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IEEE Conference on Decision and control

作者： G.K. Fourlas K.J. Kyriakopoulos N.J. Krikelis Department of Informatics and Computer Technology Technological Educational Institute (TEI) of Lamia Lamia Greece Control Systems Laboratory Mechanical Engineering Department National and Technical University of Athens Athens Greece

ISBN: (纸本)0780386825

Fault detection and isolation is a challenging task in the control of large scale complex systems. In this work we proceed to the fault diagnosis of an electric power transmission system based on a fault diagnosis of hybrid systems method presented in our previous work. Power systems often exhibit complex behavior in response to large disturbances. Such behavior is characterized by interactions between continuous dynamics and discrete events. Components such as loads drive the continuous dynamics, while other components such as protection devices exhibit event-driven discrete dynamics. Therefore, power systems constitute an important case of hybrid systems for fault detection.

关键词： Power transmission Power system dynamics Hybrid power systems Power system protection Electrical fault detection Fault diagnosis Power system faults control systems Large-scale systems Drives

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SELF-POWERED WIRELESS TEMPERATURE SENSING USING MEMS-BASED AA-SIZE ENERGY TRANSDUCER

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International Journal of Information Acquisition 2004年第2期1卷 121-128页

作者： JOHNNY M. H. LEE STEVE C. L. YUEN MIMI H. M. LUK GORDON M. H. CHAN KING FONG LEI WEN J. LI PHILIP H. W. LEONG YEUNG YAM Centre for Micro and Nano Systems The Chinese University of Hong Kong Hong Kong SAR China Department of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong SAR China Intelligent Control Systems Laboratory The Chinese University of Hong Kong Hong Kong SAR China

This paper presents the design and experimental results of a Micro Power Generator (MPG) which harvests mechanical energy from its environment and converts this energy into useful electrical power. The energy transduction component is mainly a magnet and a resonating spring made using SU-8 molding and MEMS electroplating technologies. We have shown that when the MPG is packaged into an AA battery size container along with a power-management circuit that consists of rectifiers and a capacitor, it is capable of producing ~1.6 V DC when charged for less than 1 min. Our goal is to realize a MPG to function with low input mechanical frequencies while producing enough power for low-power wireless applications.

关键词： Micro power generator micro energy transducer high-aspect-ratio MEMS SU-8 processing

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Low order sampled data H/sub /spl infin// control using the delta operator and LMIs

Low order sampled data H/sub /spl infin// control using the ...

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IEEE Conference on Decision and control

作者： B. Lennartson R. Middleton A.-K. Christiansson T. McKelvey Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden Complex Dynamic Systems & Control School of Electrical Engineering & Computer Science University of Newcastle Callaghan NSW Australia University of Trollhättan/Uddevalla Trollhattan Sweden Department of Signals and Systems Chalmers University of Technology Goteborg Sweden

A procedure for H/sub /spl infin// optimization of low order controllers for discrete-time and sampled-data systems is presented in this paper. Generally, low order H/sub /spl infin// controllers may be achieved by solving bilinear matrix inequalities (BMIs). In this paper an iterative alternation between two LMIs gives a suboptimal solution. To avoid local minima in this search the initial controller is obtained by a frequency weighted controller reduction scheme, where the closed loop properties of a full order controller is taken into account. A minimal number of parameters in the state space realization of the controller also reduces the complexity and improves numerical robustness. The complete presentation is based on delta operator models, which shows a close relationship between the continuous- and discrete-time solutions. The sensitivity of the ordinary discrete-time shift operator LMI formulation to small sampling periods is also analyzed.

