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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Okamoto, Atsushi Yamada, Takafumi Advanced Mechanical and Control System Engineering Course National Institute of Technology Tsuyama College 624-1 Okayama Numa Tsuyama708-8509 Japan Associate Professor Department of Integrated Science and Technology National Institute of Technology Tsuyama College 624-1 Okayama Numa Tsuyama708-8509 Japan

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

In this study, incompressible flow fields around a NACA0012 airfoil were numerically simulated at low Reynolds number for a Mars environment. For mesh generation, the standard Open FOAM utilities block Mesh and snappy HexMesh were used. Using those meshes and pisoFoam, which is PISO method-based analysis solver, NASA wind tunnel test conditions were numerically simulated in the Earth environment and obtained a similar lift gradient as in the experiment up to the stall. Then, the flow field of 12,000 Reynolds number, which simulates the Martian environment, was calculated. The variation of lift coefficient with increasing angle of attack was almost consistent with the experimental value in the Earth environment, and the stall angle was 16°. From the results of pressure distribution on the wing surface, it is suggested that compared to the Earth environment, the separation point movesfrom the leading edge to aft of the wing upper surface in the Martian environment. The flow field at the stall angle was similar to that of the Earth environment, and vortices were formed, however, their velocity vectors were very small, and dead water regions were observed near the trailing edge of the wing upper surface. More detailed aerodynamic characteristics should be clarified by evaluating the results using drag and moment coefficients until the SciTech Forum 2025. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： NASA

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Fatigue strength simulation of natural porous structure

引用

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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Development of Omnidirectional Electric Wheelchair with Zabuton sensor

Development of Omnidirectional Electric Wheelchair with Zabu...

引用

2008 International Conference on control, Automation and Systems, ICCAS 2008

作者： Lida, Kenichi Yoshikawa, Hisao Mori, Taichi Hira, Toshio Department of Control Engineering Nara National College of Technology Nara Japan Advanced Mechanical Engineering Course Nara National College of Technology Nara Japan Department of Mechanical Engineering Nara National College of Technology Nara Japan

ISBN: (纸本)9788995003893

In this paper, we propose an Omnidirectional Electric Wheelchair (OEW). The proposed OEW has four omniwheels for the omnidirectional movement. Two of the omniwheels are arranged to X-axis direction and the other two are arranged to Y-axis direction. By controlling the movement of the omniwheels, the OEW can instantaneously rotate and move in all directions. Hence that, especially in the narrow spaced indoor environment, the omnidirectional nature of the OEW has an advantage over the standard wheelchair. Furthermore, the operator's posture is used as signal to the OEW. The operator's posture is measured by a "Zabuton sensor" which uses a pressure sensor to measure the pressure distribution. The effectiveness of proposed the system is reflected by the experimental results of the prototype OEW and Zabuton sensor system. © ICROS.

关键词： Pressure sensors

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Proposal of a novel peeling of nano-particle (PNP) process for localized material removal on a hard material surface by controllable magnetic fields 22

Proposal of a novel peeling of nano-particle (PNP) process f...

引用

22nd International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2022

作者： Permpatdechakul, Thitipat Khajornrungruang, Panart Suzuki, Keisuke Kutomi, Shotaro Graduate School of Computer Science and System Engineering Mechanical Information Science and Technology Course Kyushu Institute of Technology Fukuoka Japan Department of Intelligent and Control Systems Avanced Mechanical Division Kyushu Institute of Technology Fukuoka Japan School of Computer Science and System Engineering Advanced Mechanical Course Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781998999118

This article proposes a novel Peeling of Nano-Particle (PNP) process to locally remove material on a hard material surface using controllable magnetic fields. Fe3O4 particles in the size range of 50-100 nm in aqueous solution (pH value 11 adjusted by KOH) were magnetically controlled to adhere and remove from a 4H-SiC surface by two electromagnetic coils, which were sandwiched between the substrate. The particle controlling phenomenon on the surface was experimentally observed and verified by our developed apparatus applying an evanescent field. According to the results, particles could be controlled to approach and remove from the substrate surface with 12mT of magnetic field at the selective area on the substrate surface to realise the proposed PNP process. © European Society for Precision engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Magnetic fields

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Absolute longitudinal distance measurement verification of a standard polystyrene nanoparticle near a surface in water by means of multi-wavelength evanescent field 22

Absolute longitudinal distance measurement verification of a...

