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IEEE Conference on Decision and control

作者： W. Paszke K. Gakowski E. Rogers A. Kummert D.H. Owens Institute of Control and Computation Engineering University of Zielona Góra Zielona Góra Poland School of Electronics and Computer Science University of Southampton Southampton UK Faculty of Electrical University of Wuppertal Wuppertal Germany Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

Repetitive processes are a distinct class of 2D systems (*** propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or 2D systems theory. Here we give new results on the design of physically based control laws and, in particular, the first results on a mixed H 2 /H ∞ approach and on H 2 control in the presence of uncertainty in the process model.

关键词： Robust control control systems Linear systems Uncertainty Writing Disk drives Process control Iterative algorithms control engineering computing computer science

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Robust adaptive control of quasi-LPV systems

Robust adaptive control of quasi-LPV systems

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Xiukun Wei L. Del Re Jindong Tan Faculty of the institute of Design and Control of Machatronical Systems Johannes Kepler University Linz Austria Johannes Kepler Universitat Linz Linz AT Faculty of Department of Electrical and Computer Engineering Michigan Technological University USA

In this paper a robust adaptive pole placement method for a class of linear parameter varying (LPV) system based on input-output description is constructed after the LPV system model, including its un-modeled error model term, is presented. The recursive least square estimation algorithm with dead zone is applied for the parameter estimation. The robust stability of closed-loop system is analyzed and the robust bound is derived. One simulation example illustrates the effectiveness of the control algorithm and demonstrates that the adaptive control based on LPV model can achieve better performance than the controller based on linear time varying (LTV) model

关键词： Robust control Adaptive control Least squares approximation Robustness Parameter estimation Nonlinear systems control systems Programmable control State feedback Robust stability

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H 2 control OF DIFFERENTIAL LINEAR REPETITIVE PROCESSES

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IFAC Proceedings Volumes 2005年第1期38卷 55-60页

作者： Wojciech Paszke Krzysztof Galkowski Eric Rogers David H. Owens University of Zielona Gora Institute of Control and Computation Engineering URL. Podgórna 50 65-246 Zielona Gora Poland School of Electronics and Computer Science University of Southampton Southampton SO17 1BJ UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD UK

Repetitive processes are a distinct class of two-dimensional systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or two-dimensional (2D) systems theory. Here we give new results on the design of physically based control laws using an H 2 setting. These results are for the sub-class of so-called differential linear repetitive processes which arise in applications areas such as iterative learning control.

关键词： H 2 control differential linear repetitive processes linear matrix inequalities

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The influence of feedback/feedforward control on relaxed pass profile controllability of discrete linear repetitive processes

The influence of feedback/feedforward control on relaxed pas...

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International Workshop on Multidimensional (nD) systems

作者： L. Hladowski K. Galkowski E. Rogers A. Kummert D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland University of Wuppertal Germany School of Electronics and Computer Science University of Southampton Southampton UK Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Germany Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

Repetitive processes are a distinct class of 2D systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or 2D systems theory. Here we give the first results on how feedback/feedforward control action can be used to influence one form of controllability for processes with discrete dynamics.

关键词： Linear feedback control systems controllability Integrated circuit modeling control engineering computing Vectors Communication system control computer science systems engineering and theory State-space methods Multidimensional systems

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Experimental validation of multi-vehicle coordination strategies

Experimental validation of multi-vehicle coordination strate...

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2005 American control Conference, ACC

作者： Marshall, J.A. Fung, T. Broucke, M.E. D'Eleuterio, G.M.T. Francis, B.A. Systems Control Group Department of Electrical and Computer Engineering University of Toronto 10 King's College Rd Toronto Ont. M5S 3G4 Canada Space Robotics Group University of Toronto Institute for Aerospace Studies 4925 Dufferin St Toronto Ont. M3H 5T6 Canada

Consequent to previously published theoretical work by Marshall, Broucke, and Francis, this paper summarizes the apparatus and results of multi-vehicle coordination experiments conducted at the University of Toronto Institute for Aerospace Studies. These experiments successfully demonstrated the practicality of cyclic pursuit as a distributed control strategy for multiple wheeled-vehicle systems. Moreover, the pursuit-based coordination algorithm was found to be surprisingly robust in the presence of unmodelled dynamics and delays due to sensing and information processing. © 2005 AACC.

关键词： Intelligent vehicle highway systems

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CONTINUOUS TIME SYSTEM IDENTIFICATION OF NONPARAMETRIC MODELS WITH CONSTRAINTS

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IFAC Proceedings Volumes 2005年第1期38卷 213-218页

作者： Liuping Wang Peter J. Gawthrop Peter C. Young School of Electrical and Computer Engineering RMIT University Melbourne Australia Center for Systems and Control and Department of Mechanical Engineering University of Glasgow GLASGOW. G12 8QQ Scotland Centre for Research on Environmental Syst. and Stat. Lancaster University LA 14 YQ UK

Although structural constraints such as model order and time delay have been incorporated in the continuous time system identification since its origin, the constraints on the estimated model parameters were rarely enforced. This paper proposes a continuous time system identification approach with constraints. It shows that by incorporating physical parameter information known a priori as hard constraints, the traditional parameter estimation schemes are modified to minimize a quadratic cost function with linear inequality constraints. Using the structure of Frequency Sampling Filters as the vehicle, the paper shows that the constraints can be readily imposed on continuous time frequency response estimation and step response estimation. In particular, a priori knowledge in both time-domain and frequency domain is utilized simultaneously as the constraints for the optimal parameter solution. A Monte-Carlo simulation study with 100 noise realization is used to demonstrate the improvement of the estimation results in terms of continuous time frequency response and continuous time step response.

