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Grey-Box Modeling for Identification and control: An Emerging Discipline or an Established Technology?

IFAC Proceedings Volumes 1994年第8期27卷 1193-1198页

作者： S. Bay Jorgensen K.M. Hangos Department of Chemical Engineering Technical University of Denmark Systems and Control Research Laboratory: Computer and Automation Institute HAS

Grey box modeling is a widely used term, which presently reflects that both a priori and experimental knowledge is being incorporated into the model building process. A brief investigation into various uses of grey box modeling approaches reveals that they mainly differ with respect to the required model accuracy. The goal of the model application also has to be considered in the model building, since it constrains the necessary accuracy required by the model. In this paper these two viewpoints are combined thus leading to a proposed new definition of grey box modeling.

关键词： Qualitative differential and algebraic equations Uncertainty representation Verbatim models Robust identification and control Modeling cycle

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Model-based computer control of Kappa number in magnefite pulp cooking

Model-based computer control of Kappa number in magnefite pu...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Juricic Department of Computer Automation and Control Jožef Stefan Institute Ljubljana Slovenia

The aim of this contribution is to present a model-based system for Kappa control in batch pulp cooking. Kappa is one of the parameters that reflect quality of the pulp. In order to keep the quality uniform, Kappa value at the end of the batch should dissipate as little as possible. Target Kappa is controlled (among others) by careful selection of cooking times which depend on charging and cooking conditions. Since appropriate industrial sensors for online Kappa measurements in batch digesters are still not available, current Kappa values have to be "sensed" by means of the mathematical model. In this paper an extended Vroom's model is adopted for online Kappa prediction and adaptive control. A model represents the essential part of the system for digester control. Provided uniform charging conditions are guaranteed, the computer control system is shown to be able to give on average better results than manual control even if performed by experienced operators.< >

关键词： Adaptive control Process control Pulp and paper industry

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A Process Laboratory for Analysis, Education and Research of control Engineering Approaches and Methods - A Concept

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IFAC Proceedings Volumes 1994年第9期27卷 249-252页

作者： A. Vizjak B. Zupančič J. Petrovčič V. Jovan S. Strmčnik Jožef Stefan Institute Department of Computer Automation and Control Jamova 39 61111 Ljubljana Slovenia

Design of a process control laboratory requires a detailed definition of the purpose and form of laboratory process equipment, the structure of the control system and the system of flexible signal connections. This paper describes the main purposes of process control laboratory, the essential criteria which have influenced the choice of laboratory process equipment, the design of laboratory process control system and the guidelines for designing the signal connections between the laboratory process equipment and its control system.

关键词： Education process control conventional control computer control control systems design control engineering applications of computer

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Magnetic Bearing control Systems and Adaptive Forced Balancing

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IEEE control Systems 1994年第2期14卷 4-13页

作者： Shafai, B. Beale, S. LaRocca, P. Cusson, E. Department of Electrical and Computer Engineering Northeastern University Boston MA 02115 United States Brooks Automation Lowell MA 01851 United States Circuit Design and Applied Control Division MS 29 The Charles Stark Draper Laboratory Inc. Cambridge MA 02139 555 Technology Square United States

Active magnetic bearing (AMB) actuators support rotors without friction but require feedback control for stabilization and performance. We address the application of modern control techniques such as LQG/LTR, H/spl infin/, and QFT to AMB systems. We also introduce a novel method called adaptive forced balancing (AFB) which solves the problem of synchronous vibration caused by mass unbalance. Simulation and experimental results are included to show the performance of AFB as applied to single-end AMB suspensions (SISO systems). Finally, AFB with frequency tracking and its generalization for double-end AMB suspensions (MIMO systems) are briefly explored. © 1994 IEEE

关键词： Magnetic levitation Force control control systems Adaptive systems Programmable control Adaptive control Suspensions Actuators Friction Feedback control

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A Simulation, Environment for Eyaluation of Kowledge Based Fault Diagnosis Systems

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IFAC Proceedings Volumes 1994年第10期27卷 59-64页

作者： Alenka Žnidaršič Victor J. Terpstra Henk B. Verbruggen Jožef Stefan Institute Department of Computer Automation and Control Jamova 39 61111 Ljubljana Slovenia Delft University of Technology Department of Electrical Engineering. Control Laboratory P.O. Box 5031. 2600 GA Delft The Netherlands

In the paper a simulation environment for evaluation of knowledge based fault diagnostic systems is presented. The contribution deals with the concept of the environment that provides an integration of qualitative and quantitative models. This concept is presented on a simulated water-column process controlled by feedback. The simulation environment is used to evaluate the potentials of Multilevel Flow Modelling (MFM) approach to system diagnosis. The environment is realized within the real-time expert system tool G2.