关键词： control systems Linear matrix inequalities Sampling methods Automatic control Frequency Weight control Robust control Signal processing State-space methods Robustness

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Robustness of dual-rate inferential MPC systems

Robustness of dual-rate inferential MPC systems

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American control Conference (ACC)

作者： J.A. Rossiter J. Sheng T. Chen S.L. Shah Department of Automatic Control & Systems Engineering Sheffield University Sheffield UK Coordinated Science Laboratory University of Illinois Urbana USA Department of Electrical & Computer Engineering University of Alberta Edmonton AB Canada Department of Chemical & Materials Engineering University of Alberta Edmonton AB Canada

This paper investigates the robustness of dual-rate MPC systems with a proposed inferential control strategy. It shows that for some scenarios where a high-frequency model plant mismatch is presented, such dual-rate i... 详细信息

关键词： Robustness Robust stability Predictive models Robust control control systems Predictive control Strontium control system analysis Integrated circuit modeling Time varying systems

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Petri net-based design of modular supervisors for remotely human control systems

Petri net-based design of modular supervisors for remotely h...

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SICE Annual Conference

作者： Jin-Shyan Lee Meng-Chu Zhou Pau-Lo Hsu Department of Electrical & Control Engineering National Chiao Tung University Hsinchu Taiwan Department of Electrical & Computer Engineering New Jersey Institute of Technology Newark NJ USA Laboratory of Complex Systems & Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing China

ISBN: (纸本)4907764227

In an Internet-based control system, particular human operations may violate desired requirements and lead to destructive failure. For such human-in-the-loop systems, this paper extends the remote supervisory scheme by Lee and Hsu (2003) to a modular one so as to reduce the supervisor synthesis complexity. Also, remote human issued commands are guaranteed to meet required specifications. A rapid thermal process in semiconductor manufacturing systems is provided to show the practicability of the proposed approach.

关键词： Humans control systems Supervisory control Automatic control Internet control system synthesis Rapid thermal processing Error correction control engineering Intelligent systems

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Experimental evaluation of a new repetitive control algorithm on a non-minimum phase spring-mass-damper system

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IFAC Proceedings Volumes 2004年第12期37卷 681-686页

作者： C.T. Freeman J.J. Hätönen P.L. Lewin D.H. Owens E. Rogers School of Electronics and Computer Science University of Southampton University Road Southampton SO17 1BJ United Kingdom Fax: +44(0)2380 593709 Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Systems Engineering Laboratory The University of Oulu P.O. BOX 4300 FIN-90014 University of Oulu Finland

Recently, a novel optimality based Repetitive control algorithm was proposed in (Hätönen et al. , 2003). According to the convergence analysis carried out in that paper, the algorithm will result in asymptotic convergence for an arbitrary discrete-time LTI plant and a T -periodic reference. However, the performance of the algorithm was tested only using simulation studies. In order to rigorously test how the algorithm performs with real systems, in this paper the algorithm is implemented on a non-minimum phase spring-mass-damper system. The results are very satisfactory, because the algorithm results in near perfect tracking with this rather demanding plant type.

关键词： Repetitive control Optimal control Polynomial systems Theory Non-Minimum Phase systems

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AA size micro power conversion cell for wireless applications

AA size micro power conversion cell for wireless application...

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World Congress on Intelligent control and Automation (WCICA)

作者： S.C.L. Yuen J.M.H. Lee M.H.M. Luk G.M.H. Chan Kin Fong Lei P.H.W. Leong W.J. Li Yeung Yam Custom Computer Laboratory The Chinese University of Hong Kong Hong Kong SAR Centre for Micro and Nano Systems The Chinese University of Hong Kong Hong Kong SAR Hong Kong China Intelligent Control Systems Laboratory The Chinese University of Hong Kong Hong Kong SAR Hong Kong China Dept of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong SAR Hong Kong China Centre for Micro and Nano Systems The Chinese University of Hong Kong Hong Kong SAR

This paper presents the preliminary design and experimental results of a standard AA size vibration-induced micro energy transducer which is integrated with a power-management circuit. The transducer is a spring mass system which uses SU-8 molding and MEMS electroplating technologies fabricated copper springs to convert mechanical energy into electrical power by Faraday's law of induction. We have shown that when the MPG is packaged into an AA battery size container along with a power-management circuit that consists of rectifiers and a capacitor, it is capable of producing /spl sim/1.6 V DC when charged for less than 1 min. Potential applications for this micro power generator to serve as a power supply for a wireless temperature sensing system was proved to be possible with input frequencies at about 100 Hz and amplitudes be approximately 250 microns.

