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Fault-distribution-dependent reliable control for time-varying delay system

控制理论与应用（英文版） 2011年第4期9卷 589-593页

作者： Zhou GU Jinliang LIU Lilong DU Engang TIAN School of Power Engineering Nanjing Normal University Nanjing Jiangsu 210042 China College of Information Science and Technology Donghua University Shanghai 201620 China Department of Automation North China Electric Power University Beijing 102206 China Institute of Information and Control Engineering Nanjing Normal University Nanjing Jiangsu 210042 China

This paper considers the problem of reliable control for continuous-time systems with interval time-varying delay. By introducing a random matrix, a new practical actuator fault model is established. Using the Lyapunov-Krasovskii approach, a sufficient condition for the existence of reliable controller is expressed by a linear matrix inequality（LMI）. An illustrative example is exploited to show the effectiveness, of the proposed design procedures.

关键词： Reliable control Stochastic actuator fault model Time-delay

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Knowledge-based Artificial Fish-Swarm algorithm

Knowledge-based Artificial Fish-Swarm algorithm

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作者： Wu, Ying Gao, Xiao-Zhi Zenger, Kai Control Theory and Engineering Department Harbin Institute of Technology Harbin 150001 China Department of Automation and Systems Technology Aalto University School of Electrical Engineering Espoo P.O.BOX 15500 FI-00076 Aalto Finland

ISBN: (纸本)9783902661937

In this paper, a knowledge-based Artificial Fish-Swarm (AFA) optimization algorithm with crossover, CAFAC, is proposed to enhance the optimization efficiency and combat the blindness of the search of the AFA. In our CAFAC, the crossover operator is first explored. The knowledge in the Culture Algorithm (CA) is next utilized to guide the evolution of the AFA. Both the normative knowledge and situational knowledge is used to direct the step size as well as direction of the evolution in the AFA. Ten high-dimensional and multi-peak functions are employed to investigate this new algorithm. Numerical simulation results demonstrate that it can indeed outperform the original AFA. © 2011 IFAC.

关键词： Knowledge based systems

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Output tracking of Markovian jumping systems via error feedback regulation

Output tracking of Markovian jumping systems via error feedb...

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作者： He, Shuping Ding, Zhengtao Liu, Fei Institute of Automation Jiangnan University Wuxi 214122 China Control Systems Centre School of Electrical and Electronic Engineering University of Manchester Manchester M60 1QD United Kingdom

ISBN: (纸本)9783902661937

This paper studies the output tracking problem of continuous-time Markovian jumping systems (MJSs) via error feedback scheme. With the extension of output regulation to MJSs, sufficient conditions are obtained based on stochastic Lyapunov-Krasovskii functional. The resulting closed-loop system is guaranteed to be stochastically stable and the output tracking is achieved almost asymptotically. Moreover, the output regulation error almost asymptotically converges to zero. In order to ensure the relaxed solutions of the regulation equations, we described the problem as a semi-definite optimization approach via disciplined convex programming. Simulation result is also given to illustrate the performance and effectiveness of the proposed approach. © 2011 IFAC.

关键词： Convex optimization

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Simulation and optimized layout analysis of hydraulic power system in aircraft

Simulation and optimized layout analysis of hydraulic power ...

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2011 International Conference on Fluid Power and Mechatronics, FPM 2011

作者： Li, Xin Wang, Shaoping Zhao, Pan Liang, Ran School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beijing 100191 China Robotics Institute Beihang University Beijing 100191 China

ISBN: (纸本)9781424484522

Aiming at the problems of vibration on hydraulic pipe in aircraft, using math modeling and simulation is a quite efficient and effective method in theory. In this paper, the 14-equation Fluid-Structure Interaction (FSI) with influence of viscous friction is established for modeling the pipe and fluid. By using the Transfer Matrix Method (TMM), the components and pipelines are connected to get the simulation results of resonance frequency points and dynamic impedance of system. Our simulation demonstrates that most of the flow fluctuation between the natural frequencies of pump is absorbed by bumper;the vibration of high-frequency is damped if the filter is set in front of the pipeline system, and the vibration-absorbing effect of hose is better than pipe or hose-pipe-hose followed the pump. © 2011 IEEE.

