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LQG control of horizontal wind turbines for blades and tower loads alleviation

LQG control of horizontal wind turbines for blades and tower...

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作者： Pintea, A. Christov, N. Popescu, D. Borne, P. Automatic Control and Computer Science Faculty University 'Politehnica' of Bucharest 60042 Bucharest Romania Université Lille 1 Sciences et Technologies 59651 Villeneuve d'Ascq France Ecole Centrale de Lille 59651 Villeneuve d'Ascq France

ISBN: (纸本)9783902661937

The paper deals with the LQG controller design optimizing the amount of power produced by two bladed horizontal variable speed wind turbines. The proposed controller ensures not only an optimal operation of turbines but also enables a compromise with the minimization of the blade oscillations and with the tower bending tendency. © 2011 IFAC.

关键词： controllers

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ORF-MOSAIC for adaptive control of a biomimetic arm

ORF-MOSAIC for adaptive control of a biomimetic arm

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2011 IEEE International Conference on Robotics and Biomimetics, ROBIO 2011

作者： Ardakani, M. Mahdi Ghazaei Jörntell, Henrik Johansson, Rolf Department of Computer Science Faculty of Engineering Lund University 221 00 Lund Sweden Department of Experimental Medical Sciences Lund University Biomedical Center F10 221 84 Lund Sweden Department of Automatic Control Faculty of Engineering Lund University 221 00 Lund Sweden

ISBN: (纸本)9781457721373

This study is an attempt to take advantage of a cerebellar model to control a biomimetic arm. The cerebellar controller is a modified MOSAIC model which adaptively controls the arm. We call this model ORF-MOSAIC (Organized by Receptive Fields MOdular Selection And Identification for control). The arm features a musculoskeletal model which is controlled through muscle activations by means of optimization techniques. With as few as 16 modules, we were able to control the arm in a workspace of 30 x 30 cm. The system was able to adapt to an external field as well as handling new objects despite delays. The discussion section suggests that there are similarities between the microzones in the cerebellum and the modules of this new model. © 2011 IEEE.

关键词： Biomimetics

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Partitioning methods used in DBS treatments analysis results

Partitioning methods used in DBS treatments analysis results

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International Joint Conference on Neural Networks (IJCNN)

作者： Oana Geman Cornel Turcu Department of Automatic Control and Computers Faculty of Electrical Engineering and Computer Science University Stefan cel Mare of Suceava Suceava Romania

Parkinson's disease is a neurodegenerative disorder and is associated with motor symptoms, including tremor. The DBS (Deep Brain Stimulation) involves electrode implantation into subcortical structures for long-term stimulation at frequencies greater than 100Hz. The mechanism by which chronic, electrical Deep Brain Stimulation with high frequency, suppresses tremor in Parkinson's disease is unknown, but might involve a gradual change in network properties controlling the generation of tremor. First, we performed linear and nonlinear analysis of the tremor signals to determine a set of parameters and rules for recognizing the behavior of the investigated patient and to characterize the typical responses for several forms of DBS. Second, we found patterns for homogeneous group for data reduction. We used Data Mining and Knowledge discovery techniques to reduce the number of data. Then, we found "clusters" the most well-known used and commonly partitioning methods used: K-means and K-medoids. To support such predictions, we develop a model of the tremor, to perform tests determining the DBS reducing the tremor or inducing tolerance and lesion if the stimulation is chronic.

关键词： Satellite broadcasting Clustering algorithms Time series analysis Correlation Algorithm design and analysis Mathematical model Software algorithms

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Advanced control technique application in U-tube steam generator of nuclear power station

Advanced control technique application in U-tube steam gener...

