| Project/Area Number |
11450097
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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 |
Intelligent mechanics/Mechanical systems
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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) |
SATOU Akira Yamagata University, Dept. of Mechanical Systems Engineering, Research Associate, 工学部, 助手 (40333992)
VIEIRA L.Sheila Yamagata University, Dept. of Mechanical Systems Engineering, Research Associate, 工学部, 助手 (70302304)
MATSUSHITA Koichi Yamagata University, Dept. of Electrical Engineering, Professor, 工学部, 教授 (70124625)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2000: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1999: ¥9,000,000 (Direct Cost: ¥9,000,000)
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| Keywords | Electrorheological Fluid / Micro System / Flow mode / Micro Flow Behavior / Flow Rate Control Characteristics / 3-Ports Micro Valve / Micro Actuator / Piezoelectric Micro Pump / 分散系ER流体 / 回転せん断流れ / スクイーズ流れ / マイクロ流動 / ERマイクロアクチュエータ / PWM制御 / ER圧電マイクロポンプ / フォトリソグラフィ / 各種流れモード / 3ポートERバルブ / ERマイクロポンプ / 駆動法 / マイクロERバルブ / DC電圧制御 / クラスター / フォトレジスト法 |
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| Research Abstract |
ER fluids are one of an exciting family of functional fluids, which show dramatic and reversible rheplogical changes in several milliseconds when the electric field is applied. Therefore, for example, in the ER fluid hydraulic circuit systems, it is possible to control the pressure and flow rate using an ER valve consisting of only electrodes with no moving parts. In this research, featuring the possibility of miniaturization of ER mechanical elements such as clutch, brake, damper and valve due to their construction using only electrodes, the following investigations have been done in order to develop micro systems utilizing electrorheological fluids as working oils.
(1) The flow fields frequently used in the ER micro systems are classified into three flow modes such as a pressure flow, a shear flow and a squeeze flow. For three kinds of ER fluids, the micro flow characteristic in these three flow modes with an about 0.1-0.3mm micro gap was clarified by flow visualization observation in
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close relation to each ER characteristic, and the ER fluid suitable for the ER micro system and the optimal design concept for applications were shown.
(2) As some examples of micro systems, the 3-ports micro ER valve and the micro-actuator consisting of two ER valves and a diaphragm drive part were fabricated by the photolithography method. The flow rate control characteristics for the 3-ports micro ER valve and the diaphragm response characteristics for the micro-actuator in open loop control and PID position feedback control were evaluated.
(3) A piezoelectric micro pump for ER fluids actuated by a piece of PVDF piezdelectric-film diaphragm for supplying ER fluid to the above micro-actuator was developed. A normalized method for evaluating the behaviors of a circular unimorph piezoelectric diaphragm was deduced and the diaphragm deformation for the input voltage and the pumping flow rate were analyzed, and the piezoelectric diaphragm pump of 10mm diameter was actually constructed, and the pumping performance was evaluated. Less
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