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Fast simulation of flexible multibody dynamics with electric-hydraulic drive system

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Theoretical & Applied Mechanics Letters 2013年第1期3卷 19-24页

作者： Etsujiro Imanishi takao Nanjo Mechanical Engineering Research Laboratory Kobe Steel LTD

Hardware in the loop simulation （HILS） has been investigated in the field of the multibody dynamics （MBD）, which combined the MBD simulation with the actual mechanical system. The fast simulation is necessary for the HILS system in order to require the real time simulation. This paper presents a fast simulation technique using the domain decomposition method with the iteration in the flexible multibody system in which flexible linkage system and electro-hydraulic drive system are coupled with each other. C 2013 The Chinese Society of Theoretical and Applied Mechanics.[doi：10.1063/2.1301301]

关键词： multibody dynamics simulation construction machineary parallel processing

Management of chronic disruption of the distal tibiofibular syndesmosis

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World Journal of Orthopedics 2011年第1期2卷 1-6页

作者： Wataru Miyamoto Masato takao Department of Orthopaedic Surgery Teikyo University School of MedicineTokyo 173-8605Japan

Disruption of the distal tibiofibular syndesmosis is frequently accompanied by rotational ankle fracture such as pronation-external rotation and rarely occurs without ankle *** such injury,not only inadequately treated or misdiagnosed cases,but also correctly diagnosed cases can possibly result in a chronic pattern which is more troublesome to treat than an acute *** paper reviews anatomical and biomechanical characteristics of the distal tibiofibular joint,the mechanism of chronic disruption of the distal tibiofibular syndesmosis,radiological and arthroscopic diagnosis,and surgical treatment.

关键词： Ankle Chronic injury Distal tibiofibular joint Distal tibiofibular syndesmosis Surgical treatment

Multi-Terabit Long-Haul Transmission System Utilizing Distributed Raman Amplification Technologies

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光学学报 2003年第S1期23卷 567-568页

作者： takao Naito Toshiki Tanaka Fujitsu Laboratories Ltd. 4-1-1 Kamikodanaka Nakahara-ku Kawasaki 211-8588 JapanFujitsu Laboratories Ltd. 4-1-1 Kamikodanaka Nakahara-ku Kawasaki 211-8588 Japan

Here we summarize multi-terabit long-haul transmission experiment and distributed Raman amplification (DRA) technologies. As well, we investigate the configuration of dispersion-managed fibers for the DRA-based system... 详细信息

关键词： EDFA for very it as of WDM DRA Multi-Terabit Long-Haul Transmission System Utilizing Distributed Raman Amplification Technologies OSNR

A genetic typing method for albino mutation in the Mongolian gerbil by PCR-RFLP analysis

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Integrative Zoology 2021年第3期16卷 429-432页

作者： takao UKAJI Masahiro A.IWASA Osamu KAI Department of Animal Science and Resources College of Bioresource SciencesNihon UniversityFujisawaJapan

INTRODUCTION The Mongolian gerbil(Meriones unguiculatus)has been used as an animal model for pharmacology(Wu et al.2008),parasitology(Lim et al.2004),and studies of reproduction(Kai et al.1995).The molecular mechanisms of several coat-color phenotypes are known in gerbils(Petrij et al.2001,2007).On the other hand,although albinism in gerbils was first reported by Matsuzaki et al.(1989),its molecular mechanism is still *** a previous study,we reported the establishment of the albino gerbil strain(strain code:MON/Num/c)as a closed colony and the agouti-colored strain(strain code:MON/Num/a)as *** albino strain had 4 nucleotide substitutions and 2 missense mutations(R77H in exon 1 and Q473R in exon 5)in the tyrosinase(Tyr)gene(Ukaji et al.2016).

