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Hybrid Modelling of Interstitial Free (IF) Steel

IFAC Proceedings Volumes 2006年第22期39卷 11-16页

作者： M.F. Abbod M. Mahfouf C.M. Sellars D.A. Linkens IMMPETUS Institute for Microstructural and Mechanical Process Engineering: The University of Sheffield Department of Automatic Control and Systems Engineering The University of Sheffield Sheffield UK

Modelling of the recrystallisation kinetics of Interstitial Free (IF) steel after hot deformation using plane strain compression (PSC) at strain rates from 0.1 to 10 s −1 over a temperature range of 700 to 900 °C has been carried out. The model is based on a hybrid modelling technique combining neuro-fuzzy models and physical equations. Explicitly. the model has been developed based on an inverse modelling strategy which involves predicting the internal states behaviour of the material based on the deformation conditions and the recrystallisation properties.

关键词： Alloy materials inverse modelling material properties hybrid model strain stress IF steel

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Influence of scaling and unfolding in PCA based monitoring of nutrient removing batch process

Influence of scaling and unfolding in PCA based monitoring o...

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作者： Ruiz, Magda Villez, Kris Sin, Gurkan Colomer, Joan Vanrrolleghem, Peter Control Engineering and Intelligent Systems Group -eXiT Department of Electronics Computer Science and Automatic Control University of Girona CP 17071 Girona Spain Department of Applied Mathematics Biometrics and Process Control Ghent University Coupure Links 653 B-9000 Ghent Belgium

ISBN: (纸本)9783902661142

The data set of batch biological and biotechnological processes can be organized in a three-way data matrix. In this paper the usefulness of different PCA approaches for monitoring is analyzed. Different ways of unfolding and scaling of data have been applied to a pilot-scale SBR data. PCA is used to reduce the dimensionality and to remove the non-linearity dynamic of the data. Moreover, a new method to select the number of principal components is proposed. Loadings graphics are used to determinate the predominant variables for each one. The results show that whatever model can be applied depending on the goal of the monitoring, however the models implicate possible false alarms or faults omission. Copyright © 2006 IFAC.

关键词： process monitoring

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Nonlinear model predictive control of a turbocharged diesel engine

Nonlinear model predictive control of a turbocharged diesel ...

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IEEE International Conference on Computer-Aided Design

作者： Martin Herceg Tobias Raff Rolf Findeisen Frank Allgowe Department of Information Engineering and Process Control Slovak University of Technology Slovakia Institute for Systems Theory and Automatic Control (IST) University of Stuttgart Germany

control of turbocharged diesel engines is a challenging task due to system nonlinearities and constraints on the inputs and process variables. In this paper nonlinear model predictive control is applied to control a diesel engine with a variable geometry turbocharger and an exhaust gas recirculation valve. The overall control objective is to regulate the setpoints of the air-fuel ratio and the amount of recirculated exhaust gas in order to obtain low exhaust emission values and low fuel consumption without smoke generation. Simulation results are presented to study the advantages and disadvantages of nonlinear model predictive control. The achieved performance is compared in simulations with a linear state feedback controller and an input-output linearization based control method. As shown, nonlinear model predictive control achieves good overall control performance and constraint satisfaction.

关键词： Predictive models Predictive control Diesel engines Linear feedback control systems Nonlinear control systems control nonlinearities control systems Solid modeling Geometry Valves

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General representation theorems for fuzzy weak orders

General representation theorems for fuzzy weak orders

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International Workshops of COST Action 274 on Theory and Applications of Relational Structures as Knowledge Instruments II, TARSKI 2002-2005

作者： Bodenhofer, Ulrich De Baets, Bernard Fodor, Janos Institute of Bioinformatics Johannes Kepler University A-4040 Linz Austria Dept. of Applied Mathematics Biometrics and Process Control Ghent University Coupure links 653 B-9000 Gent Belgium Institute of Intelligent Engineering Systems Budapest Tech. H-1034 Budapest Hungary

