4-1-2-625 一様流中に置かれた非線形復原力特性を有する円柱構造物のロックイン現象解析(4-1-2:直交流中の流体関連振動・音響のメカニズムと計測制御,領域4:流体関連振動・ローターダイナミクス,総合テーマ「海を越え,国を越え,世代を超えて!」)

• 今岡 広一

  北海道大学大学院工学院

• 小林 幸徳

  北海道大学大学院工学研究院

• 江丸 貴紀

  北海道大学大学院工学研究院

• 星野 洋平

  北見工業大学機械工学科

書誌事項

タイトル別名

• 4-1-2-625 Analysis of lock-in phenomena of a cylinder structure having nonlinear restoring force property under uniform flow

抄録

Vortex-induced vibration of an elastically supported structure in a uniform flow is affected by many factors of the structure. Their effects on the phenomena however have not been investigated completely yet. In this paper, the vortex-induced vibration of a circular cylinder supported by cantilever beams is studied under a uniform air flow. A wire is installed to the support mechanism to add a nonlinear restoring force property. To investigate the effect of damping forces of the structure on the vortex-induced vibration, the damping force of the system is changed by the velocity feedback using electromagnets as actuators. Experiments are conducted in wide range of flow speed to investigate the nonlinear property of the vibration. Numerical simulations are also conducted using a wake oscillator model with acceleration coupling. Simulation results show the typical nonlinearity in the model, and the validity of the analytical model is discussed by comparing with the experimental results.

収録刊行物

• 機械力学・計測制御講演論文集

  機械力学・計測制御講演論文集 2013 "625-1"-"625-9", 2013-08-25

  一般社団法人日本機械学会

キーワード

• Flow Induced Vibration
• Nonlinear Vibration
• Wake
• Van der Pol Equation

詳細情報

• CRID: 1570572702920137216
• NII論文ID: 110009979942
• NII書誌ID: AA11901770
• ISSN: 13480235
• 本文言語コード: ja
• データソース種別:
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