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EUROSIM Congress on Modelling and Simulation (EUROSIM)

作者： Alberto de la Calle Luis J. Yebra Sebastián Dormido Automatic Control Group CIEMAT-Plataforma Solar de Almería Tabernas Spain Dept. of Computer Science and Automatic Control UNED Madrid Spain

Falling film evaporators and condensers have demonstrated a good performance in air-conditioning and refrigeration. A study of falling film evaporation and condensation models is presented in this document. Two different evaporator models and a condenser model are being developed considering a trade-off between efficiency and accuracy. These models are based on classical Newton's viscosity law and Nusselt falling film theory. Two libraries, with evaporator and condenser components, compatible with Modelica. Fluid, Modelica. Thermal and Modelica. Media have been implemented. The presented simulations have the expected behaviour. These models will be used to complete a model of a heat pump.

关键词： Electron tubes Heat transfer Mathematical model Libraries Atmospheric modeling Generators Thermodynamics

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Improvements in BondLib, the Modelica Bond Graph Library

Improvements in BondLib, the Modelica Bond Graph Library

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EUROSIM Congress on Modelling and Simulation (EUROSIM)

作者： Alberto de la Calle François E. Cellier Luis J. Yebra Sebastián Dormido Automatic Control Group CIEMAT-Plataforma Solar de Almería Tabernas Spain ETH Zürich Institute of Computational Science Zürich Switzerland Dept. of Computer Science and Automatic Control UNED Madrid Spain

Bond graphs are a natural method for representing power flows in physical systems and they represent the most basic graphical paradigm that is still fully object-oriented. This paper describes a new version of BondLib, the Modelica bond graph library. The library was created for Modelica with graphical Dymola support, and its object-oriented design allows the wrapping of bond graph models offering a user-friendly environment for modeling physical system in multiple energy domains. The new improvements try to reduce the deployment and training cost for end-users by making the error diagnostics easier.

关键词： Mathematical model Connectors Object oriented modeling Libraries Equations Junctions Computational modeling

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Nonlinear control Design for the Photovoltaic Isolated-Port architecture with Submodule Integrated Converters

Nonlinear Control Design for the Photovoltaic Isolated-Port ...

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IEEE Energy Conversion Congress and Exposition

作者： Yoash Levron Daniel Clement Dragan Maksimovic Carlos Olalla Dept. of Electrical Computer and Energy Engineering University of Colorado at Boulder Boulder CO 80309-0425 USA Dept. of Electronic Electrical and Automatic Control Engineering Universitat Rovira i Virgili Tarragona Spain

ISBN: (纸本)9781479903375

Differential power processing (DPP) isolated-port architecture with submodule integrated converters (subMICs) enables improved energy capture in photovoltaic (PV) power systems. This paper describes a control scheme for flyback subMICs operating in discontinuous conduction mode (DCM). The duty-cycle is driven in proportion to a voltage error, with no further processing, thus eliminating the need to measure or to control the current explicitly. The approach is well suited for very simple, analog PWM controller implementation, but the resulting control loops become nonlinear. The system stability is demonstrated using the Lyapunov stability theorem. Experimentally measured module-level efficiency is greater than 95% for a 72-cell PV module having 3 substrings with solar irradiation of 80%, 60% and 40%, respectively.

关键词： respectively stability substrings submodule PHOTOVOLTAIC substring voltage error design control Converters Energy capture control ring System stability solar radiation Solar Irradiance nonlinear control Lyapunov methods Building construction architecture

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Hardware Implementation on FPGA of Two Modulation Techniques for Three Phase Inverters

Hardware Implementation on FPGA of Two Modulation Techniques...

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IEEE International Conference on Intelligent computer Communication and Processing

作者： B. Alecsa A. Onea Dept. of Automatic Control and Computer Engineering Technical University of Iasi

ISBN: (纸本)9781479914920

This paper presents two modern modulation techniques applied to three phase inverters from a hardware implementation point of view. The considered techniques are the sinusoidal pulse width modulation with zero sequence injection and the space vector modulation. Both these techniques conduct to the same result regarding supply voltage usage efficiency and harmonic content of the resulted signals. The implementation was developed in Matlab-Simulink, using the System Generator software, and validated through simulation. Both the modulation algorithms were implemented in hardware on a low cost FPGA, and the resulted designs are compared for resource usage efficiency, obtained speed and easiness of integration within a complex AC drive control system.

