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SUGAR FACTORY SIMULATOR FOR OPERATORS TRAINING

IFAC Proceedings Volumes 2006年第6期39卷 259-264页

作者： A. Merino R. Mazaeda R. Alves A. Rueda L.F. Acebes de Prada C. Center of Sugar Technology.University of Valladolid. Edificio Alfonso VIII. Real de Burgos s/n. Valladolid 47011. Spain Department of System Engineering and Automatic Control University of Valladolid. Faculty of Sciences. c/ Real de Burgos s/n 47011 Valladolid Spain

This paper presents the main features of a sugar factory training simulator currently used for control room operators training. This simulator is based on a realistic distributed real time simulation of the whole factory and in a mimic of the control system. It allows the familiarization of the operators with the process and control system as well as with the process information that they use in the real plant. The main aims of the simulator are: (i) to guarantee operators knowledge of the process, and its control system; (ii) to test potentially dangerous situations and (iii) to identify possible problems sources and learn to correct them.

关键词： Training Simulators Physical Modelling Distributed simulation Sugar Factories

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Tool supporting the co-design of control systems and their real-time implementation: Current status and future directions

Tool supporting the co-design of control systems and their r...

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IEEE International Conference on Computer-Aided Design

作者： Martin Torngren Dan Henriksson Karl-Erik Arzen Anton Cervin Zdenek Hanzalek Division of Mechatronics Department of Machine Design Kungliga Tekniska Högskolan Stockholm Sweden Department of Automatic Control Lund Institute of Technology Sweden Faculty of Electrical Engineering Czech Technical University Prague Czech Republic

control systems design has traditionally been treated separately from the design of its software and hardware implementation. The increasing use of embedded control in for example distributed, safety critical and mass-produced systems has caused an increasing need for the simultaneous consideration of the control system and its implementation platform during development. To this end, there is a need for both theoretical contributions and supporting tools that assist designers in understanding and analyzing the intricate relationships between the qualities, such as control performance, robustness and cost, and design parameters related to control system and platform design. This paper explores issues in co-design. A number of representative tools are compared with the purposes of illustrating different approaches concerning the levels of abstraction, analysis vs. synthesis features, constraints addressed and usability features. A perspective to the co-design tools is also provided, where opportunities and challenges for future design environments are discussed.

关键词： control systems Real time systems Software design Hardware Safety Performance analysis Robust control Costs control system synthesis Usability

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Time-sliding suboptimal regulation of bilinear interconnected systems

Time-sliding suboptimal regulation of bilinear interconnecte...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： M. de la Sen A.J. Garrido J.C. Soto O. Barambones F.J. Maseda I. Garrido Institute of Research and Development of Processes IIDP. Department of Electricity and Electronics Faculty of Science and Technology University of Basque Country (UPV-EHU) Leioa Spain Department of Systems Engineering and Automatic Control. EUITI de Bilbao University of Basque Country (UPV-EHU) Spain

This paper focuses on the suboptimal regulation of multivariable discrete-time bilinear systems consisting of interconnected bilinear subsystems with respect to a linear quadratic optimal regulation criterion which involves the use of state weighting terms only. Three transformations are used in order to treat the scheme over an equivalent linear system. This leads to the appearance of quadratic weighting terms related to both transformed input and state variables. In this way, a Ricatti matrix-sequence allowing the synthesis of a standard feedback control law is obtained

关键词： Interconnected systems Nonlinear systems controllability automatic control control systems Power system modeling Research and development systems engineering and theory Optimal control Linear systems

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EDUSCA (EDUCATIONAL SCADA): FEATURES AND APPLICATIONS

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IFAC Proceedings Volumes 2006年第6期39卷 614-619页

作者： Ra#uAl Alves Santos Julio E. Normey-Rico Alejandro Merino Gómez Cesar de Prada Moraga Center of Sugar Tecnology. University of Valladolid. Edificio Alfonso VIII 47011. Valladolid. Spain Department of Automation and Systems. Federal University of Santa Catarina. 88040-900 CTC-UFSC. Florianópolis-SC Brazil Department of Systems Engineering and Automatic Control. University of Valladolid. Faculty of Sciences c/ Real de Burgos s/n 47011 Valladolid Spain

