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27th IASTED International Conference on Modelling, Identification, and control

作者： Keviczky, L. Bányász, Cs. Computer and Automation Research Institute Control Engineering Research Group Hungarian Academy of Sciences Kende u 13-17 H-1111 Budapest Hungary

The model based realizability loss part of the sensitivity function in a generic two-degree of freedom (TDOF) control system has an important role in shaping the deviation between our design goal and the nominal close... 详细信息

ISBN: (纸本)9780889867116

关键词： Degrees of freedom (mechanics)

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Experimental study of surface irregularities of low carbon steel in hot bar rolling

Experimental study of surface irregularities of low carbon s...

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12th International Conference on Metal Forming, METAL FORMING 2008

作者： Lee, Ho-Won Awais, Muhammad Im, Yong-Taek Lee, You-Hwan Son, Il-Heon Lee, Duk-Lak National Research Laboratory for Computer Aided Materials Processing Department of Mechanical Engineering ME 3227 KAIST Daejeon 305-701 Korea Republic of Wire Rod Research Group POSCO Technical Research Laboratories Pohang 790-785 Korea Republic of

In this study, the effect of processing parameters such as roll speed and initial rolling temperature on surface irregularities of low carbon steel during multi-pass hot bar rolling process was experimentally investigated. The experiments were carried out under various roll speeds and initial rolling temperatures by using the laboratory rolling mill. The rolled bars were cut and examined by optical microscopy to check the surface quality. Finite element analyses were also conducted for given conditions to validate the experimental results. For this, an instability map developed based on the specific plastic work approach was used to determine occurrence of instability during the process. From the current study, it was found that the increase of the rolling temperature and speed is important in reducing formation of surface irregularities in the process investigated. © 2008 Verlag Stahleisen GmbH, Düsseldorf.

关键词： Low carbon steel

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Plug & Test at system level via testable TLM primitives

Plug & Test at system level via testable TLM primitives

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International Test Conference 2008, ITC 2008

作者： Alemzadeh, Homa Carlo, Stefano Di Refan, Fatemeh Prinetto, Paolo Navabil, Zainalabedin CAD Research Group ECE Department University of Tehran Tehran 14399 Iran Control and Computer Engineering Department Politecnico di Torino I-10129 Torino Italy

ISBN: (纸本)9781424424030

With the evolution ofElectronic System Level (ESL) design methodologies, we are experiencing an extensive use of Transaction-Level Modeling (TLM). TLM is a high-level approach to modeling digital systems where details of the communication among modules are s eparated from the those of the implementation offunctional units. This paper represents a first step toward the automatic insertion of testing capabilities at the transaction level by definition of testable TLM primitives. The use of testable TLM primitives should help designers to easily get testable transaction level descriptions implementing what we call a "Plug & Test" design methodology. The proposed approach is intended to work both with hardware and software implementations. In particular, in this paper we willfocus on the design of a testable FIFO communication channel to show how designers are given the freedom of trading-off complexity, testability levels, and cost. C2008 IEEE.

关键词： Design for testability

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Static performance of hot bonded inserts in honeycomb panels

Static performance of hot bonded inserts in honeycomb panels

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49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

作者： Bianchi, G. Aglietti, G.S. Richardson, G. School of Engineering Sciences University of Southampton Southampton SO17 1BJ United Kingdom Surrey Satellite Technology Limited Tycho House Surrey Research Park Guildford GU2 7YE United Kingdom Astronautics Research Group AIAA Mechanical Computer Aided Design Group

An investigation on the structural performance of inserts within honeycomb sandwich panels is presented. The investigation only considers metallic inserts in all aluminum sandwich panels and emphasis is placed on the structural performance difference between hot bonded and cold bonded inserts. The former are introduced during panel manufacture while the latter are potted into existing panels. The investigation only deals with the static performance of the two insert systems subject to loads in the normal direction to the facing plane, which corresponds to their main mode of operation. The experimental part of the work presented involved carrying out pullout tests on hot bonded and cold bonded reference samples by loading them at a centrally located insert. As expected the hot bonded reference samples outperformed the cold bonded reference samples in terms of load carrying capabilities. An analytical model which allows the prediction of shear stress distribution in a circular sandwich panel normally loaded at a centrally located insert is used in an analytical approach for calculating the load carrying capability of inserts. The results from this analytical approach were found to correlate well with the experimental ones for the hot bonded inserts but not for the cold bonded inserts which actually failed at a significantly lower load than was predicted. Copyright © 2008 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Honeycomb structures

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A New Iterative Procedure to Obtain H-infinity, L-infinity Optimal Regulators

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IFAC Proceedings Volumes 2008年第2期41卷 8791-8796页

作者： L. Keviczky Cs. Bányász Computer and Automation Research Institute and Control Engineering Research Group Hungarian Academy of Sciences H-1111 Budapest Kende u 13-17 HUNGARY

The sensitivity function in a generic two-degree of freedom ( TDOF ) control system can be decomposed into three major parts: design-, realizability- and modeling-loss. The paper investigates the optimality of the sec... 详细信息

关键词： Optimal regulator error decomposition Youla-parametrization

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H-infinity, L-infinity optimal Youla regulators for two-degree of freedom control systems

H-infinity, L-infinity optimal Youla regulators for two-degr...

