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HIFOO - A MATLAB PACKAGE FOR FIXED-ORDER controlLER design AND H ∞ OPTIMIZATION

IFAC Proceedings Volumes 2006年第9期39卷 339-344页

作者： J.V. Burke D. Henrion A.S. Lewis M.L. Overton Department of Mathematics University of Washington Seattle WA 98195 USA LAAS-CNRS 7 Avenue du Colonel Roche 31077 Toulouse France and Department of Control Engineering Faculty of Electrical Engineering Czech Technical University in Prague Technická 2 16627 Prague Czech Republic School of Operations Research and Industrial Engineering Cornell University Ithaca NY 14853 USA Courant Institute of Mathematical Sciences New York University New York NY 10012 USA

H ∞ controller design for linear systems is a difficult, nonconvex and typically nonsmooth (nondifferentiable) optimization problem when the order of the controller is fixed to be less than that of the open-loop plant, a typical requirement in e.g. embedded aerospace control systems. In this paper we describe a new MATLAB package called HIFOO, aimed at solving fixed-order stabilization and local optimization problems. It depends on a new hybrid algorithm for nonsmooth, nonconvex optimization based on several techniques, namely quasi-Newton updating, bundling and gradient sampling. The user may request HIFOO to optimize one of several objectives, including H ∞ norm, which requires either the control system Toolbox for MATLAB or, for much better performance, the linorm function in the SLICOT package. No other external package is required, but the quadratic programming code quadprog from either MOSEK or the Optimization Toolbox for MATLAB is recommended. Numerical experiments on benchmark problem instances from the COMPl e ib database indicate that HIFOO could be an efficient and reliable computer-aided control system design (CACSD) tool, with a potential for realistic industrial applications.

关键词： Fixed-order controller design H ∞ control Nonconvex Optimization Nonsmooth Optimization computer-aided control system design

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Interactive Optimization-Based design Software for Rotorcraft Flight control systems

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IFAC Proceedings Volumes 1996年第1期29卷 1866-1871页

作者： Chujen Lin Mark B. Tischler William S. Levine Senior Scientist Intelligent Automation Inc. 2 Research Place suite 202 Rockville MD 20850 Army Rotorcraft Group Leader U. S. Army Aeroflightdynamics Directorate Aviation and Troop Command Member AIAA Professor Department of Electrical Engineering and Institute for Systems Research University of Maryland at College Park MD 20742.

A specialized software package, known as GIFCORCODE, has been developed to aid the designer of rotorcraft flight control systems. GIFCORCODE is based on CONSOL-OPTCAD (C-O), a software package that implements a design methodology based on multicriterion, parametric optimization. GIFCORCODE includes SIMULINK ® and MATLAB ® files for evaluating a design's performance, defined by the Airworthiness design Standard for military rotorcraft (ADS-33C). GIFCORCODE also includes a generalized user interface that allows the designer to interact with C-O by means of pull-down menus and graphical displays. GIFCORCODE has been used in the design of flight control systems for the UH-60A RASCAL helicopter.

关键词： design Helicopter control Software computer-aided control system design Optimization

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Network-based software-in-the-loop simulation for real-time control system

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IFAC Proceedings Volumes 1999年第2期32卷 6047-6052页

作者： Wook Hyun Kwon Seong-Gyu Choi Ki Baek Kim School of Electrical Engr. Seoul Nat'l. Univ. Seoul 151-742 Korea Fax +82-2-871-7010

This paper suggests a real-time implementation method for software-in-the-loop (SIL) simulation for control systems. The implementation is composed of a PC for the controllers, a PC for the plant, a general-purpose computer-aided control system design (CACSD)package, and an Ethernet network. The Ethernet network is investigated in terms of control issues such as sampling interval, network-induced time delay, use with multiple I/O points and data synchronization. A performance evaluation of software-in-the-loop simulation is carried out subject to a computation delay and a sampling interval. To reduce the effects of the time delay, particularly for fast plants, a time-scaling method is introduced for slow and fast motions. It is demonstrated that this real-time software-in-the-loop simulation will be very useful.

关键词： Software-In-the-Loop (STL) Simulation computer-aided control system design Ethernet Time-Scaling

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Object-Oriented Modelling of Power Plants: a Structured Approach

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IFAC Proceedings Volumes 2009年第9期42卷 249-254页

作者： Francesco Casella Politecnico di Milano Dipartimento di Elettronica e Informazione 20133 Milano ITALY

Object-oriented modelling languages have become in recent years a very attractive choice for the control-oriented, dynamic modelling of power plants, due to their ease of development, flexibility, and reusability features. The paper describes a hierarchical modelling framework for thermal power plants, based on the Modelica language and on an existing library of elementary models, with particular emphasis on combined-cycle plants. The design criteria of the framework are discussed, and demonstrated by examples. The implications for the modelling of advanced power plants of the future, such as IGCC plants, integrated fuel-cell and combined cycle plants, and plants with CO 2 capture capabilities are finally discussed.

关键词： Power plant modelling object-oriented modelling computer-aided control system design

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Modified Depth First Search for State-Space Representation of Block Diagrams

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IFAC Proceedings Volumes 2000年第24期33卷 63-68页

作者： M. Bacic R.W. Daniel Oxford University Department of Engineering Science Parks Road Oxford OX1 3PJ

A new graph pruning algorithm is presented that overcomes some the difficulties of depth first search when building a state-space description of an inputoutput model prior to control system analysis. The algorithm is suitable for manipulating state-space models directly without transformation into the Laplace domain and overcomes some the numerical problems associated with existing techniques. The approach is particularly relevant to Web-based control system design.

