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IFAC Workshop on Networked Robotics, NetRob09

作者： Sun, Wei Chen, Yang Quan Dept. of Automatic Control Beijing Institute of Technology Beijing 100081 China Dept. of Electrical and Computer Engineering Utah State University Logan UT 84322 United States

ISBN: (纸本)9783902661531

Scale-free network and consensus among multiple agents have both drawn quite much attention. To investigate the consensus speed over scale-free networks is the main topic in this paper. Given a set of different values for the power-law distribution parameter γ, and a set of different values for the minimum degree (dmin) for the nodes, the algebraic connectivity (γ2) of the network topology is studied, as well as the time (t c) (or iteration (kc), for discrete algorithm) taken to reach consensus. The results exhibit that γ2 decreases while increases. The γ2 increases monotonically as dmin grows, and they fit very well in a linear relationship. tc (or kc) decreases as reduces and dmin increases. Via observing the behavior of the largest eigenvalue (γn) of the Laplacian of the network topology, we draw the conclusion that the robustness over time delays declines while the robustness over node-failures and edge-failures increases. © 2009 IFAC.

关键词： Iterative methods

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Web-based control laboratory: The ball and beam system

Web-based control laboratory: The ball and beam system

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作者： Guinaldo, M. Vargas, H. Sánchez, J. Sanz, E. Dormido, S. Dept. Of Computer Science and Automatic Control UNED C/ Juan del Rosal 16 28040 Madrid Spain

ISBN: (纸本)9783902661562

This paper presents a Web-based control laboratory of a non-linear and unstable system: the ball and beam plant. Different control strategies, apart from the traditional PID, as Robust, Fuzzy and PD-Reset control have been taken to give students a wider vision of control approaches. The client-side of the virtual laboratory has been developed using EJS (Easy Java Simulations), an open-source tool that allows creating Java applications easily. Meanwhile, the application that locally interacts with the system is written in LabVIEW. Different experiences are presented showing the advantages of advanced control strategies over PD control.

关键词： Websites

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Reconfigurable parallel kinematic manipulator for flexible manufacturing

Reconfigurable parallel kinematic manipulator for flexible m...

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作者： Haage, Mathias Dressler, Isolde Robertsson, Anders Nilsson, Klas Brogardh, Torgny Johansson, Rolf Dept. Computer Science LTH Lund University Lund Sweden Dept. Automatic Control LTH Lund University Lund Sweden ABB Robotics SE-72168 Vasteras Sweden

ISBN: (纸本)9783902661432

Flexible manufacturing puts high demands on industrial automation in terms of affordable and competitive solutions and is of key importance for short-lot production typically found in small and medium sized enterprises, situations where today manual labour is extensively used despite e.g., environmental issues and harsh working conditions. Key factors in the successful introduction of new robot automation concepts are that they provide both the desired performance and quality (technical capability), but also that they enable fast deployment and extend available task repertoire. The Gantry-Tau manipulator is a new robot concept which in contrast to other high-performance parallel kinematic manipulators (PKM), has a large, open working range. Its high stiffness makes it ideal for a wide range of tasks such as grinding, deburring, and cutting. An additional aspect of such a PKM is the modularity, which in this work has been studied in terms of possibilities for assembly and mechanical reconfiguration at the end-user site, integration of such a kinematically different robot with a standard industrial controller, and new needs for methods/tools to support simple (re)configuration. A range of software tools and methods were found to be useful and necessary for efficient engineering and integration of the concept in typical SME manufacturing scenarios. For experimental evaluation, two full-scale prototype robots were designed and built, the kinematic software was developed and integrated into a couple of different robot control systems, robot CAD software was adapted to the configuration needs, and both simulations and physical experiments were carried out. Our findings make us believe that enhanced software tools should be integrated on a higher symbolic (or meta-) level to better support transformation of data and code generation, but also that the Gantry-Tau type of robot (with adequate software support) will bring a new dimension of flexibility into SME manufacturing.

关键词： Kinematics

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Methods of adjusting MPLS network policies

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UPB Scientific Bulletin, Series C: Electrical Engineering 2009年第3期71卷 121-132页

作者： Rughinis, Razvan Deaconescu, Razvan Dept. of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania

This paper discusses adjustment strategies for MPLS networks, taking into account users demands. Recent developments in MPLS technology are used to propose a new method for analyzing network adjustments, on four dimensions: security, error recovery, Quality of Service and network integration - with a special focus on Grid systems. Two options are evaluated for each dimension: internal differentiation and inter-dimension compensation.

关键词： Quality of service

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Optimization strategies for MPLS traffic engineering

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UPB Scientific Bulletin, Series C: Electrical Engineering 2009年第1期71卷 91-102页

作者： Rughinis, Razvan Deaconescu, Razvan Dept. of Automatic Control Computer Science University POLITEHNICA of Bucharest Bucharest Romania

The paper analyzes optimization strategies for Multiprotocol Label Switching (MPLS) Traffic Engineering in three different areas: Quality of Service awareness, network awareness and the design of routing algorithms. Recent developments in MPLS technology are discussed while identifying the main balancing possibilities within and between the three areas.

关键词： Quality of service

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Environmental surface boundary tracking and description using a UAV with vision

Environmental surface boundary tracking and description usin...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Pablo Lanillos José J. Ruz Gonzalo Pajares Jesus M. de la Cruz Dept. of Computer Architecture and Automatic Control Complutense University Madrid Spain Dept. of Software Engineering and Artificial Intelligence Complutense University Madrid Spain

This work presents a strategy to track and describe the boundary of an environmental surface using a sequence of incomplete boundary images coming from an UAV with a camera onboard. The algorithm uses all captured images to feed the trajectory, which drives the UAV towards the next point to take the next shot, until the identification is completed. The multiple patterns of the input image make the problem difficult. Our approach orders the points of the image to identify the existent edges, and computes the trajectory as a minimization problem using a multi-objective function that gathers information about the boundary and the polynomial that fit in these edges.

