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Mediterranean Conference on control and Automation (MED)

作者： Rafal Jó zefowicz Marcin Witczak Vicenç Puig Institute of Control and Computation Engineering University of Zielona Góra Zielona Gora Poland Automatic Control Departament-Campus de Terrassa Universidad Politécnica de Cataluña Terrassa Spain

The paper deals with the problem of estimating an unknown input distribution matrix for non-linear discrete-time stochastic systems. In particular, it is shown how to use the unscented Kalman filter as an unknown input filter. Subsequently, an analysis of the impact of unknown input decoupling on the fault detection is performed and a suitable fault detection condition is developed. Based on the achieved results, a numerical optimisation-based approach is proposed that can be used to estimate the unknown input distribution matrix. The final part of the paper presents an illustrative example with an induction motor, which confirms the performance of the proposed approach.

关键词： Integrated optics

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Repetitive process based iterative learning control design using frequency domain analysis

Repetitive process based iterative learning control design u...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Wojciech Paszke Krzysztof Galkowski Eric Rogers Institute of Control and Computation Engineering University of Zielona Góra ul. Zielona Góra Poland Electronics and Computer Science University of Southampton UK

ISBN: (纸本)9781467345033

This paper gives new results on the design of iterative learning control laws that enables one step design of a stabilizing feedback controller in the time domain and a feedforward (learning) controller which guarantees convergence in the trial domain. The Kalman-Yakubovich-Popov lemma is central to the analysis and the resulting computations use convex optimization over linear matrix inequalities. An illustrative example is given based on the model of an experimental facility that has been used to compare alternative iterative learning control designs.

关键词： Linear matrix inequalities Symmetric matrices Vectors Process control Convergence Robots Stability analysis

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Managing the Mobility of a Cooperative Ad Hoc Network Using Clusters Formation and Potential Function

Managing the Mobility of a Cooperative Ad Hoc Network Using ...

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International Conference on Wireless Communications, Networking and Mobile Computing

作者： Ewa Niewiadomska-Szynkiewicz Andrzej Sikora Institute of Control and Computation Engineering Warsaw University of Technology

ISBN: (纸本)9781612846842

A cooperative ad hoc network is a collection of wireless devices that collaborate with each other to form a network system that dynamically adapts to changes in an unknown environment to achieve a given goal. Such a network is often built from mobile devices. Mobility modeling is a critical element that influences the performance characteristics of an ad hoc network. In this paper, we describe an algorithm for calculating mobility patterns for mobile devices that is based on a cluster formation and an artificial potential function. Finally, we present the application of our mobility model to simulation-based design of a self-organizing and cooperative ad hoc network.

关键词： Ad hoc network Self-organizing network MANET Mobility model

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Mobility model for self-organizing and cooperative MSN and MANET systems

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Sensors and Transducers 2012年第SPEC. 2期14卷 164-178页

作者： Sikora, Andrzej Niewiadomska-Szynkiewicz, Ewa Institute of Control and Computation Engineering Warsaw University of Technology ul. Nowowiejska 15/19 00-665 Warsaw Poland ul. Wawozowa 18 02-796 Warsaw Poland

Self-organization mechanisms are used for building scalable systems consisting of a huge number of subsystems. In computer networks, self-organizing is especially important in ad hoc networking. A self-organizing ad hoc network is a collection of wireless devices that collaborate with each other to form a network system that adapts to achieve a goal or goals. Such network is often built from mobile devices that may spontaneously create a network and dynamically adapted to changes in an unknown environment. Mobility pattern is a critical element that influences the performance characteristics of mobile sensor networks (MSN) and mobile ad hoc networks (MANET). In this paper, we survey main directions to mobility modeling. We describe a novel algorithm for calculating mobility patterns for mobile devices that is based on a cluster formation and an artificial potential function. Finally, we present the simulation results of its application to a rescue mission planning. © 2012 IFSA.

关键词： Mobile ad hoc networks

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Modeling for decision support in network-based services

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Lecture Notes in Business Information Processing 2012年 42 LNBI卷 1-13页

作者： Dolk, Daniel Granat, Janusz Dept of Information Sciences Faculty of Electronics Naval Postgraduate School Monterey CA 93943 United States Institute of Control and Computation Engineering Warsaw University of Technology National Institutute of Telecommunications Warsaw Poland

ISBN: (纸本)9783642276118

In this introduction to the book, we discuss our current motivation for modeling and optimization applications involving network-based services. Our conceptual model of service science management and engineering (SSME) as the basis for better understanding network-based services embraces the confluence of network science, computational and analytical modeling, knowledge science and decision support. We segment the contributed articles into these four categories and provide a capsule summary of each paper. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Decision support systems

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Cell-phone based Drowsiness Monitoring and Management system

Cell-phone based Drowsiness Monitoring and Management system

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IEEE Biomedical Circuits and Systems (BIOCAS)

作者： Yu-Te Wang Chung-Kuan Cheng Kuan-Chih Huang Chin-Teng Lin Yijun Wang Tzyy-Ping Jung Department of Computer Science and Engineering University of California San Diego La Jolla USA Institute of Electrical Control Engineering National Chiao-Tung University Hsinchu Taiwan Institute of Engineering in Medicine Institute for Neural Computation University of California San Diego La Jolla USA

In recent years, driving fatigue and cognitive lapses have gained increasing attentions in the fields of public security, especially regarding the safe manipulation of vehicles. Studies have explored the relation between electroencephalogram (EEG) and driving behavior and several of them further proposed effective approaches (e.g., auditory feedback) to arouse subjects from drowsiness. However, these studies were performed under laboratory-oriented configurations using tethered, ponderous EEG equipment. In real environments, the setup of bulky cognitive monitoring equipment with a long-prep time is not feasible. Therefore, this study extends previous laboratory work by developing an on-line Drowsiness Monitoring and Management (DMM) System featuring a mobile wireless dry-sensor EEG headgear and a cell-phone based real-time EEG processing platform. The DMM system can continuously observe EEG dynamics, deliver arousing feedback to users experiencing momentary cognitive lapses, and assess the efficacy of the feedback in near real-time.