关键词： al. colored analysis

Improvement of sail storage and deployment mechanism for spin-type solar power sail

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Astrodynamics 2020年第3期4卷 223-231页

作者： Osamu Mori Nobukatsu Okuizumi Toshihiro Chujo Yuki takao Institute of Space and A stronautical Science Japan A erospace Exploration AgencySagamihara 252-5210Japan Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo152-8550Japan Department of Aeronautics and Astronautics the University of TokyoTokyo 113-8654Japan

Deployable membrane structures are expected to be used for large area space structures,such as solar propulsion sails,magnetoplasma sails,drag-deorbiting sails,membrane antennas,and solar power *** are lightweight and can be compactly stored at *** achievement of the Japan Aerospace Exploration Agency(JAXA)was the successful deployment of a 200 m2 sail using centrifugal force in the IKAROS mission,which was the first solar propulsion sail-craft in *** has long been studying the technology of spin deployment of sail membranes,and is currently planning the spin deployment of a class sail larger than 2000 m2 as the next step in the development of the IK AROS *** paper discusses the unexpected behaviors during on-orbit sail deployment by IKAROS,as well as problems with the sail holding method,and proposes an improved sail storage structure and deployment mechanism for the OKEANOS mission.

关键词： solar sail solar power sail storage deployment IKAROS OKEANOS

Transfer of electrons on scratched iron surfaces:Photoelectron emission and X-ray photoelectron spectroscopy studies

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Friction 2018年第1期6卷 98-115页

作者： Yoshihiro MOMOSE Daisuke SUZUKI Keika TSURUYA takao SAKURAI Keiji NAKAYAMA Department of Materials Science Ibaraki University Ashikaga Institute of Technology Institute of Mesotechnology

We report the activation energy, ΔEa, for the quantum yield in thermally assisted photoelectron emission(TAPE) under 210-nm-wavelength light irradiation, and the associated X-ray photoelectron spectroscopy(XPS) results. Samples were cleaned only in acetone and scratched in air, water, methanol, ethanol, acetone, benzene, and cyclohexane. Glow curves, describing the temperature dependence of photoelectron emission(PE) quantum yield(emitted electrons/photon), Y, were obtained. A simple method of determining ΔEa using Y, called YGC, at seven temperatures up to 353 °C, for the same Y glow curve, was proposed. The ΔEa obtained using this method was almost the same as that obtained from Y for seven stationary temperatures(YST). For scratched samples, the TAPE was measured over two cycles of temperature increase and subsequent decrease(Up1, Down1 and Up2, Down2 scans) in the 25–339 °C range, and ΔE_a was obtained from YGC. The Arrhenius plot was approximated by a straight line, although a convex swelling peak appeared in the Up1 scan. ΔE_(aUp1) was in the 0.212–0.035 eV range, depending on the environment in which scratching was performed; ΔE_(aUp1) for water was much higher than that for acetone. This was explained in terms of the mode of the acid–base interaction between the liquid molecules and the hydroxyl group of Fe–OH. The values of ΔE_(aDown1), ΔEa Up2, and ΔE_(aDown2) were in the 0.038–0.012 eV range. The total count of electrons emitted during the Up1 and Up2 scans was found to decrease with increasing ΔE_(aUp1) and ΔE_(aUp2), respectively. ΔE_(aUp2) was found to increase with increasing presence of the FeO component in the analyzed Fe oxides. The convex swelling peak was attributed to the removal of carbon materials from the scratched surface and the effect of the increased electron density of the surface hydroxyl group of FeOH under the light irradiation.

关键词： thermally assisted photoelectron emission XPS real iron scratch-inducing environment Arrhenius activation energy environment molecule-surface hydroxyl group interaction

Study on Blade Surface Flow around Wind Turbine by Using LDV Measurements

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Journal of Thermal Science 2015年第2期24卷 131-139页

作者： Tinnapob Phengpom Yasunari Kamada takao Maeda Junsuke Murata Shogo Nishimura Tasuku Matsuno Division of System Engineering Mie University Division of Mechanical Engineering Mie University

This paper has attempted to study a mechanism of three-dimensional flow around a horizontal axis wind turbine(HAWT) rotor blade. An experimental study of the flow phenomenon in the vicinity of the wind turbine blade is a challenging endeavor. In this research, the HAWT model with 2.4 m diameter was tested in the large wind tunnel. The flow around the rotating blade surface was measured simultaneously for three velocity components, and two probes were used for the synchronized measurement of three-dimensional flow components. The local velocity was detected for the single seeding particle measured in the point where three pairs of laser beams intersected. Blade sections of interest in this study are composed of radial positions r/R = 0.3, 0.5 and 0.7. Optimum and low tip speed ratio flow characteristics were also compared. The velocity flow vector, skin friction coefficient and bound circulation were calculated from LDV measurements, and the experimental research showed reasonably and clearly the experimental results.

