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Robotics, engineering, Science, and Technology (RESTCON), International Conference on

作者： Panart Khajornrungruang Thitipat Permpatdechakul Keisuke Suzuki Aran Blattler Yutaka Terayama Daiki Goto Pipat Phaisalpanumas Natthaphon Bun-Athuek Amornphun Phunopas Dept. of Intelligent and Control System Faculty of Computer Science and Systems Engineering Mechanical Science and Technology Division Kyushu Institute of Technology Iizuka-Shi Fukuoka Japan Dept. of Interdisciplinary Informatics Graduate School of Computer Science and Systems Engineering Mechanical Information Science and Technology Division Kyushu Institute of Technology Iizuka-Shi Fukuoka Japan Dept. of Production and Robotics Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangsue Bangkok Thailand Dept. of Intelligent and Control System Graduate School of Computer Science and Systems Engineering Mechanical Science and Technology Course Kyushu Institute of Technology Iizuka-Shi Fukuoka Japan Dept. of Industiral Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangsue Bangkok Thailand Dept. of Mechanical Engineering Technology College of Industrial Technology King Mongkut’s University of Technology North Bangkok Bangsue Bangkok Thailand

To directly investigate the dynamic nanoscale phenomenon on the surface being processed in wet conditions such as precision polishing, and cleaning in semiconductor industrial, an optical method for visualization and observation of each sub-100 nm sized particle that is moving on an interface such as a silica glass surface by applying an evanescent field have been proposing. Subsequently, we developed an experimental apparatus equipped with an optical microscopy system for verifying the moving particle observation method in a laboratory scale. This article introduces some experimentally direct observation results of duplicated wet processes.

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Evaluation of Associative Learning Based on Functional Connectivity in a Cultured Neuronal Network

Evaluation of Associative Learning Based on Functional Conne...

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International Symposium on Soft Computing and Intelligent systems (SCIS)

作者： Kai Hirokawa Suguru N. Kudoh Dept. of Human System Interaction Graduate School of Sci. and Tech. Lab. for Neuronal Intelligence Engineering (NIE LAB) Kwansei Gakuin University Sanda Hyogo Japan Dept. of Engineering Kwansei Gakuin University Lab. for Neuronal Intelligence Engineering (NIE LAB) Artificial Intelligence and Mechanical Engineering Course Sanda Hyogo Japan

In the brain, a large number of neurons interact with each other, and learning and memory take place while changing their functional structure. Therefore, in order to elucidate the mechanism of information processing in the brain, analysis focusing on functional connectivity between cells is necessary. In this study, we attempted to extract functional connections in the cultured neuronal network by repeated stimulation. In order to improve the accuracy of the extraction, we used a culture medium with a higher concentration of MgC1. As a result, the graph constructed by the extracted functional connections had small-world characteristics, indicating that this method may be effective for analyzing functional connections. In addition, we attempted to express the basic learning, associative learning, in the neuronal network. It was confirmed that repeated application of simultaneous stimuli enhanced the similarity of evoked responses by the two stimuli. These results indicate that learning is expressed by changes in functional connections, and that analysis of the specific changes in connections may help to elucidate the mechanism of information representation.

关键词： Electrodes Training Firing Neurons Focusing Information representation Information processing

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Tribology in mouthguard

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Toraibarojisuto/Journal of Japanese Society of Tribologists 2019年第7期64卷 406-412页

作者： Akagaki, Tomoharu Mechanical System Design Course Department of Industrial System Engineering National Institute of Technology Hachinohe College 16-1 Uwanotal Tamonoki Hachinohe-shi Aomori039-1192 Japan

Bruxism during sleep causes tooth wear and fractures, gum damage, and dental-repair-material fractures. So far no simple cures or controls have been found for bruxism. In order to prevent the bruxism-related tooth wear and fractures, a mouthguard mainly made of Ethylene-Vinyl-Acetate (EVA) has commonly been applied in clinical practiccs. However, it has been well known that EVA is easily worn out and perforated due to the sleep bruxism. Thus the friction and wear of the mouthguard are important problems in dental tribology. This paper outlines EVA's tribological properties: The friction and wear behaviors of EVA under dry and lubricated conditions, and the effects of laser-textured surface with pits on the friction and wear. © 2019 Japanese Society of Tribologists. All rights reserved.

