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ENGINEERING NEWS IN BRIEF
E-Mail Newsletter
No.85
Issued by the Asian TOP Panel, January 2009
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)
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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 2009.
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[Contents]
1) Development of Ultrasonic Hydrogen Gas Flowmeter
for Domestic Use
(Source: JSME)
2) Development of Non-fluorinated Refrigeration
System using Magnetocaloric Effect (Source: JSME)
3) Product Development Support System Based
on Integrated Modeling of Design and Production (Source: JSME)
4) Research of Stratospheric Platform Airship
(Source: JSME)
5) Development of Fuser for High Speed Color
MFP (Source: JSME)
6) Optimization of Coronary Stent Structure
Design forMaximizing
the Anti-compression
Mechanical Property (Source: CMES)
7) Robust Design of a Two Degree Freedom System
due to the Parameter
Uncertainty (Source: CMES)
8) Research on the Measurement Equipment for
Inject Based on Computer Vision (Source: CMES)
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1) Development of Ultrasonic Hydrogen Gas
Flowmeter for Domestic Use
Kazuki Watanabe, Aichi Tokei Denki Co., Ltd
For efficient operation of a fixed type domestic
fuel cell, supply of hydrogen gas directly
to each customer through piping system
is
effective. Whereas measurement of hydrogen
gas consumed by each customer is necessary
in such application of the fixed type
domestic
fuel cell, Aichi Tokei developed the
prototype
of the ultrasonic flowmeter purposed
to this
usage in cooperation with Kyushu University.
This flowmeter is able to measure hydrogen
gas of low pressure and small flow-rate,
with having its features of high accuracy,
high durability, and low-cost.
Although measuring flow of hydrogen gas with
ultrasonic has difficulties that sound
velocity
of hydrogen gas is fast, the gas weakens
sonic wave easily, etc., the acoustic
and
fluidic simulations of Kyushu University
and the flow-pass newly developed by
Aichi
Tokeicould solve them.
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2) Development of Non-fluorinated Refrigeration
System using Magnetocaloric Effect
Tsuyoshi Kawanami, Kobe University
A magnetic refrigerator that uses the magnetocaloric
effect (MCE) has been commonly employed
to
maintain an extremely low temperature
field. Further, it is an environment-friendly system
that does not use chlorofluorocarbons
(CFCs)
as a refrigerant; hence, various researches
and developments have been carried
out in
recent years to develop magnetic refrigerators
that can be operated near room temperature
for air-conditioning purposes. When the operation temperature of a magnetic
refrigerator is shifted near room temperature,
the heat capacity of a magnetic working
substance
(magnetocaloric material; MCM) becomes
large,
and the temperature change occurring
due
to magnetic field change becomes small. Therefore, an active magnetic regenerator
(AMR) based on a combination of a thermal
storage process and a regeneration
process
is a highly effective method for increasing
the temperature difference between
a hot
end and a cold end. For achieving such an increase in the small
temperature difference during one cycle,
the AMR uses an ingenious mechanism
that
is predominantly based on a combination
of
the MCE due to the magnetic field change
and the regeneration of the material
itself. In this paper, the operating principle and
recent developmental trend of the room-temperature
magnetic refrigerator are reported.
========================================================================
3) Product Development Support System Based
on Integrated Modeling of Design and Production
Tsuyoshi
Koga, The University of Tokyo
Today, product system and organization is
becoming more and more complex and
multi-disciplinary.
A concept of system thinking, system
of systems,
and systems design is becoming more
important,
because the characteristics of design
target
are changed from simple object to complex
system. A model-based systems engineering
approach has been applied for description
and sharing of product function as
system
from strategic early design stage.
SysML
(System Modeling Language) is proposed
for
modeling of product function, structure
and
behavior. SysML can represent a complex
product
system such as automobile and airplane.
Based
on SysML, the product function, structure,
and behavior is visualized and shared
in
order to describe, design, and define
the
system function of a product. In research
area, integrated design and production
modeling
is discussed for supporting the development
process of complex product. A seamless
modeling
language to represent the product function,
structure, behavior, and production
process
is proposed for easy communication
between
design engineer and production engineer.
Based on integrated modeling of design
and
production process, the engineers can
define
the product data reasonably and know
an impact
of design change.
============================================================
4) Research of Stratospheric Platform Airship
Toyotoshi Kurose, Kawasaki Heavy Industries,
LTD
Stratospheric platform airships (SPF-Airship)
will be used as an epoch-making infrastructure
in the stratosphere 20km height.
SPF-Airship is expected to have many excellent
performances in some missions, such
as high-speed
data/communications relay and surveillance
missions with wide area coverage in
civilian,
governmental and self-defense usage.
