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Experiences in control system design of Phosphate Ore Grinding in Siilinjărvi Concentrator

IFAC Proceedings Volumes 1987年第8期20卷 167-174页

作者： S.L. Jämsä J. Aaltonen Kemira Engineering Finland Kemira Oy Finland

The multivariable control that was designed for the grinding circuit in the Siilinjärvi concentrator can control important variables like the final particle size and the density of the cyclone feed. The controller was designed for the plant using an interactive CACSD software package which included the use of the inverse Nyquist array method. The control algorithms designed were implemented in the process control computer at Siilinjärvi and the correlation between the simulated results and the full scale tests in short term experiments was good. Changes in the setpoint of either of the controlled output variables produced satisfactory responses, while at the same time the other controlled output remained close to the designed constant value. The multivariable controller designed has not yet been taken into continuous use at Siilinjärvi. The large variation of mineral components in the ore has caused difficulties in the operation of the particle size analyser. The potential use of the PSM analyser for on-line control in the Siilinjärvi grinding process is discussed in the paper.

关键词： Multivariable control systems Inverse Nyquist Array method computer-aided control system design Phosphate ore grinding

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Accelerating Multi-Objective control system design Using a Neuro-Genetic Approach

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IFAC Proceedings Volumes 2000年第24期33卷 87-92页

作者： N.M. Duarte A.E. Ruano C.M. Fonseca Bernd Mahn Unit of Exact Sciences & Humanities University of Algarve Portugal Department ofAutomatic Control and Systems Engineering University of Sheffield Sheffield UK

designing control systems using multiobjective genetic algorithms can lead to a substantial computational load as a result of the repeated evaluation of the multiple objectives and the population-based nature of the search. Here, a neural network approach, based on radial basis functions, is introduced to alleviate this problem by providing computationally inexpensive estimates of objective values during the search. A straightforward example demonstrates the utility of the approach.

关键词： multiobjective optimisation genetic algorithms computer-aided control system design

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EDF steam generator benchmark: The partial state reference model control approach

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IFAC Proceedings Volumes 1999年第2期32卷 3605-3610页

作者： P. Tona M. M'Saad Laboratoire d'Automatique de Grenoble INPG-CNRS ENSIEG B.P. 46 38402 Saint Martin d'Hères France Laboratoire d'Automatique de Procédé ISMRA 6 boulevard Maréchal Juin 14050 Caen France

This paper presents a robust predictive control approach to a benchmark problem involving water level control in the steam generator of a nuclear power reactor. control design is performed using a sensitivity function shaping procedure which broadly borrows from the robust control culture. Of fundamental interest, the control design model is obtained using an experimental identification approach developed from established results in system identification.

关键词： Steam generators Benchmark examples Predictive control Sensitivity functions Robustness Identification computer-aided control system design

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An Integrated Software Environment for design and Real-Time Implementation of control systems

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IFAC Proceedings Volumes 1997年第11期30卷 1523-1528页

作者： Masanobu Koga Hiroaki Toriumi Mitsuji Sampei Department of Mechanical and Environmental Informatics Tokyo Institute of Technology 2-12-1 Oh-okayama Meguro-ku Tokyo 152 JAPAN Tel +81-3-5734-2328 Fax +81-3-5734-2328

In this paper development of a CAD of control systems is introduced which enables us to do not only analysis of control systems, design of controllers but also real-time implementation of controllers. By utilizing this software, the control engineer is able to repeat the procedure of modification of controllers and experiments without recompile to attain better performance. The software also offers the facility to update the parameters of controllers without stopping real-time control, which helps on-line tuning of controllers. If some parameters of the controller is changed on-line, the control input may change discontinuously. It has serious effect on the control systems. A method for on-line tuning of state feedback controller with state observer is proposed and verified through the experiment with an inverted pendulum.

关键词： computer-aided control system design Real-time systems Simulation

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The QFT control design Toolbox for MATLAB

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IFAC Proceedings Volumes 1997年第16期30卷 103-108页

作者： Oded Yaniv Yossi Chait Craig Borghesani EE-Systems Dept. Tel Aviv University Tel Aviv 69978 ISRAEL MIE Dept. UMass Amherst MA 01003 USA Terasoft Inc. 1986 Commonwealth Ave. Boston MA 02135 USA

The QFT control design Toolbox version 1 (formerly The Quantitative Feedback Theory Toolbox) has been available commercially since 1995 (Borghesani, et al., 1995). The toolbox includes a complete collection of MATLAB functions, compatible with 4.2, for designing single-loop robust feedback systems in the spirit of QFT. Version 1.0.1, essentially unchanged, has been upgraded to work with MATLAB 5. In this paper, we discuss possible upgrades for future versions including generalization to multi-loop setting, automatic loop shaping and implementation of new results that improve efficiency of bound computations.

