| ====================================================================== ENGINEERING NEWS IN BRIEF E-Mail Newsletter No.86 Issued by the Asian TOP Panel, February 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) To Establish Lubrication System for Micro-mechanical
Systems ======================================================================== 1) To Establish Lubrication System for Micro-mechanical
Systems The Cell Broadband Engine (Cell/B.E.) in
the PLAYSTATION3 (PS3) game console
is a
multi-core processor that has high-performance
floating-point computation capability.
We
constructed Cell/B.E cluster that consisted
of 12 PS3s, and performed a large-scale
neural
network simulation. The Cell B.E. cluster
calculated the neural network consisting
of 100 thousands of neurons 73 times
faster
than a personal computer. Also, the
Cell/B.E.
cluster showed linear scalability as
the
number of the PS3s increased from one
to
twelve. This is because data transfer
time
between the PS3s was relatively small
for
calculation time of the neuronal activity.
The result suggests that the Cell/B.E.
cluster
may scale its performance for the neural
network simulation by a further increase
in the number of the PS3s. The demands of fine-machining processes are
continually increasing in a wide range of
industries. This paper introduces an adaptive
control of ultraprecision machining process
with a micro thermo sensor. The sensor is directly mounted on rake face
of a diamond tool using semiconductor
fabricating
process. Because of small thermal capacity and short
distance from tool edge the sensor
can detect
thermal behavior with quick response
during
machining process. The evaluating tests with an ultraprecision
face turning lathe shows that the sensor
has superior performance to monitor
thermal
behavior near the cutting point. Furthermore an adaptive control system based
on the monitored signal is newly developed. The results of actual machining tests confirmed
that the developed micro sensor can
enable
an adaptive control of ultraprecision
machining
process. In this topic, some of the earlier studies
of short-span seeking in Hard Disk
Drive
(HDD) and a new design method for a
feed-forward
input of short-span seeking proposed
by the
authors are introduced. The proposed
method
is a multi-objective feed-forward control
that specifies the speed of seeking
control
and frequency components of feed-forward
input by using H2/H∞ norm and smoothness of feed-forward input
by using JERK (rate of acceleration
change).
In this method, all specifications
mentioned
above are included in the multi-objective
optimization problem that is defined
by using
LMIs, and we can obtain the optimal
feed-forward
input by solving the LMIs. The obtained
feed-forward
input can achieve faster seeking than
conventional
methods, and prevents the vibration
of the
actuator resonances. The effectiveness
of
the proposed method is verified by
an experiment
using an actual HDD, and a part of
the experimental
result is shown in this topic. 6) Design and Motion Analysis of an In-pipe
Robot with Adaptability to Pipe Diameters For the purpose of pipe inspection, an adaptive mobile mechanism is proposed and a robot based on this mechanism is designed and developed. Due to the unique transmission mechanism the robot has the adaptability to the change of pipe diameters, while number of the driving actuator does not increase. When the robot encounters a step, the adaptive mobile mechanism of the robot will change its working mode to surmount the obstacle. Compared to classical screw-driven robots, this robot does not employ the link-type configuration, but only uses one actuator to solve the low capability of surmounting obstacle. The observed rotation problem of the supporting parts is solved by the kinematical analysis of the robot. Basic experiments are performed to testify the adaptability and efficiency of the robot. Key words: Adaptive mobile mechanism In-pipe robot Mechanical design Motion analysis Screw-driven To support better product variety design oriented to customer, a planning approach for product family based on function-structure (FS) unit was presented. In this approach, for basic function and extending function of product family from the clustering of customer requirements, function and structure were decomposed by iterative mapping of function-behavior-structure (FBS), so as to build multi-level FS units. Afterwards, characteristic parameters and value range of product family and its FS units were resolved by the method of quality function deployment (QFD). And the method which combined function flow with IDEF0 was applied to construct function model of bottom FS units for FBS-based FS decomposition model of product family. In addition, based on this function model, multi-level FS modules of product family were established by pedigree clustering, and basic FS modules and extending FS modules were fixed on. Thus basic module families and extending module families were constructed by integrating structure of FS unit and its characteristic parameters, and eventually product family planning was realized. Finally, this method was applied to product family planning of stacking crane, where FS modules of stacking and its BOM model of product family was founded, and the feasibility and validity of the method were proved. Key words: Function-structure unit Function-structure module product family planning Zhang Honghai, Xie Dan, Liu Sheng, Gan Zhiyin This approach presented fabrication and replication
technology of binary micro-structure
based
on lotus effect. Aluminum template
had been
produced by means of anodic oxidation.
Plastic
micro-channels were pressed with above
template
by nanoimprinting lithography, furthermore,
silicon based bionic functional structures
were attained by NIL, reactive ion
etching
combined silane and alkyl ketene dimmer
treatment.
According to surface contact angle
test results,
plastic and Si structure all reveal
super-hydrophobic.
Therefore, the presented research results
demonstrate the technology is applicable
for functional surface shape modification
of MEMS including micro-fluidic devices,
micro-sensors and micro-actuators,
and it
has potential applications on reducing
friction
and preventing stiction.
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