关键词： Transfer matrix method

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Robustness of prediction based delay compensation for nonlinear systems

Robustness of prediction based delay compensation for nonlin...

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作者： Findeisen, Rolf Grüne, Lars Pannek, Jürgen Varutti, Paolo Otto-von-Guericke-Universität Magdeburg Institute for Automation Engineering Department of Systems Theory and Automatic Control Germany University of Bayreuth Institute of Mathematics Department of Applied Math. Germany Curtin University of Technology Perth Australia

ISBN: (纸本)9783902661937

control of systems where the information between the controller, actuator, and sensor can be lost or delayed can be challenging with respect to stability and performance. One way to overcome the resulting problems is the use of prediction based compensation schemes. Instead of a single input, a sequence of (predicted) future controls is submitted and implemented at the actuator. If suitable, so-called prediction consistent compensation and control schemes, such as certain predictive control approaches, are used, stability of the closed loop in the presence of delays and packet losses can be guaranteed. In this paper, we show that control schemes employing prediction based delay compensation approaches do posses inherent robustness properties. Specifically, if the nominal closed loop system without delay compensation is ISS with respect to perturbation and measurement errors, then the closed loop system employing prediction based delay compensation techniques is robustly stable. We analyze the influence of the prediction horizon on the robustness gains and illustrate the results in simulation. © 2011 IFAC.

关键词： Closed loop systems

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Model-Aided controller Evaluation for a Surgical Assistance Robot to Track Patient Movements in Real Time

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IFAC Proceedings Volumes 2011年第1期44卷 10313-10318页

作者： H.-C. Schneider J. Wahrburg H. Roth Center for Sensorsystems University of Siegen Germany Head of Control Engineering Department Institute of Automation Technology University of Siegen Germany

Abstract This contribution describes the model-aided development and evaluation of a surgical robot motion controller that has been performed in order to improve the robot's dynamic behavior during optically navigated real time surgical instrument tracking. The navigation of the robot is realized using a camera-based optical 3D localizing system for visual servoing feedback. In this paper, we present a model-based controller that improves the dynamics of surgical instrument tracking, under the consumption of the limited measurement rate of common optical localizer systems and the use of a velocity-driven robot arm.

关键词： Robot arms Robot control Robot dynamics Robot navigation Robot vision Servomotor actuators State-space methods Model-based control Feedforward control Medical applications

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Image recognition technology in intelligent cotton harvesting machine

Image recognition technology in intelligent cotton harvestin...

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2011 International Conference on Information Technology, Computer engineering and Management Sciences, ICM 2011

作者： Wang, Mulan Li, Xiaoxia Liu, Kun Jiang, Rong Jiangsu Key Laboratory of Advanced Numerical Control Technology Nanjing Institute of Technology Nanjing 211167 China School of Mechanical Engineering Changzhou University Changzhou 213016 China School of Automation Nanjing Institute of Technology Nanjing 211167 China School of Mechanical Engineering Nanjing Institute of Technology Nanjing 211167 China

ISBN: (纸本)9780769545226

In view of the functional demands of the electrical control system for the intelligent cotton harvesting machine, the machine vision technology is employed. A cotton recognition method is proposed based on Hough transform. When the cottons gather together or overlap, the image data are partially lost or incomplete. To precisely identify the hidden cotton in the natural environment, firstly the image is segmented by R-B channel in RGB color model to reduce the computational complexity. Then the minimum external rectangle is obtained by labeling its region. Finally, contour information is acquired through the boundary trace approach in the effective region and the randomized Hough transform (RHT) method is realized according to the mathematic model of cotton contour. Results show that the recognition method is feasible when the amount of cotton contour information is lost less than 50%, which can meet the accuracy and speed requirements of target recognition for the intelligent cotton harvesting machine. © 2011 IEEE.

