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Effect of discharge duration and pulse frequency on surface characteristics using Whirling Electrical Discharge Texturing

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International Journal of Automation Technology 2014年第4期8卷 561-568页

作者： Lertphokanont, Vitchuda Oi, Masahiro Sato, Takayuki Ota, Minoru Egashira, Kai Yamaguchi, Keishi Yamada, Masayoshi Tomita, Yasuo Kyoto Institute of Technology Mechanical and System Engineering Matsugasaki Sakyo-ku Kyoto 606-8585 Japan Nissin Manufacturing Co. Ltd New Product Development Akasaka-85 Mineyamacho Kyoto 627-0006 Japan Nissin Manufacturing Co. Ltd Section of Horning Technology Akasaka-85 Mineyamacho Kyoto 627-0006 Japan Kyoto Institute of Technology Japan

Discharge duration and pulse frequency are studied to determine the optimum conditions for creating a single crater. In addition, the relationships between pulse frequency and surface characteristics using Whirling Electrical Discharge Texturing (WEDT) are determined. It is confirmed that the texture-area ratio and the total removal volume of craters, but not crater diameter or crater depth, can be controlled by adjusting pulse frequency. Moreover, after honing, surface characteristics decrease owing to the removal of protrusions. With honing, the surface roughness of the textured surface leads to a reduced friction coefficient as expected.

关键词： Surface roughness

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The effect of contact ratio on the cooling performance of an aluminum-foam heat sink with a solid aluminum core 12

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ASME 2014 12th Biennial Conference on engineering Systems Design and Analysis, ESDA 2014

作者： Shih, Wei-Hung Liu, Chin-Chia Hsieh, Wen-Hsin Medical Device Section Medical Devices and Opto-Electronics Equipment Department Metal Industries Research and Development Center Taiwan Department of Mechanical Engineering Advanced Institute of Manufacturing with High-Tech Innovations National Chung Cheng University Chia-Yi621 Taiwan

ISBN: (纸本)9780791845851

To enhance the cooling performance of a metal-foam heat sink, this work increases the surface area of the heat sink wall in contact with the electronic component by vertically placing a solid aluminum cylinder in the center (i.e., core) of an aluminum-foam heat sink. The contact ratio, defined as the ratio of the surface area of the extended heat sink wall in contact with the electronic component to the solid-fluid interface area inside the aluminum-foam heat sink, was systematically varied to experimentally investigate the heat transfer characteristics. The experimental results on the measured Nusselt number, solid-phase and gas-phase temperatures and temperature difference between the solid and gas of the aluminum foam under different contact ratios were reported and discussed in this work. Copyright © 2014 by ASME.

关键词： Electronic cooling

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Residual stress and bead profile analysis of pulsed Nd:YAG laser lap welding

Residual stress and bead profile analysis of pulsed Nd:YAG l...

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2nd International Conference on engineering and Technology Innovation 2012, ICETI 2012

作者： Hung, Tsung-Pin Hsu, Chao-Ming Lin, Ah-Der Kuang, Jao-Hwa Department of Mechanical Engineering National Sun Yat-Sen University Kaohsiung 80424 Taiwan Mold and Precision Machining Technology Section Micro/ Meso Mechanical Manufacturing R and D Department Metal Industries Research and Development Centre Taiwan Department of Mechanical Engineering National Kaohsiung University of Applied Science Kaohsiung 80778 Taiwan Department of Mechanical Engineering Cheng-Shiu University Taiwan

ISBN: (纸本)9783037856123

The weld bead temperature distribution and shape during pulsed Nd:YAG laser lap welding are studied. A volumetric heat source model is derived to include the surface flux and the keyhole heat transfer effects in the pulsed laser lap welding process. The proposed pulsed laser heat transfer mode is employed in a simulation with the commercial finite element software Marc. The numerically computed results of the weld pool dimensions are compared with the experimental results. The comparison shows a good agreement between the simulated and measurement results, indicating that the proposed model is feasible. The results reveal that the pulse duration and spot pitch have considerable influence on the temperature field distribution and the residual stress distribution. © (2013) Trans Tech Publications, Switzerland.

关键词： Pulsed lasers

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Analysis of the Characteristics of the Pneumatic Active Suspension System in Shinkansen

Analysis of the Characteristics of the Pneumatic Active Susp...