关键词： Sinusoidal PWM ZSS SVM FPGA System Generator

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Development of parallel manipulator sit to stand assistive device for elderly people

Development of parallel manipulator sit to stand assistive d...

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2013 IEEE Workshop on Advanced Robotics and Its Social Impacts, ARSO 2013

作者： Salah, Omar Asker, Ahmed Fath El-Bab, Ahmed M. R. Assal, Samy M. F. Ramadan, Ahmed A. Sessa, Salvatore Abo-Ismail, Ahmed Egypt-Japan University of Science and Technology New Borg-El-Arab city Alexandria Egypt Mechanical Engineering Department Faculty of Engineering Assiut University Egypt Department of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Alexandria Egypt Computer and Automatic Control Dept. Faculty of Engineering Tanta University Tanta Egypt Mechatronics and Robotics Dept. Egypt-Japan University of Science and Technology Egypt School of Creative Science and Engineering Waseda University Tokyo 168-8480 Japan

ISBN: (纸本)9781479923694

This paper describes a novel mobility assistive device under development in the Egypt-Japan University of Science and Technology (E-JUST). The proposed system can help patients who do not have enough physical strength on the lower limbs during sit to stand due to aging, diseases such as polymyositis and myopathy, and joint replacement surgery complications. It can follow the natural pattern of human motion during sit to stand providing assistance force under the shoulder. The overall device is compact and employees a parallel mechanism which provide more stiffness. Several experiments were carried out in a VICON room to calculate the human motion posture while sit to stand motion in addition estimate the trajectory of the end effector during assisting. computer simulation was built to verify the performance of the proposed system with the reference trajectory. © 2013 IEEE.

关键词： Mechanisms

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A dynamic uplink scheduling scheme for WiMAX networks

A dynamic uplink scheduling scheme for WiMAX networks

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International Conference on computer Engineering and Systems

作者： Nada M. El-Shennawy Mohamed N. El-Derini Mostafa A. Youssef Mahmoud M. Fahmy Computers and Automatic Control Dept. Tanta University Tanta Egypt Computer Science and Engineering E-JUST Alexandria Egypt Vice Rector for Education and Student Affairs Pharos University Alexandria Egypt

Over the past few years, there has been a rapid growth of new services such as online video games, video conferences, and multimedia services to end users. WiMAX is an emerging technology for next generation wireless networks which supports a large number of users. To achieve Quality of Service (QoS) requirements, an efficient and reliable scheduling algorithm is urgently needed. Among a large number of the proposed approaches in the literature, a variably weighted round robin scheduling algorithm (VWRR) has been proven to provide the best performance in an IP backbone network with no attempts on WiMAX networks. This paper proposes a dynamic uplink scheduling algorithm for WiMAX networks based on VWRR to allocate the bandwidth to users to maximize the throughput and ensure the constraints of delay, jitter, and load. A comparative study between the proposed scheduling algorithm and the two most famous scheduling algorithms: weighted round robin algorithm (WRR) and modified deficit round robin algorithm (MDRR) over WiMAX networks, is presented. Simulation results obtained using OPNET reveal that the proposed algorithm has a superior performance compared with WRR with respect to throughput, delay, jitter, and load. Additionally, the proposed scheduling algorithm is shown to provide an excellent level of reliability and scalability when increasing the number of served subscriber stations.

关键词： WiMAX Uplink Quality of service Round robin Throughput Bandwidth

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Structured coprime factorizations description of Linear and Time-Invariant networks

Structured coprime factorizations description of Linear and ...

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IEEE Conference on Decision and control

作者： Şerban Săbau Cristian Oară Sean Warnick Ali Jadbabaie Stevens Institute of Technology Hoboken NJ US Faculty of the Automatic Control Dept. University “Politehnica” Bucharest Romania The Faculty of the Computer Science Department Brigham Young University Faculty of the Electrical and Systems Engineering Dept University of Pennsylvannia

In this paper we study state-space realizations of Linear and Time-Invariant (LTI) systems. Motivated by biochemical reaction networks, Gonçalves and Warnick have recently introduced the notion of a Dynamical Structure Functions (DSF), a particular factorization of the system's transfer function matrix that elucidates the interconnection structure in dependencies between manifest variables. We build onto this work by showing an intrinsic connection between a DSF and certain sparse left coprime factorizations. By establishing this link, we provide an interesting systems theoretic interpretation of sparsity patterns of coprime factors. In particular we show how the sparsity of these coprime factors allows for a given LTI system to be implemented as a network of LTI sub-systems. We examine possible applications in distributed control such as the design of a LTI controller that can be implemented over a network with a pre-specified topology.