This paper presents EDUSCA, an EDUcational SCAda with OPC data access. EDUSCA was specially designed for automatic control education, research and operator training purposes. The developed system takes advantage of the facilities offered by the OPC communication architecture. The system allows the students to face real practical problems, could be used to train operators in plant supervision and also allows the implementation of research functionalities. Their main advantages of EDUSCA are: (i) it can be connected to any plant whenever it includes OPC communications; (ii) it is free of licenses, thus it can be installed in many computers as necessary; (iii) it can be adapted to each application requirements and (iv) it allows the implementation of a diverse set of functionalities, as for example, control algorithms.

关键词： SCADA Supervisory control Process control Training control Education

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Fragmentation and allocation of object-oriented databases for simple attributes and complex methods: A cost-based technique

Fragmentation and allocation of object-oriented databases fo...

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ITI 3rd International Conference on Information and Communications Technology, ICICT 2005 - Enabling Technologies for the New Knowledge Society

作者： Faheem, Mohamed T. Sarhan, Amany Ibrahem, Rashad L. Computers and Automatic Control Engineering Faculty of Engineering Tanta University Egypt Electrical Engineering Department High Institute of Energy Egypt

ISBN: (纸本)0780392701

The efficiency of the distributed systems is most often dominated by the network communications between the different sites. In distributed database systems, the communication between the different sites is almost essential to satisfy a query. In order to minimize the time required to respond to a query in such systems, a reliable fragmentation technique is required to place the data as close to its user as possible. The placement of these fragments to the proper sites is a complementary step to assure the right position of these fragments. The previous fragmentation techniques provided a way for fragmentation of the database that is followed by an allocation technique to allocate the produced fragments as separate steps. The key idea of this paper is that it introduces a novel technique that combines both the fragmentation and allocation processes into one composite process thus putting into consideration the allocation constraints while fragmenting the data. It also simplifies the effort required to get the best fragments and the best location of these fragments. This proposed technique relies on a cost-based model rather than an affinity model as being used in previous techniques. The case of simple methods and complex attributes database is considered in this paper. The results obtained by the technique proofed the effectiveness and usefulness of the proposed technique.

关键词： Database systems

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The design of an resource planning software application for manufacturing control

The design of an resource planning software application for ...

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EUROCON 2005 - The International Conference on Computer as a Tool

作者： Dumbrava, St. Valova, I.M. Department of Automatic Control and Industrial Informatics Faculty of Automatic Control and Computer Engineering Technical University of Iasi Romania Department of Computer Systems University of Rousse Bulgaria

ISBN: (纸本)142440049X

Markets globalization makes industrial companies to change radically, becoming more flexible, customer oriented and ague in manufacturing. Consequently, the enterprise software applications are becoming more and more complex, exploiting distributed object technology in multi-tier architectures. The aim of the paper is to present the design specification for an enterprise application that integrates the ERP concept in three-tier architecture, containing modularized, distributed subsystems in configurable and maintainable software. Starting from the customer order, to planned order dispatch, the ERP main components and the information flow within the system is presented. Then, the software architecture is discussed, where the ERP components are implemented using Enterprise Java Beans (EJB), deployed in a J2EE application server, for performing transactions with business environment and the database. Constructing the visual model in Unified Modeling Language (UML), the application is designed and analyzed. The use case diagram of the system is presented. © 2005 IEEE.

关键词： Enterprise resource planning

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A frequency domain design technique for robust decentralized controllers

A frequency domain design technique for robust decentralized...

