東京大学大学院新領域創成科学研究科環境学研究系人間環境学専攻
Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo
Abstract
In this study, we experimentally examined the vibration response characteristics of two tandem circular cylinders of uniform diameter (d) and relatively low structural damping. Experiments were carried out with inline tandem cylinders in a water channel with two degrees-of-freedom, varying the natural frequency ratio of upstream cylinder to downstream cylinder. The cylinders were cantilever mounted with a low natural frequency in the inline and cross-flow directions (around 50Hz). The spacing between the cylinders was 4.0d. The Reynolds number of the experiments was from 3000 to 22000, varying the reduced velocities up to about 5. The oscillating frequencies of the cylinders and the surrounding flow were measured simultaneously using high temporal resolution particle image velocimetry (PIV), which is non-intrusive with respect to the flow and has high spatial and temporal resolutions. As a result, the closer the value of natural frequencies, the stronger the influence from the upstream cylinder to downstream cylinder was. Also, it was changed by the difference of structural damping.
発行年
2011-03-24
日本十進分類法
501
学位名
修士(環境学)
学位
master
研究科・専攻
新領域創成科学研究科環境学研究系人間環境学専攻
学位授与年月日
2011-03-24
学位記番号
修創域第3983号
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類似の振動特性を持つ直列2円柱構造物の流体関連振動現象に関する研究(要旨)
要旨(summary)
(1.11MB)