关键词： Tribology

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Influence of punch spring back in powder die compaction by FEM analysis

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AIP Conference Proceedings 2024年第1期3086卷

作者： Mayu Hayashi Kenji Kodama Yukinori Taniguchi Student of Department of System Innovation Advanced Mechanical Engineering Course National Institute of Technology (KOSEN) Nara College 22 Yatacho Yamatokoriyama city Nara639-1080 Japan Department of Informatics and Mechanical Engineering NIT Toba1-1 Ikegamicho Toba city Mie 517-8501 Japan Department of Mechanical Engineering National Institute of Technology (KOSEN) Nara College 22 Yatacho Yamatokoriyama city Nara639-1080 Japan

The effects of tool stiffness on powder die compaction were investigated by performing FEM analysis of the inner flange shape compaction using a Drucker-Prager Cap model. The material parameters of atomized iron and ferrite powders were validated by comparing the results of uniaxial compaction tests with measurement from a die system. The results simulated influence of punch spring back during unloading and ejection. It was found that increasing the lower punch spring back caused a change in the shear stress during unloading and locally increased the residual stress.

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Fracture process analysis of notched brittle Metal based on mesoscopic plastic information Oriented to propose mechanism-based strength evaluation Methods;Example of Gray-Cast iron FC200

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engineering Failure Analysis 2025年

作者： Toyomitsu Harada Hiroshi noguchi Daisuke Sasaki Yuta Minami Takashi Yoshida Nobuya Sasaguri Department of Mechanical Engineering National Institute of Technology Kurume College 1-1-1 Komorino Kurume Fukuoka 830-8555 Japan Department of Mechanical Engineering Faculty of Engineering Kyushu University 744 Moto-oka Nishi-ku Fukuoka 819-0395 Japan Department of Materials System Engineering National Institute of Technology Kurume College 1-1-1 Komorino Kurume Fukuoka 830-8555 Japan Mechanical and Electrical Systems Engineering Advanced Course National Institute of Technology Kurume College1-1-1 Komorino Kurume Fukuoka 830-8555 Japan

A more rational characterization method for the strength of notched materials of heterogeneous brittle metals is desired than the present method without considering the real material behavior. This study aims to analyze the role of local plastic strain in the fracture process in notched brittle metals. In this study, we therefore conducted a four-point bending fracture test on gray cast iron with a semi-circular notch and performed fractography analysis of the fractured surfaces using an electron microscope and plastic strain analysis near the fractured surfaces using Electron BackScatter Diffraction. Based on the results, a model was proposed for the crack initiation and stable crack propagation mechanisms those clarified the role of the material structure and plastic strain on the crack behavior. This model divided the crack behavior into three stages. The first and second stages corresponded to the normal fracture process zone, wherein strain from the structure was the main cause of the crack propagation; however, in the third stage, the main cause was the elastic energy, which expressed the material as a continuum.

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Deformation in axial compression of aluminum tubular structures with ribs

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Keikinzoku/Journal of Japan Institute of Light Metals 2019年第8期69卷 379-386页

作者： Yokoya, Keisuke Miyazaki, Makoto Tojo, Yusuke Yamashita, Minoru Institute of Technology Nagano College Advanced Course of Production and Environment System National 716 Tokuma Nagano-shi Nagano381-8550 Japan Department of Mechanical Engineering Tokyo Institute of Technology [2-12-1 Ookayama School of Engineering Meguro-ku Tokyo152-8552 Japan Department of Mechanical Engineering National Institute of Technology Nagano Japan DENSO Aircool Corporation Japan Department of Mechanical Engineering Gifu University Japan