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作者： Kozáková, Alena Veselý, Vojtech Department of Automatic Control Systems Faculty of Electrical Engineering and Information Technology Slovak University of Technology Bratislava Slovakia

ISBN: (纸本)008045108X

The paper proposes a new frequency domain approach to the design of robust decentralized controllers (DC) for continuous-time systems described by a set of transfer function matrices. To guarantee the nominal stability and the prespecified nominal performance, the recently developed DC design technique (Kozáková and Veselý, 2003) has been applied, adapted so as to guarantee the robust M-Δ structure based stability conditions modified for the closed-loop system under decentralized controller as well. Unlike the standard robust approaches to the DC, this technique allows the inclusion of the nominal interactions into the nominal model;thus the conservativeness of the robust stability conditions is relaxed. Copyright © 2005 IFAC.

关键词： Continuous time systems

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Highly scalable, reversible and embedded image compression system

Highly scalable, reversible and embedded image compression s...

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WEC'05: 3rd World Enformatika Conference

作者： González, Federico Pérez Ordorika, Iñaki Goiricelaia Bengoa, Pedro Iriondo Faculty of Engineering Department of Automatic Control Basque Country University Bilbao Spain Faculty of Engineering Department of Telecommunications Basque Country University Bilbao Spain

ISBN: (纸本)9759845849

A new method for low complexity image coding is presented, that permits different settings and great scalability in the generation of the final bit stream. This coding presents a continuous-tone still image compression system that groups loss and lossless compression making use of finite arithmetic reversible transforms. Both transformation in the space of color and wavelet transformation are reversible. The transformed coefficients are coded by means of a coding system in depending on a subdivision into smaller components (CFDS) similar to the bit importance codification. The subcomponents so obtained are reordered by means of a highly configure alignment system depending on the application that makes possible the re-configure of the elements of the image and obtaining different levels of importance from which the bit stream will be generated. The subcomponents of each level of importance are coded using a variable length entropy coding system (VBLm) that permits the generation of an embedded bit stream. This bit stream supposes itself a bit stream that codes a compressed still image. However, the use of a packing system on the bit stream after the VBLm allows the realization of a final highly scalable bit stream from a basic image level and one or several enhance levels. COPYRIGHT © ENFORMATIKA.

关键词： Image compression

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Robust PSS design for a multivariable power system

Robust PSS design for a multivariable power system

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2005 IEEE Russia Power Tech, PowerTech

作者： Veselý, V. Kozáková, A. IEEE Department of Automatic Control Systems Faculty of Electrical Engineering and IT Slovak University of Technology Ilkovicova 3 812 19 Bratislava Slovakia

ISBN: (纸本)9781424418749

The paper deals with the frequency domain design of a robust power system stabilizer (PSS) for a multivariable power system. The proposed PSS design procedure is based on a novel approach that applies the independent design methodology to the so-called equivalent subsystems along with the well-known Small Gain theory and the robust stability conditions in the M-Δ setup. Theoretical results have been applied to the design of a robust multivariable PSS for a part of the Power system of the Slovak Republic.

关键词： Design

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Investigation of parameter perturbation region for positive polynomials

Investigation of parameter perturbation region for positive ...

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作者： Tibken, Bernd Dilaver, Kamil Fatih Department of Automatic Control Faculty of Electrical Information and Media Engineering University of Wuppertal Rainer-Gruenter-Str. 21 42119 Wuppertal Germany

ISBN: (纸本)008045108X

in this paper the robust positivity of polynomials under coefficient perturbation is investigated. This robust positivity of polynomials can be used for polynomial systems in order to determine the robust asymptotic stability of the system. It is assumed that the polynomials under investigation depend linearly on some parameters. The aim in the article is to determine the parameter perturbation region as a hypersphere, for which the polynomial is globally positive. The theorem of Ehlich and Zeller is used to achieve this aim. This theorem enables to give conditions in the parameter space for global positivity. These conditions are linear inequalities. By means of these inequalities an inner and an outer approximation are calculated to the relevant perturbation region which is a hypersphere. Two nontrivial examples conclude the paper and show the effectiveness of the presented method. Copyright © 2005 IFAC.

关键词： Polynomials

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