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Society of Instrument and Control Engineers Annual Conference

作者： Kenji Fujino Nobuaki Yamamoto Koji Taniguchi Chongho Youn Toshiharu Kagawa Research and Development Center of JR East Group EAST JAPAN RAILWAY COMPANY Engineering Department TOKYO METER CO. LTD Manufacturing Headquarters Engineering & Technical Research Department Project Management Section JAPAN TRANSPORT ENGINEERING COMPANY Precision and Intelligence Laboratory Tokyo Institute of Technology

ISBN: (纸本)9781467322591

A pneumatic system is used in a railway vehicle in a lot of elements such as the brake, suspension, and doors. However, the design of a pneumatic system for a railway vehicle was decided so far by experience and past results, and evaluation regarding the unsteady characteristic of a pneumatic system had not yet been done. In a Shinkansen railway vehicle, the active suspension is used to improve the riding comfort at high-speed operation. However, examination of the unsteady characteristic of an active suspension is insufficient. In this study, we measured pressure and flow rate of the active suspension pneumatic system of a Shinkansen railway vehicle in real time, and verified the validity of that system design. To obtain knowledge for promotion of efficiency and cost reduction, the pneumatic system was modeled and simulated. The pressure pulsation of the pipe was simulated by changing the pipe diameter and the tank capacity. Then, we suggested the effective pneumatic system for active suspension. We really put this system on a railway vehicle and made clear that we could achieve lightweight and efficiency from result of measurement.

关键词： Pneumatic system Active suspension Railway vehicles Efficiency

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Embedded type of MLCCs for direct Cu wiring process: Influence of related stress generated by the embedding process of MLCCs

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Journal of Japan Institute of Electronics Packaging 2011年第5期14卷 363-366页

作者： Sanada, Yukio Taseda, Yasunori R and D Section 1 Component JISSO Engineering Department Fukui Murata Manufacturing Co. Ltd. 13-1 Okamoto-cho Echizen-shi Fukui 915-8601 Japan Capacitor Division 1 Technical Development Section Component Business Unit 1-10-1 Higashikotari Nagaokakyo-shi Kyoto 617-0832 Japan

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Control algorithms for stable range-of-motion behaviours of a multi degree-of-freedom robot

Control algorithms for stable range-of-motion behaviours of ...

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International Conference on Autonomous and Intelligent Systems (AIS)

作者： Blake Beckman Micheal Trentini Jeff Pieper Autonomous Intelligent Systems Section Defence Research and Development Canada Medicine Hat AB Canada Department of Mechanical and Manufacturing Engineering University of Calgary Calgary AB Canada

The requirement for increased mobility of unmanned ground vehicles (UGVs) operating in urban settings must be addressed if robotic technology is to augment human efforts in military relevant roles and environments. In preparation for this role, Defence R&D Canada - Suffield is exploring novel mobility platforms that use intelligent mobility algorithms to improve robot mobility in unknown highly complex terrain. Robotic platforms often appear conceptually simple. Despite this appearance, the demands on these systems remain extremely ambitious while retaining the need for control systems to handle the many actuator degrees-of-freedom and numerous sensor inputs. Linear control techniques applied to a nonlinear multi degree-of-freedom vehicles are effective in controlling system behaviours in limited conditions. However, in unrestricted conditions, the nonlinear nature of the control problem and impracticality of model-based control of such a complex system have required the investigation of alternative control methods. This paper discusses linear control techniques applied to a multi degree-of-freedom robot in simulation and alternative nonlinear techniques.

关键词： Actuators Vehicles Hip Mathematical model Robots Least squares approximation Knee

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Chelate effect on the synthesis of carbon supported Pt nanoparticles for PEMFC anodes

Chelate effect on the synthesis of carbon supported Pt nanop...

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作者： Liu, Shyh-Jiun Huang, Chia-Hung Hwang, Weng-Sing Lee, Der-Yuan Department of Greenery Technology National Unversity of Tainan 700 Taiwan Metal Industries Research and Development Centre Surface Engineering and Heat Treatment Section Micro Meso Mechanical Manufacturing RandD Department Kaohsiung 811 Taiwan Department of Materials Science and Engineering National Cheng Kung University Tainan Taiwan Department of Environmental Resource Management Chia-Nan University of Pharmacy and Science Tainan Taiwan

ISBN: (纸本)9789748257747

Colloidal suspensions of spherical crystalline Pt nanoparticles with a narrow size distribution were synthesized using a microwave synthesis process. Analogous Pt-complexes (Pt(dien)2+, Pt(trien)2+, and Pt(en)22+. where dien = diethylenetriamine, trien triethylenetetraamine, en ethylenediamine) were deposited onto Vulcan XC-72 carbon powder to obtain Pt/C-x catalysts (x = 3, 4, and 22 represents the coordination number of the chelating agent). The Pt/C-x catalysts were evaluated under PEMFC conditions. X-ray diffraction and transmission electron microscopy were used to characterize the Pt/C-x catalysts. It was found that the Pt nanoparticles were uniform in size and highly dispersed on the carbon black supports. The chelating agents were expected to improve the growth of Pt particle size as well as the dispersion of Pt nanoparticles. In the PEMFC experiments, the mass-specific current density and mass-specific power density of the catalysts were as high as that of the commercial 20wt % Pt/C-ETEK catalyst.

关键词： Synthesis (chemical)

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Chelate Effect on the synthesis of carbon supported Pt nanoparticles for PEMFC anodes

Chelate Effect on the synthesis of carbon supported Pt nanop...

