======================================================================                   ENGINEERING NEWS IN BRIEF                         E-Mail Newsletter                                No.84              Issued by the Asian TOP Panel, December 2008            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 2008. ====================================================================== [Contents] 1)  Fast Scanning Two-Dimensional Laser Probe for Radio Frequency MEMS      Resonators (Source: JSME) 2)  Spreading Open Source World in the CFD Community (Source: JSME) 3)  Sensors Using Sound at Audible or Lower Frequencies (Source: JSME) 4)  Gas Diffusion Layer for Polymer Electrolyte Fuel Cells ?Development of     “SIGRACET HyAmp” at SGL Group− (Source: JSME) 5)  Japanese Experimental Module “KIBO” (Source: JSME) 6)  Development of Computer Aided Test System for Vehicle Electric Brake     (Source: CMES) 7)  Research and Development of Automatic Bulk Cargo Equipment in Modern      Ports (Source: CMES) 8)  Research on Prediction Maintenance Time Optimization for Equipment in Power      Plant (Source: CMES) 9)  Analysis of Stress-Stain Relationship of Nano Structures According to the Size      and Crystal Orientation by Using the Molecular Dynamics Simulation      (Source: KSME) 10) A Study on the Improvement of Surface Roughness of Impeller by Selection of       Tool Path and Posture and Control of Feedrate (Source: KSME) 11) Heat Transfer Characteristics and Pressure Drop in Straight Microchannel of       the Printed Circuit Heat Exchangers (Source: KSME) ======================================================================== 1)Fast Scanning Two-Dimensional Laser Probe for Radio Frequency MEMS    Resonators Ken-ya Hashimoto, Chiba University  A fast-scanning two-dimensional laser probe was developed for diagnosis of radio frequency (RF) micro-electro-mechanical system (MEMS) resonators. The Sagnac interferometer was introduced for the selective detection of RF vertical motion associated with vibration. A high-pass characteristic of the interferometer makes the measurement very insusceptible to the low-frequency vibration. Combining such a feature with advanced scanning technique and optimized detection system, we were successfully able to maximize the scanning speed without sacrificing the signal-to-noise ratio and sensitivity of the measurement. Since the interferometer output is phase-sensitive, we can apply various image processing techniques in the two-dimensional wavenumber domain. Currently the system operates in the frequency range from 10 MHz to up to 2.5 GHz, and achieved spatial resolution is about 1 ?m. The system was applied to the characterization of RF MEMS resonator. We could visualize the vibration pattern for 500´700 points in 10 minutes with high spatial resolution and sensitivity, and effectiveness in device diagnosis was demonstrated. ======================================================================== 2) Spreading Open Source World in the CFD Community      Shin-ichiro Wakashima, Ichinoseki National College of Technology  Recently many open-source and free softwares have been developed in the world. In the community of computational fluid dynamics, some software become useful and reliable tools for researchers and developers, and are competing with commercial software functionally. In addition, their user’s community widely spread all over the world and development of the software has been steadily continued on their demand. In this topic, some of such CFD softwares (solvers and pre/post softwares) are shortly introduced. Use of such free and functional CFD software will be suitable for newbie of the CFD researchers and cost-effective for developers. ======================================================================== 3) Sensors Using Sound at Audible or Lower Frequencies      Ippei Torigoe, Kumamoto University  Ultrasound measurement is a substantial area of research and industry; however measurement using audible or even lower frequencies, in contrast, has had significantly less attention. However this does not necessarily mean that audible sound is not useful in measurement. In this article we will show several examples of such sensors using audible or lower frequency sound: a volume meter using sound, a surface area meter using sound, and an acoustical leak tester. Generally speaking, measurement using audible sound is based on the phenomenon in which the acoustic impedance changes in accordance with the change in the physical quantity to be measured, while most of ultrasound measurements utilize the wave propagation phenomenon. Measurements using audible sound, the examples in this article also, thus boil down to the question how to measure the acoustic impedance accurately, eliminating