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Slicot, A Subroutine Library in control and systems Theory

IFAC Proceedings Volumes 1991年第4期24卷 71-76页

作者： A. van den Boom A. Brown F. Dumortier A. Geurts S. Hammarling R. Kool M. Vanbegin P. Van Dooren S. Van Huffel Eindhoven University of Technology Eindhoven The Netherlands Numerical Algorithms Group (NAG) Ltd. Oxford UK State University of Ghent Ghent Belgium Philips Research Laboratory Belgium Louvain la Neuve Belgium Katholieke Universiteit Leuven Leuven Belgium

Past initiatives with respect to realising control libraries are analyzed. A new collaborative initiative is introduced. The design of a new control library SLICOT is presented and the first release of this library is... 详细信息

关键词： computer-aided control system design interactive computing control engineering computer applications control libraries

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Robust controller design for Feedback systems with Uncertain Backlash and Plant Uncertainties Subject to Inputs Satisfying Bounding Conditions

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IFAC Proceedings Volumes 2014年第3期47卷 1643-1648页

作者： Hoang Hai Nguyen Suchin Arunsawatwong Department of Electrical Engineering Chulalongkorn University Bangkok 10330 Thailand

This paper develops a method for designing unity feedback systems where an uncertain linear time-invariant (possibly distributed-parameter) plant is in cascade connection with an uncertain backlash and a controller. The design problem considered is to determine a robust controller so as to ensure that, despite plant uncertainties, the error and the controller output stay within prescribed bounds for all time and for all inputs whose magnitude and whose slope satisfy given bounding conditions. In essence, the backlash is replaced with a constant gain and a bounded disturbance, thereby resulting in an auxiliary uncertain linear system. Then, by applying the multi-valued version of the fixed-point theorem and the extended version of the theory of majorants, we derive a practical condition in the form of inequalities that can be solved in practice. Further we show that if such inequalities are satisfied for a chosen nominal system, then the original design problem is solved. The usefulness of the method is illustrated by a design example where the plant has a time-delay.

关键词： Robust control nonlinear systems backlash computer-aided control system design process control theory of majorants

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control Structure Selection Based on Linear Dynamic Economics - Multiloop PI Structures for Multiple Disturbances

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IFAC Proceedings Volumes 1996年第1期29卷 5882-5887页

作者： Jonathan Heath John Perkins Stephen Walsh Centre for Process Systems Engineering Imperial College of Science Technology and Medicine Prince Consort Road London SW7 2BY UK

Recently, progress has been made towards the systematic selection of control structure (i.e. placement of actuators and measurements and corresponding connections) using linear combinatorial optimisation techniques to minimise the economic impact of disturbances on the process economics. Perfect control is used in these techniques to obviate the need for variable pairing and controller tuning. However, there are significant limitations in perfect control analysis including, for example, the fact that the perfect controller is often not realisable. In this paper, an optmisation-based method is proposed to automatically select the best decentralised. PI-tuned control structure, thus replacing the perfect control assumption with realistic controller models. A case study on the application of the method is presented.

关键词： computer-aided control system design Decentralised control Disturbance rejection Combinatorial mathematics

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Heterogeneous architectures for real-time control: design tools and scheduling issues

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IFAC Proceedings Volumes 1994年第15期27卷 89-94页

作者： M.J. Baxter M.O. Tokhi P.J. Fleming Department of Automatic Control and Systems Engineering University of Sheffield P.O. Box 600 Mappin Street Sheffield S1 4DU U.K

Complex and computationally demanding algorithms are often employed to satisfy the performance requirements of modern control systems. Conventional uni-processor and homogeneous parallel architectures can not meet the performance requirements of these algorithms. A suitable solution maybe obtained with a computationally specialised heterogeneous architecture. This paper introduces the key issues associated with the development of this class of systems. followed by a description of a set of design tools used to automate the development. One of the most challenging aspects of the system development is the scheduling of tasks to processors. This paper will focus closely on this issue by discussing the results of a variety of scheduling heuristics used within the design tools.

关键词： Heterogeneous architectures Parallel processing Scheduling computer-aided control system design Real-time computer systems Digital signal processing

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A Digital control Kit for MATLAB

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IFAC Proceedings Volumes 1997年第12期30卷 59-64页

作者： A.J. Wilkinson Loh Sum Weng Department of Electrical and Electronic Engineering The Queen's University of Belfast BT7 1NN UK

This paper outlines the features of a toolkit which provides a user-friendly, graphical front-end to MATLAB for analysing and designing digital control systems. It is aimed particularly at educational applications in ... 详细信息

关键词： Direct digital control Simulation computer-aided control system design Educational aids SISO

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designing a Computation Environment for Analysing Piecewise Linear systems

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IFAC Proceedings Volumes 1995年第14期28卷 863-868页

作者： Njal B.O.L. Pettit Peter E. Wellstead Control Systems Centre UMIST P.O.Box 88 M60 IQD Manchester UK. Tel:+44 161 200 4668 Fax: +44 161 200 4647

Piecewise linear systems describe an important class of nonlinear systems. They are able to bring under one formulation both dynamic systems with piecewise nonlinearities (typically dead-zones and saturation) and logic control actions such as found in rule-based controllers and gain schedulers. Recent work has shown that a piecewise linear system can be mapped to a directed graph where information about the interaction of logic and dynamics are preserved. However only low order systems can be studied due to underlying memory restrictions in the analysis method. This paper develops an index method that localises the analysis and suggests a computation framework that opens the way for analysis of medium scale problems.

