| Project/Area Number |
12650222
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Akita University |
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Principal Investigator |
DOKI Hitoshi Akita University, Department of Mechanical Engineering, Faculty of Engineering and Resource Science, Professor, 工学資源学部, 教授 (80134055)
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| Co-Investigator(Kenkyū-buntansha) |
HIRAMOTO Kazuhiko Akita University, Department of Mechanical Engineering, Faculty of Engineering and Resource Science, Associate Professor, 工学資源学部, 助教授 (00261652)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Simultaneous optimal design of structural and control systems / Cantilevered pipes conveying fluid / Active control / LQG control law / Energy for active control / Closed-loop critical flow velocity / Local random search / 構造系と制御系の同時最適設計 / LQG制御則 / 流体関連振動 / 複合送水管 / 同時最適設計 / フラッタ / SA法 |
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| Research Abstract |
We deal with a simultaneous optimal design of structural and control system of cantilevered pipes conveying fluid. We consider a combined pipe conveying fluid which is consisted of a beam (with variable shape) sandwiched by two pipes conveying fluid. The mathematical model of the combined pipe system is derived as a single pipe conveying fluid whose structural properties are variable. The width distribution of the beam and the location of the sensor and the actuator are structural design parameters. We employ the LQG control law with the input energy constraint as the active control method. The structural design parameters and the LQG controller are simultaneously adjusted so that the critical flow velocity of the controlled system (closed-loop critical flow velocity) is maximized with an iterative numerical optimization technique. The simulation result shows the necessity of the simultaneous optimal design approach in designing the active control system of the cantilevered pipe conveying fluid. The experimental study is also conducted. The experimental result fairly agrees with the simulation result and emphasizes the proposed design methodology.
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