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IEEE International Symposium on Industrial Electronics

作者： Alonso, Marta Fluerta, Francisco Giron, Carlos Bueno, Emilio Hernandez, Alvaro Rodriguez, Francisco J. Cobreces, Santiago Univ Alcala de Henares Dept Elect Madrid Spain

ISBN: (纸本)9781424407545

New energy concepts such as Distributed Power Generation are changing the face of electric distribution and transmission. Power electronics researchers try to apply new electronic controller solutions enabling the implementation of new and more complex control algorithms. This paper presents the design, implementation and test of the Field-Program m able Gate Array (FPGA) tasks of a novel real-time controller for a NPC (Neutral Point Clamped) (three-level) multilevel converter. The controller is based on a floating-point Digital Signal Processor (DSP) and a FPGA, by operating in a cooperative way. The proposed system is instantiated to the next system: a 150 kVA back-to-back three-level NPC VSC (Voltage Source Converter) for wind turbine applications.

关键词： Industrial control systems back-to-back distributed power generation alternative energy computer algorithms Wind Energy Conversion Systems three-level

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Genetic programming-based controller design

Genetic programming-based controller design

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IEEE Congress on Evolutionary Computation

作者： Sekaj, I. Perkacz, J. Slovak Tech Univ Bratislava Inst Control & Ind Informat Fac Elect Engn & Informat Technol Bratislava 81219 Slovakia

ISBN: (纸本)9781424413393

Two genetic programming-based approaches are proposed for continuous-time process control design. The first approach uses a network of interconnected continuous-time elementary dynamic building blocs with a specific table-based representation of individuals. In the second approach the control algorithm is represented as a recurrent function of discrete-time variables with the tree representation of individuals. Both approaches are demonstrated on controller design examples, which are compared with the genetic algorithm-based PID controller design.

关键词： controller design Genetic Algorithm (GA) computer algorithms time variable Process control Controllers

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Predictive direct torque control for Brushless Doubly Fed Machine with reduced torque ripple at constant switching frequency

Predictive direct torque control for Brushless Doubly Fed Ma...

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IEEE International Symposium on Industrial Electronics

作者： Sarasola, Izaskun Poza, Javier Rodriguez, Miguel Angel Abad, Gonzalo Univ Mondragon Fac Engn Arrasate Mondragon 20500 Spain

ISBN: (纸本)9781424407545

In this paper, a predictive Direct Torque Control strategy with constant switching frequency of Brushless Doubly Fed Machine is presented. Firstly, the classical Direct Torque Control strategy for Brushless Doubly Fed Machine has been developed, obtaining the voltage vector table. The vector voltage table has been developed analyzing the flux and torque derivates for each voltage vector as a function of control winding flux angle. In order to employ constant switching frequency, predictive Direct Torque Control is applied. Reduced torque ripple strategy has been implemented to improve the behavior at constant switching frequency. Simulation results show effectiveness of the proposed control algorithm.

关键词： torque ripple voltage vector direct torque control Switching frequency brushless Torque control computer algorithms Constants machine

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Robust wireless image communications using combined SPIHT/OFDM technique

Robust wireless image communications using combined SPIHT/OF...

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IEEE Pacific Rim Conference on Communications, computers and Signal Processing

作者： Abdelaleem, Onsy Khedr, Mohamed Sharkas, Maha Almaghrabi, A. Univ Alexandria Fac Engn Alexandria Egypt Arab Acad Sci & Technol Dept Elect & Commun Engn Alexandria Egypt

ISBN: (纸本)9781424411894

In this paper, we propose a combined SPIHT/OFDM coding scheme for transmission of image/video over wireless fading channels. The proposed system implements a rate control algorithm as the image coding scheme and an adaptive modulation OFDM system as the communication coding scheme. We evaluate the system over uncorrelated Rayleigh fading channel. Simulation results for Peak Signal-to-Noise Ratio (PSNR) of the received image at different rates are presented which demonstrate the contribution of our algorithm over this challenging channel.

关键词： labeling scheme Peak signal-to-noise ratio wireless computer algorithms image coding method algorithms Raleigh fading channels adaptive modulation rate control Fading channels

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Control of stator winding slot cooling by water using prediction of heating

Control of stator winding slot cooling by water using predic...

