrix. The resulting algorithm computed all the solutions of manipulators with six revolute joints. In the path planning, we made the end-effector of the manipulator smoothly in the initial and final position and a larger speed in the middle process using the improved method combined of fourth-order cubic and B-spline curve. The above mentioned approaches have been applied in our hand-eye coordinate system.

关键词： Path planning Robotics and automation Manipulators Automatic control Skeleton Robot kinematics Intelligent robots Animation Robotic assembly Robustness

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The Research of Weigh-in-Motion Sensor Layout Based on Data Fusion

The Research of Weigh-in-Motion Sensor Layout Based on Data ...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Zhu Wang Qi Wang Jiatong Hou School of Information Science and Engineering Harbin Institute of Technology Weihai China Department of automation of Testing and Control Harbin Institute of Technology Harbin China

Weigh-in-motion (WIM) is a better way that can gain the true weight of vehicle which is moving on the highway at a high speed. In this paper, the principle of piezoelectric sensor is introduced, and the WIM signal model is simplified. The application of data fusion approach is used on the basis of piezoelectric sensors, and the proper redistribution of sensors is used to gain the WIM model, then the expected value which is closer to the true axle load can be gained by the Gass-Newton method. The simulation of the different speed errors when the initial phases are different according to a layout shows that the accuracy is adequate.

关键词： Sensor fusion Axles Vehicle dynamics Sensor phenomena and characterization Road vehicles Noise level Frequency Low-frequency noise Sensor systems System testing

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Multi-face modeling for rapid prototyping of discrete event control systems

Multi-face modeling for rapid prototyping of discrete event ...

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European control Conference (ECC)

作者： Gábor Kovács Laurent Piétrac Department of Control Engineering and Information Technology Budapest University of Technology and Economics Budapest Hungary Laboratoire Ampère INSA de Lyon France

This paper reports a methodology for the multi-face modeling of discrete-event systems to be used in a framework for the rapid prototyping of supervisory controllers. However Supervisory control Theory provides a possibility for the synthesis of supervisors proven to respect the specifications, it uses ordinary finite state machines and operations resulting in state explosion, so therefore hardly applicable for large-scale systems. The aim of the presented methodology is to simplify and accelerate controller design procedure by model reduction. By the introduction of task philosophy and component-based design, a methodology for obtaining moderate-size functional models from technological representations is presented. The paper gives definitions for models serving as different representations of components and for the conversion between them.

关键词： Unified modeling language Libraries Safety Security Automata control systems Discrete-event systems

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The StoLPan view of the NFC ecosystem

The StoLPan view of the NFC ecosystem

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Wireless Telecommunications Symposium, WTS

作者： Balazs Benyo Andras Vilmos Gergely Fordos Balint Sodor Levente Kovacs Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary SafePay Systems Limited Hungary

NFC is one of the latest wireless communication technologies, making possible variety of business opportunities. StoLPaN, a pan-European consortium of companies, universities and user groups aims to define open commercial and technical frameworks for the remote management of NFC-enabled services on mobile devices. These frameworks will facilitate the deployment of NFC-enabled mobile applications regardless of the phone type and the nature of the services required. This paper describes the latest results of StoLPan consortium, the technical and business challenges of the NFC service development, interesting findings about the current issues of the NFC market, and a summary about the StoLPan application framework containing NFC technological details. Application opportunities of NFC services in the retail environment are also introduced.

关键词： Ecosystems Educational institutions control engineering information technology Environmental economics Smart cards Mobile communication ISO standards Telecommunication standards Consumer electronics

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