| ====================================================================== ENGINEERING NEWS IN BRIEF E-Mail Newsletter No.80 Issued by the Asian TOP Panel, August 2008 The Chinese Mechanical Engineering Society (CMES) The Institution of Engineers, Indonesia (PII) The Japan Society of Mechanical Engineers (JSME) The Korean Society of Mechanical Engineers (KSME) ====================================================================== According to the agreement made in the 2nd Asian TOP Panel Meeting, the ENGINEERING NEWS IN BRIEF (E-mail newsletter) has now been edited by the JSME for the year 2008. ====================================================================== [Contents] 1) Development of High-Current Plasma Assisted Deposition system (Source: JSME) 2) Development of the Distance Control Assist system (DCA) (Source: JSME) 3) Trend of Driver’s Operation Assistant Systems (Source: JSME) 4) A tool for supporting decision making processes and its possibility in mechanical design and development (Source: JSME) 5) Utilization of Biogas (Source: JSME) 6) Development of Simulation and Real Time Control Platform for Fuel Cell Powertrain (Source: CMES) 7) Research on Viscoe - elasticity Plasticity Unified Constitutive Relationship of Vibration Rotary Forging and Its Hysteresis Procedure Simulation (Source: CMES) 8) CMES Headquarters has Moved to New Office (Source: CMES) 9) Development of Membrane Filters with Nanostructured Porous Layer by Coating of Metal Nanoparticles Sintered onto a Micro-Filter (Source: KSME) 10) Optimal Design of an MRI Device Considering the Homogeneity of the Magnetic Field (Source: KSME) 11) Combustion and Exhaust Emission Characteristics of Bio-Ethanol Fuel(E100) in SI Engine (Source: KSME) ======================================================================== 1) Development of High-Current Plasma Assisted Deposition system Ryuichi IIDA, Tsukishima Kikai Co., Ltd Digital electric appliance market is actively
headed toward the start of digital
broadcasting
in recent years, represented by thin
and
large screen TV, DVD recorders, digital
cameras
and other devices. For all of these devices, optics technology
becomes the key and various optical
elements
such as lenses are used. Optical thin-film multi-layers that appropriately
fit application on infrared-cut filters
are
formed on the surface of those optical
elements. keyword：optical thin-film, vacuum evaporation, ionplating,
plasma assisted deposition, pressure
gradient
type plasma source Yosuke AKATSU, Nissan Motor Co.,Ltd The Distance Control Assist system (DCA)
helps drivers control the distance
between
themselves and the vehicle in front.
The
system uses a radar sensor installed
in the
front bumper which is able to determine
the
following distance of the drivers as
well
as the relative vehicle speed of both
cars.
If the driver releases the brakes in
order
to help the driver maintain an appropriate
following distance. If the system determines
that braking is required, an indicator
will
appear on an instrument panel and buzzer
will sound. And the system will move
the
gas pedal upwards in order to assist
the
driver to switch to the brake pedal. Hiroshi TAKAHASHI, Shonan Institute of Technology Driver assistant systems are both warning
assistant systems (WAS) and operation assistant
systems (OAS). In this paper, the OAS are
focused. The OAS are the systems that interleave partially
automated operation with driver’s manual
driving operation. For instance, the typical
applications of the OAS are the collision
mitigation systems, lane keep support systems
and adaptive cruise control.
Yutaka NOMAGUCHI, Osaka University A decision making by an individual and a
group of engineers takes place in various
scenes of design and technological
development.
From the viewpoint of knowledge management,
it is important to record a process
of decision
making and various referred information
so
that designers and engineers can share
and
reuse them in order to efficiently
and effectively
carry out a future design. This article
briefly
explains a research trend of supporting
decision
making processes, and a representative
support
tool, called Compendium. Compendium
is an
IBIS-based hypertext mapping tool that
was
released for free download, and subsequently
it was made open source. The tool is
steadily
growing in polish and sophistication
in a
research and user community. Case studies
show its possibility in supporting
decision
making processes of a complicated mechanical
system's design and development. Tateo NAKAZAWA, Nippon Sharyo, Ltd. Through the experiment since 2004 in the
operation of biogas plant processing
waste
of 200 dairy cows, which was installed
next
door to cowshed of a dairy farming
company,
we, Nippon Sharyo verified that hydrogen
sulfide emitted in the process of methane
fermentation is removed by some bacteria
and electric power is continuously
and stably
generated by compressed biogas.
