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Study on Estimation of Deck-Wetness for a High-Speed Vessel

高速船舶甲板湿度估算研究

基本信息

批准号：
08405065
负责人：
TAKAKI Mikio
金额：
$ 17.79万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08405065/
关键词：
3-D rankine panel method Collocation method Steady wave profile at bow Knuckle line Bow flare form forward speed effect Interaction effect Unstable motion 定常流場と非定常流場との干渉海難事故解析安全性向上干渉影響上下揺付加質量非定常流体力速度流場法 B-spline ロバストな

项目摘要

We have performed the Research Project titled "Study on Estimation of Deck-Wetness for a High-Speed Vessel" for three years (1996 - 1998). The main conclusions obtained in this study are summarized as follows :(1)It was made clear that steady flow around a ship strongly affects unsteady hydrodynamic forces on a ship. We developed the new method predicting the interaction effect between them. It was made clear from this study that the second derivative term of steady flow potential plays important role on hydrodynamic forces.(2)We developed 3.D linear rankine panel method to predict the interaction effect between the steady and unsteady flow as a practical estimation method. Furthermore, it was made clear from the comparison with experimental results that this method was useful for predicting the seakeeping qualities of a high-speed vessel.(3)The steady flow strongly affects on radiation forces rather than diffraction forces. In particular, it strongly appears on them in the low frequen … More cy range.(4)The influence of steady flow has to be taken into account not only the free surface condition but also the ship hull surface condition to estimate accurately the pressure distribution on a ship.(5)The amplitudes of diffraction waves at bow part can be reduced by the knuckle at bow part. Thereby it is desirable to attach the knuckle at bow part to decrease the deck wetness on a high. speed vessel.(6)The influence between steady flow and unsteady flow becomes more remarkable as the forward speed increases. In particular, wave profile around bow part is strongly affected by the bow flare form. Thereby, It is necessary to develop a new predicting method which can take into account the effect of bow flare form above the still water surface in order to predict accurately seakeeping qualities of a high-speed vessel.(7)It was made clear that most of accidents for high-speed vessels are strongly related to unstable motions of high-speed vessels. Thereby, it is urgent to make clear hydrodynamic phenomena generating the unstable motions. Less

我们进行了三年（1996 - 1998年）的研究项目，题为“高速船甲板湿度估计的研究”。本文的主要结论如下：（1）研究表明，定常绕流对船舶所受的非定常水动力有着重要的影响。我们发展了预测它们之间相互作用的新方法。研究表明，定常流势的二阶导数项对水动力起着重要作用。(2)We发展了三维线性朗肯面元法来预测定常流与非定常流之间的相互作用，作为一种实用的估算方法。与试验结果的比较表明，该方法对高速船的耐波性预报是有效的。（3）定常流对辐射力的影响较大，而对绕射力的影响较小。特别是，它强烈地出现在他们的低频， ...更多信息赛岭（4）定常流的影响不仅要考虑自由表面条件，而且要考虑船体船体表面条件，才能准确地估计船体上的压力分布。（5）艏部折角可以减小艏部绕射波的振幅。因此，希望在船首部分连接转向节，以减少高处的甲板湿度。快艇（6）随着前进速度的增加，定常流与非定常流的相互影响更加显著。特别是，船首部分附近的波型强烈地受船首喇叭形的影响。因此，为了准确预报高速船的耐波性，有必要发展一种新的预报方法，该方法能考虑静水面以上船首外展形状的影响。(7)It明确了高速船舶的事故大多与高速船舶的不稳定运动密切相关。因此，迫切需要弄清引起不稳定运动的水动力现象。少