Dynamic compression behavior of various kinds of polygonal tubular structures with ribs are investigated. Square hollow structures and that with rib reinforcement of aluminum extrusions are in dynamic axial compression, using a drop hammer. Numerical simulation was also conducted for the wider variety of cross-sectional shapes and reinforcements. The effect of the axial length, cross-sectional shape and reinforcing rib arrangement on the deformation behavior were investigated. Comparable compressive force was obtained when the cross-sectional area of the structure is similar, even if the number of edges in cross-section increases from four (square) to eight. Rib reinforcement is very effective for the improvement of the crush or energy absorbing performance. Deformation behavior was successfully predicted by the numerical simulation. Numerical simulation of the compression of the various polygonal tubular structures with radial ribs was also carried out. The number of radial ribs in cross-section of the polygonal hollow structure has a positive relationship to the deformation constraint at corners and the torsional rigidity, consequently, the crush resistance increased. © 2019 The Japan Institute of Light Metals.

关键词： Reinforcement

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Determination of Mung Bean Seed Viability Change in Vacuum Packaging during Storage in Different Temperatures 1

Determination of Mung Bean Seed Viability Change in Vacuum P...

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1st International Conference on mechanical Electronic and Biosystem engineering, MEBSE 2018

作者： Faisal, M. Ahmad, U. Wulandani, D. Postharvest Technology Master Course Program Graduate School Bogor Agricultural University Indonesia Dept. of Mechanical and Bio-system Engineering IPB Bogor Agricultural University Indonesia

Mung bean seeds decreased their viability very fast during storage, especially in tropical area without proper packaging. The purpose of this study is to observethe decrease in viability of mung bean seeds during storage and to build a mathematical model for shelf life prediction. Dried mung bean seeds were vacuum packed and stored in Accelerated Shelf-life Testing chamber at five different temperatures of 30° C, 35° C, 40° C, 45° C, 50° C with approximately 80% in relative humidity, to facilitate rapid deterioration with different rate of physical and chemical change in the seed. The results show that there was an increase in moisture content and the germination decreased in different rates. Changes in values for some parametersof the seeds affected the viabilty of the seeds during rapid deterioration. The value of constant (k)for viability decreasing was calculated and used to build the mathematical model for predicting the shelf life of mung bean seeds during storage at any temperature. Using the developed model, it was observed that the shelf life of the Sriti variety of mung bean seeds in vacuum packaging could maintain 90% of germination level for 421 days or 14.3 months if stored at 20 °C, and for 173.37 days or 5.78 months if stored at 25 °C. © Published under licence by IOP Publishing Ltd.

关键词： Deterioration

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Fatigue strength simulation of natural porous structure

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International Journal of the Society of Material engineering for Resources 2018年第2期23卷 167-172页

作者： Tanaka, Yohei Masuyama, Tomoya Takahashi, Takeshi Iizuka, Hiroshi Course of Mechanical and Control Engineering Department of Advanced Engineering Course National Institute of Technology Tsuruoka College 104 Ino-oka sawada TsuruokaYamagata997-8511 Japan Course of Mechanical Engineering Department of Creative Engineering National Institute of Technology Tsuruoka College Higashine Yamagata999-3716 Japan Sanwa Yushi Co.Ltd. Higashine Yamagata999-3716 Japan Department of Mechanical System Engineering Faculty of Engineering Yamagata University 4-3-16 Jonan Yonezawa Yamagata992-8510 Japan

Rice hull which is one of the agricultural wastes in Japan has been demanded to reuse as the industrial materials. Rice hull silica carbon (RHSC) material, made from rice hull is produced by mixing rice hull powder with a phenol resin, and then carbonizing and the mixture in the nitrogen gas atmosphere at high temperatures. The RHSC is a porous carbon material utilizing natural porous structure originated from the rice hull. Therefore, reduction in environmental pollution is expected by the RHSC which is inexpensive and unique. In addition, a core competence of low friction coefficient, lubrication free, and high water resistance was reported for the RHSC in previous research. However, the RHSC has low reliability of strength originated potentially from the porous structure. Since the reliability of the RHSC is evaluated by a fatigue test which is required several weeks, calculating the fatigue strength by simulation analysis is useful. In this study, fatigue strength simulation analysis in natural porous structure was figured out and the size effect which influences the strength of the material was investigated. ©2018 Soc. Mater. Eng. Resour. Japan

