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MODEL REFERENCE PARAMETRIC ADAPTIVE ITERATIVE LEARNING control

IFAC Proceedings Volumes 2002年第1期35卷 469-474页

作者： H. Yu M. Deng T.C. Yang D.H. Owens School of Engineering and Computer Science Exeter University Exeter EX4 4QF School of Engineering and Information Technology Sussex University Brighton BN1 9QT Department of Automatic Control and Systems Sheffield University Sheffield S1 3JD

Most of iterative learning control (ILC) methods requires that the relative degree of the plant is less than 2 for a linear system or the plant is passive for a non-linear system. A new model reference parametric adaptive iterative learning control using the command generator tracker (CGT) theory is proposed in this paper. The method can be applied to control a plant with a higher relative degree and it only requires to iteratively adjust n m + 2 parameters for an SISO plant. Therefore, the ILC control system is very simple. The proposed method is in the spirit of simple adaptive control which has received intensive researches during past two decades. Simulation results show the effectiveness and usefulness of the proposed method.

关键词： Iterative learning control Adaptive control Strictly positive real Model reference control

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L/sub 2/ anti-windup via receding horizon optimal control

L/sub 2/ anti-windup via receding horizon optimal control

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American control Conference (ACC)

作者： A. Bemporad A.R. Teel L. Zaccarian Dipartimento di Ingegneria dellE28099 Informazione University of Sienna Siena Italy Automatic Control Laboratory ETH Zurich Switzerland Department of Electrical and Computer Engineering University of California Santa Barbara CA USA Dipartimento di Informatica Sistemi e Produzione Uniiversity of Rome Rome Italy

The nonlinear L/sub 2/ anti-windup framework introduced by Teel and Kapoor (1997) reduces the anti-windup synthesis problem to a state feedback synthesis problem for linear systems with input saturation and input matched L/sub 2/ disturbances. In this paper, such a state feedback is synthesized using receding horizon optimal control techniques, and its equivalent piecewise affine closed-form is computed using the techniques of Bemporad et al. (2002). The properties of the resulting anti-windup compensation scheme are analyzed in the paper, and its performance is investigated through a simulation example.

关键词： Optimal control Roentgenium control systems Predictive models Predictive control Industrial control Sampling methods Constraint optimization Performance analysis Costs

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IMPROVED FEEDBACK CONSOLIDATION ALGORITHM FOR MULTICAST ABR CONNECTIONS IN ATM NETWORKS 14

IMPROVED FEEDBACK CONSOLIDATION ALGORITHM FOR MULTICAST ABR ...

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14th International Conference on computer Applications in Industry and Engineering, CAINE 2001

作者： El-Sayed, Tamer M. El-Derini, Mohamed N. Selim, Mohamed S. Ahmed, Magdi A. Department of Computer Science and Automatic Control Faculty of Engineering University of Alexandria Egypt

ISBN: (纸本)9781618395344

A number of algorithms has been proposed for extending ABR congestion avoidance algorithms in ATM networks to perform feedback consolidation at the branch points of multicast connections. Schemes that attempt to maximize accuracy of feedback information tend to be slow in providing feedback to the source when the conditions in the network change. Accuracy can be traded for speed by having a switch generate feedback information before it has all the necessary information from downstream paths. This can cause consolidation noise, leading to a heavy rate at the source. In this paper, we propose improved algorithm for feedback consolidation, which combines benefits from the previous algorithms with reduced overhead. The performance of the proposed algorithm and a set of previously developed algorithms are compared under a variety of conditions. Results show that the proposed algorithm exhibits a fast transient response with accurate feedback and doesn't suffer from consolidation noise. © 2001 by the International Society for computers and Their Applications. All rights reserved.

关键词： Asynchronous transfer mode

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ODMQL: Object data mining query language

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International Symposium on Objects and Databases, 2000 held in conjunction with 14th European Conference on Object-Oriented Programming, ECOOP 2000

作者： Elfeky, Mohamed G. Saad, Amani A. Fouad, Souheir A. Computer Science and Automatic Control Department Alexandria University Egypt Department of Computer Sciences Purdue University United States

ISBN: (纸本)3540416641

Data mining is the discovery of knowledge and useful information from the large amounts of data stored in databases. The emerging data mining tools and systems lead to the demand of a powerful data mining query language. The concepts of such a language for relational databases are discussed before. With the increasing popularity of object-oriented databases, it is important to design a data mining query language for such databases. The main objective of this paper is to propose an Object Data Mining Query Language (ODMQL) for object-oriented databases as an extension to the Object Query Language (OQL) proposed by the Object Data Management Group (ODMG) as a standard query language for object-oriented databases. The proposed language is implemented as a feature of an experimental objectoriented database management system that is developed as a testbed for research issues of object-oriented databases. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Object-oriented databases

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Restructuring Object-Oriejnted Real-Time Distributed Software For Pipeline Environment 14

Restructuring Object-Oriejnted Real-Time Distributed Softwar...

