| ====================================================================== ENGINEERING NEWS IN BRIEF E-Mail Newsletter No.88 Issued by the Asian TOP Panel, April 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) ====================================================================== 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. ====================================================================== [Contents] 1) Cryogenic Cavitation Tunnel in JAXA (Source:
JSME) 1) Cryogenic Cavitation Tunnel in JAXA A thermodynamic effect in cavitation makes
a growth of cavity bubble delayed in cryogenic
fluids, and results in improving suction
performances and suppressing the cavitation
instabilities in rocket turbopump inducers.
Thus, quantitative estimations of the thermodynamic
effect in cavitation should be important
for the further improvement of inducers.
New cryogenic cavitation tunnel was constructed
at the Kakuda Space Center in the Japan Aerospace
Exploration Agency for a quantitative elucidation
on the thermodynamic effect in cavitation. This report introduces long-stroke and nanometer-resolution
piezoelectric actuators based on a
compact
hinge-mechanism of amplifying the displacement,
namely honeycomb-link mechanism. The
mechanism
is realized by using a plate patterned
on
an eccentric honeycomb. When an actuator
applies a longitudinal elongation to
each
cell in the plate, a relatively large
elongation
is produced in the perpendicular direction.
Because of the periodicity of the structure,
it is possible to build up compact
amplified-actuators.
A prototype XY stage of 84 mm × 84
mm ×
26 mm in size yielded a displacement
of about
400 um at a voltage of 150 V for each
axis
without mutual interference. 3) Analysis of Future Energy System in Japan using MARKAL Yutaka Tabe, Hokkaido University This paper introduces the MARKAL model as
one of analysis tools to evaluate the
long-term
change of energy system in a country,
and
describes an importance of establishment
of engineer network using energy system
analysis.
The MARKAL model is composed of energy
resources,
energy supply technologies, energy
ultimate
demand technologies and energy service
demands,
and these are connected by energy carriers.
The outline of the model and some examples
of parameter sets are explained. An
analysis
example, a study on the evolution of
energy
demand and supply toward the year 2050
and
on the potential benefits of nuclear
energy
utilization in Japan, is also presented.
In the energy system analysis, appropriate
modeling of the energy technologies
and setting
of parameters of each technology and
each
demand are extremely important. Therefore,
the engineer network using the energy
system
is significantly effective to develop
the
energy system model. Koji Miyazaki, Kyushu Institute of Technology 5) The Projection of World Heritage Site -The Support System for Removing the Snow on Shiretoko Crossroad- Soichiro Suzuki, Kitami Institute of Technology In July 2005, the Shiretoko peninsula was registered on UNESCO’s World Heritage list. The snow on Shiretoko crossroad has to be removed until ‘Golden week’ holidays for tourist. The snow removing work using a backhoe is very dangerous because of the heavy snow. We developed the support system of the snow removing work for the safety of the operator of the backhoe. This system can display the 3D virtual landscape under the snow by using a RTK-GPS. This system will be put to practical use in the near future. _________________________________________________________________________________________________________________________________ 6) The development of New Human-Symbiotic Robot “EMIEW2” Masashi Koga, Hitachi, Ltd. 7) Heat Transfer Analysis during a Curing Process for UV Nanoimprint Lithography Insoo Park, Si-Hyung Lim, Donghoon Shin, Kee Sung Lee,
Siyoul Jang, 8) Study of Impact Energy Propagation Phenomenon and Modal Characteristics of an Armored Vehicle Undergoing High Velocity Impact Man Hoi Koo1, Hong Seok Lim2, Hak In Gimm1 and Hong Hee Yoo2,* 9) Investigation and Design of a New Shock Absorbing
Device that Cooperates
between Two Colliding Objects Atsushi Kawaguchi1,*, Kai Sedlaczek2, Atsushi Kawamoto1 and Peter Eberhard2 Abstract : This paper deals with a new type of shock
absorbing device that cooperates between
two colliding objects. The new device
utilizes
a four-bar-chain-like articulated mechanism
with some possible actuations. The
devices
are assumed to be deployed in the pre-crash
phase (by sensing and identifying unavoidable
collisions) so as to provide an extended
deformable region between the two objects.
Moreover, by functioning like a four-bar-chain
mechanism, they produce a repulsive
effect
by pushing each other and sliding in
the
opposite lateral direction. To investigate
the capacity of the proposed articulated
shock absorbing mechanism, a standard
numerical
optimization technique called SQP and
a new
optimization technique called ALPSO
are applied.
ALPSO is an attractive method for solving
multimodal optimization problems based
on
Particle Swarm Optimization and constraint
treatment using an Augmented Lagrange
Method.
We demonstrate ALPSO and show its applicability
to this problem. The optimization process
automatically determines the mode of
the
operation and gives an estimation of
the
development potential of the new device.
Naeem Ullah Dar1, Ejaz M. Qureshi2,* and M.M.I Hammouda1 1. Department of Mechanical Engineering,
University of Engineering & Technology,; Abstract : Circumferential weld specifically in thin-walled
structures is a common joint type in
the
fabrication of structural members in
aerospace,
aeronautical and pressure vessel industries.
This type of weld joint suffers various
types
of weld-induced residual stress fields
(hoop
and axial) and deformation patterns
(axial
shrinkage, radial shrinkage). These
imperfections
have negative effects on fabrication
accuracies
and result in low strength welded structures
that can lead to premature failures.
To precisely
capture the distortions and residual
stresses,
computational methodology based on
three-dimensional
finite element model for the simulation
of
gas tungsten arc welding in thin-walled
cylinders
is presented. Butt-weld geometry with
single
"V" for a 300 mm outer diameter
cylinder of 3 mm thick is used. The
complex
phenomenon of arc welding is numerically
solved by sequentially coupled transient,
non-linear thermo-mechanical analysis.
The
accuracy of both the thermal and structural
models is validated through experiments
for
temperature distribution, residual
stresses
and distortion. The simulated result
shows
close correlation with the experimental
measurements.
11) Design and Experimental Study on Low-specific Centrifugal Fire Pumps Shi Weidong, Zhang Desheng, Lu Weigang, Gao
Weidong 12) A New Type Frictional Transducer Li Renjun, Liu Hongzhao, Wang Zhongmin, Li
Pengfei, 13) Research and Development of CAI System Based on Standard Solutions Yang Bojun, Tian Yumei, Tan Runhua, Majianhong The application process and the existing
arithmetic of standard solutions in
the innovation
design were discussed, then the arithmetic
and the flow of software that are suitable
for the CAI system were constructed.
With
the support framework of knowledge
database,
the arithmetic integrated the substance-field
(Su-F) analysis tool which was applied
to
model a technical or process problem
with
standard solutions tool, implemented
to acquire
a solution. During the development
of CAI
software product, static model built
based
on UML were used to construct the configuration
of system, and dynamic models were
used to
describe the behaviors of system components,
then achieved software system analysis.
The
standard solutions CAI software was
coded
with VC++ and XML_XSL, which have friendly
interfaces and can be used conveniently.
Under the help of this software, the
component
of a roller in the Chinese traditional
medicine
dropping pill packing is improved.
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