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Dynamic modeling of a magnetic system constructed with giant magnetostrictive thin film using element-free Galerkin method

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IEEE TRANSACTIONS ON MAGNETICS 2006年第4期42卷 939-942页

作者： Yang, QX Chen, HY Liu, SZ Yang, WR Fan, CZ Yan, WL Liu, S Hebei Univ Technol Province Minist Joint Key Lab Electromagnet Field Tianjin 300130 Peoples R China Florida Int Univ Miami FL 33174 USA

A dynamic model of electromagnetic devices constructed with magnetostrictive thin film is developed to study the dynamic characteristics of the system. In the developed model, the inductance is considered as current and geometry dependent so as to represent the magneto-elastic property of the magnetostrictive thin film. Such an inductance is obtained from coupled magnetoelastic field solutions. Element-free Galerkin method (EFGM) is adopted in numerical field analysis so as to describe the magnetostrictive thin film;the Delta E effect is considered to improve the material property modeling. the developed simulation model is examined through comparing the simulated current-voltage characteristic with the measured one.

关键词： dynamic model element-free Galerkin method (EFGM) magnetostrictive thin film magneto-elastic coupling

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High frequency PM synchronous motor model determined by FE analysis

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IEEE TRANSACTIONS ON MAGNETICS 2006年第4期42卷 1291-1294页

作者： Mohammed, OA Ganu, S Abed, N Liu, S Liu, Z Florida Int Univ Energy Syst Lab Dept Elect & Comp Engn Miami FL 33174 USA

A high frequency phase variable model for PM synchronous motor is proposed. It is composed of a low frequency phase variable model with a high frequency winding branch connected in parallel. the winding branch considers the high frequency effects on the machine winding parameters namely resistance, inductance and capacitance. the resistance and inductance of each individual winding turn were calculated by time harmonic FE analysis. the self capacitance of each turn and the mutual capacitances between turns were evaluated by electrostatic FE analysis. Using these circuit parameters, a distributed-parameter winding circuit is formed. the Kron reduction technique is applied to the distributed-parameter winding circuit to obtain a lumped high frequency branch. the implementation is performed on a 2-hp PM synchronous motor and the simulation results show the validity of the proposed model. the originality of this work is that it provides a numerical tool for examining the machine design instead of experiments.

关键词： dynamic simulation FE high frequency modeling Kron reduction technique PM synchronous motor

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3D sign language mathematics in immersive environment

3D sign language mathematics in immersive environment

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15th IASTED International conference on Applied simulation and Modelling

作者： Adamo-Villani, Nicoletta Carpenter, Edward Arns, Laura Purdue Univ Dept Comp Graphics Technol 401 N Grant St W Lafayette IN 47907 USA Purdue Univ Envis Ctr for Data Perceptualizat W Lafayette IN 47907 USA

ISBN: (纸本)0889865590

In this paper we describe the development of a new immersive 3D learning environment to increase mathematical skills of deaf children. the application teaches mathematical concepts and ASL (American Sign Language) math terminology through user interaction with fantasy 3D virtual signers and environments. the program can be displayed in immersive devices and includes a gesture control system comprised of a pair of pinch gloves and a 6-degrees-of-freedom wrist tracker. Our application improves on existing examples of virtual learning environments for the hearing impaired in terms of: (1) high realism/fluidity of the 3D characters' signing motion;(2) complexity of real time interaction between student and 3D avatars and environments;and (3) natural communication between user and application via a simple glove-based gesture control system.

关键词： virtual reality sign language education 3D animation 3D modeling virtual learning environments

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Finite-element-based nonlinear physical model of iron-core transformers for dynamic simulations

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IEEE TRANSACTIONS ON MAGNETICS 2006年第4期42卷 1027-1030页

作者： Mohammed, OA Liu, Z Liu, S Abed, NY Florida Int Univ Energy Syst Lab Dept Elect & Comp Engn Miami FL 33174 USA

A finite-element (FE)-based transformer physical phase variable model is proposed. In this model, the effects of nonlinear magnetization on inductances are included by considering the inductance variations with the amplitude of the ac flux as well as its phase angle during a complete ac cycle. Such a consideration is represented by 2-D inductance tables. the magnetizing currents at various magnetization levels are used to calculate the inductances then build the table. the magnetizing currents are determined using circuit-coupled FE analysis of the transformer with sinusoidal voltage supplies. the structure of the inductance table is given and the procedure of inductance table lookup during dynamic simulation is provided. Simulink implementation of the FE-based transformer phase variable model is performed. the validity of the presented technique is verified through comparing the magnetizing current waveforms obtained from the FE-based phase variable model and those from an FE model. the significance of the proposed FE-based phase variable model is in its accuracy and its applicability for dynamic simulation of interconnected components in a power system.

关键词： dynamic simulation finite elements FE-based model phase variable physical modeling transformer

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On timed simulation relations for hybrid systems and compositionality

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4th International conference on Formal modeling and Analysis and Timed Systems

作者： Frehse, Goran VERIMAG France

ISBN: (纸本)3540450262

Timed and weak timed simulation relations are often used to show that operations on hybrid systems result in equivalent behavior or in conservative overapproximations. Given that systems are frequently designed and verified in a modular approach, it is desirable that this relationship is compositional, which is not the case for hybrid systems in general. We identify subclasses of linear hybrid automata that are compositional with respect to timed, respectively weak timed simulation.

关键词： Hybrid computers

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Advances of object oriented environments: Modelling, simulation and control of linear pendulum in stone wool production system in modelica

Advances of object oriented environments: Modelling, simulat...