引用

22nd International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2022

作者： Blattler, Aran Khajornrungruang, Panart Suzuki, Keisuke Baba, Akiyoshi Goto, Daiki Graduate School of Computer Science and System Engineering Mechanical Information Science and Technology Course Kyushu Institute of Technology Fukuoka Japan Department of Intelligent and Control Systems Advanced Mechanical Division Kyushu Institute of Technology Fukuoka Japan Center of Microelectronic System Kyushu Institute of Technology Fukuoka Japan School of Computer Science and System Engineering Advanced Mechanical Course Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781998999118

In the wet semiconductor process, abrasive nanoparticles are widely used in the chemical mechanical polishing (CMP) process to polish wafer surfaces for high planarization. During polishing, nanoparticles move with a high-speed three-dimensional (3D) position in the solution. In the 3D particles's moving positions, Z is a perpendicular longitudinal distance between the surface to the nanoparticle that plays a significant role in polishing, which could not be measured by general microscopy without longitudinal scanning. To understand nanoparticle phenomena near-surface, we have proposed and developed the apparatus with real-time fastmotion tracking on optical multi-wavelength evanescent fields microscopy to measure the 3D motion of the nanoparticle in water without scanning. In euspen's 2020, we could verify the relative distance ?Z of nanoparticles in water, but the absolute distance Z is unknown yet. In this manuscript, we have therefore developed an invisible nano-step height in water to verify the absolute height Z of an individual nanoparticle. The invisible nano-step height in water is made from an optical resin with a refractive index of 1.35 that is close to a refractive index of water to avoid unnecessary light during experimental verification. The nano-step height was less than 100 nm on a glass surface, fabricated using nanoimprint lithography. Polystyrene f100 nm standard particles in water were used to verify the height Z. The results of height Z of nanoparticles could be measured less than 100 nm with the measurement uncertainty ±10 nm (2s), which is related to the interferometer result of the nano-step height. © European Society for Precision engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Nanoparticles

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Fuzzy control for omni-directional vehicle with ball wheels

IEEJ Transactions on Electronics, Information and Systems

引用

IEEJ Transactions on Electronics, Information and Systems 2009年第11期129卷 9+2019-2026页

作者： Iida, Kenichi Mori, Taichi Yasuno, Takashi Advanced Mechanical and Control Engineering Course Nara National College of Technology 22 Yata-cho Yamatokooriyama-city Nara 639-1080 Japan Institute of Technology and Science University of Tokushima 2-1 Minamijyosanjima-cyo Tbkushima-city Tokushima 770-8506 Japan

In this paper, motion control for omni-directional vehicle with ball wheels is considered. The proposed omni-directional vehicle has two ball wheels, and the actuators are arranged to X-direction and Y-direction in ball wheel. Hence, omni-directional vehicle has the ability to move in arbitrary speed and direction, and has also the ability to turn around the place. The proposed control system consists of the fixed gain feedback controllers and self tuning fuzzy controllers. To achieve improvement of responses, rules of fuzzy controller are automatically adjusted by a tuning law. To achieve improvement of mobility, the optical mouse sensor is installed on omni-directional vehicle for self-localization. The experimental results demonstrate the effectiveness of the proposed system for improvement of the movement performance of the omni-directional vehicle. © 2009 The Institute of Electrical Engineers of Japan.

关键词： Motion control

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Method of Rut Detection Using Lasers and In-Vehicle Stereo Camera

Method of Rut Detection Using Lasers and In-Vehicle Stereo C...

引用

International Conference on Intelligent Informatics and Biomedical Sciences

作者： Toshiki Kage Kousuke Matsushima Advanced Engineering School Mechanical and Electrical Systems Engineering Advanced Course National Institute of Technology Kurume College Department of Control and Information Systems Engineering National Institute of Technology Kurume College

ISBN: (纸本)9781479985630

This paper reports a new method of rut detection using lasers and in-vehicle stereo camera. In this method, we detects ruts by performing various image processings for the images included laser lines that is irradiated to the road surface. The algoristhm presented have ensures that it is to reduce the processing time and cost in comparison with convensional methods.

关键词： Rut detection Computer vision Inspection vehicle

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Optimization of Rotation-Invariant Feature Detection Method for Pedestrian Recognition

Optimization of Rotation-Invariant Feature Detection Method ...

