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44th AIAA Aerospace Sciences Meeting 2006

作者： Jankun-Kelly, M. Thompson, D.S. Brewer, W. Jiang, M. Machiraju, R. Mississippi State University Mississippi State MS 39762 United States Fluid Physics International Mississippi State MS 39762 United States Ohio State University Columbus OH 43210 United States Computational Simulation and Design Center Box 9627 United States AIAA United States Department of Aerospace Engineering Drawer A United States PO Box 1361 Department of Computer Science and Engineering 395 Dreese Labs 2015 Neil Avenue United States

ISBN: (纸本)1563478072

In order to understand complex vortical flows in large data sets, we must be able to detect and visualize vortices in an automated fashion. Additionally, an informative vortex visualization should provide more information that just the location of the vortex core. In this paper, we describe a multistage vortex visualization algorithm that attempts to exploit the availability of additional information to convey vortex characteristics such as core position, extent, strength, etc. The results produced by a traditional vortex detection algorithm are enhanced using a set of postprocessing tools. The multistage visualization method can use the results of any field-based vortex detection technique in which the scalar field has an extrema in the vortex core or can use the results of any method which produces a continuous vortex core line. This flexibility allows the user to select a vortex detection algorithm appropriate for the problem at hand. Our method works on unstructured meshes as well as structured grids and avoids the use of the computationally expensive and potentially nonsmooth gradient during core line extraction and characterization. Its ability to discern both weak and strong vortices as well as vortices in close spatial proximity to each other is another advantage which comes from the use of the local extrema method. Further, our method obtains subcell resolution of the vortex core line through the use of function fitting. We demonstrate the efficacy of our approach by applying it to several test cases. These test cases highlight the strengths and weaknesses of the method. We describe how the algorithm can be improved and draw conclusions based on the results presented herein.

关键词： Vortex flow

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Carrier-density evolution in polarization sensitive semiconductor optical amplifiers

Carrier-density evolution in polarization sensitive semicond...

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International Conference on Numerical simulation of Optoelectronic Devices, (NUSOD)

作者： B. S. Gopalakrishna Pillai A. Nirmalathas C. Lim M. Premaratne ARC Special Research Centre for Ultra-Broadband Information Networks Department of Electrical and Electronic Engineering University of Melbourne VIC Australia Advanced computing and simulation laboratory Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We derive analytical expressions for carrier-density evolution along a polarization-sensitive semiconductor optical amplifier (SOA) that have a range of signal processing applications. The analytical results closely m... 详细信息

关键词： Optical polarization Semiconductor optical amplifiers Tellurium Optical signal processing Optical wavelength conversion Optical sensors Optical pulses computer networks Optical computing Systems engineering and theory

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A comparative study on real-time simulation methods for PWM power converters

A comparative study on real-time simulation methods for PWM ...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Gilbert Sybille Hoang Le-Huy Laboratoire Simulation de reséaux lnstitut de Recherche d''Hydro-Québec Varennes QUE Canada Department of Electrical and Computer Engineering Universite Laval QUE Canada

This paper presents a comparative study on various methods developed for real-time simulation of PWM converters. Characteristics and performances of the methods are analyzed and compared based on criteria such as accuracy, execution speed, stability, and implementation complexity. Several examples are presented to validate the analysis results.

关键词： Pulse width modulation Pulse width modulation converters Computational modeling Interpolation Switching converters Circuit simulation Frequency Voltage Performance analysis Stability analysis

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Pulse Propagation in Polarization-sensitive Semiconductor Optical Amplifiers

Pulse Propagation in Polarization-sensitive Semiconductor Op...

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The Joint International Conference on Optical Internet and Next Generation Network (COIN-NGNCON)

作者： Bipin Sankar Gopalakrishnapillai Malin Premaratne David Abramson Ampalavanapillai Nirmalathas Christina Lim Victoria Research Laboratory CUBIN Department of Electrical and Electronic Engineering University of Melbourne VIC Australia Advanced computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia Faculty ofInformation Technology Monash University Clayton VIC Australia

We derive analytical expressions for modal gain, phase evolution, energy gain along a polarization-sensitive semiconductor optical amplifier that have a range of signal processing applications. The analytical results ... 详细信息

关键词： Optical pulses Pulse amplifiers Optical propagation Optical polarization Semiconductor optical amplifiers Tellurium Optical signal processing Optical wavelength conversion Optical sensors Pulse measurements

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Application of the DEVS Framework in Construction simulation 06

Application of the DEVS Framework in Construction Simulation

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simulation Winter Conference

作者： Sivakumar Palaniappan Anil Sawhney Hessam S. Sarjoughian Del E. Webb School of Construction Ira A. Fulton School of Engineering Arizona State University Tempe AZ USA Arizona Center for Integrative Modeling Simulation Department of Computer Science and Engineering Ira A. Fulton School of Engineering Arizona State University Tempe AZ USA

ISBN: (纸本)9781424405015

The discrete event systems specification (DEVS) framework is based on systems engineering principles and is used for modeling and simulation in many application domains. This framework supports a number of important features such as component based hierarchical simulation model development, scalability, reusability and distributed simulation. This paper demonstrates the application of the DEVS framework for construction simulation through a simple, but representative real world application. The application focuses on analyzing the work flow between various trade contractors in production home building. The software tool 'DEVSJAVA' is used for modeling and simulation of the construction application. DEVSJAVA is object oriented; it implements the DEVS framework using Java programming language. This paper consists of three main components: an overview of the state-of-the-art in construction simulation methods and tools, an introduction to the DEVS framework, and a detailed construction example to highlight the application of DEVS framework

关键词： Object oriented modeling Application software Discrete event systems Systems engineering and theory Discrete event simulation Scalability Production Buildings Software tools Java

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Experimental demonstration of a simple time-of-flight rangefinder based on semiconductor optical amplifier

Experimental demonstration of a simple time-of-flight rangef...

