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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
권용주정동호박병원정재환오승훈
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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