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14th International Conference on Parallel and Distributed Computing Systems, PDCS 2001

作者： Fergany, Tahany A. Sarhan, Amany Computer Science Department University of New Haven West HavenCT06516 United States Department of Computer Science and Automatic Control Faculty of Engineering Tanta University Tanta Egypt

ISBN: (纸本)9781618395740

Distributed objects are increasingly becoming predominant with the widespread use of object-oriented technology. Coupled with object-oriented systems is the heterogeneity of computer systems that are interoperating together to form a large network such as the Internet. Within this distributed heterogeneous environment, objects are the main building blocks that form the communication of the distributed system. In real-time distributed environment, objects must deliver their services within given time constraints. In order to commit to performance constraints, a careful study and analysis of the software design is critical. Therefore, this research work focuses on restructuring distributed Object Oriented software to match the pipeline architecture. This technique provides the designer with a set of alternative solutions and the corresponding resource and communication cost while satisfying the system and computation constraints. The optimal solution that minimizes the system resources and the communication overheads will be also given. A search technique using genetic algorithm is used to scan the search space for the optimal software structure and the set of feasible ones. © (2001) by the International Society for computers and Their Applications All rights reserved.

关键词： Genetic algorithms

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A genetic algorithm for designing H/sub /spl infin// structured specified controllers

A genetic algorithm for designing H/sub /spl infin// structu...

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IEEE Conference on control Technology and Applications (CCTA)

作者： I. Kitsios T. Pimenides P. Groumpos Automatic Control Division Electrical and Computer Engineering Department University of Patras Greece

In conventional H/sub /spl infin// optimal output feedback control design, the order of the controller is higher than that of the plant. Thus it is not easy to implement H/sub /spl infin// optimal control in real world engineering problems. The paper tries to bridge the gap between the theoretical H/sub /spl infin// control and practical applications. It proposes a simple genetic algorithm (GA), blended with multi objective characteristics, for the design of a structure specified H/sub /spl infin// sub-optimal controller. Therefore, two examples involving a SISO phase-locked motor speed system with a lead/lag type controller and a MIMO super maneuverable F18/HARV fighter aircraft with a PI-type controller are given to illustrate the applicability of the design. Also in accordance with these examples a comparison study with an existing GA procedure, outlines the effectiveness of the proposed evolutionary scheme.

关键词： Genetic algorithms Algorithm design and analysis Optimal control control systems Output feedback control design Bridges MIMO Aircraft Aerospace control

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Software Package for Optimal Decisions in Large Scale Systems

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IFAC Proceedings Volumes 2001年第8期34卷 427-432页

作者： Dumitru Popescu Mihaela Serbanescu "Politehnica" University of Bucharest Department of Automatic Control and Computer Science 313 Splaiul Independentei 77206 Bucharest 6 ROMANIA

This paper presents the software package SISCON, dedicated to the evaluation of optimal decisions for large scale systems. SISCON firstly evaluates mathematical models developed out of experimental data using LS methods for linear and nonlinear systems and after that computes the optimal decision problems. The large scale systems have generally a complex structure and global approach computation cannot be carried out. The authors propose a descentralised decision structure having a well-defined distribution of supervisory functions. After decomposition of large - scale problems is carried out, subproblems are solved using standard optimization techniques. SISCON offers opportunities for solving non-linear mathematical programming problems and for evaluating optimal decisions in large scale systems control

关键词： large scale systems software optimisation (non) linear problems decomposition relaxation Partitioning

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Automated visual inspection to assembly of frontal airbag sensors of automobiles

Automated visual inspection to assembly of frontal airbag se...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： J. Fernandez D. Benchetrit D. Gachet Automatic Control and Computer Architecture Department Universidad Europea de Madrid Madrid Spain

ISBN: (纸本)0780372417

This paper describes an automatic quality control system that supervises through three CCD cameras the assembly of automobile airbag sensors. The main characteristics that can be detected are position, angle and geometric parameters of epoxy resin to fix the accelerator sensor. The system can inspect 12000 pieces/hour and now it is at full production in a multinational automobile component factory at Madrid.

关键词： Inspection Sensor phenomena and characterization Automobiles Quality control Charge coupled devices Charge-coupled image sensors Assembly systems Sensor systems Epoxy resins Production systems

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Robot navigation by visual local symmetry reflection axes

Robot navigation by visual local symmetry reflection axes

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： P. Mares A. Grau A.B. Martinez Department of Computer Engineering and Automatic Control (ESAII) Technical University of Catalonia Barcelona Spain

ISBN: (纸本)0780372417

A method for robot navigation is presented. It is based on the detection of the main local reflection symmetry axes in images where straight lines are prevailing such as structured environments where robots are moving. The objective is to maintain the right orientation during navigation and to detect and correct any change in this orientation comparing continuously the symmetry axes between images. The algorithm measures the positions and the lengths of these local symmetry axes and their relative importance by means of an accumulation map of each contributing segment. A definition of symmetry between two segments that allows us to calculate a local symmetry axis between them is also given.

关键词： Navigation Reflection Image segmentation Shape Layout Robotics and automation Machine vision computer vision Robot sensing systems Robot vision systems

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Design, Refinement and Accuracy of PID controllers

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IFAC Proceedings Volumes 2001年第13期34卷 675-680页

作者： Dumitru Popescu Catalin Petrescu Alexandru Fanea "Politehnica" University of Bucharest Department of Automatic Control and Computer Science 313 Splaiul Independentei Sector 6 77206 Bucharest ROMANIA

The paper presents some considerations about the design, refinement and accuracy of digital PID controllers. Starting from the robust-optimal design based on the sensitivity function of a continuous time PID controller, a discrete time equivalent is built. Several methods of quantization are introduced which improve the performances compared to the standard digital PID algorithm. Computational aspects and the efficiency of choosing the specific hardware support for PID algorithm implementation is discussed. Simulated results known that the achieved performances in closed loop implementation depend on the quality of design, but also of the rafinament and accuraccy of computed PID algorithm.

关键词： controller design robust control incremental algorithms PID rafinament computational accuracy simulation

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