강제가진조건에서 자유롭게 매달린 PVC 파이프의 와류유기진동 특성에 관한 시험 연구Experimental Study of VIV Characteristics of Free Hanging PVC Pipe under Forced Oscillation Conditions
- Other Titles
- Experimental Study of VIV Characteristics of Free Hanging PVC Pipe under Forced Oscillation Conditions
- Authors
- 권용주; 정동호; 박병원; 정재환; 오승훈
- Issue Date
- 2018
- Publisher
- 한국해양공학회
- Keywords
- VIV(Vortex-induced vibration) characteristics 와류유기진동 특성; Experimental study 시험연구; Forced oscillation 강제가진; Environmental loads 환경하중; Riser 라이저
- Citation
- 한국해양공학회지, v.32, no.5, pp 341 - 350
- Pages
- 10
- Journal Title
- 한국해양공학회지
- Volume
- 32
- Number
- 5
- Start Page
- 341
- End Page
- 350
- URI
- https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/494
- DOI
- 10.26748/KSOE.2018.6.32.5.341
- ISSN
- 1225-0767
2287-6715
- 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.
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