the effect of other influences. ======================================================================== 4) Gas Diffusion Layer for Polymer Electrolyte Fuel Cells ?Development of “SIGRACET      HyAmp” at SGL Group−      Makoto Murata, CEO of MFC Technology Inc. SGL Group has recently developed HyAmp series in their SIGRACENT GDLs (Gas Diffusion Layers for Polymer Electrolyte Fuel Cells). These new GDLs have improved uniformity and excellent capability in its water management. ======================================================================== 5) Japanese Experimental Module “KIBO”      Takayuki Shimoda, Japan Aerospace Exploration Agency (JAXA)  International Space Station (ISS) is an international facility where various experiments under specific environment in space are conducted to progress science and technology.Japanese experimental module "KIBO" was carried to ISS by two Space Shuttle flights in 2008, and pressurized system was completed. the other flight will carry exposed facilites in 2009 and the whole "KIBO" system will be completed.“KIBO” is composed of six modele-Pressurized Modele, Experiment Logistics Module-Pressurized Section, Exposed Facility, Experiment Logistics Module-Exposed Section, Manipulator, and Inter-orbit Communication System.Japanhas obtained own manned facilites on orbit now. Many fruitful results under space specific environments are expected to be obtained in the facility during the next ten years and Japan can proceed to the future manned space development based on the success of “KIBO”. ======================================================================== 6) Development of Computer Aided Test System for Vehicle Electric Brake      Jiang Hong , Chen Liao, Qi Chenyu, Zhou Kongkang, Shi Ruikang,       Jiangsu University  Based on electric brake test specifications and evaluation system, structure of the computer aided test (CAT) system for vehicle electric brake is designed. A speed variable motor driving friction disc is to simulate vehicle brake drum’s rotation at different speeds. The installation mechanisms for electric brake and electromagnet are designed respectively. Pneumatic separation equipment is employed to realize automatic test conveniently. Based on the multifunction data acquisition card (DAQ) and graphical programming language LabVIEW, a scheme of vehicle electric brake virtual system is proposed. A CAT system for the electric brake performance is developed. The testing of electric brake torque, magnetic force and friction is realized. Finally based on the communication interface of LabVIEW and SQL Server, the integration and data sharing of the CAT system and the CAD system are realized. The system is verified. And the two years’ operation shows that the electric brake performance testing system based on virtual instrument is qualified for the test. The test result is also qualified for the analysis requirement. Key words: Electric brake   Computer aided test   LabVIEW ======================================================================== 7) Research and Development of Automatic Bulk Cargo Equipment in Modern     Ports      Bao Qifan, Shanghai International Port (Group) Co., Ltd  The Group makes good use of the key technologies and principals of automatic grab ship unloader, automatic loading machines, and automatic bucket stacker and reclaimer for bulk cargo which were developed and applied in Shanghai Port, such as materials outline of a long-range detection, automatic control technologies of bulk cargo handling facilities suitable for bulk cargo ship and bulk yard, intelligent decision-making, computer networks etc., and implementation of efficient automatic loading and unloading operations of bulk cargo port operations in the port. The research and application enable to achieve management and control integration of automated operations creatively and establish a solid foundation for building automatic fully bulk cargo terminal. Key words: Bulk cargo equipment of port   Detection of material figure in long distance   Auto-control   Intelligent assistant decision making ======================================================================== 8) Research on Prediction Maintenance Time Optimization for Equipment in     Power Plant      Li Jianlan, Huang Shuhong,       Huazhong University of Science & Technology  Based on the analysis of equipment’s maintenance and fault, a prediction maintenance time optimization model was proposed, which brought forward the unit’s running benefit as objective function by synthesizing the factors of generating unit cost, electricity selling price, unit generating electricity amount, maintenance expense, break down loss and saved maintenance cost because of prolonging maintenance interval from the point of equipment’s life