引用

International Conference on Intelligent Informatics and Biomedical Sciences

作者： Toshiki Yahiro Kousuke Matsushima Advanced Engineering School Mechanical and Electrical Systems Engineering Advanced Course National Institute of Technology Kurume Collage Department of Control and Information Systems Engineering National Institute of Technology Kurume Collage

ISBN: (纸本)9781479985630

In the technology of advanced Safety Vehicle (ASV), it is important elements to detect pedestrians. There is a technique which used image features and a classifier for pedestrian detection. However, pedestrians have pose variations, such as a rotation. That's why we cannot always get the same features. In order to solve this problem, we can use a way which used the rotation-invariant HOG, but this method needs very high costs because it's not optimized for pedestrian detection. Therefore, we improved calculating method of the rotation-invariant HOG for pedestrian detection and compared this proposed method with the conventional method. As a result, recognition rate was turned from 53.75% to 71.7%.

关键词： Pedestrian detection ASV HOG

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Development of Omnidirectional Electric Wheelchair with Zabuton Sensor

Development of Omnidirectional Electric Wheelchair with Zabu...

引用

International Conference on control, Automation and Systems ( ICCAS)

作者： Kenichi Iida Hisao Yoshikawa Taichi Mori Toshio Hira Department of Control Engineering Nara National College of Technology Nara Japan Advanced Mechanical Engineering Course Nara National College of Technology Nara Japan Department of Mechanical Engineering Nara National College of Technology Nara Japan

In this paper, we propose an omnidirectional electric wheelchair (OEW). The proposed OEW has four omniwheels for the omnidirectional movement. Two of the omniwheels are arranged to X-axis direction and the other two are arranged to Y-axis direction. By controlling the movement of the omniwheels, the OEW can instantaneously rotate and move in all directions. Hence that, especially in the narrow spaced indoor environment, the omnidirectional nature of the OEW has an advantage over the standard wheelchair. Furthermore, the operatorpsilas posture is used as signal to the OEW. The operatorpsilas posture is measured by a ldquoZabuton sensorrdquo which uses a pressure sensor to measure the pressure distribution. The effectiveness of proposed the system is reflected by the experimental results of the prototype OEW and Zabuton sensor system.

关键词： Wheelchairs control systems Educational institutions Wheels Sensor systems mechanical engineering Pressure measurement Medical services Circuits Automatic control

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Micro-organic light-emitting devices fabricated by room-temperature curing nanoimprint lithography using diamond molds

Micro-organic light-emitting devices fabricated by room-temp...

引用

2011 MRS Fall Meeting

作者： Ishikawa, Ippei Okuno, Taisuke Kiyohara, Shuji Taguchi, Yoshio Sugiyama, Yoshinari Omata, Yukiko Kurashima, Yuichi Electric and Control System Engineering Course Faculty of Advanced Engineering Maizuru National College of Technology 234 Shiroya Maizuru Kyoto 625-8511 Japan Application and Technical Section Elionix Inc. 3-7-6 Motoyokoyama Hachioji Tokyo 192-0063 Japan Department of Mechanical System Engineering University of Yamanashi 4-3-11 Takeda Kofu Yamanashi 400-8511 Japan

ISBN: (纸本)9781605113722

Organic light-emitting devices (OLEDs) have attracted a lot of attention as a next generation display. In this study, we fabricated the micro-OLEDs by room-temperature curing nanoimprint lithography (RTC-NIL) using diamond molds. The diamond has superior durability and was used as mold material for RTC-NIL. The diamond molds have been fabricated by electron cyclotron resonance (ECR) oxygen ion shower with polysiloxane oxide mask in the electron beam (EB) lithography technology. We fabricated the diamond mold pattern with 10 μm-square dot. The diamond molds have been used to form an insulating layer in micro-OLEDs. The optimum thickness of N,N′-Diphenyl-N,N′-di(m- tolyl)benzidine (TPD) [hole transport layer], Tris(8-quinolinolato)aluminum (Alq3) [electron transport layer] and aluminum (Al) [cathode] were 40 nm, 40 nm and 200 nm, respectively. We succeeded in formation of insulating layer in micro-OLEDs and operation of micro-OLEDs with 10 μm-square-dot by RTC-NIL using diamond molds. © 2012 Materials Research Society.

关键词： Silicones

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