关键词： Algorithms Block diagrams computer-aided control system design

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An Overview of control Theory Applicable to Process Industries

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IFAC Proceedings Volumes 1986年第1期19卷 1-5页

作者： J.B. Cruz K. Poolla University of Illinois Urbana Illinois USA

In this paper we present an overview of some recent trends and results in selected topics in control theory which are deemed to have most relevance to the control of processes which are commonly used in the petroleum, petrochemical, and desalination industries. Judicious approximations and simplifications are commonplace, so that the resulting mathematical models for the processes necessarily involve idealizations leading to discrepancies between the real systems and the models. These processes are usually distributed in nature so that partial differential equations are more appropriate than ordinary differential equations to describe them. Finally, the computation of controls are usually computer-aided by necessity. We give an overview of recent results on the synthesis of robust controllers for linear time-invariant *** we given an overview of several methods for the control of distributed parameter systems. Finally we briefly describe some trends in computer-aided design and engineering relevant to process control.

关键词： robustness distributed parameter systems computer-aided control system design

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An Innovative Advance in Conducting Experiments Â€” Virtual Laboratories in The National University

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IFAC Proceedings Volumes 2000年第31期33卷 379-383页

作者： C.C. Ko Ben M. Chen V. Ramakrishnan Y. Zhuang S.Y. Hu J.P. Chen Department of Electrical and Computer Engineering The National University of Singapore 10 Kent Ridge Crescent Singapore 117576

In this article, we present an overview on the web-based virtual laboratories currently available in the Department of Electrical and computer Engineering, NUS (National University of Singapore). Two pilot web-based virtual laboratories have been developed and launched in the Faculty of Engineering at NUS. One laboratory is on an oscilloscope experiment and is aimed to serve over 1000 first year undergraduate engineering students in the Faculty. The other is on the control of a coupled-tank system and with the capability to implement and test various control strategies, is developed for both teaching and research. Rather than simulating what was happening in the real world on the client as is often done in other virtual laboratories, the system developed makes use of real time video and audio capture of actual instrument and apparatus. In addition, the use of the mouse to turn the control buttons and knobs of the instruments has been implemented so that a more realistic feel of the instrument is provided. The launch of the virtual laboratory on the oscilloscope experiment in early March 1999 has created a lot of interests, with numerous user feedback and comments received. Both laboratories can be accessed at http://***/vlab .

关键词： Coupled-tank system Oscilloscope PID Fuzzy and state space control computer-aided control system design

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PREDCON: A Package for Multiobjective controller design 1

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IFAC Proceedings Volumes 1997年第21期30卷 55-59页

作者： A.S. Rykov I.I. Vinogradova A.G. Kuznetsov Faculty of Economics & Information Engineering Moscow Institute for Steel & Alloys Leninsky prosp. 4 117936 Moscow Russia Department of Engineering Science Oxford University Parks Road Oxford OX1 3PJ United Kingdom

The package PREDCON offers facilities for dialogue-based control system design. It is developed in the form of a MATLAB toolbox and is based on optimisation methods proposed by the authors. The package is applicable for tuning parameters of various types of controller. It is particularly suitable for research and teaching control theory.

关键词： computer-aided control system design multiobjective optimisation dialogue methods

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On Flexible CAD of Adaptive control and Identification Algorithms

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IFAC Proceedings Volumes 1988年第8期21卷 243-246页

作者： A. Christensen O. Ravn Servolaboratory Building 326 Technical University of Denmark DK-2800 Lyngby Denmark

SLLAB is a MATLAB-family software package for solving control and identification problems. This paper concerns the planning of a general-purpose subroutine structure for solving identification and Adaptive control problems. A general-purpose identification algorithm is suggested, which allows a total redesign of the system within each sample. The necessary design parameters are evaluated and a decision vector is defined, from which the identification algorithm can be generated by the program. Using the decision vector, a decision-node tree structure is built up, where the nodes define a maximal subroutine structure for the problem. The extension of the system for solving Adaptive control problems is considered.

关键词： Identification Adaptive control control systems design analysis control system synthesis computer-aided control system design

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PC-Based CAE Platform for Fuzzy control system design

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IFAC Proceedings Volumes 1995年第5期28卷 285-292页

作者： Qinqin Jiang Shaohua Tan Xuqiang Liao Hang. Chang-Chieh Ho-chung Lui Loonin Teow Mingkun Gu Department of Electrical Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 0511 Institute of Systems Science National University of Singapore Heng Mui Keng Terrace Kent Ridge Singapore 0511

A CAE (computer-aided-Engineering) hardware and software platform for designing fuzzy control system is presented in this paper. Capable of integrating all the four phases for the design, namely, tuning, simulation, prototyping and field test, the platform allows the whole design process to be cycled easily and efficiently, thus speeds up the control system design and prototyping considerably. The hardware architecture of the dedicated standalone controller is discussed. The software development is outlined.

关键词： computer-aided engineering computer-aided control system design Object-oriented programming Fuzzy control Membership function Rules Real-time Prototyping

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