cycle. The model compared the benefit and risk from equipments’ running at different maintenance time, and took the time with maximal benefit as optimization maintenance time. The example of feed water pump’s optimization maintenance time validates the model. Key words: Equipment in power plant   Prediction maintenance time optimization   Running benefit   Weibull distribution =================================================================== 9) Analysis of Stress-Stain Relationship of Nano Structures According to the     Size and Crystal Orientation by Using the Molecular Dynamics Simulation      Yong-Soo Kang, Hyun-Gyu Kim,       Seoul National University of Technology  In this paper, the molecular dynamics (MD) simulations are performed with single-crystal copper blocks under simple shear and simple tension to investigate the effect of size and crystal orientation. There are many variances to give influences such as deformation path, temperature, specimen size and crystal orientation. Among them, the crystal orientation has a primary influence on the volume averaged stress. The numerical results show that the volume averaged shear stress decreases as the specimen size increases and as the crystal orientation changes from single to octal. Furthermore, the Schmid factor and yield stress for crystal orientation are evaluated by using the MD simulation on the standard triangle of stereographic projection. Key words: Molecular Dynamics, Crystal Orientation, Face-Centered Cubics, EAM(Embedded-Atom Method), Schmid Factor, Stereographic Projection =================================================================== 10) A Study on the Improvement of Surface Roughness of Impeller by      Selection of Tool Path and Posture and Control of Feedrate      Jong Dae Hwang, Ji Young Oh, Yoon Gyo Jung, Changwon,      National University  5-axis NC machining has a good advantage of the accessibility of tool motion by adding two rotary axes. It offers numerous advantages such as expanding machining fields in parts of turbo machineries like impeller, propeller, turbine blade and rotor, reasonable tool employment and great reduction of the set-up process. However, as adding two rotary axes, it is difficult to choose suitable machining conditions in terms of tool path, tool posture, feedrate control at a tool tip and post-processing. Therefore in this paper, it is proposed to decide suitable machining condition through an experimental method such as adopting various tool paths, tool postures, and feedrate types. Machining experiment on AL7075 for impeller is performed to define suitable machining condition and measurement of surface roughness on machined surfaces depended on each machining condition is performed. By defining suitable machining condition, we should have conclusion as improving the surface quality in the aspect of surface roughness and machined shape of surface. Key words: 5-Axis Machining, Post-Processor, Feedrate, Machining Trajectory, Tool Posture, Surface Roughness ============================================================ 11) Heat Transfer Characteristics and Pressure Drop in Straight Microchannel      of the Printed Circuit Heat Exchangers      Yoon-Ho Kim, Jung-Eun Seo, Young-jong Choi, Kyu-Jung Lee,       Korea University  The performance experiments for a microchannel printed circuit heat exchanger (PCHE) of high-performance and high-efficiency on the two technologies of micro photo-etching and diffusion bonding were performed in this study. The microchannel PCHE were experimentally investigated for Reynolds number in ranges of 100 ~ 700 under various flow conditions in the hot side and the cold side. The inlet temperatures of the hot side were conducted in range of 40℃ ~ 50℃ while that of the cold-side were fixed at 20℃. In the flow pattern, the counter flow was provided 6.8% and 10 ~ 15% higher average heat transfer rate and heat transfer performance than the parallel flow, respectively. The average heat transfer rate, heat transfer performance and pressure drop increases with increasing Reynolds number in all the experiment. The increasing of inlet temperature in the experiment range has not an effect on the heat transfer performance while the pressure drop decreases slightly with that of inlet temperature. The experimental correlations to the heat transfer coefficient and pressure drop factor as a function of the Reynolds number have been suggested for the microchannel PCHE Key Words: Microchannel, Printed Circuit Heat Exchanger, Micro Photo-Etching, Diffusion Bonding ============================================================ 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]

 

Please feedback us! wwwadmin@jsme.or.jp All Rights Reserved, Copyright (C) 2008, The Japan Society of Mechanical Engineers.