Establishment of Prediction on Unstable Ship Motions under Extreme Sea States
极端海况下船舶不稳定运动预测的建立
基本信息
- 批准号:13555270
- 负责人:
- 金额:$ 3.71万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2001
- 资助国家:日本
- 起止时间:2001 至 2003
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
(1)Comparison of several numerical models from the world leading institutes and capsizing model experiments showed that qualitative prediction of capsizing for intact ships in following and quartering waves was possible but no numerical model could quantitatively predict capsizing.(2)They showed that the models could estimate critical wave height of capsizing of damaged ships in beam waves but none could explain roll angles before capsizing.(3)For broaching, e.g. one of the major capsizing modes of intact ships in following and quartering waves, a model to quantitatively predict capsizing due to broaching was newly developed and validated with the capsizing model experiments. The new model takes into account the wave effect on hydrodynamic derivatives with respect to ship motions and hydrodynamic forces due to large heel angles.(4)For bow-diving that could result in capsizing in following waves, a new calculation method to predict its onset was proposed and well validated with experiments.(5)For numerical modeling of damaged ships, a new theory was formulated to take the effect of progressive flooding into the hull on hydrodynamic forces acting on the hull into account and demonstrated that such effect is significant. Moreover, the difference between the numerical and physical modeling was explained as a kind of anti-rolling tank effect due to flooded compartments.(6)For a calculation method of capsizing probability based on a piece-wise linear approach, effect of wave statistics was investigated with numerical studies and then it was shown that calculated probability with operational effects could be comparable to actual casualty statistics.
(1)通过对国际上几种主要研究机构的数值模型的比较和倾覆模型试验表明,对完整船舶在随浪和四分浪中的倾覆可以进行定性预报,但还没有一种数值模型能对倾覆进行定量预报。(2)研究表明,模型可以估算横浪中破损船舶的倾覆临界波高,但不能解释船舶倾覆前的横摇角。(3)针对完整船舶在随浪和四分浪中的主要倾覆形式之一横摇,建立了横摇倾覆的定量预报模型,并通过模型试验进行了验证。新模型考虑了波浪对船舶运动的水动力导数和大横倾角引起的水动力导数的影响。(4)针对在后续波浪中可能导致倾覆的船首潜水,提出了一种新的预测其发生的计算方法,并通过实验得到了很好的验证。(5)在破损船舶的数值模拟中,建立了一种新的理论,考虑了船体的渐进浸水对作用在船体上的水动力的影响,并证明了这种影响是显著的。此外,数值模拟和物理模拟之间的差异被解释为一种减摇水舱效应,由于淹没舱室。(6)对于基于分段线性化方法的船舶倾覆概率计算方法,通过数值研究,考察了波浪统计的影响,表明考虑操作影响的计算概率与实际人员伤亡统计具有可比性。
项目成果
期刊论文数量(72)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A.Matsuda, N.Umeda, H.Hashimoto, S.Urano: "Comparison of Northern European and Japanese Purse Seiners by Capsizing Model Experiments"関西造船協会論文集. 238. 121-129 (2002)
A.Matsuda、N.Umeda、H.Hashimoto、S.Urano:“通过倾覆模型实验比较北欧和日本围网船”《关西造船协会交易》238. 121-129 (2002)。
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- 影响因子:0
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H.Hashimoto, N.Umeda, A.Matsuda: "Broaching Prediction with Nonlinear Heel-Induced Hydrodynamic Forces Taken Into Account"Proceedings of the 8^<th> International Conference on the Stability of Ships and Ocean Vehicles.
H.Hashimoto、N.Umeda、A.Matsuda:“考虑非线性跟部诱导水动力的拉削预测”第 8 届国际船舶和海洋车辆稳定性会议论文集。
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- 影响因子:0
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青木一紀, 野本謙作, 梅田直哉: "セーリングヨットの船型主要目の変遷について"関西造船研究協会論文集. 240. 181-187 (2003)
Kazunori Aoki、Kensaku Nomoto、Naoya Umeda:“论帆船主要特征的变化”关西造船研究会会议记录 240. 181-187 (2003)。
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K.Aoki, K.Nomoto, N.Umeda: "Trends in Principal Dimensions of Sailing Yacht Design"Journal of Kansai Society of Naval Architects.
K.Aoki、K.Nomoto、N.Umeda:“帆船设计主要尺寸的趋势”关西造船学会杂志。
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N.Umeda, H.Hashimoto, A.Matsuda: "Broaching prediction in the light of an enhanced mathematical model, with higher-order terms taken into account"Journal of Marine Science and Technology. 7(in press). (2003)
N.Umeda、H.Hashimoto、A.Matsuda:“根据增强的数学模型进行拉削预测,并考虑高阶项”海洋科学与技术杂志。
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