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20th World Congress of the International-Federation-of-Automatic-Control (IFAC)

作者： Kuti, Jozsef Galambos, Peter Baranyi, Peter Obuda Univ Antal Bejczy Ctr Intelligent Robot Becsi Ut 96-B H-1034 Budapest Hungary Budapest Univ Technol & Econ Dept Telecommun & Media Informat Magyar Tudosok Krt 2 H-1117 Budapest Hungary Szechenyi Istvan Univ Dept Informat Egyetem Ter 1 H-9026 Gyor Hungary

The paper revisits and renew the concept of Polytopic Tensor Product (TP) Model based control analysis and synthesis by generalizing the use of TP-structured variables in the definite conditions derived from the applied control criteria. For TP forms that can depend on multivariate parameter sets (optionally with two times or larger multiplicities), a compact TP formalism is proposed where the multiplicity vector describes the structure. By setting the multiplicities, the parameter dependencies can be neglected or considered with arbitrary high complexity in the variables of controller-candidate, Lyapunov-function candidate and slack variables as well. The paper points out that the definite conditions on the structures of these variables results in definite conditions on Polytopic TP forms enabling a recursive method to reformulate them into Linear Matrix Inequalities (LMIs), Bilinear Matrix Inequalities (BMIs), etc. according to the design method in consideration. The application of the novel concept is shown through H-infinity state feedback design for Linear Parameter Varying (LPV) systems. (C) 2017, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Gain scheduling LPV methodologies robust adaptive control controller constraints and structure TP model transformation

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A linear programming approach to routing control in networks of constrained nonlinear positive systems with concave flow rates

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AUTOMATICA 2016年 68卷 357-368页

作者： Arneson, Heather Dousse, Nicolas Langbort, Cedric NASA Ames Res Ctr Aviat Syst Div POB 1MS 210-6 Moffett Field CA 94035 USA Ecole Polytech Fed Lausanne Lab Intelligent Syst EPFL STI IMT LIS Stn 11 CH-1015 Lausanne Switzerland Univ Illinois Dept Aerosp Engn 306 Talbot LabMC 236104 S Wright St Urbana IL 61801 USA

We consider control design for positive compartmental systems in which each compartment's outflow rate is described by a concave function of the amount of material in the compartment. We address the problem of determining the routing of material between compartments to satisfy time-varying state constraints while ensuring that material reaches its intended destination over a finite time horizon. We give sufficient conditions for the existence of a time-varying state-dependent routing strategy which ensures that the closed-loop system satisfies basic network properties of positivity, conservation and interconnection while ensuring that capacity constraints are satisfied, when possible, or adjusted if a solution cannot be found. These conditions are formulated as a linear programming problem. Instances of this linear programming problem can be solved iteratively to generate a solution to the finite horizon routing problem. Results are given for the application of this control design method to an example problem. Published by Elsevier Ltd.

关键词： Linear programming Control of networks Positive systems controller constraints and structure

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A noninteracting control strategy for the robust output synchronization of linear heterogeneous networks

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Control Theory and Technology 2014年第3期12卷 234-249页

作者： Saman KHODAVERDIAN Jürgen ADAMY Institute of Automatic Control and Mechatronics Control Methods and Robotics Lab Technische Universitt DarmstadtLandgraf-Georg-Str.464283 Darmstadt Germany

This paper deals with the problem of robust output synchronization for heterogeneous multi-agent systems. First, a new synchronization approach is presented to synchronize the outputs of heterogeneous agents. Based on noninteracting control techniques, a method is derived for homogenizing the input-output behavior of every agent. Hence, applying the same reference input signal to every agent leads to synchronization. Furthermore, a strategy for increasing the robustness of the synchronization process against exogenous disturbances is presented, which leads to a structurally constrained optimization problem. However, by a convenient reformulation of the problem, well established tools from robust control theory can be used. Moreover, it is shown that this procedure allows to separate the robustness issue from the synchronization task. The effectiveness of the approach is illustrated by a robust output synchronization example for a heterogeneous aircraft fleet.

关键词： Heterogeneous networks Multi-agent systems Decentralized control Robust synchronization Disturbance rejection controller constraints and structure

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Progressive events in supervisory control and compositional verification

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Control Theory and Technology 2014年第3期12卷 317-329页

作者： Simon Ware Robi Malik School of Electronic and Electrical Engineering Nanyang Technological UniversitySingapore Department of Computer Science University of WaikatoHamilton New Zealand

This paper investigates some limitations of the nonblocking property when used for supervisor synthesis in discrete event systems. It is shown that there are cases where synthesis with the nonblocking property gives undesired results. To address such cases, the paper introduces progressive events as a means to specify more precisely how a synthesised supervisor should complete its tasks. The nonblocking property is modified to take progressive events into account, and appropriate methods for verification and synthesis are proposed. Experiments show that progressive events can be used in the analysis of industrial-scale systems, and can expose issues that remain undetected by standard nonblocking verification.