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Mediterranean Conference on control and Automation (MED)

作者： Cs. Banyasz L. Keviczky Computer and Automation Research Institute and Control Engineering Research Group Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The sensitivity function can be decomposed into three major parts: design-, realizability- and modeling-loss. The paper investigates the optimality of the second term in infinite norm spaces and proposes a new iterati... 详细信息

关键词： Automation Conferences

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IEEE Transactions on Haptics: Editorial

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IEEE Transactions on Haptics 2008年第1期1卷 2-8页

作者： Edward Colgate, J. Lederman, Susan Prattichizzo, Domenico Barbagli, Federico Basdogan, Cagatay Buss, Martin Ernst, Marc Frisoli, Antonio Gillespie, Brent Grant, Danny Harders, Matthias Hayward, Vincent Jones, Lynette Kajimoto, Hiroyuki Kappers, Astrid Kheddar, Abderrahmane Lin, Ming C. MacLean, Karon Miller, Brian Noma, Haruo Okamura, Allison M. O'Malley, Mareia Ryu, Jeha Tan, Hong Z. Yokokohji, Yasuyoshi Department of Psychology School of Computing Queen's University Canada IEEE Robotics and Automation Society Tübingen Germany Stanford University's Computer Science Department Tübingen Germany Institute of Automatic Control Engineering Technische Universität München Germany Independent Research Group Multisensory Perception and Action Max Planck Institute for Biological Cybernetics Tübingen Germany Department of Applied Mechanics SSSA Japan Research Division Virtual Reality and Telerobotic Systems PERCRO Laboratory Japan Department of Mechanical Engineering Japan Department of Robotics McGill University Canada Computer Vision Lab ETH Zurich Japan Virtual Reality in Medicine Group Japan IEEE CS/RAS Technical Committee on Haptics Japan Department of Electrical and Computer Engineering McGill University Canada Department of Mechanical Engineering MIT Japan University of Electro-Communications Japan Department of Physics and Astronomy Utrecht University Netherlands University of Evry France Chapel Hill United States Department of Computer Science University of British Columbia Canada ATR Knowledge Science Lab United Kingdom Department of Mechanical Engineering Denmark Johns Hopkins University United States Laboratory for Computational Sensing and Robotics United Kingdom Engineering Research Center for Computer-Integrated Surgical Systems and Technology United States Mechanical Engineering and Materials Science Department Rice University United States Korea Republic of Department of Electrical and Computer Engineering Mechanical Engineering and Psychological Sciences Purdue University United States Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Japan

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"Plug & Test" at System Level via Testable TLM Primitives

"Plug & Test" at System Level via Testable TLM Primitives

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IEEE International Test Conference

作者： Homa Alemzadeh Stefano Di Carlo Fatemeh Refan Paolo Prinetto Zainalabedin Navabi CAD Research Group ECE Department University of Tehran Tehran Iran Control and Computer Engineering Department Politecnico di Torino Torino Italy

With the evolution of Electronic System Level (ESL) design methodologies, we are experiencing an extensive use of Transaction-Level Modeling (TLM). TLM is a high-level approach to modeling digital systems where details of the communication among modules are separated from the those of the implementation of functional units. This paper represents a first step toward the automatic insertion of testing capabilities at the transaction level by definition of testable TLM primitives. The use of testable TLM primitives should help designers to easily get testable transaction level descriptions implementing what we call a "Plug & Test" design methodology. The proposed approach is intended to work both with hardware and software implementations. In particular, in this paper we will focus on the design of a testable FIFO communication channel to show how designers are given the freedom of trading-off complexity, testability levels, and cost.

关键词： System testing Plugs Automatic testing Digital systems Communication channels Design methodology Costs Hardware Design for testability Electronic design automation and methodology

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Decentralized Robust PI controller Design For An Industrial Utility Boiler - An IMC Method

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IFAC Proceedings Volumes 2008年第2期41卷 14235-14240页

作者： Horacio Jose Marquez Batool Labibi Tongwen Chen Advanced Process Automation and Control (APAC) Research Group K. N. Toosi University of Technology Tehran Iran Electrical and Computer Engineering Department University of Alberta Edmonton Canada

This paper presents a scheme for designing a robust decentralized PI controller for an industrial utility boiler system. First, a new method for designing robust decentralized PI controllers for uncertain LTI MIMO systems is presented. Sufficient conditions for closed-loop stability and diagonal dominance of a multivariable system are given. For each isolated subsystem a first order approximation is obtained. Then, achieving robust stability and closedloop diagonal dominance is formulated as local robust performance problems. It is shown by selecting time constants of the closed-loop isolated subsystems appropriately, these local robust performance problems are solved and the interactions between closed-loop stabilized subsystems are attenuated. The internal model control (IMC) method is used to design local PI controllers. The suggested design strategy is applicable to unstable systems as well. Thereafter, the nonlinear model of an industrial utility boiler is linearized about its operating points and the nonlinearity is modeled as uncertainty for a nominal LTI MIMO system. Using the new proposed method, a decentralized PI controller for the uncertain LTI nominal model is designed. The designed controller is applied to the real system. The simulation results show the effectiveness of the proposed methodology.

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Real-Time Level Plant control Using Improved BELBIC

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IFAC Proceedings Volumes 2008年第2期41卷 4631-4635页

作者： M. Masoudinejad R. Khorsandi A. Fatehi C. Lucas S. Fakhimi Derakhshan M.R. Jamali Advanced Process Automation & Control (APAC) Research Group Faculty of Electrical Engineering K. N. Toosi University of Technology Tehran Iran Center of Excellence for Control and Intelligent Processing Electrical and Computer engineering Department University of Tehran Iran

Brain emotional learning based intelligent controller (BELBIC) is based on computational model of limbic system in the mammalian brain. In recent years, this model was applied in many linear and nonlinear control applications. Previous studies show that this controller has fast response, simple implementation and robustness with respect to disturbances. It is also possible to define emotional signal based on control application objectives. But in the previous studies, internal instability of this controller was not considered and control task were done in limited time period. In this article mathematical description of BELBIC is investigated and improved to avoid internal instability. Simulation and implementation of improved model was done on level plant. The obtained results showed that instability of model has been solved in the new model without loss of performance by using Integral Anti Windup (IAW).

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