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                  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)

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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)  To Establish Lubrication System for Micro-mechanical Systems
     (Source: JSME)

2)  A Large-Scale Simulation by Cell/B.E.Cluster (Source: JSME)
3)  Adaptive Control of Ultraprecision Machining Process using a Micro Thermo           Sensor (Source: JSME)
4)  Development of a Novel Disposable Laparoscopic Manipulator (Source: JSME)
5)  Short-Span Seeking of Hard Disk Drive via Multi-Objective Feed-Forward Control      (Source: JSME)
6)  Design and Motion Analysis of an In-pipe Robot with Adaptability to Pipe Diameters     (Source: CMES)
7)  Planning Approach for Product Family Based on Function-Structure Unit
    (Source: CMES)

8)  Fabrication Method of Binary Micro-structure Super-hydrophobic Surface Based      on Lotus Effect (Source: CMES)


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1) To Establish Lubrication System for Micro-mechanical Systems

     Shintaro Itoh, Nagoya University

 An understanding of nanorheological properties of liquid lubricant confined in nanometer-sized gap widths is necessary to establish a lubrication system for micro-mechanical systems, including MEMS devices, hard disk drive, micro-fluidic systems, and so on. However, few attempts have been made at clarifying the dynamic nanorheological properties of confined lubricant molecules. This is because the method for measuring the dynamic shear force has not been established. So, we have developed a new method of measuring dynamic shear force. This method enables us to measure the shear force with a detection limit of about 0.1 nN. The frequency of shear is able to set to several kHz. The gap is controlled with a resolution of 0.1 nm. Using this method we investigated the effect of confinement on the dynamic viscoelastic properties of perfluoropolyether lubricant film on a solid substrate. The results show that both viscosity and elasticity of the lubricant film increase drastically when the gap is decreased to a molecularly narrow width.

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2) A Large-Scale Simulation by Cell/B.E.Cluster

     Jun Igarashi, Kyushu Institute of Technology
     Yasuhiko Tanaka, Kitakyushu Foundation for the Advancement of Industry,                             Science and Technology (FAIS)

 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.

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3) Adaptive Control of Ultraprecision Machining Process using a Micro Thermo     Sensor

     Hayato Yoshioka, Tokyo Institute of Technology

 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.

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4) Development of a Novel Disposable Laparoscopic Manipulator

     Takeharu Kobayashi, Daiken Medical Co., Ltd

 This essay describes the development of a novel laparoscope manipulator using the medical linear actuators. The manipulator is composed of a Stewart-Gough Platform with six degrees of freedom and six hydraulic linear actuators, and can hold a general laparoscope. The arm part of the manipulator is lightweight, compact, producible at a low price, and sterilized. Therefore, the manipulator can be manufactured as a disposable item. The position of a laparoscope can be controlled through a joystick interface. This new concept produces the following excellent characteristics. First, it does not obstruct the surgeonfs operation. Second, setting the manipulator in the medical treatment site is easy. Finally, the manipulator need not be maintained. The position of a laparoscope can be controlled through a joystick interface.

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5) Short-Span Seeking of Hard Disk Drive via Multi-Objective Feed-Forward     Control

     Yoshiyuki Ishihara, Corporate Research & Development Center, Toshiba                              Corporation

 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.

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6) Design and Motion Analysis of an In-pipe Robot with Adaptability to Pipe     Diameters

     Li Peng, Ma Shugen, Li Bin, Wang Yuechao
     Chinese Academy of Science
     Ritsumeikan University

 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

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7) Planning Approach for Product Family Based on Function-Structure Unit

     Gong Jingzhong  Qiu Jing, Li Guoxi, Yang Shangfei, Wu Rui
     National University of Defense Technology

 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

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8) Fabrication Method of Binary Micro-structure Super-hydrophobic Surface     Based on Lotus Effect

     Zhang Honghai, Xie Dan, Liu Sheng, Gan Zhiyin
      Huazhong University of Science and Technology

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.

Key words: Lotus effect, Binary micro-structure, Super-hydrophobic surface,
                  Nonoimprinting


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Editor : International Affairs Committee
Published by The Japan Society of Mechanical Engineers
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The Japan Society of Mechanical Engineers
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