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IEEE International Conference on Mechatronics

作者： Vlach, Radek Grepl, Robert Krejci, Petr Brno Univ Technol Inst Solid Mech Mechatron & Biomech Brno 61669 Czech Republic

ISBN: (纸本)9781424411832

This project is concerned with non-convectional direct stator winding slot cooling using water. The aim is to find optimal algorithm for control of water cooling. The control algorithms are tested on the experimental device, which is part of real synchronous machine with permanent magnets. The thermal model was built as a base for pump control algorithm model of a machine without thermal sensors. The Thermal model is possible used as predictor of machine heating in real time. This type of water cooling shows better effect on the machine heating than common water cooling system on the cover.

关键词： Heating computer algorithms Water cooling Stator windings machine Optimization algorithms Water utilization experimental devices thermal model Water cooling systems

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Closed-loop torque control of an absorbing dynamometer for a motor test-bed

Closed-loop torque control of an absorbing dynamometer for a...

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IEEE International Symposium on Industrial Electronics

作者： Campos-Delgado, D. U. Espinoza-Trejo, D. R. Palacios, E. UASLP Fac Ciencias San Luis Potosi SLP Mexico UASLP CIEP Fac Ingn San Luis Potosi SLP Mexico

ISBN: (纸本)9781424407545

In order to test control algorithms for DC and AC motors, under a variable speed configuration, is necessary to provide a regulated load torque. Moreover, it is desirable to adjust on-line this quantity in order to simulate practical scenarios and nonlinear loads. Thus, with this objective in mind, the design and closed-loop torque control strategies for an absorbing dynamometer are detailed in this paper. This device is constructed using a permanent-magnet DC motor and a two-quadrant DC-DC chopper, and it is designed to operate independently of the motor velocity orientation. Two nonlinear control schemes are presented to regulate accurately the torque provided by the dynamometer. Finally, simulation and experimental results are illustrated for a 2HP DC motor test-bed.

关键词： Dynamometer AC motors Torque control loading moments DC chopper Absorption (physics) computer algorithms order Motor

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A new control algorithm for robot with joint flexibility

A new control algorithm for robot with joint flexibility

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IEEE Conference on Control Applications

作者： Sauer, Piotr Kozlowski, Krzysztof Poznan Tech Univ Chair Control & Syst Engn PL-60965 Poznan Poland

ISBN: (纸本)9781424404421

This paper considers a new control algorithm for robot with elastic joints. The proposed algorithm requires only position signals measurements. This algorithm is an extension of the control algorithm proposed by Loria and Ortega in [10]. We have assumed that model in [10] has in addition dynamic friction components on both link and motor sides. We have incorporated harmonic drives into our system. We have developed for the proposed model of manipulator an adaptive version of the control algorithm based on Lyapunov stability theory. This algorithm ensures that the tracking error posses desirable convergence property: semiglobal convergence to an arbitrarily small neighbourhood of zero in the presence of bounded disturbance.

关键词： computer algorithms Robot Joint Flexibility

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Traffic Engineering using Multipath Routing Approaches

Traffic Engineering using Multipath Routing Approaches

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作者： Mazandu, Gaston Kuzamunu Stellenbosch University

学位级别：master

Thesis (MSc (Mathematical Sciences. computer Science))?– University of Stellenbosch, 2007.%%%%It is widely recognized that Traffic engineering (TE) mechanisms have to be added to the IPtransport functionalities to provide QoS guarantees while ensuring efficient use of networkresources. Traffic engineering is a network management technique which routes traffic towhere bandwidth is available in the network to achieve QoS agreements between currentand future demands and the available network resources. Multi-path routing has beenproven to be a more efficient TE mechanism than Shortest Path First (SPF) routing interms of proffit maximization and resource usage optimization. However the identifficationof set of paths over which traffic is forwarded from source to the destination and thedistribution of traffic among these paths are two issues that have been widely addressedby the IP community but remain an open issue for the emerging generation IP *** upon different frameworks, this thesis revisits the issue of multi-path routing topresent and evaluate the performance of different traffic splitting mechanisms to achieveQoS routing in Multi-Protocol Label Switching (MPLS) and Wireless Sensor Networks(WSNs). Three main contributions are identified in this thesis. First, we extend an optimizationmodel that used the M/M/1 queueing model on a simple network consistingof a single source-destination pair by using the M/M/s queueing model on a general networkconsisting of several source-destination pairs. The model solves a multi-path routingproblem by defining a Hamiltonian as a function of delay incurred and subjecting thisHamiltonian to Pontryagin''s cost minimization to achieve efficient diffusion of traffic overthe available parallel paths. Second, we revisit the problem of cost-based optimization ina multi-path setting by using a Game theoretical framework to propose and evaluate theperformance of competitive and cooperative multi-path routing schemes and the

