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Expert control and fault diagnosis of the leaching process in zinc hydrometallurgy plant *

IFAC Proceedings Volumes 2000年第22期33卷 335-340页

作者： Min Wu Jin-Hua She Michio Nakano Weihua Gui Department of Automatic Control Engineering Central South University of Technology Changsha 410083 China Mechatronics Department Tokyo University of Engineering Tokyo 192-0982 Japan Department of Mechanical System Engineering Takushoku University Tokyo 193-8585 Japan

This paper concerns a real-world application of an expert system to the automation of a zinc hydrometallurgy plant. The leaching process in zinc hydrometallurgy involves dissolving zinc-bearing material in dilute sulfuric acid to form a zinc sulfate solution. The key problems are to determine and track the optimal pHs of the overflows from the neutral and acid leaches, and to ensure the safe running of the process. This paper describes an expert control and fault diagnosis scheme that solves those problems. The expert control is based on a combination of steady-state mathematical models and rule models, and the fault diagnosis employs rule models with certainty factors and a Bayes representation. A real-world application of this scheme showed that it not only improved the control performance, but also correctly diagnosed faults.

关键词： zinc hydrometallurgy leaching process expert control fault diagnosis mathematical models rule models

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Adaptive control on manifolds of nonlinear control plants with complex and oscillation dynamics

Adaptive control on manifolds of nonlinear control plants wi...

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International Conference on control of Oscillations and Chaos

作者： V.A. Terekhov I.Y. Tyukin Department of Automatic and Control Processes Saint Petersburg State Electrical Engineering University LETI Saint Petersburg Russia Powertrain Control System Dept Ford Research Laboratory Dearborn USA

This work deals with the developing of Adaptive control on Manifolds algorithms (ACM) designed for the accompanying quality functionals in their general form. Our point here is to apply the ACM approach and to introduce some practice restrictions for the nonlinear control plants in the case of the quadratic accompanying functionals (QAF). In this article framework we analyze the applicability conditions of designed algorithms and illustrate received results for the problem of adaptive control of combustion engine crankshaft rotation speed.

关键词： Adaptive control State-space methods control systems Algorithm design and analysis Manifolds automatic control Nonlinear dynamical systems Process control Laboratories Mechanical power transmission

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Identification of Aircraft Gas-Turbine Dynamics using B-splines Neural Networks

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IFAC Proceedings Volumes 2000年第6期33卷 123-128页

作者： J.C. Lopes A.E. Ruano P.J. Fleming Unidade de Ciências Exactas e Humanas Universidade do Algarve Campus de Gambelas 8000 Faro Portugal Institute of System & Robotics Portugal Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

This paper describes preliminary results regarding the development of a B- splines neural network model of the fuel feed to shaft-speed dynamics of a twin-shaft gas turbine engine. Data recorded from practical testing of the turbine to a multisine input were employed, and models were identified at different points along the turbine operating curve. B-splines neural networks have been found to be good models of the system, delivering good results especially for long-range predictions.

关键词： Gas Turbines systems Identification Neural Networks

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ILM-river - A general design tool for simulation and control of rivers and hydropower plants

ILM-river - A general design tool for simulation and control...

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1999 European control Conference, ECC 1999

作者： Rauschenbach, Thomas Wernstedt, Jurgen University of Technology Ilmenau Institute for Automatic Control and System Engineering P.O. 10 05 65 IlmenauD-98684 Germany

ISBN: (纸本)9783952417355

ILM-RIVER is a universal tool for the task of the simulation and the control of rivers and cascades of hydropower plants. The tool consists of two libraries. One for modeling rivers and reservoirs, a second for the control of individual hydropower plants or cascades of hydropower plants. The libraries contain modules which can be associated with each other. The parameter estimation of the modules is left to the user. © 1999 EUCA.

关键词： Rivers

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Adaptive majority voter: A novel voting algorithm for real-time fault-tolerant control systems

Adaptive majority voter: A novel voting algorithm for real-t...

