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RISS 인기검색어
- 검색키워드
- 저자 : 정희운(HuiUn Jeong) (검색결과 2 건)
- 무료
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슬로싱의 영향이 포함된 사각형 부유체의 1자유도 및 2자유도 운동에 대한 실험적 연구
김윤호(YunHo Kim),성홍근(Hong G. Sung),조석규(SeokKyu Cho),정희운(HuiUn Jeong),최항순(Hang S. Choi) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.5
This study is constructed to investigate the sloshing effect on the motions of a two-dimensional rectangular floater experimentally. There are two main categories. First, only roll motion is permitted and the other motions are firmly resticted. Secon,d sway and roll motions are are just allowed simultaneously with heave motion prevented. Sway motion is occurred along the flurre"s upper rail, while roll motion is performed at the center bearing of the model. Experiments are performed in the 2D flume at Seoul Nat"l University. The filling ratios are changed from empty to 50% and for the second experimental case, the ballast conditions are varied to quantify the rail friction effect. All tests are carried out under regular wave conditions. The motions measured by a non-contact camera, which can trace two different marks on the model accurately. The steady-state sway and roll motions are filtered out by post-processing. The spring system is installed to prevent the model drift off. For the first case, it is found that as the filling ratio is increased, the roll natural frequency becomes lower. And the sloshing effect is doserved at the vicinity of roll natural frequency and sloshing natural one, but the amount is not that much significant as the sway motion. For the second case, sway motion is dominant and roll motion is almost diminished except for cases near the sloshing natural frequency. Between 4.0~7.0rad/s, which is the interval between roll natural frequency and sloshing natural one, it is found that coupling of two motions leads the roll motion"s phese shift and finally internal fluid tank acts as ART(Anti-Rolling Tank) precisely.
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슬로싱의 영향이 포함된 사각형 부유체의 1자유도 및 2자유도 운동에 대한 실험적 연구
김윤호(YunHo Kim),성홍근(Hong G. Sung),조석규(SeokKyu Cho),정희운(HuiUn Jeong),최항순(Hang S. Choi) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
This study is constructed to investigate the sloshing effect on the motions of a two-dimensional rectangular floater experimentally. There are two main categories. First, only roll motion is permitted and the other motions are firmly restricted. Second, sway and roll motions are are just allowed simultaneously with heave motion prevented. Sway motion is occurred along the flume's upper rail, while roll motion is performed at the center bearing of the model. Experiments are performed in the 2D flume at Seoul Nat'l University. The filling ratios are changed from empty to 50% and for the second experimental case, the ballast conditions are varied to quantify the rail friction effect. All tests are carried out under regular wave conditions. The motions measured by a non-contact camera, which can trace two different marks on the model accurately. The steady-state sway and roll motions are filtered out by post-processing. The spring system is installed to prevent th model drift off. For the first case, it is found that as the filling ratio is increased, the roll natural frequency becomes lower. And the sloshing effect is observed at the vicinity of roll natural frequency and sloshing natural one, but the amount is not that much significant as the sway motion. For the second case, sway motion is dominant and roll motion is almost diminished except for cases near the sloshing natural frequency. Between 4.0~7.0rad/s, which is the interval between roll natural frequency and sloshing natural one, it is found that coupling of two motions leads the roll motion's phase shift and finally internal fluid tank acts as ART(Anti-Rolling Tank) precisely.
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