关键词： Carbon

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Study on fluttering characteristics of articulated flat plate flag

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IOP Conference Series: Materials Science and engineering 2020年第1期920卷

作者： Masaki Yamagishi Hiroki Shida Department of Mechanical Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku Toyohashi 441-8580 JAPAN Electric & Mechanical System Engineering Advanced Course National Institute of Technology Nagaoka College 888 Nishikatakai Nagaoka Niigata 940-8532 JAPAN

For wind/water power generation, we have been trying to harness flow-induced vibration, and we used a flag as the oscillating body. The flag was made of flat plates joined by articulations. To achieve a suitable design in engineering, it is important to clarify the fluttering characteristics of this articulated flat plate. The fluttering characteristics were therefore investigated experimentally in a wind tunnel. In the experiment, several rectangular plates were tested in several conditions of stream-wise length, span-wise length, thickness, and density. To investigate the fluttering characteristics, the fluttering frequency in a uniform flow velocity was focused on. The fluttering mode was observed simultaneously. It was found that an articulated flat plate flutters in a uniform flow and has a steady fluttering mode. The fluttering frequency increases with increasing uniform flow velocity for all conditions. The frequency was higher when the streamwise-length was short, thickness was thin, and density was small. It was found that there were two modes of fluttering: node-less mode and one-node mode. Furthermore, the dimensional analysis was performed, and the results show that the non-dimensional number consisting of the Strouhal number, Reynolds number, and mass ratio became constant.

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Statistical estimation of S-N curves for high-strength steels based on their static mechanical properties

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Zairyo/Journal of the Society of Materials Science, Japan 2019年第3期68卷 258-264页

作者： Ito, Tsutomu Okada, Kenji Onosaka, Masaki Sakaida, Akiyoshi Mukoyama, Kazutaka Hanaki, Koushu Nakamura, Yuki Takahashi, Jun Sakai, Tatsuo Department of Mechanical System Engineering Faculty of Engineering Toyama Prefectural University Kurokawa Imizu939-0398 Japan National Institute of Technology Kagawa College Chokushi-Cho Takamatsu761-8058 Japan Mechanical Engineering Course Faculty of Advanced Engineering National Institute of Technology Kagawa College Chokushi-Cho Takamatsu761-8058 Japan Department of Mechanical Engineering National Institute of Technology Akashi College Uozumi-Cho Akashi674-8501 Japan Graduate School of Engineering Osaka University Yamadaoka Suita565-0871 Japan Department of Mechanical Engineering National Institute of Technology Toyota College Eisei-Cho Toyota471-8525 Japan Materials Characterization Department Denka Co. Ltd. 3-5-1 Asahi-machi Machida Tokyo194-8560 Japan Research Organization of Science and Technology Ritsumeikan University Nojihigashi Kusatsu525-8577 Japan

In this study, a statistical estimation of S-N curves for high-strength steels from their static mechanical properties was attempted. First, the fatigue data of high-strength steels were extracted from the "Database on fatigue strength of metallic materials" published by the Society of Materials Science, Japan (JSMS), and the S-N curves of respective steels were determined from the JSMS standard, that is, the "Standard evaluation method of fatigue reliability for metallic materials: Standard regression method of S-N curve". The correlations between the regression parameters obtained here and the static mechanical properties were investigated. Thus, significant correlations were found between the regression parameters and static mechanical properties (e.g., fatigue limit E and tensile strength sB). Based on these correlations, the S-N curves of high-strength steels were successfully predicted from their static mechanical properties, similar to structural carbon steels and aluminum alloys in previous studies. Moreover, from the distribution of the fatigue limit E, the percentile points for the estimated S-N curve were predicted. It was finally confirmed that 84 % of the S-N data series fall within the estimated interval of ±2s, where s represents the standard deviation of the fatigue limit. © 2019 Society of Materials Science *** right reserved.

关键词： High strength steel

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