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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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Heat Transfer Efficiency Evaluation for Outward and Inward Multi-Flame-Hole Gas Burner

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Journal of Thermal Science 2012年第2期21卷 189-195页

作者： Shin-ichi MORITA Yasutaka HAYAMIZU Takashi KATAYAMA Hideo INABA Department of Mechanical Engineering Yonago National College of Technology 4448 Hikona-cho Yonago city Tottori 683-8502 Japan Department of System Production Engineering Yonago National College of Technology Advanced Course 4448 Hikona-cho Yonago city Tottori 683-8502 Japan Tsuyama National College of Technology 624-1 Numa Tsuyama city Okayama 708-8509 Japan

The purpose of this study is to understand the factor that influence the heating efficiency of the outward and inward multi-hole gas burner. The flame-hole angle and the distance from flame hole to heating object are chosen as the experimental parameters. The measurement of the flame temperature distribution is carried out on each experimental condition. The observation of combustion flame, by the Schlieren method, is done from the purpose to understand the combustion phenomenon on the heating efficiency. LPG (Liquefied petroleum gas) is used for the test fuel gas. The compositions of LPG are propane 97.5vol%, butane 0.2vol% and methane + ethylene 2.3vol%. The optimum ranges of the flame-hole angle and the distance from flame hole to heating object are clarified. The experimental correlation equations for the outward and inward multi-flame-hole gas burner are proposed.

关键词： Burner Heat Transfer Design Thermal Efficiency Energy Saving

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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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Development of Omnidirectional Electric Wheelchair with Zabuton sensor

Development of Omnidirectional Electric Wheelchair with Zabu...

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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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Vibration absorption of parallel-coupled nonlinear energy sink under shock and harmonic excitations

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Applied Mathematics and Mechanics(English Edition) 2021年第8期42卷 1135-1154页

作者： Jian’en CHEN Wei ZHANG Jun LIU Wenhua HU Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures College of Mechanical EngineeringBeijing University of TechnologyBeijing 100124China

Nonlinear energy sink(NES)can passively absorb broadband energy from primary *** multiple NESs connected in parallel exhibit superior performance to single-degree-of-freedom(SDOF)*** this work,a linear coupling spring is installed between two parallel NESs so as to expand the application scope of such vibration *** vibration absorption of the parallel and parallel-coupled NESs and the system response induced by the coupling spring are *** results show that the responses of the system exhibit a significant difference when the heavier cubic oscillators in the NESs have lower stiffness and the lighter cubic oscillators have higher ***,the efficiency of the parallel-coupled NES is higher for medium shocks but lower for small and large shocks than that of the parallel *** parallel-coupled NES also shows superior performance for medium harmonic excitations until higher response branches are *** performance of the parallel-coupled NES and the SDOF NES is *** is found that,regardless of the chosen SDOF NES parameters,the performance of the parallel-coupled NES is similar or superior to that of the SDOF NES in the entire force range.

关键词： coupling influence nonlinear energy sink(NES) vibration absorption

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Pneumatic rubber actuators for a rehabilitation device to prevent contractures of finger joints

Pneumatic rubber actuators for a rehabilitation device to pr...

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International Conference on Mechatronics and Machine Vision in Practice

作者： Hironari Taniguchi Hidenori Toyooka Tetsuya Minatohara Makoto Fukuda Feifei Zhao Department of Electronics and Control Engineering Tsuyama National College of Technology Tsuyama-city OKAYAMA 708-8509 JAPAN Advanced Mechanical and Control System Engineering Course Tsuyama National College of Technology Tsuyama-city OKAYAMA 708-8509 JAPAN

ISBN: (纸本)9781467316439

There has been increased interest in use of pneumatic actuators in many fields, such as medical care and welfare. In particular, a pneumatic rubber actuator with soft material has many advantages such as low mass, flexibility, safety and user-friendliness. We therefore focus on pneumatic rubber actuators as a drive source of a rehabilitation device. This paper presents pneumatic rubber actuators for a rehabilitation device to prevent contractures of the finger joints. We propose two types of actuators. The fabrication of the actuators was based on molding silicon rubber. The actuators can not only operate in flexion and extension but can also twist and stretch out the finger. The actuators force and motion were characterized at different supply pressures. In addition, we investigated different possible methods of rehabilitation for fingers using the actuators. The metacarpophalangeal (MP) and the proximal interphalangeal (PIP) joint motion -were measured with the supply pressure of 150 kPa. The range of MP/PIP joint motion was from minus 3/9 degrees to 53/55 degrees. It was shown about 40 percent of its normal range. As a result, we confirmed the viability of the actuators for a finger rehabilitation device.

