| Item type |
会議発表論文 / Conference Paper(1) |
| 公開日 |
2017-05-01 |
| タイトル |
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|
タイトル |
Low-speed galloping for rectangular cylinders with side ratios larger than unity |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
galloping |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
vortex-induced vibration |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
rectangular cylinder |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
wind tunnel tests |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
turbulent flow |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
analytical model |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_5794 |
|
資源タイプ |
conference paper |
| 著者 |
Mannini, Claudio
Marra, Antonino M.
Massai, Tommaso
Bartoli, Gianni
|
| 著者所属（英） |
|
|
|
en |
|
|
Inter-university Research Center on Building Aerodynamics and Wind Engineering (CRIACIV) : University of Florence |
| 著者所属（英） |
|
|
|
en |
|
|
University of Florence |
| 著者所属（英） |
|
|
|
en |
|
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University of Florence |
| 著者所属（英） |
|
|
|
en |
|
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University of Florence |
| 出版者 |
|
|
出版者 |
宇宙航空研究開発機構(JAXA) |
| 出版者（英） |
|
|
出版者 |
Japan Aerospace Exploration Agency (JAXA) |
| 書誌情報 |
宇宙航空研究開発機構特別資料
en : JAXA Special Publication: Proceedings of the First International Symposium on Flutter and its Application
巻 JAXA-SP-16-008E,
p. 591-600,
発行日 2017-03-15
|
| 会議概要（会議名, 開催地, 会期, 主催者等）（英） |
|
|
内容記述タイプ |
Other |
|
内容記述 |
First International Symposium on Flutter and its Application (May 15-17, 2016. Mielparque-tokyo), Minato-ku, Tokyo, Japan |
| 抄録（英） |
|
|
内容記述タイプ |
Other |
|
内容記述 |
The aeroelastic instability starting at low reduced flow speed due to the interference between vortex-induced vibration (VIV) and transverse galloping, which may be called “low-speed galloping”, was studied in the wind tunnel in the case of an elastically-supported slender rectangular cylinder with a side ratio of 1.5 and the short side face perpendicular to the smooth flow. The tests were carried out in a wide Scruton number range, starting from low values and increasing it in small steps through eddy-current viscous dampers. This study helped understanding the dynamics of the interaction between the excitation mechanisms of VIV and galloping and clearly highlighted the transition through several regimes of interference. It was found that a high value of the mass-damping parameter is required to completely decouple the ranges of excitation due to vortex-induced vibration and galloping and for the quasi-steady theory to correctly predict the galloping critical wind speed. This conclusion is also relevant from the engineering point of view, as it means that structures and structural elements with ordinary mass-damping properties can exhibit sustained vibrations where they are not predicted by classical theories of vortex-induced vibration and galloping. The modeling of this low-speed galloping was attempt by slightly modifying the wake oscillator model proposed in 1987 by Tamura and Shimada to predict the interference of VIV and galloping in the case of a square-section cylinder. It was found that a proper choice of the coupling parameter between the wake and the mechanical oscillators allows reproducing correctly the main features of the cylinder response. Finally, low-speed galloping can be positively exploited for low-power energy-harvesting systems, in view of the low onset flow speed and the weak dependency on the Scruton number up to medium values of it. |
| 内容記述 |
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内容記述タイプ |
Other |
|
内容記述 |
形態: カラー図版あり |
| 内容記述（英） |
|
|
内容記述タイプ |
Other |
|
内容記述 |
Physical characteristics: Original contains color illustrations |
| ISSN |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
1349-113X |
| 書誌レコードID |
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|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11984031 |
| 資料番号 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
資料番号: AA1630046063 |
| レポート番号 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
レポート番号: JAXA-SP-16-008E |
AA1630046063.pdf (800.7 kB)