There are four principal technical items
for SPF-Airship development;
(1) membrane material of lightweight and
high strength
(2) structure that is adapted to ascent to
and descent from the stratosphere
(3) power system that uses solar cells and
regenerative fuel cells
(4) flight control and handling for the SPF-Airship
that is unmanned and has not
good
flight performance
In Japan, some researches and developments
for the SPF-Airship were started in
1998
as a collaborative project with the
Ministry
of Internal Affairs and Communications
and
the Ministry of Education, Culture,
Sports,
Science, and Technology.
As a result, Prospects of solutions
for all technical items were obtained,
and
we can now shift to a Technical Demonstrator
phase.
============================================================
5) Development of Fuser for High Speed Color
MFP
Kazuhiko Kikuchi, Toshiba TEC Corporation
For high speed color MFP, we developed
STF-Fuser which is consistent with energy
saving and image quality at the same time,
by placing the optimized thermal capacitance
Satellite Roller in the low thermal capacitance
Fuser Belt.
============================================================
6) Optimization of Coronary Stent Structure
Design for Maximizing the Anti-compression
Mechanical Property
Shen Xiang, Yi Hong, Ni Zhonghua, Gu Xingzhong
Southeast University
Excellent mechanical property of the anti-compression
or high collapse pressure has become
an essential
feature of new coronary stents. How
to determine
the design parameters of stent becomes
the
key to improve the stent quality. An
integrated
approach using radial basis function
neural
network (RBFN) and genetic algorithm
(GA)
for the optimization of anti-compression
mechanical property of stent is presented
in this paper. First, finite element
simulation
and RBFNN are used to map the complex
non-linear
relationship between the collapse pressure
and stent design parameters. Then GA
is employed
with the fitness function based on
an RBFNN
model for arriving at optimum configuration
of the stent by maximizing the collapse
pressure.
The results of numerical experiment
demonstrate
that the combination of RBFNN and GA
is an
effective approach for the mechanical
properties
optimization of stent.
Key words： Stent Anti-compression, Genetic algorithm
(GA), Radial basis function neural network,
Optimization
============================================================
7) Robust Design of a Two Degree Freedom System
due to the Parameter Uncertainty
Zang Chaoping, Nanjing University of Aeronautics
and Astronautics
A method based on the robust design optimization
is presented to handle the structural
uncertainty
problems. The variations caused in
dynamic
performance can be expressed by the
mean
response and the standard deviation
of the
performance. The robust optimization
approach,
based on a multi-objective and non-deterministic
method, attempts to both optimize the
mean
performance and minimize the variance
of
the performance simultaneously. The
best
possible design optimization is chosen
by
a trade-off decision. An example of
robust
design of a two degree freedom system
is
used to effectively illustrate the
application
in dynamics. The mass and stiffness
uncertainty
in the main system as well as the uncertainty
of the mass, stiffness and damping
in the
absorber are considered all together
in order
to minimize the displacement response
of
the main system within a wide band
of excitation
frequencies. The robust optimization
results
show a significant improvement in performance
compared with the conventional solution
recommended
from vibration textbooks. It is indicated
that robust design methods have great
potential
for application in structural dynamics
to
deal with uncertainty problems.
Key words: Robust design Optimization Dynamics
============================================================
8) Research on the Measurement Equipment for
Inject Based on Computer Vision
Yan Yu, Qu Xinghua, Liu Chengyu, Ye Shenghua
TianjinUniversity
Based on image processing technology, an
automatic inspection equipment based
on industrial
CCD is designed and built. Besides,
an ingenious
device by using FX1N-24MT PLC with
the function
of self-feeding, automatic location
and separate
is designed, which realizes the automatic
inspection. An LED back lighting source
with
uniform scattering is designed, and
a circular
edge extraction algorithm based on
the direction
chain code is put forward. A focusing
evaluation
method based on the characteristic
edge tracking
is proposed, with the result that the
evaluation
function can be correctly focusing
and positioning
even when the height of the measured
edge
image is not coplanar, which highly
improved
the focusing accuracy. The experimental
results
demonstrate that the equipment has
a high
resolution and high speed, which can
meets
the needs of production measurement.
Key words: Inject Image measurement technology
Automatic inspection Edge extraction Focusing
============================================================
Editor : International Affairs Committee
Published by The Japan Society of Mechanical
Engineers
Shinanomachi-Rengakan Bldg, Shinanomachi
35,
Shinjuku-ku, Tokyo 160-0016, Japan
FAX : 81-3-5360-3508
All Rights Reserved, Copyright C 2008
The Japan Society of Mechanical Engineers
URL:http//www.jsme.or.jp [English Version]
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