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51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

作者： Nguyen, Nhan Trinh, Khanh Reynolds, Kevin Kless, James Aftosmis, Michael Urnes, James Ippolito, Corey NASA Ames Research Center Intelligent Systems Division Moffett Field CA 94035 United States Stinger Ghaffarian Technologies Inc Intelligent Systems Division Moffett Field CA 94035 United States Science and Technology Corp Systems Analysis Branch Moffett Field CA 94035 United States Boeing Research and Technology Platform Systems/Subsystems Technology St. Louis MO 63166 United States Applied Modeling and Simulation Branch United States

ISBN: (纸本)9781624101816

This paper presents the findings of a study conducted in 2010 by the NASA Innovation Fund Award project entitled "Elastically Shaped Future Air Vehicle Concept". The study presents three themes in support of meeting national and global aviation challenges of reducing fuel burn for present and future aviation systems. The first theme addresses the drag reduction goal through innovative vehicle configurations via non-planar wing optimization. Two wing candidate concepts have been identified from the wing optimization: a drooped wing shape and an inflected wing shape. The drooped wing shape is a truly biologically inspired wing concept that mimics a seagull wing and could achieve about 5% to 6% drag reduction, which is aerodynamically significant. From a practical perspective, this concept would require new radical changes to the current aircraft development capabilities for new vehicles with futuristic-looking wings such as this concept. The inflected wing concepts could achieve between 3% to 4% drag reduction. While the drag reduction benefit may be less, the inflected-wing concept could have a near-term impact since this concept could be developed within the current aircraft development capabilities. The second theme addresses the drag reduction goal through a new concept of elastic wing shaping control. By aeroelastically tailoring the wing shape with active control to maintain optimal aerodynamics, a significant drag reduction benefit could be realized. A significant reduction in fuel burn for long-range cruise from elastic wing shaping control could be realized. To realize the potential of the elastic wing shaping control concept, the third theme emerges that addresses the drag reduction goal through a new aerodynamic control effector called a variable camber continuous trailing edge flap. Conventional aerodynamic control surfaces are discrete independent surfaces that cause geometric discontinuities at the trailing edge region. These discontinuities promote vort

关键词： Drag reduction

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Impact of integrated product team course on skill development and workplace preparation for graduating engineering seniors

Impact of integrated product team course on skill developmen...

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119th ASEE Annual Conference and Exposition

作者： Smith, Derrick Wayne Dillihunt, Monica Letrece Farrington, Phillip A. Benfield, Michael P.J. Turner, Matthew William Department of Education University of Alabama Huntsville United States University of Alabama Huntsville United States Department of Industrial and Systems Engineering and Engineering Management University of Alabama Huntsville United States Center for Modeling and Simulation Analysis Industrial and Systems Engineering and Engineering Management Department UAH Campus United States

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Low-speed sensorless control of pmsm motor drive using a nonlinear approach backstepping control: FPGA-based implementation

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Journal of Theoretical and Applied Information Technology 2012年第2期36卷 154-166页

作者： Bossoufi, Badre Karim, Mohammed Ionita, Silviu Lagrioui, Ahmed STIC Team Faculty of Sciences Dhar El Mahraz University of Sidi Mohammed Ben Abdellah Fez Morocco Center of Modeling and simulation of the systems Faculty of Electronics Communications University of PITEŞTI Romania

This paper presents a novel speed control technique for a permanent magnets synchronous (PMSM) drive based on newly nonlinear backstepping technique. We design a not adaptive speed regulator for a permanent-magnet synchronous motor (PMSM). In this paper, we present a new contribution of FPGAs (Field-Programmable Gate Array) for control of electrical machines. In this paper a robust continuous approach nonlinear not adaptative Control strategy for permanent-magnet synchronous motor (PMSM) drive systems is presented. This control scheme is based on an adaptive pole placement control strategy integrated to a Backstepping control scheme. The overall stability of the system is shown using Lyapunov technique. The simulation results clearly show that the proposed not adaptive scheme can track the speed reference. A bench test was realized by a prototyping platform, the experimental results obtained show the effectiveness and the benefit of our contribution and the different steps of implementation for the control FPGA. © 2005 - 2012 JATIT & LLS. All rights reserved.

