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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Isidro Calvo Federico Pérez Ismael Etxeberria Guadalupe Morán Dept. of Automatic Control and Systems Engineering University of the Basque Country (UPV/EHU) Spain Dept. of Computer Languages and Systems University of the Basque Country (UPV/EHU) Spain Electronics Division Faculty of Engineering Universidad Autónoma del Estado de Mexico Toluca Mexico Electronics Division Faculty of Engineering UAEM Toluca MEXICO

The IEC61499 is an open standard for distributed control and automation. The interface between control software and hardware or communications is achieved by means of the so-called Service Interface Function Blocks (SIFB). This paper presents the guidelines to build communication SIFBs based on the emerging OMG DDS (Data Distribution Service) middleware. This specification implements in a very efficient way the Publisher/Subscriber paradigm providing significant QoS configuration possibilities. These characteristics make DDS suitable for implementing the communications among time-critical devices. By using these DDS-SIFBs within IEC61499 code generation tools, the designers of the distributed applications will be allowed to use this powerful technology in the new distributed applications.

关键词： IEC standards Middleware Hardware Quality of service Distributed control Software Process control

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An experimental analysis of the effects of noise on Wi-Fi video streaming

An experimental analysis of the effects of noise on Wi-Fi vi...

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IEEE Instrumentation & Measurement Technology Conference

作者： L. Angrisani K. Kyriakopoulos A. Napolitano D. J. Parish M. Vadursi W. Whittow Dept. of Computer Science and Control Systems University of Naples Federico II Dept. of Electronic and Electrical Engineering Loughborough University Dept of Electrical Engineering University of Naples Federico II Dept. of Technologies University of Naples "Parthenope"

ISBN: (纸本)9781424428328;9781424428335

Wireless networks such as WiFi suffer communication performance issues in addition to those seen on wired networks due to the characteristics of the radio communication channel used by their Physical Layers (PHY). Understanding these issues is a complex but necessary task given the importance of wireless networks for the transfer of wide ranging packet steams including video as well as traditional data. Simulators are not accurate enough to allow all the intricacies of such communication to be accurately understood, especially when complex interactions between the protocols of different layers occurs. The paper suggests cross layer measurement as a solution to the problem of understanding and analysis of such complex communication issues and proposes a framework in which appropriate performance measurements can be made from a WiFi network supporting a video streaming application. The framework has been used to collect these measurements at the PHY, MAC, Transport and Application layers. Analysis of the collected measurements has allowed the effects of noise interference at the PHY to be related to the perceived performance at the Application Layer for a video streaming application. This has allowed the effect of the SNR on the download time of a video sequence to be studied.

关键词： Cross-layer measurements Video streaming Wireless networks Wi-Fi

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Linear, time-varying approximations to nonlinear dynamical systems: With applications in control and optimization

Lecture Notes in Control and Information Sciences

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Lecture Notes in control and Information Sciences 2010年 400卷

作者： Tomás-Rodríguez, María Banks, Stephen P. City University London School of Engineering and Mathematical Sciences Northampton Square London United Kingdom University of Sheffield Dept. Automatic Control and Systems Engineering Mappin Street Sheffield United Kingdom

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Hierarchical control of power plants with microgrid operation

Hierarchical control of power plants with microgrid operatio...

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Annual Conference of Industrial Electronics Society

作者： M. Guerrero Josep Juan C. Vásquez Mehdi Savaghebi Jordi de la Hoz Helena Martín Universitat Politecnica de Catalunya Barcelona Catalunya ES Dept. Automatic Control Systems Universitat Politecnica Catalunya (UPC) Barcelona Spain Dept. Electrical Engineering Iran Univ of Science and Techn (IUST) Tehran Iran

Microgrids are key elements to integrate renewable and distributed energy resources as well as distributed energy storage systems. In the last years, efforts toward the standardization of these microgrids have been made. In this sense, this paper presents the hierarchical control which consist of three levels: i) the primary control is based on the droop method, including an output impedance virtual loop; ii) the secondary control allows to restore the deviations produced by the primary control; and iii) the tertiary control manage the power flow between the microgrid and the external electrical distribution system. Results from a hierarchical-controlled microgrid are provided to show the feasibility of the proposed approach.

