NUMERICAL INVESTIGATION OF THE MECHANISM FOR WIND-INDUCED OVALLING VIBRATIONS OF THIN CIRCULAR CYLINDRICAL STRUCTURES USING VORTEX METHOD

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  • 渦法を用いた薄肉円筒形構造物の風によるオバリング振動の発生機構に関する数値的検討
  • ウズホウ オ モチイタ ウスニク エントウケイ コウゾウブツ ノ カゼ ニ ヨル オバリング シンドウ ノ ハッセイ キコウ ニ カンスル スウチテキ ケントウ

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The mechanism for wind-induced ovalling vibrations of thin circular cylindrical structures is investigated by using a vortex method. The subject of this paper is limited to a two-dimensional structure in the subcritical regime. The aerodynamic stability of the vibrations in the 2nd to 4th modes is discussed, based on the results of a forced-vibration test. The work done by the unsteady pressures for one cycle of a harmonic motion is computed. The effect of a splitter plate on the aerodynamic stability of the structures is also discussed. The consideration on the mechanism for the ovalling vibrations is verified by the results of a free-vibration test.

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