ISBN: (纸本)3540692231

The present paper gives a state-of-the-art overview of general representation results for fuzzy weak orders. We do not assume that the underlying domain of alternatives is finite. Instead, we concentrate on results that hold in the most general case that the underlying domain is possibly infinite. This paper presents three fundamental representation results: (i) score function-based representations, (ii) inclusion-based representations, (iii) representations by decomposition into crisp linear orders and fuzzy equivalence relations. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Functions

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control of the multi agent micro-robotic platform MiCRoN

Control of the multi agent micro-robotic platform MiCRoN

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IEEE International Conference on Computer-Aided Design

作者： Panagiotis Vartholomeos Savvas Loizou Michael Thiel Kostas Kyriakopoulos Evangelos Papadopoulos Mechanical Engineering Department Control Systems Laboratory National and Technical University of Athens Athens Greece GRASP lab University of Pennsylvania Philadelphia PA USA Mechanical Engineering Department Control Systems Laboratory National and Technical University of Athens Greece Institute for Process Control and Robotics University of Karlsruhe Karlsruhe Germany

This paper presents the theoretical framework for the centralized control architecture of the multi agent micro-robotic platform MiCRoN. The entire control system architecture integrates sensory modules, modeling modules, and control modules. The latter are composed by (i) a high level simulation and autonomous execution unit that is capable for on-line multi-robot navigation with collision avoidance, (ii) a trajectory tracking unit for manipulation purposes, and (iii) a low level position controller that performs position control exploiting machine learning algorithms. The high level controllers take into account behaviors specific to the micro-scale. The performance of the layered control system is evaluated through simulations and preliminary hardware experiments on a micro-robotic platform. The application domain of the MiCRoN platform is cell manipulation, and 3-D assembly for micro-fabrication.

关键词： control systems Robots Nanobioscience Mechanical engineering Robotics and automation Navigation Centralized control Assembly systems Robotic assembly Trajectory

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INFLUENCE OF SCALING AND UNFOLDING IN PCA BASED MONITORING OF NUTRIENT REMOVING BATCH process

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IFAC Proceedings Volumes 2006年第13期39卷 114-119页

作者： Magda Ruiz Kris Villez Gurkan Sin Joan Colomer Peter Vanrrolleghem 1Control Engineering and Intelligent Systems Group –eXiT Department of Electronics Computer Science and Automatic Control University of Girona Campus Montilivi CP 17071 Building PIV Girona - Spain Department of Applied Mathematics Biometrics and Process Control Ghent University Coupure Links 653 B-9000 Ghent – Belgium

关键词： Biological process process monitoring Multiway Principal Component Analysis (MPCA)

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Scanning surface inspection system with defect-review SEM and analysis system solutions

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Hitachi Review 2006年第2期55卷 78-82页

作者： Ota, Hideo Hachiya, Masayuki Ichiyasu, Yoji Kurenuma, Toru Application Technology Department Semiconductor Process Control Systems Sales Division Hitachi High-Technologies Corporation Optical Inspection Systems Design Department Nanotechnology Products Business Group Hitachi High-Technologies Corporation Design Department II Development And. Production Division Hitachi Kenki FineTech Co. Ltd.

OVER VIEW: Data obtained from wafer-surface inspection tools are limited to defect maps, defect number, etc. In any case, in order to swiftly execute measures to decrease the amount of defects, it is very important to determine where the defects are being generated. Accordingly, more concrete information on defects, such as shape and constitution data, is becoming more necessary. Hitachi High-Technologies Corporation is therefore offering a line-up of wafer-surface defect inspection tools and review scanning electron microscopes, and Hitachi Kenki FineTech Co., Ltd. is offering a line-up of atomic-force microscopes. In the present work, a system of improving yields by providing surface-analysis information about unpatterned silicon wafers-called "smart root cause analysis"-was developed. From now onwards, although defect observation based on the output coordinates from surface inspection of unpatterned silicon wafers is extremely difficult owing to a lack of an alignment basis, the developed system can address this difficulty and make a key contribution to crucial defect countermeasures with high efficiency.

