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FUJI ELECTRIC JOURNAL 2001 Vol.74-No.6
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Simulation Technology |
Trend of Simulation Technology and Fuji Electric's Research and Development
Kenichi Kurotani
Simulation technology is widely used in various fields. The problems of technical computing are easier analysis, popularization and larger scale. Technologies such as free mesh and parallel computing have been developed to solve these problems. Fuji Electric has utilized simulation technology in various fields, giving satisfactory results. In the future, our effort will be directed to improvement in simulation technology, focusing on the noticeable fields, environment, information, services and components.
Technical Computing Server and its Examples of Analyses
Kouta Matsumoto, Syuji Asakawa
Fuji Electric has innovated the server used in common for technical computing. The new technical computing server is a UNIX computer capable of parallel computing, which has made possible remote log-in from an engineering work station (EWS) and a personal computer (PC) and use from the Web. Parallel computing can raise the speed 5 to 20 times higher than before and can enlarge the analysis scale. The technical computing server is used for analysis such as flow analysis, structural analysis, electromagnetic field analysis and device simulation. Parallel computing with a PC cluster has become capable of comparatively large-scale analysis. Each use can select a suitable method of computing.
Sewage Treatment Simulation
Yuji Furuya, Kunihiko Hashida, Noboru Okuda
Fuji Electric is developing an operation support system for a sewage treatment plant using the activated sludge model of the plant. The introduction of simulation is planned for the purpose of investigating operation control conditions, activated sludge reactor capacity and equipment control conditions, reducing operation and management costs, and ensuring the stable quality of treated water. This paper describes the operation support system for advanced sewage treatment installed in the supervisory control computer system and the advanced sewage treatment simulator capable of the above-mentioned investigations for two or more activated sludge processes.
Simulation of the Neuro-Control of Incineration Plants
Teruaki Tsukamoto, Haruyuki Matsumoto, Kazuo Nomura
In the combustion control of incineration plants, control parameter settings need to be adjusted according to variation in garbage charac-teristics and the temporal changes of the equipment. Fuji Electric developed an automatic combustion control system based on neural networks. It was proved that this system made control parameter adjustment for varying garbage characteristics easier with the control quality kept on the same level or higher. This paper describes the procedure of the neuro-control automatic combustion system and the simulation system used for modeling the controlled process.
Analog Simulation Technology for Power Systems
Shinsuke Nii
In recently complicated power systems, power system analysis have more often dealt with complicated phenomena such as power system resonance and multiplex faults. On the other hand, it is supposed that many distributed power sources will be connected with the extremely high-voltage line and distribution line following the deregulation of power systems, and it is becoming necessary to review the conventional methods of power flow control and protective control against system faults. Under these circumstances, a simulator for a predicted future power systems is required. This paper describes the latest analog simulator model based on the recent power situation.
Simulation of Vehicle Routing for Vending Machine Replenishment
Kenya Murakami, Junichi Hiramatsu, Kazuya Nagase
MetroVMI is a newly developed original algorithm to support dispatch planning for replenishing vending machines at vending operators. It is based on the idea of the vendor managed inventory (VMI). This paper outlines the MetroVMI and its simulation applied to real data. The simulation results proved that the MetroVMI made vending operation much efficient. Quite useful information and hints on the actual application of the algorithm were obtained through this simulation, and its application to many systems is expected.
Three-Dimensional Computer-Graphic Simulation
Kiyoshi Takahashi, Masato Miyoshi
Fuji Electric developed the basic technology of three-dimensional computer graphics (CG) application, and recently, has developed the application technology of three-dimensional CG simulation using CG scenes. People can not only see a completed system graphically but also point out considerations at the early stage, having an effect on reduction in returns. This paper describes application examples of three-dimensional CG simulation to represent visuality, reality, and sensibility, as well as tools to efficiently draw up three-dimensional CG, including an automated setting tool for lighting.
Fast Security Assessment in Power Systems Using Parallel Distributed Processing
Shinji Kitagawa, Yoshikazu Fukuyama, Yosuke Nakanishi
Because of an increase in the equipment utilization rate and a future deregulated environment in power systems, on-line and off-line security assessment in planning and operation becomes important. Fuji Electric developed a security assessment system for overload and voltage stability using parallel distributed processing. The system was verified by simulation with IEEE standard power systems with promising results. Using a three-PC (personal computer) cluster, the system realized about 2.68 times faster security assessment than the conventional one-PC environment.
Simulation in Electronic Equipment Design Environment
Masabumi Ohno, Osamu Takei, Masatoshi Sugimoto
With the general use of latest semiconductor technology, electronic equipment has rapidly advanced toward smaller size, multipl functions, and higher speed. In designing and developing the equipment, advance verification using board-level simulation has become indispensable. This paper outlines the electronic-circuit design environment and describes the following three points to which our recent efforts have been directed : (1) board-level logic simulation (2) simulation of digital/analog mixed circuits (3) simulation of transmission lines on printed circuit board.
Thermal Design of Power Modules
Yoshinari Ikeda, Katsuhiko Yoshihara
Power devices are required to be compact in size, highly reliable, and easy to use. In reducing the packaging size of power modules, how to efficiently spread power generated in semiconductor devices and how to suppress joule heat evolved from electric wiring are important design factors. This paper describes the packages of the high current IGBT module EconoPACK-Plus and design examples using the thermal simulation of electric wiring. The thermal characteristics of actual EconoPACK-Plus agreed with the simulation and proved that this simulation technology was useful.
Numerical Simulation Technology for Hard Disk Drive Media
Mineo Oka, Mitsuo Kobayashi
To keep up with the media used in the hard disk drive (HDD) advancing toward high recording density and low price, it is required to shorten time required by design and development and to develop high storage capacity media within a short period. This paper describes computer-aided numerical simulation which is one of key technologies to meet these requirements. The following are cited as examples : the tribological simulation of a head-disk interface (HDI) indispensable to reduce head flying height and the micromagnetics simulation necessary to develop the magnetic recording layer of high density media.
New Mixing Blade for Draft Beer Dispensers
Naohiro Kounosu, Kimihisa Kaneko, Tadashi Tsukamoto
Fuji Electric developed a draft beer dispenser having twice the provisions. The increase was attained by a newly developed blade without increase in torque. The development clarified the following : (1) The provisions can be greatly increased by increasing flow velocity in the cooling water tank. (2) Flow velocity distribution in the cooling water tank and torque are precisely estimated by using computational fluid dynamics (CFD) and visualization technique together. (3) The manufacture using laser stereolithography of trial mixing blades for checking functions is effective in shortening the development period.