关键词： Continuous time system identification nonparametric model frequency response step response constraints

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An improved multiagent reinforcement learning algorithm

An improved multiagent reinforcement learning algorithm

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IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT)

作者： Xiangping Meng R. Babuska L. Busoniu Yu Chen Wanyu Tan Department of Electrical Engineering Changchun Institute of Posts and Telecommunications China Department of Electrical Engineering Changchun Institute of Technology P. R. China Delft Center for Systems and Control Delft University of Technology The Netherlands Department of Computer Engineering Northeast China Institute of Electric Power P.R. China

An improved reinforcement learning algorithm is proposed in this paper. This algorithm is based on linear programming method for finding the best-response policy. A pursuit example is tested and the results show that this algorithm has some properties, such as easy computation, simple operation procedure and can guarantee a good learning convergence.

关键词： Learning Stochastic processes Multiagent systems Linear programming Testing Pursuit algorithms control systems Power engineering computing Power engineering and energy Convergence

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An object-oriented platform-based design process for embedded real-time systems

An object-oriented platform-based design process for embedde...

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International Symposium on Object-Oriented Real-Time Distributed Computing

作者： M.A. Wehrmeister L.B. Becker F.R. Wagner C.E. Pereira Computer Science Institute Federal University of Rio Grande do Sul Brazil Automation and Control Systems Department Federal University of Santa Catarina Brazil Electrical Engineering Department Federal University of Rio Grande do Sul Brazil

The growing complexity of today's embedded real-time systems demands new methods and tools in order to manage the problems of design, analysis, integration and validation of complex systems. This paper describes an object-oriented platform-based design process for real-time embedded systems. The proposed approach promotes a smooth transition from high-level UML specification to implementation, which is composed by hardware and software components. The transition from higher to lower abstraction levels is facilitated by the use of an OO realtime API, whose underlying facilities can be optimized according to the application needs and selected platform. An integrated toolset is used to support the intermediate steps of the design process. In order to illustrate the proposed approach and related toolset the design of an embedded real-time automation system for an "intelligent" wheelchair is presented.

关键词： Process design Real time systems Embedded system Hardware Embedded software Design methodology Unified modeling language Design automation Object oriented modeling Java

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Design exploration in HW/SW co-design of real-time object-oriented embedded systems: the scheduler object

Design exploration in HW/SW co-design of real-time object-or...

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Workshop on Object-Oriented Real-Time Dependable systems (WORDS)

作者： E.T. Silva M.A. Wehrmeister L.B. Becker F.R. Wagner C.E. Pereira Computer Science Institute Federal University of Rio Grande do Sul Brazil Automation and Control Systems Department Federal University of Santa Catarina Brazil Electrical Engineering Department Federal University of Rio Grande do Sul Brazil

This paper discusses a design flow for multithread object-oriented real-time applications, running on top of an embedded, platform-based, customizable Java processor, which is prototyped using affordable FPGAs. The proposed approach enforces design space exploration activities, taking into account aspects like temporal behavior, memory footprint, and power/energy consumption. A case study containing a task scheduler implementation as both software and hardware modules is presented. While both implementations are compatible with the developed program from an interface point of view, they lead to different timing and footprint requirements. Their evaluation in terms of memory occupation and number of FPGA logic cells is presented.

关键词： Real time systems Embedded system Processor scheduling Field programmable gate arrays Application software Java Software prototyping Prototypes Space exploration Energy consumption

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Steady-state invariant frequency and amplitude droop control using adaptive output impedance for parallel-connected UPS inverters

Steady-state invariant frequency and amplitude droop control...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： J.M. Guerrero L.G. de Vicuna J. Matas J. Miret J. Cruz Department of Automatic Control Systems and Computer Engineering Sustainable Distributed Generation Systems and Renewable Energy Group Escola Universitària d'Enginyeria Tècnica Industrial de Barcelona Barcelona Spain Department of Electronic Engineering Universitat Politecnica de Catalunya Spain Department of Electronic Engineering Vilanova i la Geltrú Sustainable Distributed Generation Systems and Renewable Energy Group Escola Universitària d'Enginyeria Tècnica Industrial de Barcelona Barcelona

In this paper, a novel wireless load-sharing controller for parallel connected UPS inverters is proposed. As opposed to the conventional droop method, the proposed method achieves stable steady-state frequency and amplitude. The paper explorers the output impedance of the UPS inverters, and adaptive virtual output impedance is proposed in order to reduce its line impedance impact. Experimental results are presented from two 6 kVA UPS inverters controlled by TMS320LF2407A DSP boards, showing the feasibility of the proposed approach

关键词： Steady-state Frequency Programmable control Adaptive control Impedance Uninterruptible power systems Inverters Reactive power control systems Power engineering and energy

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