| Project/Area Number |
09555147
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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 | 展開研究 |
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| Research Field |
構造工学・地震工学
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| Research Institution | Nihon University |
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Principal Investigator |
NOMURA Takashi Nihon University, College of Science and Technology, Professor, 理工学部, 教授 (50126281)
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| Co-Investigator(Kenkyū-buntansha) |
FUJINO Yozo University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (20111560)
KIMURA Kichiro University of Tokyo, Graduate School of Engineering, Associate Professor, 大学院・工学系研究科, 助教授 (50242003)
KITAGAWA Tetsuya Nihon University, College of Science and Technology, Research Associate, 理工学部, 助手 (10287584)
WAKAHARA Toshihiro Shimizu Corporation, Izumi Research Institute, Senior Researcher, 和泉研究室, 主任研究員
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥11,100,000 (Direct Cost: ¥11,100,000)
Fiscal Year 1998: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1997: ¥5,900,000 (Direct Cost: ¥5,900,000)
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| Keywords | natural win / wind tunnel / AC servomotor / wind direction / velocity fluctuation / 実測 |
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| Research Abstract |
The present project has been conducted to develop a new wind tunnel system to simulate fluctuations in velocity and direction of natural wind. The system consists of two wind blowers of which directions are inclined to each other in the horizontal plain at the angle of 45 degree. The fan of each blower is driven by an AC servomotor which is operated by computer-generated voltage histories. Two wind streams from these two blowers are merged to each other in order to generate a single stream of specified direction and velocity The main results of the present work are listed below.
(1) When two steady flows are merged, the resulting wind stream is sufficiently smooth.
(2) We have established a mathematical function between the two wind velocities and the objective velocity and direction of the resulting wind stream.
(3) Using this function, we have succeeded to generate large motion of unsteady wind streams both in wind velocity and direction.
(4) Using this wind tunnel system, we have succeeded to generate wind streams which possess the velocity fluctuation in obedience with the power spectrum of natural wind, not only in the direction of the flow but also in the perpendicular direction to the flow.
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