关键词： Impedance Inverters Voltage control Synchronization Frequency control Reactive power

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An integrated multifunction DC/DC converter for PV generation systems

An integrated multifunction DC/DC converter for PV generatio...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Lin Ma Kai Sun Remus Teodorescu Josep M. Guerrero Xinmin Jin Department of Energy Technology Aalborg University Aalborg Denmark School of Electrical Engineering Beijing Jiao Tong University Beijing China State Key Lab of Power Systems Tsinghua University Beijing China Dept. of Automatic Control Systems and Computer Engineering Universitat Politecnica de Catalunya Barcelona Spain

Due to the stochastic characteristic of photovoltaic (PV) generation, energy storage devices are indispensable to smooth the power flow and provide the electric energy with high quality. In this paper, an integrated DC/DC converter is proposed to realize high performance interfaces for PV array, battery and load. This converter consists of a boost converter for the PV array and a buck/boost converter for the battery, which can realize multifunction including power generation, charge and discharge. The grid-connected and stand-alone operation modes of this converter are analyzed. From this analysis, the control strategies are developed for both modes. A coordination scheme is proposed for the power balance at the stand-alone mode. Simulation and experiments verify the practical feasibility and effectiveness of this multi-function converter.

关键词： Batteries Arrays DC-DC power converters Voltage control Inverters Load flow

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Damping Structure Selection in Nonlinear Ship Manoeuvring Models

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IFAC Proceedings Volumes 2010年第20期43卷 73-78页

作者： Tristan Perez Elías Revestido-Herrero School of Engineering Discipline of Mechanics and Mechatronics The University of Newcastle Callaghan NSW 2308 AUSTRALIA Centre for Ships and Ocean Structures (CeSOS) Norwegian University of Science and Technology (NTNU) Trondheim NORWAY Dept. of Electronic Technology Systems Engineering and Automatic Control University of Cantabria Spain

This paper presents the application of a statistical method for model structure selection of lift-drag and viscous damping components in ship manoeuvring models. The damping model is posed as a family of linear stochastic models, which is postulated based on previous work in the literature. Then a nested test of hypothesis problem is considered. The testing reduces to a recursive comparison of two competing models, for which optimal tests in the Neyman sense exist. The method yields a preferred model structure and its initial parameter estimates. Alternatively, the method can give a reduced set of likely models. Using simulated data we study how the selection method performs when there is both uncorrelated and correlated noise in the measurements. The first case is related to instrumentation noise, whereas the second case is related to spurious wave-induced motion often present during sea trials. We then consider the model structure selection of a modern high-speed trimaran ferry from full scale trial data.

关键词： System Identification Regression Analysis Ship Dynamics Hypothesis Testing

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Surgical Case Identification for an Image-Guided Interventional System

Surgical Case Identification for an Image-Guided Interventio...

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2010 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Tamás Haidegger Peter Kazanzides Balázs Benyó Levente Kovács Zoltán Benyó Dept. of Control Engineering and Information Technology Budapest University of Technology and Economics Budapest Hungary Johns Hopkins University Center for Computer Integrated Surgical Systems and Technology Baltimore MD USA

Image-guided surgery offers great advantages to surgeons through the possibility to track tools in 3D space and to navigate based on the virtual model of the patient. In the case of robot-assisted procedures, both the inherent accuracy of the system components and the quality of the registration procedures are critical to provide high precision treatment delivery. One of the major barriers towards more technology-integrated procedures is the fact that alterations in the operating room environment can fundamentally change the performance of the system, decrease the accuracy, and therefore pose significant danger to the patient. Surgical events from the control point of view may include motion of the robot, motion of the camera, or motion of the patient. The paper describes a new concept to treat these events, to track and automatically compensate for abrupt changes that may affect the accuracy of a robot-integrated interventional system. Our solution is to use all available information at a given time, including the intra-operative tracker's internal base frame, to distinguish between different surgical events. The concept has been developed and tested on the neurosurgical robot system at the Johns Hopkins University. Initial experiments performed on data recordings from simulated scenarios showed that the algorithm was able to correctly identify the cases.

