| Project/Area Number |
15310099
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Microdevices/Nanodevices
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| Research Institution | Yamagata University |
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Principal Investigator |
NAKANO Masami Yamagata University, Dept.of Mechanical Systems Engineering, Professor, 工学部, 教授 (40147947)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUSHITA Koichi Yamagata University, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (70124625)
SATOU Akira Yamagata University, Dept.of Mechanical Systems Engineering, Research Associate, 工学部, 助手 (40333992)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥16,000,000 (Direct Cost: ¥16,000,000)
Fiscal Year 2005: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2004: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2003: ¥13,600,000 (Direct Cost: ¥13,600,000)
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| Keywords | Electro-Rheological Fluid / Rotational Shear Flow / Oscillatory Squeeze Flow / Pressure Flow / Micro-Gap Flow / ER Valve / Micro-Actuator / Braille display system / せん断流れモード / マイクロギャップ流れ / ナノ粒子ER流体 / 流動パターン / 押上力 / スクイーズ流れモード / 圧力流れモード / マイクロ流動特性 / ER効果 / ON-OFF制御 |
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| Research Abstract |
ER fluids are one of an exciting family of functional fluids, which show dramatic and reversible rheological changes in several milliseconds when the electric field is applied. In this research, featuring the possibility of miniaturization of ER mechanical elements such as brake, damper and valve due to their construction using only electrodes, the following investigations have been done in order to develop Braille display system utilizing electrorheological fluids as one of haptic display systems.
(1) As the fundamental flow fields in designing ER fluid micro system, three flow configurations of a pressure flow, a rotational shear flow and a oscillatory squeeze flow were focused on in this research. For two kinds of micro-particle ER fluids and one kind of nano-particle ER fluid, the micro flow behaviors in the above three flow configurations with an about 0.05-0.3mm micro gap was clarified by flow visualization in close relation to each ER characteristic, and the ER fluid suitable for
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the micro gap flow system and the optimal design concept for applications were shown.
(2) The 3-ports micro ER valve, and the diaphragm micro-actuator consisting of two ER valves utilizing a micro-particle ER fluid were fabricated by the photolithography method. The flow rate control characteristics for the 3-ports micro ER valve and the diaphragm response characteristics of the micro-actuator under PID position feedback control were investigated, and the possibility for the ER diaphragm micro-actuator to apply to the Braille display system was evaluated.
(3) An ER micro-actuator with a micro-bellows, which performed enough stroke and push-up force for one pin of the Braille display system, was fabricated by the photolithography method and the actuating performances were evaluated experimentally. It was found that ER fluid supply pressure of more than 550 kPa was needed for the developed micro actuator to perform a stroke of 0.5 mm and a push-up force of 0.15 N of the Braille pin. The Braille pin mounted to the top of the micro-bellows of the actuator was driven by applying an on-off control strategy to two ER valves of the actuator. Less
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