| Project/Area Number |
03555045
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械力学・制御工学
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| Research Institution | UNIVERSITY OF TOKYO |
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Principal Investigator |
KANEKO Shigehiko UNIVERSITY OF TOKYO, FACULTY OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (70143378)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Tatsuo UNIVERSITY OF TOKYO, FACULTY OF ENGINEERING, ASSISTANT LECTURER, 工学部, 助手 (70011179)
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| Project Period (FY) |
1991 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1991: ¥5,900,000 (Direct Cost: ¥5,900,000)
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| Keywords | SELF-EXCITED VIBRATION / FLUID-ELASTIC VIBRATION / FLUTTER / LEAKAGE FLOW / ACTIVE CONTROL / VIBRATION SUPPRESSION / NUCLEAR POWER COMPONENT / MECHATRONIC DEVICES / アクティブコントロ-ル |
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| Research Abstract |
In this project, the system for evaluating the characteristics of flow-induced vibration of the following two cases of elastic structures was developed ; the first one is the case where elastic structures are moving in quiescent air flow such as antennas of satellites under ground test operations ; the second one is the case where elastic structures are vibrating subjected to one-dimensional leakage flow such as heat exchanger tubes and the load arms of electromagnetic disk files. As for the first case, the characteristics of the fluid force were found to be the function of amplitudes, frequencies, the configuration of edges of plates from the observation of the wave form of damped free vibrations of elastically supported plates. As for the second case, two types of experimental apparatus were designed and made for measuring the unstable fluid force acting on the elastically supported rigid plate and the cantilever elastic beam subjected to one-dimensional leakage flow. The unstable fluid force was measured by the following procedure ; (1) suppressing the unstable vibrations by adding additional fluid forces created by a piezo bymorph actuator installed at the inlet of the passage, (2) accounting the power input of the actuator. Finally, the validity of "the leakage flow approximation" was examined intensively both analytically and experimentally and the fact that this approximation is valid when the ratio between the channel length and the channel width is less than 10 was first found.
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