Jin Zhenhua, Ouyang Minggao, Lu Qingchun,
Gao Dawei Based on virtual instrument development workbench, simulation and real time control system for fuel cell powertrain was developed and a model based controller development platform was constructed. Sub-systems of the powertrain were modeled and simulation software was developed with Lab VIEW Simulation module. Real time control system was constructed with embedded PC and Lab VIEW real time module. Application of the platform shows the system works well. Key words: fuel cell powertrain; virtual
instrument; simulation software; real
time
control system Cai Gaipin, Jiang Zhihong, Luo Xiaoyan As visco-elasticity-plasticity material constitutive relationship was analyzed, a hypothesis yield face which was not effected by temperature was popularly used to suppose viscoe-elasticity-plasticity material deformation trend, and the inherent law of metal material in heat deformation was difficultly opened out by this method. Thus, the viscoe-elasticity-plasticity material constitutive relationship needed to be built by the continuum mechanics theory and thermodynamics under the conditions of temperature field effect consideration and the hypothesis yield face overcame. After motion hardening variable and the identification hardening variable introduced, the inner variables and stress evolvement course were analyzed in heat steady state creep forming the viscoe-elasticity-plasticity material constitutive equations were established. And by means of Oula difference method, the unified constitutive equations numerical solutions were also obtained. According to a cycle of strain ratio loading and by MATLAB computer simulation, the varied law of inner variables, stress and strain were found, and the validity of the viscoe-elasticity-plasticity unified constitutive models were validated. Key words: rotary forging; vibration; viscoe-elasticity-plasticity;
inner variable; constitutive relationship;
hysteresis loop simulation
Dong Geun Lee1, Seok Joo Park2, Young Ok Park2, Jeong In Ryu1 The membrane filter adhered with nanostructured porous layer was made by heat treatment after deposition of nanoparticle-agglomerates sintered in aerosol phase onto a conventional micron-fibrous metal filter as a substrate filter. The Sintered-Nanoparticle-Agglomerates-coated NanoStructured porous layer Membrane Filter (SNA-NSMF), of which the filtration performance was improved compared with the conventional metal membrane filters, was developed by adhesion of nanoparticle-agglomerates of dendrite structure sintered onto the micron-fibrous metal filter. The size of nanoparticle-agglomerates of dendrite structure decreased with increasing the sintering temperature because nanoparticle-agglomerates shrank. When shrinking nanoparticle-agglomerates were deposited and treated with heat onto the conventional micron-fibrous metal filter, pore size of nanostructured porous layer decreased. Therefore, pressure drops of SNA-NSMFs increased from 0.3 to 0.516 kPa and filtration efficiencies remarkably increased from 95.612 to 99.9993%. Key words: Laser Ablation, Infrared Furnace, Pressure Drop, Penetration, Filter Quality
Junghoon Lee, Jeonghoon Yoo , Yonsei University This paper is to suggest a concept design of the permanent magnet type magnetic resonance imaging (MRI) device based on the parameter optimization method. Pulse currents in the gradient coils will introduce the effect of eddy currents in the ferromagnetic material, which will worsen the quality of imaging. In order to equalize the magnetic flux in the MRI device for good imaging, the eddy current effect in the ferromagnetic material must be taken into account. This study attempts to use the design of experiment (DOE) and the response surface method (RSM) for equalizing the magnetic flux of the permanent magnet type MRI device using that the magnetic flux can be calculated directly using a commercial finite element analysis package. As a result, optimal shapes of the pole and the yoke of the PM type MRI device can be obtained. The commercial package, ANSYS, is used for analyzing the magnetic field problem and obtaining the resultant magnetic flux. Key words: Magnetic Resonance Imaging, Magnetic
Field, Design of Experiment, Response
Surface
Method, Finite Element Analysis Key Words: SI Engine, Bio-Ethanol, Combustion Characteristics,
Exhaust Emission Characteristics |
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