关键词： Electroencephalography Monitoring Mobile communication Wireless communication Wireless sensor networks Real-time systems Educational institutions

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Design of an unknown input observer for fault diagnosis of non-linear systems with state constraints *

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IFAC Proceedings Volumes 2012年第20期45卷 1065-1070页

作者： Marcin Witczak Vicenç Puig Łukasz Dziekan Institute of Control and Computation Engineering University of Zielona Góra ul. Podgórna 50 65-246 Zielona Góra Automatic Control Departament - Campus de Terrassa Universidad Politécnica de Cataluña Rambla Sant Nebridi 10 08222 Terrassa Spain

The paper deals with the problem of designing observers for a class of discrete-time nonlinear systems with an unknown input. In particular, with the use of the Lyapunov method, a design procedure of an asymptotically convergent observer is proposed. Moreover, the effect of decoupling an unknown input is investigated in the light of an undesirable decoupling of possible faults. As a result, a condition for checking an undesirable fault decoupling is provided. Subsequently, it is shown how to employ the proposed robust fault diagnosis observer for the non-linear systems with state constraints. The final part of the paper shows experimental results that confirm the effectiveness of the proposed approach and the potential profits that can be achieved while applying the proposed approach in the fault diagnosis scheme. Copyright © 2012 IFAC

关键词： nonlinear systems state estimation observers unknown input observer convergence LMI

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Online Learning Algorithm for Stackelberg Games in Problems with Hierarchy

Online Learning Algorithm for Stackelberg Games in Problems ...

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IEEE Annual Conference on Decision and control

作者： K. G. Vamvoudakis F. L. Lewis M. Johnson W. E. Dixon Center for Control Dynamical-systems and Computation (CCDC) University of California Automation and Robotics Research Institute University of Texas at Arlington NASA Ames Research Center Department of Mechanical and Aerospace Engineering University of Florida

ISBN: (纸本)9781467320658

This paper presents an online adaptive optimal control algorithm based on policy iteration reinforcement learning techniques to solve the continuous-time Stackelberg games with infinite horizon for linear systems. This adaptive optimal control method finds in real-time approximations of the optimal value and the Stackelberg-equilibrium solution, while also guaranteeing closed-loop stability. The optimal-adaptive algorithm is implemented as a separate actor/critic parametric network approximator structure for every player, and involves simultaneous continuous-time adaptation of the actor/critic networks. Novel tuning algorithms are given for the actor/critic networks. The convergence to the closed-loop Stackelberg equilibrium is proven and stability of the system is also guaranteed. A simulation example shows the effectiveness of the new online algorithm.

关键词： Stackelberg games Hierarchical control problems adaptive optimal control Social Hierarchy Game theory e-learning infinite horizon Best value algorithms

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New frequency domain based stability tests for 2D linear systems

New frequency domain based stability tests for 2D linear sys...

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International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Wojciech Paszke Eric Rogers Paolo Rapisarda Krzysztof Gałkowski Anton Kummert Institute of Control and Computation Engineering University of Zielona Góra Zielona Gora Poland School of Electronics and Computer Science University of Southampton Southampton UK Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Wuppertal Germany

This paper develops a new set of stability conditions for asymptotic stability of two-dimensional linear systems described by Roesser and Fornasini-Marchesini state-space models through extensive use of the Kalman-Yakubovich-Popov lemma. The resulting tests are formulated in terms of a convex optimization problem over linear matrix inequality constraints. Testing the resulting conditions only requires computations on matrices with constant entries with consequent computational load advantages when compared with alternatives, especially when direct extension to stabilizing control law design is required. Illustrative numerical examples are also given.

关键词： Linear systems Stability analysis Asymptotic stability Numerical stability Polynomials Vectors State-space methods

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Mobile system for non destructive testing of weld joints via time of flight diffraction (TOFD) technique

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Lecture Notes in control and Information Sciences 2012年 422卷 65-74页

作者： SiemiĄtkowska, Barbara Chojecki, Rafal Wiśniowski, Mateusz Walȩcki, Michal Wielgat, Marcin Michalski, Jakub Institute of Automatic Control and Robotics Warsaw University of Technology ul. Św. A. Boboli 8 Warsaw 02-525 Poland Institute of Control and Computation Engineering Warsaw University of Technology ul. Nowowiejska 15/19 Warsaw 00-665 Poland Materials Engineers Group Ltd. ul. Woloska 141 Warsaw 02-507 Poland

ISBN: (纸本)9781447123422

This paper describes research towards the development of a robotic system for automated welded joint testing. The tests are often carried out manually by skilled personnel. Automating the inspection process would reduce errors and associated costs. The system proposed in this paper is based on a mobile robot platform and is designed to carry ultrasonic sensors in order to scan welds for defects. The robot is equipped with a vision system in order to detect the weld position. A fuzzy control system is used in order to control robot motion along the weld. © 2012 Springer London.

关键词： Welds

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