关键词： Telecommunication ?– Traffic ?– Management Wireless communication systems computer network protocols computer algorithms Mathematical Sciences computer Science

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Aplicativo computacional para obtenção de probabilidades a priori de classificação errônea em experimentos agronômicos

Aplicativo computacional para obtenção de probabilidades a...

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作者： Padovani, Carlos Roberto Universidade Estadual Paulista

Nas Ciências Agronômicas, encontram-se várias situações em que são observadas diversas variáveis respostas nas parcelas ou unidades experimentais. Nestas situações, um caso... 详细信息

Nas Ciências Agronômicas, encontram-se várias situações em que são observadas diversas variáveis respostas nas parcelas ou unidades experimentais. Nestas situações, um caso de interesse prático à experimentação agronômica é o que considera a construção de regiões de similaridade entre as parcelas para a discriminação entre os grupos experimentais e ou para a classificação de novas unidades experimentais em uma dessas regiões. Os métodos de classificação ou discriminação exigem, para sua utilização prática, uma quantidade considerável de retenção de informação da estrutura de variabilidade dos dados e, principalmente, alta fidedignidade e competência nas alocações de novos indivíduos nos grupos, mostradas nas distribuições corretas destes indivíduos. Existem vários procedimentos para medir o grau de decisão correta (acurácia) das informações fornecidas pelos métodos classificatórios. Praticamente, a totalidade deles utilizam a probabilidade de classificação errônea como o indicador de qualidade, sendo alguns destes freqüentistas (probabilidade estimada pela freqüência relativa de ocorrências - métodos não paramétricos) e outros baseados nas funções densidade de probabilidade das populações (métodos paramétricos). A principal diferença entre esses procedimentos é a conceituação dada ao cálculo da probabilidade de classificação errônea. Pretende-se, no presente estudo, apresentar alguns procedimentos para estimar estas probabilidades, desenvolver um software para a obtenção das estimativas considerando a distância generalizada de Mahalanobis como o procedimento relativo à da função densidade de probabilidade para populações com distribuição multinormal . Este software será de acesso livre e de fácil manuseio para pesquisadores de áreas aplicadas, completado com o manual do usuário e com um exemplo de aplicação envolvendo divergência genética de *** the Agronomical Sciences, mainly in studies involving biomass production and rational use of energy, there are sev

关键词： Estruturas de dados (Computação) Algoritmos de computador Função discriminante linear Analise multivariada Distância de Mahalanobis Multivariate analysis Linear discriminant function computer algorithms Tese de doutorado

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Reverse engineering nature

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computer GRAPHICS FORUM 2007年第3期26卷 XVII-XVII页

作者： Jensen, Henrik Wann Univ Calif San Diego San Diego CA 92103 USA

Why is the sky blue? Why is grass green? What determines the color of human skin? Questions such as these are increasingly important in the development of the next generation algorithms for appearancemodeling in computer graphics. By closely simulating the natural world around us we can develop algorithms that are useful in areas not traditionally connected with computer graphics. An example could be the ability to predict the color of human skin in the presence of certain diseases. In this talk, I will describe some of our recentwork in simulating the appearance of materials such as human skin, milk, and ice. This includes new research for predicting the appearance of materials based on their molecular structure in order to answer the question: “what will it look like if I mix these molecules together”? [ABSTRACT FROM AUTHOR]

关键词： computer algorithms algorithms computer graphics computer drawing computer simulation DIGITAL image processing

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