关键词： Permanent magnets

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Designed simulation experiments, Part 1: Roots, myths, and limitations of conventional DOE

Designed simulation experiments, Part 1: Roots, myths, and l...

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AIAA modeling and simulation Technologies Conference 2011

作者： Collins, Brett D. Hurst, Terril N. Ard, Jason M. Modeling Simulation and Analysis Center Raytheon Missile Systems Bldg M09 M/S 1 Tucson AZ 85756 United States Modeling Simulation and Analysis Center Raytheon Missile Systems Bldg 805 M/S C1 Tucson AZ 85756 United States

ISBN: (纸本)9781624101540

This paper illustrates specific challenges encountered in attempting to follow standardized principles and methods, established during the earlier eras of design of experiments (DOE), when the task is the design and analysis of simulation experiments (DASE). These problems are accentuated when DASE is used to develop and improve software-centric systems, such as guided missiles, which manifest a new level of dynamic complexity. An analysis of the current issues paves the way for successful DASE, and a companion paper (Part 2) describes how DOE is being modified and expanded to increase likelihood success in this emerging era. © 2011 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Design of experiments

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simulation based analysis for selection and evaluation of green manufacturing strategies

Simulation based analysis for selection and evaluation of gr...

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8th International Conference on Service systems and Service Management, ICSSSM'11

作者： Zhou, Ming Pan, Yanchun Chen, Zhimin Weiyang Li, Binran College of Management Shenzhen University Shenzhen China Center for Systems Modeling and Simulation Indiana State University Terre Haute CA United States

ISBN: (纸本)9781612843094

Evaluation and selection of green sustainable development (GSD) strategies is a critical but difficult process involving many uncertain factors and affected by dynamic conditions. The decision problem is essentially multi-objective. This research proposed a simulation based method that uses simulation to capture the complicated process flow and decision logic involved, and interface the simulation with a search procedure to improve solutions. The design of simulation model emphasized a robust structure that represents adequately the process flow and decision logic of typical applications of GSD improvement. A process/activity based cost structure was built into the simulation to capture essential trade-offs contributed by different cost drivers during the process of GSD implementation. Experiments were designed and implemented via simulation to verify and validate proposed concepts. An analysis of response surface method (RSM) was conducted to illustrate the search for optimal solutions under relaxed conditions, which showed the potential of developed research. © 2011 IEEE.

关键词： Sustainable development

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Static model of shaft furnaces with oxygen injection based on chemical energy maximized utilization

Beijing Keji Daxue Xuebao/Journal of University of Science a...

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Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing 2012年第6期34卷 691-694页

作者： Liu, Bing-Nan Li, Qiang Feng, Ming-Xia Zou, Zong-Shu Yu, Ai-Bing School of Materials and Metallurgy Northeastern University Shenyang 110004 China School of Metallurgy Liaoning Institute of Science and Technology Benxi 117022 China Center for Simulation and Modeling of Particulate Systems School of Materials Science and Engineering University of New South Wales New South Wales 2052 Australia

In consideration of such problems as low gas utilization ratio, large gas consumption and high carbon dioxide emissions, a method was proposed by designing a new shaft furnace with oxygen injection into the upper zone. Based on the mass and energy balances of gas and solid phases, a static model of the shaft furnace was developed to simulate the iron-making process in the shaft furnace. Calculating results show that under the typical operation conditions, the gas volume of the shaft furnace with oxygen injection is 1404.67 m3, and the oxygen volume is 20.32 m3 for per ton of direct reduction iron. In comparison with a traditional shaft furnace, the reduction potential of top gas decreases to 0.56, the carbon emission decreases by 26.25%, and the energy consumption decreases by 19.56%.

关键词： Energy utilization

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Classifying general nonlinear force laws in cell-based models via the continuum limit

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Physical Review E 2012年第2期85卷 021921-021921页

作者： Philip J. Murray Carina M. Edwards Marcus J. Tindall Philip K. Maini Centre for Mathematical Biology Mathematical Institute 24–29 St Giles' Oxford OX1 3LB United Kingdom Center for Modeling and Simulation in the Biosciences Im Neuenheimer Feld 267 University of Heidelberg D-69120 Heidelberg Germany School of Biological Sciences Department of Mathematics and Statistics and Institute for Cardiovascular and Metabolic Research University of Reading Whiteknights Reading Berkshire RG6 6AJ United Kingdom Oxford Centre for Integrative Systems Biology Department of Biochemistry South Parks Road Oxford OX1 3QU United Kingdom