关键词： Model validation in design methods controller constraints and structure Computational issues

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A linear programming approach to routing control in networks of constrained linear positive systems

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AUTOMATICA 2012年第5期48卷 800-807页

作者： Arneson, Heather Langbort, Cedric Univ Illinois Dept Aerosp Engn Urbana IL 61801 USA

We study routing control in dynamic continuous-time networks in which each node is described by a linear internally positive system. We derive a linear programming (LP) characterization of optimal constant routing policies for the infinite-horizon routing problem under weighted l(1) constraints and objective. For finite horizon problems with piecewise constant state constraints, we provide sufficient feasibility conditions, which also take the form of an LP problem. We illustrate the solution for the finite horizon problem in an application example. Published by Elsevier Ltd

关键词： Linear programming Control of networks Positive systems controller constraints and structure

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A study on Prediction Requirements in time-domain Control of Wave Energy Converters

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IFAC Proceedings Volumes 2010年第20期43卷 372-377页

作者： Francesco Fusco Jean-Cristophe Gilloteaux John Ringwood Electronic Engineering Department National University of Ireland Maynooth Ireland

Wave energy converters (WECs) based on oscillating bodies or oscillating water columns would earn huge benefits from a time-domain control on a wave by wave basis. Such a control would allow efficient energy extraction over a wider range of frequencies than what could possibly be achieved when no real-time control is adopted, thus increasing the economical attractiveness of the WECs. Almost every control strategy that showed some potential, however, suffers from the problem that future knowledge of the incident wave elevation, or wave excitation force, is required. In this paper a general control framework for oscillating WECs is presented and a methodology to understand and quantify the wave excitation force prediction requirements, along with the achievable prediction accuracy, is discussed. The two features are compared against each other and linked to the dynamic characteristics of a device. Along with the qualitative discussion, the methodology is applied to some heaving cylinders when reactive control and linear passive control are applied, under different sea conditions.

关键词： Wave energy controller constraints and structure time series forecasting

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Analysis & design of a collaboration opportunity characterization tool for virtual organisations Cre

Analysis & design of a collaboration opportunity characteriz...

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17th World Congress, International Federation of Automatic Control, IFAC

作者： Concha, David Romero, Tania Romero, David Galeano, Nathalie Jimenez, Guillermo Molina, Arturo

ISBN: (纸本)9783902661005

This paper presents the conceptual foundations relevant to the proper design and implementation of a software tool to support a broker or a business integrator in the context of a Virtual Organisation (VO) for partners search and selection for a specific business/collaboration opportunity. The Collaboration Opportunity Characterization tool detailed in this paper provides functionalities for decomposing a collaboration opportunity into items, which can be individually mapped to the specific competencies required for achieving the VO business/collaborative objectives, once the competencies required are specified, this competency-related information can be used for the further selection of proper VO partners to tackle a specific business/collaboration opportunity. Copyright © 2008 IFAC.

关键词： Analytic design controller constraints and structure Model validation in design methods

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Synthesis of fixed-structure H ∞ controllers via Constrained Particle Swarm Optimization

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IFAC Proceedings Volumes 2008年第2期41卷 7843-7848页

作者： Ichiro Maruta Tae-Hyoung Kim Toshiharu Sugie Department of Systems Science Kyoto University Uji Kyoto 611-0011 Japan CREST Japan Science and Technology Agency 4-1-8 Honcho Kawaguchi-shi Saitama 332-0012 Japan

This paper provides a design method of fixed-structure robust controllers satisfying multiple H ∞ norm specifications by using a sort of randomized algorithms. First, a new tool to perform general constrained optimization is developed which does not need any gradient or derivative of the objective function. This tool is based on PSO (particle swarm optimization), which attracts a lot of attention recently in the evolutionary computation area due to its empirical evidence of its superiority in solving various non-convex problems. Second, it is shown how to design a fixed-structure controller satisfying given multiple H ∞ specifications by using the developed optimization tool. Third, its effectiveness is evaluated through various numerical examples, because it is difficult to guarantee the performance of the proposed method theoretically due to a probabilistic nature of the PSO. The simulation results demonstrate its effectiveness clearly.

关键词： Optimization based controller synthesis Robust controller synthesis controller constraints and structure Parametric optimization Evolutionary algorithms Probabilistic robustness

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Design Approach for Hard Disk Drive Settle Performance Optimization

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IFAC Proceedings Volumes 2008年第2期41卷 1791-1796页

作者： Julian H. Stoev Ho Seong Lee Samsung Electronics 443-742 Maetan-3Dong Yeongtong-Gu Suwon-City Gyeonggi-Do Korea (Tel: +82-31-200-8707 Samsung Electronics 443-742 Maetan-3Dong Yeongtong-Gu Suwon-City Gyeonggi-Do Korea (Tel: +82-31-200-8380

A design approach is presented for constrained optimization of feed-forward signal using closed loop impulse response. The approach is flexible and is possible to integrate easily with the existing controller structur... 详细信息

关键词： Parametric optimization controller constraints and structure Industrial applications of optimal control

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Relations Between Control Signal Properties and Robustness Measures

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IFAC Proceedings Volumes 2008年第2期41卷 8713-8718页

作者： Per-Ola Larsson Tore Hägglund Department of Automatic Control Lund University Box 118 SE-211 00 Lund Sweden

In this paper we consider control signal properties, such as maximum magnitude and activity, as well as system robustness measures. We derive an ideal controller and control signal for exponential disturbance rejection for a first order process with time delay. For the resulting closed-loop system, it is shown analytically that there are strong interconnections between robustness measures and control signal properties regarding load disturbance attenuation. The results imply that popular controller design methods implicitly take control signal properties into consideration.

关键词： controller constraints and structure disturbance rejection constrained control robust time-delay systems robustness analysis

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