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Optical Fiber Communication (OFC) Conference

作者： B.S. Gopalakrishnapillai K.L. Lee A.J. Lowery M. Premaratne S. Shinada N. Wada T. Miyazaki A. Nirmalathas C. Lim Department ofElectrical and Electronics Engineering University of Melbourne Parkville VIC Australia Advanced Computing and Simulation Laboratory AXL Department ofElectrical and Computer Systems Engineering Monash University Clayton VIC Australia Department of Electrical and Electronics Engineering University of Melbourne Parkville VIC Australia Information and Network Systems Department National Institute ofInformation and Communications Technology NICT Incorporated Administrative Agency Koganei Tokyo Japan

We propose a unique design of a time-of-flight laser ranger that detects the distance and reflectivity of a target based on cross-gain modulation between counter-propagating pulses in a semiconductor optical amplifier... 详细信息

ISBN: (纸本)1557528020

关键词： Semiconductor optical amplifiers Pulse amplifiers Optical pulses Optical interferometry Optical receivers Semiconductor lasers Stimulated emission High speed optical techniques Optical sensors Pulse measurements

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Empirical Study on the Effects of Synthetic Social Structures on Teams of Autonomous Vehicles

Empirical Study on the Effects of Synthetic Social Structure...

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IEEE International Conference on Networking, Sensing and Control

作者： A. Campbell A.S. Wu K. Garfield R. Shumaker S. Luke K.A. De Jong School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA Institute for Simulationand Training University of Central Florida Orlando FL 32816 USA Institute for Simulation and Training University of Central Florida Orlando FL USA Department of Computer Science George Mason University Fairfax VA USA

The goal of this research is to explore the effects of social interactions between individual autonomous vehicles (AVs) in various problem scenarios. We take a look at one way to construct the social relationships and generate data from computer simulations to compare the behaviors of each. A difference can be noticed when synthetic social structures (SSS) are used to control the interactions between neighboring AVs. Our experiments show that SSSs can be used to improve team performance on a problem in which a team of AVs must maneuver through a narrow corridor to reach a goal

关键词： Remotely operated vehicles Mobile robots Robot kinematics Intelligent vehicles Autonomous agents computer science computer simulation Information resources Insects Ant colony optimization

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Real-Time simulation of Power Electronics in Power Systems using an FPGA

Real-Time Simulation of Power Electronics in Power Systems u...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： Philippe Le-Huy Sylvain Guerette Louis A. Dessaint Hoang Le-Huy Department of Electrical and Computer Engineering Universite Laval QUE Canada Laboratoire Simulationde reseaux Institut de recherche d''Hydro-Quebec Varennes QUE Canada TransEnergie Chair on Power Systems Simulation and Control Ecolede Technologie Superieure Montreal QUE Canada

Accurate simulation of power electronic converters requires time steps which are too small to be implemented in real-time with conventional processors. This paper describes the use of FPGA hardware for the real-time simulation of power electronic converters. An FPGA computation core implements nodal algorithms to simulate in real time a multiple switch system with a small time step. A dual time step simulation method is also presented and illustrated with a sample three-phase test network. The FPGA computation core simulates a PWM inverter with a 5 mus time step while the non switching part of the system is simulated on a conventional processor operating at 50 mus. The simulated system's dynamic is acceptable and this method yields high precision of the power electronics switching and the modulation scheme

关键词： Power system simulation Real time systems Power electronics Field programmable gate arrays Computational modeling Hardware Pulse width modulation converters computer simulation Power engineering computing Switching converters

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General Active-RC filter model for computer-aided design

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Bulletin of the Polish Academy of Sciences: Technical Sciences 2006年第1期54卷 89-100页

作者： KozieL, S. Szczepański, S. Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton Ont. L8S 4K1 Canada Faculty of Electronics Telecommunications and Informatics Gdańsk University of Technology 11/12 Narutowicza St. Poland

In the paper, a general topology of continuous-time Active-RC filter is presented. The model includes all possible Active-RC filter structures as particular cases and allows us to analyze them using a unified algebraic formalism. This makes it suitable for use in computer-aided analysis and design of Active-RC filters. By its construction, the model takes into account the finite DC gain and the finite bandwidth as well as non-zero output resistance of operational amplifiers. Filters with ideal OPAMPs can be treated as particular cases. Sensitivity and noise analysis of Active-RC filters is also performed in the proposed general setting. The correctness of the model is verified by comparison with SPICE simulation.

关键词： Active filters

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Nonminimum phase output tracking control strategies for DC-to-DC power converters

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Lecture Notes in Control and Information Sciences 2006年 334卷 447-482页

作者： Zinober, Alan Shtessel, Yuri Fossas, Enric Olm, Josep Patterson, Joe Department of Applied Mathematics University of Sheffield Sheffield S10 2TN United Kingdom Department of Electrical and Computer Engineering University of Alabama in Huntsville Huntsville AL 35899 United States Institute of Industrial and Control Engineering Technical University of Catalonia Barcelona 08028 Spain Department of Applied Mathematics IV Technical University of Catalonia Barcelona 08034 Spain Electronics Simulation Analysis and Modeling US Army AMCOM Redstone Arsenal AL 35898 United States

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