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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.

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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.

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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.

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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.

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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F Stent Anti-compression, Genetic algorithm (GA), Radial basis function neural network, Optimization

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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

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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

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