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A Study of the Effects that Change the Vibration Mode of Riser VIV

改变立管VIV振动模式的影响研究

基本信息

批准号：
21760673
负责人：
FUJIWARA Tomo
金额：
$ 2.91万
依托单位：
National Maritime Research Institute
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2009
资助国家：
日本
起止时间：
2009 至 2010
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21760673/
关键词：
海洋工学資源開発工学海洋資源 VIV(渦励振)ライザー水槽試験

项目摘要

To clarify the phenomena of dynamic variation of the riser's vibration mode, a large-scale experiment using a long model was carried out. In order to investigate an influence of the change of vibration mode on the riser VIV motion, a series of experiments were conducted with the periodic variation of top tension. VIV amplitude under dynamic tension variation is smaller than that under static condition. Additionally reduction of amplitude in case of relatively long mode-transition period is larger than that with short period. It is speculated that vibration of riser model is small because vibration mode shifted before VIV with certain mode is fully-developed.

为了弄清立管振动模态的动态变化现象，采用长模型进行了大型实验。为了研究立管振动模态的变化对立管涡激振动的影响，在顶部张力周期性变化的情况下进行了一系列实验。动态张力变化下的涡激振动幅值小于静态条件下的涡激振动幅值。此外，在较长的模式转换周期的情况下，振幅的减少比短周期的情况下更大。可以推测，立管模型的振动较小，是因为在某个模态的涡激振动充分发展之前，振动模态发生了位移。