关键词： Power conversion Transducers Springs Vibrations Micromechanical devices Integrated circuit technology Copper Mechanical energy Packaging Batteries

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Practical implementation of a model inverse optimal iterative learning controller

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IFAC Proceedings Volumes 2004年第12期37卷 687-692页

作者： J.D. Ratcliffe T.J. Harte J.J. Hätönen P.L. Lewin E. Rogers D.H. Owens School of Electronics and Computer Science University of Southampton University Road Southampton SO17 1BJ United Kingdom Fax: +44 (0)23 8059 3709 Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Systems Engineering Laboratory The University of Oulu P.O. BOX 4300 FIN-90014 University of Oulu Finland

In this paper, a new model inverse optimal iterative learning control algorithm is practically implemented on an industrial gantry robot. The algorithm has only one tuning parameter which can be adjusted to provide a balance between convergence speed and robustness. Results show that the algorithm is capable of learning the required trajectory in very few iterations. However at this convergence rate the lack of robustness is a major issue. Appropriate use of the tuning parameter is shown to greatly increase the algorithm robustness as demonstrated by tests which successfully reach 600 iterations.

关键词： Learning control Iterative methods Optimal control

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Optimizing the structure of hierarchical mixture of experts using genetic algorithms

Optimizing the structure of hierarchical mixture of experts ...

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International IEEE Conference on Intelligent systems, IS

作者： D.A. Karras C.E. Vlitakis Y.S. Boutalis B.G. Mertzios Chalkis Institute of Technology Department Automation and Hellenic Open University Athens Greece Department Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece Department of Automation Thessdoniki Institute of Technology Laboratory of Automatic Control Systems Thessaloniki Hellas and Democritus University Xanthi Greece

This study is an effort to give a practical solution in the problem of optimizing the structure of the hierarchical mixture of experts model, which is a natural extension of the associative Gaussian mixture of experts system. We present two novel methods for optimizing such structures using genetic algorithms. Special concern is taken for reducing the computational time so as to efficiently allow the structure to "grow" while it evolves with the genetic algorithm. The main contribution of the paper lies on the efficient, topologically oriented, representations of such architectures so as to be optimized through involving genetic algorithms.

关键词： Genetic algorithms Biological cells Optimization methods Neural networks Classification tree analysis Automation Decision trees Expert systems computer architecture Supervised learning

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Nano-scale mechanical test of MEMS structures by atomic force microscope

Nano-scale mechanical test of MEMS structures by atomic forc...

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World Congress on Intelligent control and Automation (WCICA)

作者： L.M. Fok C.K.M. Fung Y.H. Liu W.J. Li Robot Control Laboratory The Chinese University of Hong Kong Hong Kong Hong Kong China Centre for Micro and Nano Systems The Chinese University of Hong Kong Hong Kong Hong Kong China Dept. of Automation and Computer-Aided Engineering The Chinese University of Hong Kong Hong Kong China Centre for Micro and Nano Systems The Chinese University of Hong Kong Hong Kong

This paper focuses on the nano-scale analysis of the mechanical properties of polymer and carbon nanotubes (CNT) embedded MEMS devices using the probe tip of the atomic force microscope (AFM).The mechanical properties of the surfaces of layered materials were investigated by using nanoindentation produced with the tips of an AFM. Experiment results indicated the bending characteristics of the device and also the Young's modulus of the CNT embedded micro structure. Our objective was to determine the nano-scale mechanical properties and piezoresistivity of bulk carbon nanotubes using the local probe manipulation.

关键词： Atomic force microscopy Testing Micromechanical devices Mechanical factors Atomic layer deposition Nanoscale devices Carbon nanotubes Probes Polymers Microelectromechanical devices

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