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25th EUROMICRO Conference on Informatics: Theory and Practice for the New Millennium, EUROMICRO 1999

作者： Latif-Shabgahi, G. Bennett, S. Department of Automatic Control and System Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom

ISBN: (纸本)0769503217

Voting algorithms have been widely used in the realisation of fault-tolerant systems. We introduce a new algorithm of software voting termed as adaptive majority voter. It uses the history of modules of a N-Modular Redundant (NMR) system to select the result of the most reliable module if it contributes toward a majority consensus. Furthermore, a new method for on-line creation of a history record of modules in a Triple Modular Redundant, TMR, system is proposed. The history vector of modules are not only used to improve the behaviour of a wide range of traditional voters, but also can be used to identify the most erroneous/faulty modules of a system to take appropriate reconfiguration or damage preventive strategies. The empirical results show that the novel 'adaptive majority voter' has higher safety and availability levels than the traditional majority voter. © 1999 IEEE.

关键词： Fault tolerance

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Correlation methods of continuous-time state-space model identification

Correlation methods of continuous-time state-space model ide...

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1999 European control Conference, ECC 1999

作者： Johansson, Rolf Verhaegen, Michel Haverkamp, Bert R. J. Chou, Chun Tung Department of Automatic Control Lund Institute of Technology Lund University PO Box 118 LundS-221 00 Sweden Department of Electrical Engineering System and Control Engineering Group TU Delft GA DelftNL-2600 Netherlands

This paper presents theory, algorithms and validation results for system identification of continuous-time state-space models from finite input-output sequences. The algorithms developed are methods of subspace model ... 详细信息

ISBN: (纸本)9783952417355

关键词： Correlation methods

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Adaptive majority voter: a novel voting algorithm for real-time fault-tolerant control systems

Adaptive majority voter: a novel voting algorithm for real-t...

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EUROMICRO Conference

作者： G. Latif-Shabgahi S. Bennett Department of Automatic Control and System Engineering University of Sheffield Sheffield UK

关键词： Programmable control Adaptive control Voting Real time systems Fault tolerant systems control systems History automatic control systems engineering and theory Testing

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Needs of object-oriented languages for physics knowledge representation in the simulation field

Needs of object-oriented languages for physics knowledge rep...

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Technology of Object-Oriented Languages and systems (TOOLS)

作者： J.J. Ramos M.A. Piera Department of System Engineering and Automatic Control Universidad Autònoma de Barcelona Spain

To cope with the growing demands for simulation models of ever increasing complex industrial systems, the research community effort has been mainly focused on creating different software tools which simplify the modelling task. There is a recognised necessity of modelling tools supporting libraries of non-causal models which could be coupled in the same way as physical units are assembled in a system. This work presents an object-oriented modelling language, PML, designed to support a modelling methodology where system models are described by linking system component models analogously as the system components are linked. This modelling language introduces a new modularization of physical knowledge, making a clear separation between the physical behaviour representation (declarative knowledge) and the computational aspects of model simulation (procedural knowledge).

关键词： Physics Knowledge representation Object oriented modeling Power system modeling Software tools Computational modeling Computer industry Software libraries Equations systems engineering and theory

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An expert control strategy using neural networks for the electrolytic process in zinc hydrometallurgy

An expert control strategy using neural networks for the ele...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Min Wu Michio Nakano Jin-Hua Shexx Department of Automatic Control Engineering Central South University of Technology Changsha China Department of Mechanical System Engineering Tokushoku University Tokyo Japan

The final step in zinc hydrometallurgy is the electrolytic process. The most important parameters to control the the concentrations of zinc and sulfuric acid in the electrolyte. This paper proposes an expert control strategy for determining and tracking the optimal concentrations, which uses neural networks, rule models and a single-loop control scheme. First, the process is described and the strategy that features an expert controller and three single-loop controllers is explained. Next, neural networks and rule models are constructed based on statistical data and empirical knowledge on the process. Then, the expert controller for determining the optimal concentrations is designed through a combination of the neural networks and rule models. The three single-loop controllers use the PI algorithm to track the optimal concentrations. Finally, the results of actual runs using the strategy are presented. They show that the strategy provides not only high-purity metallic zinc, but also significant economic benefits.

关键词： Neural networks Intelligent networks Zinc Process control Electrochemical processes Expert systems control systems Cathodes Power engineering and energy Chemical processes

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ILM-river — A general design tool for simulation and control of rivers and hydropower plants

ILM-river — A general design tool for simulation and contro...

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European control Conference (ECC)

作者： Thomas Rauschenbach Jürgen Wernstedt University of Technology Ilmenau Institute for Automatic Control and System Engineering P.O. 10 05 65 D-98684 Ilmenau

关键词： Reservoirs Rivers Floods Libraries Computational modeling Hydroelectric power generation Mathematical model

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