关键词： Surgery Cameras Robot kinematics Robot vision systems Tracking Navigation

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A move-blocking strategy to improve tracking in predictive control

A move-blocking strategy to improve tracking in predictive c...

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American control Conference

作者： G. Valencia-Palomo M. Pelegrinis J.A. Rossiter R. Gondhalekar Department of Automatic Control and Systems Eng. University of Sheffield South Yorkshire UK. S1 3JD Frontier Research Base for Global Young Researcher and Dept. of Mechanical Engineering Osaka University Japan

ISBN: (纸本)9781424474264

One of the advantages of model predictive control is its ability to take optimal account of information about future setpoint changes in the design of the control law. However, it is easy to show that the default optimum GPC (Generalized Predictive control) law that uses this information can lead to a deterioration rather than an improvement in performance. This paper discusses some simple modifications to overcome this problem. Specifically the focus here is on move-blocking approaches which seek to extend the effective input horizon while restricting the number of optimisation variables. A simple algorithm is proposed which allows optimal nominal performance and tracking without the undesirable effects arising from the standard approaches;hence the proposed modification always improves algorithm performance.

关键词： Predictive control tracking Predictive control control law tracking undesirable effects

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Novel Design of Interactive Caption and Recognition Postures within the Wearable and Non-Vision System over Wireless Sensor Network

Novel Design of Interactive Caption and Recognition Postures...

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International Conference on Complex, Intelligent and Software Intensive systems, CISIS

作者： W.T. Huang Chao-Nan Hung Chiu-Ching Tuan Chin-Hsing Chen Yuan-Jen Chang You-Yin Chen Department of Computer Science and Information Engineering Minghsin University of Science and Technology Taiwan R.O.C. Department of Graduate Institute of Computer and Communication Engineering National Taipei University of Technology Taiwan Department of Management Information Systems Central Taiwan University of Science and Technology Taiwan Dept. of Electr. & Control Eng. Nat. Chiao Tung Univ. Hsinchu Taiwan

In this study, we design and present the novel wearable system with the interactive posture caption and recognition functions based on the non-vision over the ZigBee wireless sensor network (ZigBee-WSN). There are two type sensors, 3-axis accelerometer and clip type, to be employed in our wearable system. These sensors are arranged on user's four limbs such that the posture information can be gathered by them. Then, the posture information is transmitted to the data-controlling center over ZigBee-WSN. Finally, this center can analyze and distinguish various postures by our proposed algorithm through the friend user's interface to express. Our presented wearable system can distinguish out 28 kinds of hand postures and 13 kinds of leg postures altogether. Moreover, under our presented ZigBee-WSN system with small size, low-power consumption, and high-reliability characteristics, the data-controlling center can simultaneously tele-monitor the real-time body interactive postures of 8 persons, when the transmitting distance is less than 18 M and the package correct transmitted rate is more than 97.5%.

关键词： Wireless sensor networks Wearable sensors ZigBee Sensor systems Accelerometers Algorithm design and analysis User interfaces Leg Real time systems Packaging

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Low-order model for tokamak plasma current control

Low-order model for tokamak plasma current control

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ICCAS-SICE 2009 - ICROS-SICE International Joint Conference 2009

作者： Garrido, Aitor J. Garrido, Izaskun Sevillano, M. Goretti Amundarain, Modesto Alberdi, Mikel Barambones, Oscar Martija, Itziar Dept. of Automatic Control and Systems Engineering EUITI de Bilbao UPV/EHU Spain Dept. of Automatic Control and Systems Engineering EUI de Vitoria UPV/EHU Spain Dept. of Mechanical Engineering EUITI de Bilbao UPV/EHU Spain

ISBN: (纸本)9784907764296

Nowadays there exists a need of carrying out new features and improvements in the existing and future tokamak devices as ITER or DEMO. The present capabilities of the control engineering and the development of fusion technologies allow the achievement new plasma configurations. These aspects, jointly with the increased performance of the computer hardware and the advances in plasma modelling and control, give a new impulse to the development of models and methods for the design of the scenario. In this sense, the present work is devoted to derive a low-order model of the plasma and surrounding conducting structure with the purpose of facilitating the control requirements in terms of plasma shape and current density profiles. © 2009 SICE.

关键词： Tokamak devices

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