关键词： computer-aided control system design Robust control

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Combustion Engine Air Intake Theoretical Modelling, Model-Verfication & Application to Optimal Valve Actuation

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IFAC Proceedings Volumes 2012年第2期45卷 171-176页

作者： S. Studener ITK Engineering AG Lochhamer Straße 15 D-82152 Martinsried Germany

Abstract A theoretical model for the air intake of a four stroke internal combustion engine is derived from first principles, the conservation of mass and the conservation of energy. Full valve actuation is taken into account: The opening angle of both the intake as well as the exhaust valve, as well as the variable valve lift are considered as plant inputs, which may be manipulated to maximize the air intake rate and hence the power, the engine delivers. The theoretical model is verified by comparing the model output to steady state data collected at an engine test bench. Therefor a formal connection between state-of-the-art mean value models and the crank angle resolved physical model must be established. The pressure loss in the intake valve is considered a disturbance of the ideal cylinder filling dynamics, which is estimated using non-linear optimization techniques. The intended purpose of physical model building for the cylinder air intake is prediction of the air intake rate and computation of optimal valve control action before a lot of effort is put into a real experiment at the engine test bench. A significant reduction of operating time and cost consumed by the real engine test bench can be achieved, if a small subset of steady state measurements are used to compute a meta-model for the pressure loss. The combination of the black-box pressure loss model and the air intake model allows for prediction of the air intake rate at unknown operating points of the engine with sufficient accuracy.

关键词： Automotive control computer-aided control system design engine modelling engine control

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A User Friendly Toolbox for the Analysis of Interval systems

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IFAC Proceedings Volumes 2000年第14期33卷 501-506页

作者： Nusret Tan Derek P. Atherton Inonu University Engineering Faculty Department of Electrical and Electronics Engineering 44100 Malatya Turkey School of Engineering University of Sussex Falmer Brighton BN1 9QT UK

Most of the methods which are used for the analysis and design of systems with parametric uncertainty require extensive computations. Therefore, it is value to develop computer programs which enable one to deal with uncertain systems in an easy way. This paper describes a user friendly software package(AISTK-Analysis of Interval systems Toolkit). Algorithms have been developed in the MATLAB environment by using the Kharitonov theorem and related approaches. The objective in developing AISTK was to gather these algorithms under a toolkit and make them easily usable by students or other users.

关键词： Uncertain linear systems Robust control computer-aided control system design Kharitonov theorem Parametric variation

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A Prototype Development Framework for Hybrid control system design

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IFAC Proceedings Volumes 1996年第1期29卷 7296-7301页

作者： M.S. Hajji A.R. Browne J.M. Bass P. Schroder P.R. Croll P.J. Fleming Dept. of Automatic Control and Systems Engineering University of Sheffield UK. Dept. of Computer Science University of Sheffield UK. Tel: +44-114-282-5236 Fax: +44-114-273-1729

Hybrid control systems are a combination of real-time control law and discrete-state logic. This paper describes how a Development Framework for control systems software has been adapted so that it may also handle discrete events such as mode switching. The Framework provides a highly automated path from a control engineering specification to a distributed system implementation. Simulink, an extension to Matlab, is used to specify control laws, and a statecharts tool, Statemate, is used to specify and model discrete-state components. The design phase of the Development Framework supports the integration of the two sets of specification. An inverted pendulum control system is introduced as a simple example of a hybrid system implemented using the Framework. The translation of statecharts to dataflow notations is described for the example system. General translation rules are also presented.

关键词： Real-time systems parallel processing computer-aided control system design discrete-event systems

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Interactive control system design

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IFAC Proceedings Volumes 2003年第10期36卷 333-338页

作者： J.P. Keller Institute of Automation University of Applied Science Solothurn Bittertenstr. 15 4702 Oensingen Switzerland

This contribution describes a LabVIEW based interactive computer aided control system design tool. It offers a set of ready to use solutions of typical control system design problems. Instead of a syntax a menu driven user interface with convenient system editors and analysis tools enables the user to interactively attain the design goals. The tool allows the student to efficiently do the control system design from plant identification to controller implementation on the same platform.

关键词： computer-aided control system design Interactive programs User interfaces Educational aids Identification LQG control Implementation

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design of Uncertain Nonlinear Feedback systems with Inputs and Outputs Satisfying Bounding Conditions

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IFAC Proceedings Volumes 2011年第1期44卷 10970-10975页

作者： Mai Van Sy Suchin Arunsawatwong Eyad H. Abed Department of Electrical Engineering Chulalongkorn University Bangkok 10330 Thailand Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 USA

Abstract This paper develops a computational method for designing a feedback control system where the plant is an uncertain linear time-invariant convolution subsystem with a static memoryless input nonlinearity. The main design objective is to determine a controller ensuring that the error and the controller output are always within respective bounds for all uncertainties and for all inputs having bounded magnitude and slope. First, using Schauder fixed point theorem, we show that (if exists) a design solution for an uncertain linear system obtained by replacing the nonlinearity with a gain and a bounded disturbance is also a solution for the original problem. Then, by extending a known theory and applying it to the so-obtained linear problem, we derive design inequalities that can readily be solved in practice. The usefulness of the developed method is illustrated by a design example of an uncertain heat-conduction process.

关键词： Nonlinear control systems computer-aided control system design robust control uncertain dynamical systems distributed-parameter systems Popov criterion

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