Although discrete cell-based frameworks are now commonly used to simulate a whole range of biological phenomena, it is typically not obvious how the numerous different types of model are related to one another, nor which one is most appropriate in a given context. Here we demonstrate how individual cell movement on the discrete scale modeled using nonlinear force laws can be described by nonlinear diffusion coefficients on the continuum scale. A general relationship between nonlinear force laws and their respective diffusion coefficients is derived in one spatial dimension and, subsequently, a range of particular examples is considered. For each case excellent agreement is observed between numerical solutions of the discrete and corresponding continuum models. Three case studies are considered in which we demonstrate how the derived nonlinear diffusion coefficients can be used to (a) relate different discrete models of cell behavior; (b) derive discrete, intercell force laws from previously posed diffusion coefficients, and (c) describe aggregative behavior in discrete simulations.

关键词： NONLINEAR systems CONTINUUM (Mathematics) SIMULATED annealing (Mathematics) PHENOMENOLOGICAL biology BURGERS' equation NUMERICAL analysis

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Development of core manufacturing simulation data translators for simulation modeling

Development of core manufacturing simulation data translator...

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61st Annual Conference and Expo of the Institute of Industrial Engineers

作者： Fournier, Jonathan Leong, Swee Modeling and Simulation Laboratory Connecticut Center for Advanced Technology East Hartford CT 06108 United States Manufacturing Systems Integration Division National Institute of Standards and Technology Gaithersburg MD 20899 United States

ISBN: (纸本)9780983762409

The Core Manufacturing simulation Data (CMSD) data interface standard from NIST was developed to facilitate the exchange of manufacturing data between disparate manufacturing applications including process planning systems and discrete event simulation software tools. The Connecticut center for Advanced Technology has developed an Application Programming Interface (API) for handling CMSD files input and output. This paper will detail how the API is structured, and how it has been used to create translators for converting process planning data and other relevant manufacturing data into CMSD data structures as well as for translating CMSD data into simulation models.

关键词： Application programming interfaces (API)

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FPGA-based implementation with simulation of structue Direct Torque Control of a PMSM

FPGA-based implementation with simulation of structue Direct...

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2011 International Conference on Multimedia Computing and systems, ICMCS'11

作者： Bossoufi, Badre Karim, Mohammed Lagrioui, Ahmed IoniţǍ, Silviu Laboratory of Data Processing Imagery and Analysis Numerical Faculty of Sciences Dhar El Mahraz Fez Morocco Center of Modeling and Simulation of the Systems Faculty of Electronics Communications and Computers University of Piteşti Piteşti Romania

ISBN: (纸本)9781612847306

The performance of FPGA increases continually, thus in many applications they can be an interesting alternative to DSPs. The aim of this work is to present the contribution of FPGAs for electrical machines control. The features of FPGAs and their environment will be presented first. Then a detailed description of the structure by Direct Torque Control DTC of Permanent Magnet Synchronous Machine is presented, Experimental results obtained on a prototyping platform are given to illustrate the efficiency and the benefits of the proposed approach and the various stages of implementation of this structure in FPGA. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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How is M&S interoperability different from other interoperability domains?

How is M&S interoperability different from other interoperab...

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Spring simulation Interoperability Workshop 2011, 2011 Spring SIW

作者： Tolk, Andreas Diallo, Saikou Y. Padilla, Jose J. Turnitsa, Charles D. Engineering Management and Systems Engineering 242B Kaufman Hall Old Dominion University Norfolk VA 23529 United States Virginia Modeling Analysis and Simulation Center Old Dominion University 1030 University Blvd. Suffolk VA 23435 United States

ISBN: (纸本)9781617824241

During every standard workshop or event, the examples of working interoperability solutions are used to motivate for 'plug and play' standards for M&S as well, like standardized batteries for electronics, or the use of XML to exchange data between heterogeneous systems. While these are successful applications of standards, they are off the mark regarding M&S interoperability. The challenge of M&S is that the product that needs to be made interoperable is not the service or the system alone, but the model behind it as well. The paper shows that the alignment of conceptualizations is the real problem that is not yet dealt with in current interoperability standards.

关键词： Interoperability

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