Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Experimental Study of VIV Characteristics of Free Hanging PVC Pipe under Forced Oscillation Conditions

강제가진조건에서 자유롭게 매달린 PVC 파이프의 와류유기진동 특성에 관한 시험 연구

  • Kwon, Yong-Ju (Korea Research Institute of Ships and Ocean Engineering, KRISO) ;
  • Jung, DongHo (Korea Research Institute of Ships and Ocean Engineering, KRISO) ;
  • Park, Byeong-Won (Korea Research Institute of Ships and Ocean Engineering, KRISO) ;
  • Jung, Jae-Hwan (Korea Research Institute of Ships and Ocean Engineering, KRISO) ;
  • Oh, Seunghoon (Korea Research Institute of Ships and Ocean Engineering, KRISO)
  • 권용주 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정동호 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 박병원 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정재환 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 오승훈 (한국해양과학기술원 부설 선박해양플랜트연구소)
  • Received : 2018.09.14
  • Accepted : 2018.10.18
  • Published : 2018.10.31
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Abstract

A series of model tests was carried out to investigate the vortex-induced vibration (VIV) characteristics of a free hanging PVC pipe under forced oscillation conditions. The prescribed displacement with a period and amplitude was forced at the top of the riser. The motion of the riser along its length was measured with underwater cameras in three dimensions. The top-excited responses in the inline direction and vortex-induced vibration in the cross-flow direction were examined in the time and frequency domains. Multi-peak frequencies in the VIV were demonstrated to be strongly dependent upon the Keulegan-Carpenter number, corresponding with the results of Blevin. It was found that the Reynolds numbers (excitation period) was a critical parameter for the dominant VIV characteristics, even under the condition of using the same Keulegan-Carpenter number, under the top-excited condition. In the resonance at the nth natural frequency by the forced-motion induced VIV frequency, the riser responded with a large amplitude and forced frequency, dominantly in the VIV CF direction.

Keywords

References

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