关键词： Cotton

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步进炉汽化冷却系统模糊给水控制

步进炉汽化冷却系统模糊给水控制

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华东六省一市自动化学会2012学术年会

作者： LU Zhaoquan 鲁照权 WANG Hongmei 汪红梅 DONG Xueping 董学平 ZHANG Xiaojiang 张晓江 ZOU Yangju 邹扬举 REN Caiheng 任才横 HE Juan 何娟 Optimal Control Research Institute School of Electrical Engineering and AutomationHefei University 合肥工业大学电气与自动化工程学院优化控制技术研究所安徽合肥230009

汽包是汽化冷却系统中的核心设备，其液位是保证加热炉安全生产的关键。由于汽化冷却系统具有非最小相位、非自衡、不确定、时滞、负荷扰动等特性，采用传统的PID往往控制效果不佳。在研究了系统特性的基础上，引入模糊推理，实现了模... 详细信息

汽包是汽化冷却系统中的核心设备，其液位是保证加热炉安全生产的关键。由于汽化冷却系统具有非最小相位、非自衡、不确定、时滞、负荷扰动等特性，采用传统的PID往往控制效果不佳。在研究了系统特性的基础上，引入模糊推理，实现了模糊自整定PID的三冲量汽包液位串级控制系统，使汽包液位在承受各冲量强烈干扰的情况下具有良好的稳定性。

关键词：步进式加热炉轧钢设备汽化冷却给水控制汽包液位

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The application and issuse of linear wireless sensor networks

The application and issuse of linear wireless sensor network...

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2011 International Conference on System Science, engineering Design and Manufacturing Informatization, ICSEM 2011

作者： Wang, Zhengjie Zhao, Xiaoguang Qian, Xu College of Information and Electrical Engineering Shandong University of Science and Technology Qingdao China State Key Laboratory of Intelligent Control and Management of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China Beijing China

ISBN: (纸本)9781457702471

Wireless sensor networks consist of a large number of sensor nodes that have low power and limited transmission range and can be used in various scenario. The nodes can be deployed in the long and narrow region, such as road, bridge, tunnel and pipeline, to get some interesting information. The linear topology of these network application is different other application and have special feature, such as multi-hop, long delay, long distance and low reliability. This paper introduces the concept of linear wireless sensor networks and discusses the classification of topology and key issue of this network. The application of the linear wireless sensor network, such as road, bridge, tunnel and pipeline is presented. The research challenges are discussed at last in this paper. © 2011 IEEE.

关键词： Topology

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Fast double-parallel image processing based on FPGA

Fast double-parallel image processing based on FPGA

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IEEE International Conference on Vehicular Electronics and Safety

作者： Li, Ye Yao, Qingming Tian, Bin Xu, Wencong State Key Lab. of Intelligent Control and Management of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing 100190 China School of Mechanical Electrical and Information Engineering Shandong University Weihai 264209 China

ISBN: (纸本)9781457705762

Due to FPGA's flexibility and parallelism, it is popular for accelerating image processing. In this paper, a double-parallel architecture based on FPGA has been exploited to speed up median filter and edge detection tasks, which are essential steps during image processing. The double-parallel scheme includes an image-level parallel and an operation-level parallel. The image-level parallel is a high-level parallel which divides one image into different parts and processes them concurrently. The operation-level parallel, which is embedded in each image-level parallel thread, fully explores every parallel part inside the concrete algorithms. The corresponding design is based on a DE2 Development Board which contains a CYCLONE II FPGA device. Meanwhile, the same task has also been implemented on PC and DSP for performance comparison. Despite the fact that operating frequencies of used PC and DSP are much higher than FPGA's, FPGA costs less time per computed image than both of them. By taking advantage of the double-parallel technique, the speed/frequency ratio of FPGA is 202 times faster than PC and 147 times faster than DSP. Finally, a detailed discussion about different platforms is conducted, which analyzes advantages and disadvantages of used computing platforms. This paper reveals that the proposed double-parallel scheme can dramatically speed up image processing methods even on a low-cost FPGA platform with low frequency and limited resources, which is very meaningful for practical applications. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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