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Combining First Principles with Black-Box Techniques for Reaction Systems

IFAC Proceedings Volumes 2000年第15期33卷 427-432页

作者： Libei Chen Yves Hontoir Dexian Huang Jie Zhang A. Julian Morris Centre for Systems Engineering and Applied Mechanics Catholic University of Louvain Belgium SOLVAY Advanced Process Control Chemicals Corporate Research and Technology Brussels Belgium Department of Chemical and Process Engineering The University of Newcastle-upone-Tyne UK Department of Automation Tsinghua University Beijing China

A control oriented hybrid model structure combining first principles models with standard black-box techniques for modelling nonlinear dynamics of reaction systems is presented in this paper. The approach is formulated in a general framework for continuous stirred tank reactors and analyzed in details through a case study of a reactive distillation column. The approach is based on easily established mass balance equations, the stoichiometry of the system as well as model reduction techniques. The choice of combined inputs and the model structure is motivated by some general control objectives for this class of systems. A progressive identification of this model structure can be performed when a dominant part exists. The application to real process data is presented. This model structure has been successfully used in an IMC scheme for an industrial reactive distillation column.

关键词： Hybrid modelling neural networks process optimization reaction systems reactive distillation column

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Modeling and simulation of EAF melt shop

Modeling and simulation of EAF melt shop

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American control Conference (ACC)

作者： A.T. Tzanev A.W. Ordys M.V. Tzaneva Department Process Control and Industrial Automation University of Chemical Technology and Metallurgy-Sofia Sofia Bulgaria Industrial Control Centre University of Strathclyde Glasgow UK Department Informatics University of National and World Economy Sofia Bulgaria

The paper describes modelling and simulation of electric arc furnace (EAF) melting shop. This is a batch process and can be classified as a hybrid system in which discrete events such as material transportation operations and sequencing of the power supply to the furnace are combined with the continuous time melting of steel. The continuous part of the system is described by a nonlinear dynamic model. The discrete event part of the system is described by decision rules. The object oriented approach to the task of building the simulation model is outlined, and the specific requirements for the EAF melt shop problem are determined. Examples of using the simulation for solving problems in managing the furnace melt shop are presented.

关键词： Temperature Heat transfer Furnaces Electrodes Heating Steel Continuous production Iron Power system interconnection Boundary conditions

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control of the Bouncing Ball Laboratory Experiment with an Allen-Bradley PLC

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IFAC Proceedings Volumes 2000年第31期33卷 105-110页

作者： B. Hrúz K.-I. Kopčok Š. Kozák H.P. Jörgl Department of Automatic Control Systems Slovak Technical University Ilkovicova 3 SK-81219 Bratislava Slovakia Tel: +421 7 60291698 Institute for Machine and Process Automation Vienna University of Technology Gußhausstraße 27-29 A-l040 Vienna Austria Tel. +43 1 ***

This paper describes a mechanical system with a bouncing ball, it’s parameters, mathematical model and control design process using a programmable logic controller. This system is very good object for the demonstration of discrete event control and illustration of the possibilities and constraints of programmable logic controllers.

关键词： Petri-nets Programmable logic controllers Mechanical system Discrete-event system

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Model-based fault diagnosis of an actuator system driven by the brushless DC motor

Model-based fault diagnosis of an actuator system driven by ...

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American control Conference (ACC)

作者： O. Moseler D. Juricic A. Rakar N. Muller Institute of Automatic Control Laboratory of Control Engineering and Process Automation Darmstadt University of Technology Darmstadt Germany Department of Computer Automation and Control Jozef Stefan Institute Ljubljana Slovenia

A fault detection and isolation scheme for a brushless DC motor driving a mechanical actuation system is presented. First, a detailed mathematical model of the drive is derived. The residual generator is based on parity relations while the fault isolation part is implemented by means of the transferable belief model. The problem of distinguishing between faults with the same fault signatures is addressed. It is shown that additional improvements in terms of resolution can be achieved by employing parameter estimation. The proposed FDI scheme is tested on the actual drive under various faults. The achieved performance features the highest resolution, diagnostic stability and accuracy.

关键词： Fault diagnosis Actuators Brushless DC motors DC motors Coils Rotors Stators Fault detection Pulse width modulation Mathematical model

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Effects of Rotation Speed and Scrapers Mounting Gap on the Cumulative Capacity of Ceramic Disk Filters

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IFAC Proceedings Volumes 1999年第2期32卷 7010-7015页

作者： V. Kanninen Helsinki University of Technology Department of Chemical Technology Laboratory of Process Control and Automation Kemistintie 1 P.O. Box 6100 FIN-02015 HUT Finland Fax +358-9-4513854

Cumulative capacity of ceramic rotating disk filters cannot be calculated using only steady-state capacity models, because the basin slurry density can undergo slow dynamic changes even if the feed slurry density remains constant. In this article, dynamic models are used to study the effects of slurry density changes on the cumulative capacity of a ceramic rotating disk filter. Simulation runs are used specifically to determine the effect of drum rotation speed and the effect of mounting gap length of filter cake scrapers on the cumulative capacity. The results of the simulations show that selecting of optimal rotation speed based on short period plant tests will not maximize the cumulative capacity. Usually maximum cumulative capacity is reached at clearly higher rotation speeds than maximum momentary capacity.