关键词： Pneumatic actuator rehabilitation device preventing contractures. actuators Pneumatic actuators Contracture supply pressures Pneumatic Finger Joint Rehabilitation rubbers Lake Restoration Fingers

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Human Assistive Rehabilitation system for Lower-limb using Exoskeleton

Human Assistive Rehabilitation System for Lower-limb using E...

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2023 International Conference on Consumer Electronics - Taiwan, ICCE-Taiwan 2023

作者： Kawai, Yasunori Miyazaki, Takato Miyoshi, Takanori National Institute of Technology Ishikawa College Department of Electrical Engineering Ishikawa Japan National Institute of Technology Ishikawa College Advanced Engineering Course Electronic and Mechanical Engineering Course Ishikawa Japan Nagaoka University of Technology Department of System Safety Niigata Japan

ISBN: (纸本)9798350324174

This paper considers a human assistive system of the rehabilitation for lower-limb using the exoskeleton. When the patient feels the fatigue in the rehabilitation, the power assist is needed to continue and to stop safety. First, the proposed power assist equipment using exoskeleton is indicated. The DC motor, the torsion spring, worm wheel, worm gear are used. Next, the control system using PI controller is proposed. The encoder attached to the knee joint is used as the reference value and the encoder attached to the motor is controlled by the motor. Finally, an experiment of repeated flexion and extension of the knee joint is conducted. It is verified that the motor can be controlled to be same angle of the knee angle. Therefore, the power assist by the exoskeleton is useful for the rehabilitation. © 2023 IEEE.

关键词： DC motors

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Design of a highly safe model vehicle for rear-end collision avoidance considering multiple faults of sensors

Design of a highly safe model vehicle for rear-end collision...

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CSSim 2009 - 1st International Conference on Computational Intelligence, Modelling, and Simulation

作者： Kasuga, Takeshi Yakubo, Satoshi Department of Electrical Engineering Fukushima National College of Technology Iwaki 970-8034 Japan Advanced Course in Mechanical and Electrical System Engineering Fukushima National College of Technology Iwaki 970-8034 Japan

ISBN: (纸本)9780769537955

This paper presents design of a highly safe driving control system using different kinds of sensors and its evaluation in order to avoid the rear-end collision of the model vehicle. An appropriate combination of different kinds of sensors is introduced to reduce the occurrence of multiple faults. It is shown in the computer solution that the reliability of the combination of different kinds of sensors is higher than that of the combination of the same kind of sensors. Moreover, the systematic design of the model vehicle is proposed, and it is also shown in the experiment that the rear-end collision avoidance can be achieved even if a fault occurs at any sensor. © 2009 IEEE.

关键词： Vehicles

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Highly safe driving control system for model vehicles using different kinds of sensors and one-way wheels

Highly safe driving control system for model vehicles using ...

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2009 9th International Symposium on Communications and Information technology, ISCIT 2009

ISBN: (纸本)9781424445219

This paper presents a highly safe driving control technique using different kinds of sensors and one-way wheels to avoid the rear-end collision and sudden stop of the model vehicle. The basic concept is "sensor diversity" which enables fault tolerant operations. An appropriate combination of different kinds of sensors is introduced to reduce the occurrence of multiple faults. The systematic design of the model vehicle is presented, and the rear-end collision avoidance can be achieved even if a fault occurs at any sensor. Moreover, if the wheel races even if a fault occurs at any motor and then the rotation of the axle stops, a safe driving can be maintained. The important design concept is that a fault makes linearly additive effect with a small value to the final result. In order to meet the requirement, we introduce one-way wheels instead of usual wheels. It is shown in the experiment of driving control of the model vehicle that rear-end collision can be avoided and then safety operations can be achieved. ©2009 IEEE.

关键词： Signal processing

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Single-gait crawling robot:A solution for improving mobility and payload of soft locomotor via simple structure and easy control

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Science China(Technological Sciences) 2024年第11期67卷 3626-3628页

作者： MA Hao HAO TianZe MA JiChao SUN ZhenHao LI Xiang LIU YiBo XIAO HuaPing LIU ShuHai College of Mechanical and Transportation Engineering China University of Petroleum-BeijingBeijing 102249China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education(Tianjin University of Technology) Tianjin 300384China

Motion performance,including movement speed,adaptability to various environments,and load-carrying capability,is crucial for soft crawling robots,tasked with field exploration and the transporting material in often complex and unstructured environments.A wide variety of soft crawling robots,which are driven by electricity[1],chemical power[2],and pressurized fluid[3]to move forward via cyclic deformation,have thus far been inspired by the mobile patterns of soft-bodied animals,such as worms[4],snake[5],octopus[6],*** performance of soft robots in terms of speed and load has developed impressively in recent years.

关键词： robot payload environments

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