关键词： Unmanned aerial vehicles Cameras Data mining Shape Monitoring Spline Image sensors Fires Surveillance computer architecture

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control system design and small signal analysis of APWM resonant inverter for induction heating

Control system design and small signal analysis of APWM reso...

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2009 International Conference on Electric Power and Energy Conversion Systems, EPECS 2009

作者： Helaimi, M. Bettayeb, M. Benghanem, M. Belmadani, B. Dept. of Electrical Engineering University of Hassiba Ben Bouali Chlef Algeria Electrical and Computer Engeneering Dept. College of Engeneering University of Sharjah United Arab Emirates Dep. of Automatic Control University of Mohamed Boudhiaf-Oran Algeria

ISBN: (纸本)9789948427155

This paper proposes an asymmetrical pulse width modulation (APWM) with frequency tracking control of full bridge series resonant inverter for induction heating application. In this method, APWM is used as power regulation, and phased locked loop (PLL) is used to attain zero-voltage-switching (ZVS) over a wide load range. The complete closed loop control model is obtained using small signal analysis. The validity of the proposed control is verified by simulation results.

关键词： Induction heating

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Robust model predictive control of continuous-time sampled-data nonlinear systems with integral sliding mode 10

Robust model predictive control of continuous-time sampled-d...

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2009 10th European control Conference, ECC 2009

作者： Rubagotti, M. Raimondo, D.M. Ferrara, A. Magni, L. Dept. of Computer Engineering and Systems Science University of Pavia Via Ferrata 1 Pavia27100 Italy Automatic Control Laboratory Swiss Federal Institute of Technology Physikstrasse 3 Zürich8092 Switzerland

ISBN: (纸本)9783952417393

A hierarchical Nonlinear Model Predictive control (NMPC) scheme with guaranteed Input-to-State-practical-Stability (ISpS) is proposed. The controller is formed by an Integral Sliding Mode (ISM) controller and a NMPC one. The ISM, relying on the knowledge of the nominal continuous-time model of the system and of the piecewise constant control signal generated by the NMPC produces a control action aimed at reducing the difference between the dynamics of the nominal closed-loop system and the actual evolution of the state. The NMPC in this way can be designed based on a system with reduced uncertainty. In order to prove the stability of the overall control scheme, some general Regional ISpS results for continuous-time systems are proven. © 2009 EUCA.

关键词： Continuous time systems

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Reconfigurable Parallel Kinematic Manipulator for Flexible Manufacturing

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IFAC Proceedings Volumes 2009年第4期42卷 145-150页

作者： Mathias Haage Isolde Dressler Anders Robertsson Klas Nilsson Torgny Brogårdh Rolf Johansson Dept. Computer Science LTH Lund University Lund Sweden Dept. Automatic Control LTH Lund University Lund Sweden ABB Robotics SE-72168 Västerås Sweden

Flexible manufacturing puts high demands on industrial automation in terms of affordable and competitive solutions and is of key importance for short-lot production typically found in small and medium sized enterprises, situations where today manual labour is extensively used despite e.g. , environmental issues and harsh working conditions. Key factors in the successful introduction of new robot automation concepts are that they provide both the desired performance and quality (technical capability), but also that they enable fast deployment and extend available task repertoire. The Gantry-Tau manipulator is a new robot concept which in contrast to other high-performance parallel kinematic manipulators (PKM), has a large, open working range. Its high stiffness makes it ideal for a wide range of tasks such as grinding, deburring, and cutting. An additional aspect of such a PKM is the modularity, which in this work has been studied in terms of possibilities for assembly and mechanical reconfiguration at the end-user site, integration of such a kinematically different robot with a standard industrial controller, and new needs for methods/tools to support simple (re)configuration. A range of software tools and methods were found to be useful and necessary for efficient engineering and integration of the concept in typical SME manufacturing scenarios. For experimental evaluation, two full-scale prototype robots were designed and built, the kinematic software was developed and integrated into a couple of different robot control systems, robot CAD software was adapted to the configuration needs, and both simulations and physical experiments were carried out. Our findings make us believe that enhanced software tools should be integrated on a higher symbolic (or meta-) level to better support transformation of data and code generation, but also that the Gantry-Tau type of robot (with adequate software support) will bring a new dimension of flexibility into SME manufacturing.

关键词： parallel kinematic robots modularity kinematics force control calibration

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A real-time control for path following of an USV

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IFAC Proceedings Volumes 2009年第18期42卷 261-266页

作者： Dictino Chaos David Moreno Joaquín Aranda Jesús M. de la Cruz Dept. Informática y Automática UNED Juan del Rosal 16. 28040 Madrid. Spain Dept of Computers Architecture and Automatic Control UCM 28040 Madrid Spain

control design for marine autonomous vehicles is a subject of great interest in the control systems. These vehicles are strongly non linear and show complex hydrodynamics effects that make difficult the control design. Besides, the use of underactuated vehicles is very important for different reasons like simplicity, cost, efficiency, etc, so these vehicles and their use for collaborative tasks are main topics of investigation. A non linear control for path following for USVs is presented in this work with an infrastructure capable of performing multiple AUV and ROV in collaborative tasks. So this control law and this infrastructure will be used in future projects for formation control of USVs.

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