| Project/Area Number |
21760673
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Naval and maritime engineering
|
|---|
| Research Institution | National Maritime Research Institute |
|---|
Principal Investigator |
FUJIWARA Tomo National Maritime Research Institute, 海洋開発系, 研究員 (70511591)
|
|---|
| Project Period (FY) |
2009 – 2010
|
| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2009: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
|
|---|
| Keywords | 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 |
|---|
| Research Abstract |
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.
|