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15th IASTED International conference on Applied simulation and Modelling

作者： Zupančič, Borut Šink, Janko University of Ljubljana Faculty of Electrical Engineering Tržaška 25 Slovenia TERMO d.d. Trata 32 4220 Škofja Loka Slovenia

ISBN: (纸本)0889865612

Many modeling and simulation tools have a lack of object orientation. So it is not possible to build true reusable components. Modelica is on the other hand a nice example of OO modeling language which can become an international standard for model exchange. In our investigation the OO approach using DMOLA-Modelica was efficiently used for studying a pendulum system in a stone wool production technology in a Slovenian company. In this system linear (horizontal) movement of a bottom edge of the pendulum system is a very important technological feature in forming the secondary wool layer. the results showed different disadvantages of the current realization, when the whole system is driven by two motors, with pendulum drive and eccentric drive. Namely it is not possible to achieve horizontal movement and constant velocity of the lower edge of the pendulum. So a new solution with two linear instead of rotational drives was proposed. the simulation results showed that it is possible to achieve more appropriate movements with regard to position and velocity of the lower edge of the pendulum. therefore we expect serious considerations about the reconstruction of the linear pendulum system.

关键词： Object oriented programming

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New cellular automata model of pedestrian representation

New cellular automata model of pedestrian representation

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7th International conference on Cellular Automata for Research and Industry

作者： Was, Jaroslaw Gudowski, Bartlomiej Matuszyk, Pawel J. AGH Univ Sci & Technol Inst Automat PL-30059 Krakow Poland AGH Univ Sci & Technol Dept Modelling & Informat Technol PL-30059 Krakow Poland

ISBN: (纸本)3540409297

the microscopic scale of pedestrian dynamics modeling requires creating various kinds of models. Two features of a model seem to be most important: simulation realism and computational effectiveness. the paper describes nonhomogeneous CA model of pedestrian dynamics for a certain limited area. the pedestrians are represented by ellipses on a square lattice, which implies the necessity of taking into account some geometrical constraints for each cell. Edward Hall's idea of social distances is introduced into the model - pedestrian behavior in the model is influenced by the rules of proxemics. As an example, the authors present a simulation of pedestrian behavior in a tram.

关键词： Automata theory

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Role organization model in Hozo

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15th International conference on Managing Knowledge in a World of Networks

作者： Sunagawa, Eiichi Kozaki, Kouji Kitamura, Yoshinobu Mizoguchi, Riichiro Osaka Univ Inst Sci & Ind Res Ibaraki Osaka 5670047 Japan

ISBN: (纸本)3540463631

the establishment of a computational framework of roles contributes effectively to the management of instance models because it provides us with a useful policy for treatment of views and contexts related to roles. In our research, we have developed an ontology building environment, which provides a framework for representation of roles and their characteristics. In this paper, as an extension of the framework, we present a framework for organizing roles according to their context dependencies. We especially focus on defining and organizing compound roles, which depend on several contexts.

关键词： role modeling context dependency ontology development

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Recent advances in single-chamber fuel-cells: Experiment and modeling

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SOLID STATE IONICS 2006年第19-25期177卷 2013-2021页

作者： Hao, Yong Shao, Zongping Mederos, Jennifer Lai, Wei Goodwin, David G. Haile, Sossina M. CALTECH Pasadena CA 91125 USA CALTECH Pasadena CA 91125 USA

Single-chamber fuel cells (SCFC) are ones in which the fuel and oxidizer are premixed, and selective electrode catalysts are used to generate the oxygen partial pressure gradient that in a conventional dual-chamber design is produced by physical separation of the fuel and oxidizer streams. SCFCs have been shown capable of generating power densities above 700 mW/cm(2) with appropriate catalysts, making them potentially useful in many applications where the simplicity of a single gas chamber and absence of seals offsets the expected lower efficiency of SCFCs compared to dual-chamber SOFCs. SCFC performance is found to depend sensitively on cell microstructure, geometry, and flow conditions, making experimental optimization tedious. In this paper, we describe recent work focused on developing a quantitative understanding the physical processes responsible for SCFC performance, and the development of an experimentally-validated, physically-based numerical model to allow more rational design and optimization of SCFCs. the use of the model to explore the effects of fuel/oxidizer ratio, anode thickness, and flow configuration is discussed. (c) 2006 Elsevier B.V. All rights reserved.

关键词： solid oxide fuel cell single chamber hydrocarbon fuels experiment and simulation

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Coarse-grained molecular dynamics studies of cluster-bombarded benzene crystals

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APPLIED SURFACE SCIENCE 2006年第19期252卷 6436-6439页

作者： Smiley, Edward J. Postawa, Zbigniew Wojciechowski, Igor A. Winograd, Nicholas Garrison, Barbara J. Penn State Univ Dept Chem University Pk PA 16802 USA Jagiellonian Univ Smoluchowski Inst Phys Krakow Poland

As high-energy cluster projectile beams become standard analysis probes for SIMS, simulating larger crystals is now a requirement for the modeling community due to the large sputtering yields. As crystals get larger, computer resources become a limitation. Even though computer technology has evolved to include large memory systems and fast processors, there are still issues with having sufficient resources to run a calculation. this manuscript reports a method of studying a full crystal of benzene after impact with a 500 eV C-60 projectile using a coarse-grained model. the potentials developed for this model incorporate the C-H bond of benzene into a single coarse-grained bead. this coarse-grained method has several advantages over atomistic models-the amount of time to perform these calculations has been drastically reduced and the potentials for this sample are pair-wise additive potentials. A discussion is made as to how these results compare to those obtained with fully atomistic calculations using the AIREBO potential. (c) 2006 Elsevier B.V. All rights reserved.

关键词： molecular dynamics simulation cluster C-60 SIMS

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