FUJI ELECTRIC JOURNAL 2003 Vol.76-No.4
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Simulation Technology |
Fuji Electric's Efforts in the Field of Simulation Technology
Yujiro Kitaide
Computer-based simulations are actively used in the manufacturing
industry as a design tool to develop new and unconventional product
concepts and to realize them instantaneously. Computer simulations
are performed during the stages of product development and system
analysis to gain an advance understanding of phenomena. This
paper gives an overview of the trends of simulation technology and Fuji
Electric's efforts in this field.
Simulation Technology for Distributed Power Supplies
Hiroshi Kojima, Yosuke Nakanishi
Simulation technology for electrical power systems, including distributed
power supplies, is important for promoting the adoption of distributed
power supplies while maintaining the stable operation of electrical
power systems. This paper describes the issues involved in linking
distributed power supplies within an electrical power distribution
system, and introduces modeling technology and example analyses of
distributed power supplies used in the simulations.
Parallel 3-D Electromagnetic Computation for a Transformer
Satoshi Matsumoto, Kiyoshi Fujii
Technical computation is an indispensable technique for product
design and development. The application of parallel computing is
extremely effective in meeting the needs for faster and larger-scale
technical computations. Parallel computing-based electromagnetic
analysis software has been developed and applied to the analysis of
transformers. This paper presents examples of this analysis, the
results of which are in good agreement with actual phenomena. Largescale
electromagnetic analysis enables the total behavior of a subject to
be observed, and is therefore useful in the design and development of
transformers.
Computer Simulation of Molded-case Circuit Breaker Interruption
Toshiyuki Onchi, Masaru Isozaki, Masayoshi Wada
This paper describes the simulation of interrupted 3-phase shortcircuit
current for analysis of the interrupted performance of a moldedcase
circuit breaker (MCCB). This simulation technique makes it possible
to analyze 3-phase interrupting phenomena by performing
sequential analyses of an electrical circuit model based on the arc voltage
and equations of motion due to the electromagnetic repulsive force
acting upon the MCCB's moveable contact. Use of this simulation technique
to perform analyses enables the advance estimation and evaluation
of interrupting performance under arbitrary circuit conditions.
Mixed Device and Circuit Simulation Technology
Yasushi Abe, Koji Maruyama
In the field of power electronics, advances in semiconductor device
technology have driven the trends toward miniaturization, lower price
and higher performance of power converters. Fuji Electric is studying
simulator-based circuit design techniques in order to realize such
power converters with even superior performance, and within a short
turn around time from conception to development. Application of ISE
Integrated Systems Engineering's ISE-TCAD simulator, which allows
for mixed device and circuit simulation, was studied. This paper presents
the results of using that simulator to analyze several actual
examples of circuits containing high-voltage IGBTs.
Fluid Flow Simulation Technology for Vending Machine
Hirohisa Arai
As part of Fuji Electric's measures to help curb global warming,
we decreased the power consumption of our automated vending
machines by approximately 59% by year 2001, and are making efforts
to conserve energy even further. Automated vending machines use
fans to circulate air to heat or cool beverages, and the behavior of this
air flow influences the power consumption. However, the internal construction
of an automated vending machine is complex and previous
attempts to experimentally determine the flow were only able to provide
a rough understanding. This paper describes a thermal flow simulator
that has been developed for use in automated vending machines
and which enables flow behavior to be understood by building a database
of fan characteristics observed by a stereo PIV system.
Dynamic Analysis of Can Behavior in Vending Machine's Rack
Takanori Yamada, Kazuya Nakayama
In order to optimize the design of automated vending machines,
technology has been developed to simulate the behavior of cans falling
in a storage compartment (rack). Kinematic analysis simulation technology
is employed to analyzeŠ±uantitatively and within a short
amount of timeŠ“he rolling and rebounding behavior and orientation of
can which are hollow bodies that encapsulate a liquid. We modeled the
products and passageway components inside the machine as rigid bodies
and analyzed their 3-dimensional behavior. The good agreement
between the analysis results and actual behavior confirmed the suitability
of this analysis method. This method enables the falling behavior
of can to be estimated quantitatively based on the design drawings,
and thereby enhances development efficiency.
Simulation Technology for Optimum Structural Design
Masayoshi Sakata, Kota Matsumoto
While responding to requests for shorter development times,
higher product quality, enhanced performance and cost reduction, optimum
structures must be designed within certain constraints and limited
time. Under these circumstances, optimal design technology that
uses a computer to determine the optimal structure is being promoted
to ease the burden on the designers. This paper presents several
examples of optimum structural design, the optimum design of cooling
fins used in power electronics and the optimization of conditions for the
injection molding of plastic.
Numerical Simulation Technology for Lubricant Flow on HDD Media
Mineo Oka
The lubricant on HDD media has an important role in determining
abrasion resistance and impact resistance, and its flow characteristics
affect the spin-off characteristics and recovery process. When selecting
lubricants, it is important that they be cataloged according to flow characteristics
using the simplest possible parameters. Previous research
used diffusion coefficients that assumed the initial lubricant thickness
to be a step function. That assumption, however, led to the problem of
overestimation of the diffusion coefficient because the initial distribution
is not actually a step function. This paper describes a new method
for accurately computing the diffusion coefficient by combining experimentally
measured data and numerical computation, and presents an
example application. Calculated values agree well with experimentally
measured results.
Material Design Simulation by First-principles Calculations
Yoshinori Konishi, Michio Ohsawa, Yoshiyuki Yonezawa
Perovskite-type transition metal oxides have such versatile properties
that there is a great chance of finding new materials which are
useful for thin film device applications. Fuji Electric is developing new
materials in order to differentiate our products from those of our competitors.
We search for new materials by performing material design
simulations using first-principles calculations. Combinatorial methods,
which enable high-throughput synthesis and screening, have been used
to study the conditions for synthesizing new materials. This paper
describes an example of our efforts in developing new ferroelectric
materials.
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