关键词： Defects

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Experimental modal analysis of a scaled car body for metro vehicles

Experimental modal analysis of a scaled car body for metro v...

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13th International Congress on Sound and Vibration 2006, ICSV 2006

作者： Popprath, S. Benatzky, C. Bilik, C. Kozek, M. Stribersky, A. Wassermann, J. Institute of Mechanics and Mechatronics Division of Measurement and Actuator Technology Vienna University of Technology Wiedner Hauptstraße 8-10/E325/A4 A-1040 Vienna Austria Institute of Mechanics and Mechatronics Division of Control and Process Automation Vienna University of Technology Gußhausstraße 27-29/E325/A5 A-1040 Vienna Austria Siemens Transportation Systems GmbH and Co KG Leberstraße 34 A-1110 Vienna Austria

ISBN: (纸本)9781627481502

This contribution deals with the investigation of an approximately 1/10-scaled model of a metro vehicle car body concerning the low structural eigenmodes. The model has been developed by means of finite element calculations in such a way that the eigenfrequencies of the model lie close together. An experimental modal analysis has been carried out to determine the structural dynamics behavior of the realized model. The achieved results verify the predicted dense lying eigenfrequencies. In addition to that the accomplished experimental modal analysis provides a sophisticated basis to improve the modelling of the investigated structure for control purposes. Such simulations and measurements are done to support design developments and concepts to achieve a higher ride quality for metro vehicles.

关键词： Structural dynamics

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Development of the laser spot welded stainless steel panel for vehicle body

Development of the laser spot welded stainless steel panel f...

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ICALEO 2006 - 25th International Congress on Applications of Laser and Electro-Optics

作者： Oikawa, Masashi Minamida, Katsuhiro Kumehara, Hiroyuki Department of Mechanical System Engineering Gunma University 1-5-1 Tenjin Kiryu Gunma 375-8515 Japan Nippon Steel Corporation Instrument and Control R and D Division Environment and Process Technology Center 20-1 Shintomi Futtsu Chiba 293-0011 Japan Gunma University 1-5-1 Tenjin Kiryu Gunma 375-8515 Japan

To evaluate the mechanical properties in which the laser spot welded stainless steel panel for vehicle body applications is applied as outside plates to improve corrosion resistance and heat hardiness of conventional aluminium honeycomb panels, the static and fatigue tests were carried out. This panel consists of two face sheets and truss shaped corrugation core. They are assembled by the laser spot welding and the feature of this panel is that the weld mark are not existed in outside face sheet of panels. A conventional 300 W pulse Nd:YAG laser with optical fibre and focusing system is applied for spot welding between face sheets and corrugated core. Outside face sheet thickness is 1.0 mm, inside face sheet thickness is 0.8 mm, and core thickness is 0.4 mm. Especially to weld outside face sheet and core, closely controlled laser beam is irradiated from core side to obtain half penetration condition in outside face sheet. The laser spot welded stainless steel panel is sufficient for application as a structural material for any kind of vehicle bodies.

关键词： Welds

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ROBUST STABILITY CHECKING OF A CLASS OF LINEAR INTERVAL FRACTIONAL ORDER SYSTEM USING LYAPUNOV INEQUALITY

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IFAC Proceedings Volumes 2006年第11期39卷 89-94页

作者： Hyosung Ahn YangQuan Chen Igor Podlubny Center for Self-Organizing and Intelligent Systems (CSOIS) Department of Electrical and Computer Engineering Utah State University Logan UT 84322-4160 USA Department of Applied Informatics and Process Control Technical University of Kosice B. Nemcovej 3 04200 Kosice Slovak Republic

This paper provides a new analytical robust stability checking method of fractional-order linear time invariant interval uncertain system. This paper continues the authors’ previous work (Chen et al., 2005a) where matrix perturbation theory was used. For the new robust stability checking, Lyapunov inequality is utilized for finding the maximum eigenvalue of a Hermitian matrix. Through numerical examples, the usefulness and the effectiveness of the newly proposed method are verified.

关键词： Fractional order linear dynamic systems robust stability interval linear time invariant systems interval matrix

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