关键词： Ceramic rotating disk filters dynamic modeling and simulation

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Decentralized stabilization of interconnected time-delay systems

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IFAC Proceedings Volumes 1999年第2期32卷 1655-1660页

作者： Li Yu Anke Xue Yurong Nan Jian Chu Department of Automation Zhejiang University of Technology Hangzhou 310032 P. R. China Institute of Industrial Process Control Zhejiang University Hangzhou 310027 P. R. China

We consider the general decentralized stabilization problem of linear time-invariant, large-scale systems with delay interconnections. A sufficient condition for the stabilizability via a decentralized state feedback control law is derived, it is shown that this condition is equivalent to the existence of positive definite symmetric matrix solutions to a system of (parameters-dependent) Riccati equations at the subsystem level. Also, a construction for the decentralized stabilizing control law is given in terms of the solutions to the Riccati equations. A example is given to illustrate the proposed method, and a comparison with the existing methods is made.

关键词： Decentralized control state feedback stabilization interconnected systems delay

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Analytical design for linear continuous integrator/time delay systems

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IFAC Proceedings Volumes 1999年第2期32卷 2967-2971页

作者： Weidong Zhang Xiaoming Xu Youxian Sun Department of Automation Shanghai Jiaotong University Shanghai 200030 P. R. China National Laboratory of Industrial Control Technology Institute of Industrial Process Control of Zhejiang University Hangzhou 310027 P. R. China

Smith predictor has been proved to be a useful scheme for stable processes with time delay. In this paper an analytical design method of Smith predictor is presented for integrator/time delay processes based on the theory of complex function. The design procedure incorporates a two-stage procedure. In the first stage, the controller that stabilizes the closed loop system is parameterized. In the second stage, high enough order Pade approximation is introduced to approximate the time delay, and convert the design problem of system with time delay to that of system without time delay. The optimal Smith predictor is then derived analytically. Examples are given to illustrate the method.

关键词： Optimal control Smith predictor integrator/time delay process process control

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Fault Diagnosis System for the Outokumpu Flash Smelting process

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IFAC Proceedings Volumes 1999年第2期32卷 7028-7033页

作者： E. Vapaavuori S-L. Jämsä-Jounela J. Yianatos Laboratory of Process Control and Automation Helsinki University of Technology P.O.Box 6100 FIN-02015 HUT Finland Chemical Engineering Department Santa Maria University P.O.Box 110-V Valparaiso Chile

Fault diagnosis systems have attracted the growing interest of researchers in a number of engineering areas. The number of applications has increased and successful results are reported widely. This paper presents the results of principal component analysis carried out on the Outokumpu flash smelting process the waste heat boiler being analysed in more detail. The PCA results are evaluated and the configuration of a fault diagnosis system is proposed.

关键词： Fault detection fault diagnosis principle component analysis flash smelting

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Technical note Hybrid fuzzy P+ID control of manipulators under uncertainty

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Mechatronics 1999年第3期9卷 301-315页

作者： W. Li X.G. Chang F.M. Wahl S.K. Tso Department of Computer Science and Technology Tsinghua University Beijing 100084 Peoples Republic of China Institute for Robotics and Process Control Technical University of Braunschweig Hamburger Str. 267 D-38114 Braunschweig Germany Center for Intelligent Design Manufacturing and Automation Department of Manufacturing Engineering and Engineering Management City University of Hong Kong Hong KongPeoples Republic ofChina

Currently, most commercial robot manipulators are equipped with conventional PID controllers due to their simplicity in structure and ease of design. Using such a controller, however, it is difficult to achieve a desired control performance since the dynamic equations of a mechanical manipulator are tightly coupled. In addition, they are highly nonlinear and uncertain. This paper uses a new hybrid control scheme to control a direct drive two-link manipulator under inertial parameters changes. The proposed hybrid control scheme consists of a fuzzy logic proportional controller and a conventional integral and derivative controller (FUZZY P+ID). In comparison with a conventional PID controller, only one additional parameter has to be adjusted to tune the FUZZY P+ID controller. The outlined experimental results demonstrate the effectiveness and the robustness of the new FUZZY P+ID controller.

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Optimal On-Line Timing of Washing Periods in Ceramic Rotating Disk Filters

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IFAC Proceedings Volumes 1998年第23期31卷 339-344页

作者： V. Kanninen Helsinki University of Technology Department of Chemical Technology Laboratory of Process Control and Automation Kemistintie 1 FIN-02150 Espoo Finland

A novel method for optimal on-line timing of washing periods in ceramic disk filters has been developed. This method called the imaginary average capacity trend method, is based on the use of an on-line ceramic filter model and process trend history data to estimate on-line optimal timing for the next washing period. The most important advantage of this method is its ability to generate satisfactory estimates for the optimal timing of washing periods in situations where the operating variables of the filter and/or properties of the feed slurry change dynamically during the operation period. In typical plant operation of ceramic disk filters, operation parameters are changed rather seldom, but feed slurry density can undergo large changes during an operation period. The principles of the developed on-line calculation method can also be applied to processes other than ceramic rotating disk filters.

关键词： Optimization Cerarruc disk filters Modeling On-line support systems

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