关键词： LDV measurement Sectional performance Wind turbine Boundary layer flow Span-wise flow

Is the Oriental Notion of ＂Using Sports to Nurture Guts＂ Understood in the Globalized World？

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Journal of Literature and Art Studies 2016年第11期6卷 1451-1457页

作者： toshiko SUGINO Noriko OKAMOTO Kogakuin University Tokyo Japan Tokyo International University Tokyo Japan

In the globalized world, sport exchanges and competitions are held extensively all over the world, international championships and the Olympics to name a few. However, there may be cases where purposes or philosophy behind sport are not necessarily shared in the world. In Japan, for example, not only sports are connected to physical abilities but also to mental strength or more precisely, konjo （guts or strong-wills）. This kind of mentality and a training method can be traced back to the Meiji Era （1868-1912） when new European sports were brought to Japan. In the 1960s and 70s, it became a fad to read comic books depicting how poor heroes-to-be painstakingly became famous players mastering skills while nurturing their guts. In the previous study, 39 college students out of 46 felt sports can nurture guts or strong wills even today. However, in the 9th FIEP European Congress in Bulgaria, some participants from the Eastern Europe expressed that this kind of Oriental notion was hard to grasp because it is so different from theirs. In this paper, we will show the results of a questionnaire, administered to 83 International students in Japan, investigating whether this notion of ＂Using Sports to Nurture Guts＂ is shared among them. Also, in the following study, we asked 23 non-Asian participants the same question via SNS and their answers will be shown qualitatively. Finally, we will suggest a new role of sports in this globalized world.

关键词： Oriental notion of sports Japanese sport comics non-Asians views of sport mentality

PIV Measurements of Flows around the Wind Turbines with a Flanged-Diffuser Shroud

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Journal of Thermal Science 2008年第4期17卷 375-380页

作者： Kazuhiko Toshimitsu Koutarou Nishikawa Wataru Haruki Shinichi Oono Manabu takao Yuji Ohya Dept.of Mechanical Engineering Oita National College of Technology Kawasaki Precision Machinery Ltd. Honda Motor Co. Ltd. Machine & Electronics Co. Ltd. Dept.of Mechanical Engineering Matsue National Collage of Technology Research Institute of Applied Mechanics Kyushu University

The wind turbines with a flanged-diffuser shroud -so called ＂wind lens turbine＂- are developed as one of high performance wind turbines by Ohya et al. In order to investigate the flow characteristics and flow acceleration, the paper presents the flow velocity measurements of a long-type and a compact-type wind turbines with a flanged-diffuser shroud by particle image velocimetry. In the case of the long type wind turbine, the velocity vec- tors of the inner flow field of the diffuser for turbine blades rotating and no blades rotating are presented at Rey- nolds number, 0.9x105. Fur^thermore the flow fields between with and without rotating are compared. Through the PIV measurement results, one can realize that the turbine blades rotating affects as suppress the disturbance and the flow separation near the inner wall of the diffuser. The time average velocity vectors are made on the av- erage of the instantaneous velocity data. There are two large vortices in downstream region of the diffuser. One vortex behind the flange acts as suck in wind to the diffuser and raise the inlet flow velocity. Another large vortex appears in downstream. It might be act as blockage vortex of main flow. The large blockage vortex is not clear in the instantaneous velocity vectors, however it exists clearly in the time average flow field. The flow field around the wind turbine with a compact-type flanged-diffuser shroud is also investigated. The flow pattern behind the flange of the compact-type turbine is the same as the long-type one. It means that the effect of flow acceleration is caused by the unsteady vortices behind the flange. The comparison with CFD and PIV results of meridional time-average streamlines after the compact-type diffuser is also presented.

关键词： wind turbine PIV wind energy flanged diffuser flow visualization