关键词： Piecewise linear analysis nonlinear systems computer-aided control system design

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MULTIOBJECTIVE controlLER design: OPTIMISING controlLER STRUCTURE WITH GENETIC ALGORITHMS

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IFAC Proceedings Volumes 2005年第1期38卷 51-56页

作者： A. Molina-Cristóbal I.A. Griffin P.J. Fleming D.H. Owens Dept. Automatic Control and Systems Engineering The University of Sheffield Mappin Street Sheffield S1 3JD UK

This paper studies the open problem of reduced- and fixed-order H ∞ synthesis. Often, this non-convex constraint is tackled with iterative convex optimisation procedure over LMI constraints. In this paper, an evolutionary approach is proposed such that the trial and error approach involved in LMI techniques might be overcome. The order of the controller is optimised as a multiobjective problem over a set of controller structures, H ∞ , and time-domain specifications. Numerical results are presented with its counterpart the LMI procedure design, that show the advantage of investigating the Pareto optimal set resulting from the design procedure proposed.

关键词： Multiobjective optimisation genetic algorithms linear matrix inequalities fixed-order systems order reduction computer-aided control system design

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Robust Synthesis With Antiwindup Compensation for Electrohydraulic Servomechanism

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IFAC Proceedings Volumes 2001年第15期34卷 197-202页

作者： Felicia Ursu Ioan Ursu Mihai Vladimirescu "Elie Carafoli" National Institute of Aerospace Research Bdul Iuliu Maniu 220 77538Bucharest sector 6 Romania COM DEV Ltd Space Group 155 Sheldon Drive Cambridge Ontario N1R 7H6 Canada

The robust control of a general servomechanism problem is applied in the case of electrohydraulic servo actuating primary flight controls. The servocompensator structure is proved to be close to the one designed for step signals. The stabilizing compensator is ensured by the way of a linear quadratic optimal procedure. An antiwindup compensation is added to deal with the adverse effects caused by control saturation. The proof is made involving the form of a feedback compensation matrix. Numerical simulations are presented to validate the proposed procedure.

关键词： electrohydraulic systems actuators flight control robust control windup saturation control optimal control computer-aided control system design

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Towards Computational Hybrid system Semantics for Time-Based Block Diagrams

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IFAC Proceedings Volumes 2009年第17期42卷 376-385页

作者： Pieter J. Mosterman Justyna Zander Gregoire Hamon Ben Denckla The MathWorks Natick MA 01760 USA Fraunhofer Institute FOKUS 10589 Berlin Germany Denckla Consulting Los Angeles CA USA

At the core of Model-Based design, computational models have caused an autocatalytic trend to use computation in design by unlocking the potential of model transformations. Precisely specifying a computational transformation requires well-defined semantics of the source and target representations. In this regard, continuous-time behavior is an essential aspect of time-based block diagrams that is typically approximated by numerical integration. The corresponding theory, however, is mostly concerned with local error and the mathematical semantics of long time behavior fails to be sufficiently precise from a computational perspective. In this work, first a computational semantics is developed based on a multi-stage variablestep solver. Next, the computational semantics of the discrete and continuous parts of hybrid systems and their interaction are formalized in a unifying framework. The framework exploits a successful functional approach to defining discrete-time and discrete-event behavior established in other work. Unification is then achieved by developing a computational representation of the continuous-time behavior as pure functions on streams.

关键词： Computational methods computer simulation computer-aided control system design Embedded systems Numerical simulation Synchronous data flow systems design Variable-structure systems Verification Zero crossings

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The Role of Interactivity in control Learning

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IFAC Proceedings Volumes 2003年第10期36卷 1-12页

作者： S. Dormido Bencomo Dept. Informática y Automática. Facultad de Ciencias. U.N.E.D. Avenida Senda del Rey 9. 28040 Madrid. Spain

The scenario for control education is changing and we must adapt to the new situation. Information technology opens a whole new world of real opportunitie. computers show a great potential to enhance student achievement, but only if they are used appropriately as part of a coherent education approach. computers do not change in the way books or labs do, they allow us to go deeper and faster. This paper presents the personal experience of the author in the use of interactive tools in order to make students more active and involved in their own control engineering learning process. Some examples, with different degrees of complexity, have been selected in order to show how we can use the control visualization concept in a new family of interactive tools for control education.

关键词： Education control education Interactive approaches computer-aided control system design Teaching

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