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2011 International Conference on computer Engineering and Systems, ICCES'2011

作者： Mousa, Hamdi M. El-Araby, Sayed M. Koutb, Magdy A. Ali, Elsayed H. M. Menoufia University Faculty of Computers and Information Department of Computer Science Shbien Elkoom Egypt Egyptian Atomic Energy Authority Nuclear Research Center Department of Engineering and Scientific Instruments Cairo Egypt Menoufia University Faculty of Electronic Engineering Department of Industrial Electronics and Control Menouf Egypt

ISBN: (纸本)9781457701283

A water level control system for a nuclear steam generator (SG) is proposed. A method to improve the performance of nuclear steam generator in nuclear power station is introduced. Combination of genetic algorithm (GA) technique and fuzzy logic control is carried out. The optimal parameters of fuzzy logic controller are achieved. These parameters include;the membership functions of water level error and changes water level error, the rule base, and the input scaling gains. Steam generator model is implemented using MATLAB/SIMULINK. The optimal controller was applied to control the water level of nuclear SG and it's compared with conventional controller. Simulation results indicate that the optimal fuzzy controller greatly improves the performance of nuclear SG. Moreover the proposed controller is robust to any disturbance related to sudden changes in steam flow rate and water level. Moreover the proposed controller is robust to any disturbance related to load variations. © 2011 IEEE.

关键词： Water levels

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ORF-MOSAIC for Adaptive control of a Biomimetic Arm

ORF-MOSAIC for Adaptive Control of a Biomimetic Arm

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IEEE International Conference on Robotics and Biomimetics

作者： M. Mahdi Ghazaei A. Henrik Jorntell Rolf Johansson Department of Computer Science Faculty of Engineering Lund University Department of Experimental Medical Sciences Section for Neurophysiology Lund University Department of Automatic Control Faculty of Engineering Lund University

ISBN: (纸本)9781457721366

This study is an attempt to take advantage of a cerebellar model to control a biomimetic arm. The cerebellar controller is a modified MOSAIC model which adaptively controls the arm. We call this model ORF-MOSAIC (Organized by Receptive Fields MOdular Selection And Identification for control). The arm features a musculoskeletal model which is controlled through muscle activations by means of optimization techniques. With as few as 16 modules, we were able to control the arm in a workspace of 30×30 cm. The system was able to adapt to an external field as well as handling new objects despite delays. The discussion section suggests that there are similarities between the microzones in the cerebellum and the modules of this new model.

关键词： Arm spiral arm adaptive control Cerebellum Biomimetics external electric field Workplace Standing Orders Epicoccum

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Eye tracking based communication system for patient with major neoro-locomotor disabilites

Eye tracking based communication system for patient with maj...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Robert G. Lupu Radu G. Bozomitu Florina Ungureanu Vlad Cehan Faculty of Automatic Control and Computer Engineering Gh. Asachi Technical University of Iasi Romania Faculty of Electronics Telecommunications and Information Technology Gh. Asachi Technical University of Iasi Romania

This paper presents a new technology used for communicating with people with major neuro-locomotor disability by determining gaze direction on a monitor screen. Gaze direction is determined by pupil position through image analysis. The proposed communication technology ensures communication with the patient as follows: (1) on a monitor screen divided in four sections are displayed key words and corresponding ideograms; (2) the patient sees the key words and focuses his/her gaze on a certain section - a pointer allows the control of gaze direction; (3) an infra-red mini/micro video camera placed on the patient's head sends the image of the eye to a computer; (4) the focusing of the patient's gaze on a certain key word i.e. a certain section of the screen is identified by image analysis; (5) voluntary blinking, also objectified by image analysis, shows the selection of a certain word. The patient's wish or need, represented by the key word, is then sent to a server and from there to a caretaker by means of a wire or a wireless transmission system. The absence of a selection within a certain time period causes the displaying of a new set of ideograms. The new technology is useful in the case of the patients who cannot communicate verbally, through signs or in writing and is based on their ability to control eye movement, which is often the case with people with major locomotor disabilities.

关键词： Servers computers Tracking Educational institutions Facsimile Protocols

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Design methods of multithreaded architectures for multicore microcontrollers

Design methods of multithreaded architectures for multicore ...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Horia V. Caprita Mircea Popa Computer Science and Automatic Control Department Lucian Blaga University of Sibiu Sibiu Romania Faculty of Automation and Computers Polytechnic University of Timisoara Timisoara Romania

The development of electronic technology today has allowed the implementation of complex architectures, which led to the emergence of multicore processors technology. Multicore architectures are built from superscalar and multithreaded processors. Integrating new technologies in embedded applications requires the development of multicore processors that can be integrated into a smaller area like a classic microcontroller. These processors must manage fewer resources and be able to manage multiple tasks simultaneously. In this paper we present a method of modeling, simulation and evaluation of two multithreaded architectures with limited resources, which could be integrated into embedded systems: Interleaved multithreading (IMT) and Blocked multithreading (BMT). Both techniques permit the processing of multiple independent threads, concurrently. In this paper we propose a SimpleScalar Interleaved Multithreading architecture (SS-IMT) and a SimpleScalar Blocked Multithreading architecture (SS-BMT) that are derived from SimpleScalar simulator. We will evaluate the performances of these architectures compared to the performance of standard SimpleScalar architecture.