关键词： Fault diagnosis multilevel flow models simulation model-based reasoning

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A method for evaluating software engineering environments

A method for evaluating software engineering environments

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： M.A. Taylor J.E. Urban Industrial Automation and Control Honeywell Inc. Phoenix AZ USA Department of Computer Science and Engineering Arizona State University Tempe AZ USA

A major obstacle blocking the widespread deployment of software engineering environments is the absence of generally accepted quantitative methods to measure the benefits or value, of their use. Such an evaluation technique can be used to identify settings where environments may have the greatest benefit, suggest directions for research efforts, and allow potential users to make informed choices among various candidates. The evaluation method presented here is inexpensive and easy to apply. The method is independent of any specific software engineering environment, process model, or methodology. The evaluation questionnaire enforces a distinction between perceptions of the development setting and perceptions of the utility of the software engineering environment. The method is composed of evaluation criteria and evaluation scales from the body of work in software measurement. automation of the evaluation method is straight forward.< >

关键词： Software engineering automation Standardization Software measurement Capability maturity model computer industry Industrial control Automatic control Software metrics Measurement standards

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Computational architectures for the control of underwater robots

Computational architectures for the control of underwater ro...

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OCEANS

作者： P. Baiardi P. Bianchetti G. Bruzzone G. Cannata G. Casalino G. Veruggio DIST Department of Communication Computer and Control Sciences University of Genova Genoa Italy IAN-CNR Naval Automation Institute National Research Council Genoa Italy

The objective of this paper is to present the current activities, jointly carried out by DIST and LAN, in the development of a computational architecture for the control of advanced robot systems. In particular, the activity is focused on marine and underwater applications. The problem of the control of advanced robot systems is discussed. A Lyapunov based approach to the synthesis of the control laws in task space domain is presented. Moreover, experimental setups implementing the proposed control scheme are briefly described.< >

关键词： computer architecture Robot control Robot kinematics Robotics and automation Machine vision Automatic control Communication system control control systems Humans Robot sensing systems

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An experimental system for path tracking of a robot using a 16*16 connected component detector CNN chip with direct optical input

An experimental system for path tracking of a robot using a ...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： P. Szolgay A. Katona G. Eross A. Kiss Analogical and Neural Computing Laboratory Computer and Automation Hungarian Academy of Sciences Budapest Hungary Department of Information & Control Engineering TU Visual and Neural Computing Laboratories Veszprem Hungary

An experimental system was built up and tested for optical path tracking of a robot, where a 16*16 connected component detector chip with direct optical input was used. The speed of computation in the experimental arc... 详细信息

关键词： Detectors Cellular neural networks Robot sensing systems Optical sensors computer architecture Optical devices Fault tolerance Charge coupled devices

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A graph-theoretic approach to integrated process and control system synthesis

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IFAC Proceedings Volumes 1994年第7期27卷 61-66页

作者： K.M. Hangos F. Friedler J.B. Varga L.T. Fan Systems and Control Research Laboratory Computer and Automation Institute Hungarian Academy of Sciences H-1518 Budapest Pf. 63 Hungary Department of Systems Engineering Research Institute of Chemical Engineering Hungarian Academy of Sciences H-8201 Veszprim Pf 125 Hungary Department of Chemical Engineering Kansas State University Manhattan KS 66506 USA

A graph-theoretic method for integration of process and control system (IPCS) syntheses has been proposed in the present paper. The foundation of this integration is a well-established, graph-theoretic approach to process synthesis in conjunction with the analysis of structural controllability based on digraph-type process models. A directed bipartite graph, the CP-graph, has been introduced for unambiguous representation of an IPCS structure. The notion of CP-graph has given rise to a set of axioms for describing the combinatorially feasible and controllable structures. The maximal controllable structure of an IPCS synthesis problem has been defined as the union of combinatorially feasible and controllable IPCS structures; obviously, the optimal IPCS structure must be a substructure of this maximal controllable structure. Thus, the mathematical programming model, e.g., MINLP model, of an IPCS synthesis problem should be derived from the maximal controllable structure. The fundamental combinatorial algorithm of IPCS synthesis, i.e., algorithm CMSG, for identifying this maximal controllable structure has been formulated. The complexity of this algorithm has been proved to be polynomial on the size of the problem; its efficacy is illustrated with a relatively simple example. The resultant IPCS structures are compared with the structures synthesized without considering their control systems.

关键词： Process control control system synthesis structural controllability combinatorial mathematics synthesis methods

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MODULA-2 BASED MULTITASKING ENVIRONMENT FOR A FLEXIBLE BIPROCESSOR controlLER

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MICROPROCESSORS AND MICROSYSTEMS 1993年第2期17卷 83-91页

作者： GODENA, G PETROVCIC, J J. Stefan Institute Department of Computer Automation and Control PO Box 100 Jamova 39 61111 Ljubljana Slovenia

This paper presents the most important issues of a real-time software package developed for the industrial multiloop controller MMC-90. MMC-90 is a biprocessor system based on the concept of a two-level controller. On the lower level of complexity, the base control processor performs the basic control functions. On the higher level of complexity, the flexible control coprocessor executes complex functions on request from the control tasks on the base control processor. All the software on the control coprocessor is written in Modula-2. The corresponding multitasking environment was designed as a set of Modula-2 libraries at various horizontal and vertical decomposition levels. On the control coprocessor a preemptive, priority based scheduler as well as a high level interprocess communication and synchronization mechanism has been developed. Communication between the processors is realized by means of a fast bi-directional communication channel, which is implemented via dual-port RAM. The developed system opens the door to applications of modem control algorithms in industrial practice.

关键词： REAL-TIME PROGRAMMING LANGUAGES MODULA-2 SOFTWARE DESIGN MICROPROCESSOR control

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