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Energy and Sustainable development

作者： Shyh-Jiun Liu Chia-Hung Huang Weng-Sing Hwang Der-Yuan Lee Department of Greenery Technology National University of Tainan Taiwan Department of Materials Science and Engineering National Cheng Kung University Tainan Taiwan Surface Engineering and Heat Treatment Section Micro/Meso Mechanical Manufacturing R&D Department Metal Industries Research and Development Centre Kaohsiung Taiwan Department of Environmental Resource Management Chia Nan University of Pharmacy and Science Tainan Taiwan

ISBN: (纸本)9781424485635

Colloidal suspensions of spherical crystalline Pt nanoparticles with a narrow size distribution were synthesized using a microwave synthesis process. Analogous Pt-complexes (Pt(dien) 2+ , Pt(trien) 2+ , and Pt(en) 2 2+ . where dien = diethylenetriamine, trien = triethylenetetraamine, en = ethylenediamine) were deposited onto Vulcan XC-72 carbon powder to obtain Pt/C-x catalysts (x = 3, 4, and 22 represents the coordination number of the chelating agent). The Pt/C-x catalysts were evaluated under PEMFC conditions. X-ray diffraction and transmission electron microscopy were used to characterize the Pt/C-x catalysts. It was found that the Pt nanoparticles were uniform in size and highly dispersed on the carbon black supports. The chelating agents were expected to improve the growth of Pt particle size as well as the dispersion of Pt nanoparticles. In the PEMFC experiments, the mass-specific current density and mass-specific power density of the catalysts were as high as that of the commercial 20wt % Pt/C-ETEK catalyst.

关键词： X-ray imaging Anodes Charge coupled devices

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development of new coated carbide grade "ACE COAT AC820P" and "AC830P" for steel turning

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SEI Technical Review 2009年第69期 66-71页

作者： Kojima, Chikako Imamura, Shinya Tsuda, Keiichi Sakamoto, Akira Tsukimori, Yasuo Okada, Yoshio Omori, Naoya Morimoto, Hiroyuki Kimura, Norihide Tool Materials Development Group Material Development Department Sumitomo Electric Hardmetal Corp. Japan Advanced Material Development Group Material Development Department Sumitomo Electric Hardmetal Corp. Japan Manufacturing Development Group Sumitomo Electric Hardmetal Corp. Japan Products Development Section Engineering Development Hokkaido Sumiden Precision Co. Ltd Japan

Sumitomo Electric Hardmetal Corporation has newly developed a coated carbide grade "ACE COAT AC820P" and "AC830P." AC820P is a general grade used for a wide range of steel turning from highly-efficient continuous machining to interrupted rough machining. On the other hand AC830P, is used exclusively for heavy machining and interrupted machining. Both AC820P and AC830P are doubled in the tool life and improved in the reliability compared with conventional grades. AC820P and AC830P have successfully achieved such properties by optimizing the originally developed chemical vapor deposition (CVD) coating technology, "Super FF Coat," which consists of titanium film with fine, smooth surface and alumina film with a accurately cemented carbide substrate. By applying the new surface treatment technologies to AC820P and AC830P, Sumitomo Electric Hardmetal has significantly reduced chippings and damages of cutting edges, which used to be frequently caused during steel turning, preventing irregular wear and tool life shortening. Currently, the authors have also developed a highly-efficient, versatile chip breaker, "GE type." The combination of all the excellent technologies of ACE COAT AC820P and GE type, tool life and machining efficiency have remarkably improved. With the coated carbide series including the three steel turning grades: "AC820P" for general machining, "AC830P" for interrupted machining and "AC700G" for high-speed and continuous machining, wide-ranging needs from customers who wish to improve their productivity and cost efficiency of steel turning will be adequately met.

关键词： Chemical vapor deposition

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Environment Classification for Indoor/Outdoor Robotic Mapping

Environment Classification for Indoor/Outdoor Robotic Mappin...

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Canadian Conference on Computer and Robot Vision, CRV

作者： Jack Collier Alejandro Ramirez-Serrano Autonomous Intelligent Systems Section Defence Research and Development Canada Medicine Hat AB Canada Department of Mechanical & Manufacturing Engineering University of Calgary Calgary AB Canada

We present a novel perception system for mapping of indoor/outdoor environments with an unmanned ground vehicle (UGV). The system uses image classification techniques to determine the operational environment of theUGV (indoor or outdoor). Based on the classification results, the appropriate mapping system is then *** features are extracted from video imagery andused to train a classification function using supervisedlearning techniques. This classification function is thenused to classify new imagery. A perception module observesthe classification results and switches the UGV's perception system, according to current needs and available (reliable) data as the UGV transitions from indoors to outdoors or vice versa. A terrain map that exploits GPS and Inertial Measurement Unit (IMU) data is used when operatingoutdoors, while a 2D laser based Simultaneous Localization and Mapping (SLAM) technique is used when operating indoors. Globally consistent maps are generated bytransforming the indoor map data into the global referenceframe, a capability unique to this algorithm.

关键词： Robots Simultaneous localization and mapping Land vehicles Image classification Feature extraction Data mining Switches Global Positioning System Measurement units Laser transitions

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