关键词： Transfer functions Equations Indium phosphide Mathematical model Network topology Topology Electronic mail

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A comparative study of digital IMC and RST regulators applied on a wind turbine

UPB Scientific Bulletin, Series C: Electrical Engineering

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UPB Scientific Bulletin, Series C: Electrical Engineering 2012年第4期74卷 27-38页

作者： Pintea, Andreea Popescu, Dumitru Dept. of Automatic Control and Computer Science Politehnica University Bucharest Romania

This paper presents a comparative study of two well known regulation algorithms designed for a horizontal variable wind speed turbine functioning in the above rated wind speed regime. Typical control in this working regime uses pitch regulation to maintain constant the turbine's rotor speed while the generator toque is held constant. This will be also the approach chosen for this study. The goal of the paper is to demonstrate the efficiency of the two algorithms in controlling the electrical output power by means of applying them on a simplified model of a wind turbine. The obtained results will be analyzed and presented through a few simulations. Copyright © 2009 Universitatea Politehnica Bucuresti.

关键词： Wind turbines

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A WSN based monitoring system for oil and gas transportation through pipelines

A WSN based monitoring system for oil and gas transportation...

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14th IFAC Symposium on Information control Problems in Manufacturing, INCOM'12

作者： Junie, Petru Dinu, Octav Eremia, Cristian Stefanoiu, Dan Petrescu, Catalin Savulescu, Ioan Politehnica University of Bucharest Dept. of Automatic Control and Computer Science 313 Splaiul Independentei Bucharest-060042 Romania Oil and Gas University of Ploiesti Dept. of Drilling and Extraction 39 Bucuresti Blvd. Ploiesti-100680 Romania

ISBN: (纸本)9783902661982

This article introduces some results obtained in monitoring of long pipelines employed in oil and gas transportation. A mobile unit for signals acquisition, processing, identification and diagnosis (MUSAPID), based on wireless sensors networks (WSN) technology was employed. The MUSAPID architecture was adapted to match the configuration of monitoring system, inspired by the national energy dispatcher. Thus, the system includes four hierarchical levels assigned to: the central dispatcher, the zonal dispatcher, the local dispatcher and the sensor nodes. The sensors are acquiring the flow and temperature of oil from the monitored pipeline. Sensors distribution along the pipeline is of in-line type. Nevertheless, a cross-link schema between sensor nodes is proposed, in order to increase the exploitation safety and to reduce false alarms sending. Two independent monitoring approaches based on comparison between values of sensors in pairs of successive nodes allow controlling the occurrence of rifts and leaks in the pipeline network. One of the approaches is unconventional and uses inter-correlation between the data acquired from two successive sensor nodes, as well as auto-correlation of temperature data. A simple logic to avoid sending false alarms was also implemented. © 2012 IFAC.

关键词： Sensor nodes

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Fast exemplar-based image inpainting approach

Fast exemplar-based image inpainting approach

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2012 International Conference on Machine Learning and Cybernetics, ICMLC 2012

作者： Wang, Hui-Qin Chen, Qing Hsieh, Cheng-Hsiung Yu, Peng Information and Control Engineering College Xi'an University of Architecture and Technology Xi'an 710055 China Dept. of Computer Science and Information Engineering Chaoyang University of Technology Taichung 41349 Taiwan

ISBN: (纸本)9781467314855

This paper presents a way to improve the computation efficiency of exemplar-based inpainting approach in [4]. Note that the inpainting approach in [4] has computation redundancy in searching optimal patches in source region and updating fill front. A scheme to reduce source region and a modified scheme to update fill front are proposed. With the two schemes, better computation efficiency is expected. Several examples are given to justify the proposed fast inpainting approach and used to compare with the approach in [4]. The results indicate that the proposed approach has better computation efficiency than the approach in [4], as expected. Interesting enough, better visual quality of inpainted images is achieved by the proposed approach as well. © 2012 IEEE.

关键词： Computational efficiency

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