关键词： Context Instruction sets computer architecture Registers Multithreading Benchmark testing

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Gradient-based classification and representation of features from volume data

Gradient-based classification and representation of features...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Marius Gavrilescu Vasile Manta Eduard Gröller Technical University of Iasi Romania Vienna University of Technology Austria Faculty of Automatic Engineering and Computer Control Technical University of Iasi Romania Computer Science Department University of Bergen Norway

The extraction and representation of information from volume data are important research avenues in computer-based visualization. The interpretation of three- or multi-dimensional data from various scanning devices is important to medical imaging, diagnosis and treatment, reliability and sustainability analyses in various industrial branches, and, in more general terms, information visualization. In this paper, we present several approaches for the classification and representation of relevant information from volume data sets. The techniques are based on the gradient vector, a property directly derived from the original volume data. We show how this property can be computed and subsequently used for classification through gradient-based one- and multi-dimensional transfer functions, as well as for the enhancement of surface features. The described techniques are illustrated through images generated using our volume rendering framework, from Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) data sets. The resulting images show how gradient-based techniques are suited for improved volume classification and the better extraction of meaningful information.

关键词： Transfer functions Image color analysis Rendering (computer graphics) Computed tomography Magnetic resonance imaging Skin Support vector machine classification

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Comparison Study between a Simple Sensorless Method and Adaptive Observer for DTC-SVM Five-Phase Induction Motor Drive

Comparison Study between a Simple Sensorless Method and Adap...

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IEEE Interantional Conference on Industrial Technology

作者： B. S. Khaldi H. Abu-Rub A. Iqbal R. Kennel M. O. Mahmoudi D. Boukhetala Department of Electrical Engineering Faculty of Science and Engineering Djelfa University Algeria Department of Electrical & Computer Engineering Texas A&M University at Qatar Doha Qatar Department of Electrical Engineering College of Engineering Qatar University Qatar Institute for Electrical Drive Systems and Power Electronics Technische Universitat Munchen Munich Germany Laboratory of Process Control National Polytechnic School Algiers Algeria

ISBN: (纸本)9781467303408;9781467303422

This paper highlights the differences between a simple sensorless method and an adaptive flux and speed observer for a five-phase induction motor control. The drive is controlled using space vector modulation direct torque control (DTC- SVM) approach. The power measurement used for speed computation is simple, with a minimum processor time and memory, and relatively robust against parameters variation when compared with the adaptive observer based approach. Simulation verification and real time implementation are presented in the paper.

关键词： direct torque control (DTC) space vector modulation (SVM) Five-phase induction machine speed sensorless power measurement adaptive observer

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Monitoring and control of liquid nitrogen level of the 13C separation column using NI PXI-1031

Monitoring and control of liquid nitrogen level of the 13C s...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： A.O. Neaga C. Festila E. H. Dulf R. Both T. Szelitzky M. Gligan Department of Automatic Control Faculty of Automation and Computer Science Technical University of Cluj Napoca Cluj-Napoca Romania National Institute for Research and Development of Isotopic and Molecular Technologies Cluj-Napoca Romania

This paper is a step forward by making real time control system design to monitor and control process variables to ensure its smooth operation and desired reliability. Liquid nitrogen level in the condenser is a core component of isotopic separation process to obtain ( 13 C), so is needed a special focus on monitoring and control. The goal of the work is to design a controller for the liquid nitrogen in the condenser of ( 13 C) isotope separation column using NI-PXI 1031 (PCI eXtensions for Instrumentation) from National Instruments. The designed ON-OFF controller is implemented in LabVIEW and are discussed the advantages and disadvantages.

关键词： Nitrogen Nickel Monitoring Isotopes Valves Instruments Resistance

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