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年-1998年）题为“高速船甲板湿度估计研究”的研究项目，主要结论如下：（1）得出了以下结论。显然，船舶周围的稳定流强烈影响船舶上的不稳定水动力。这项研究表明，稳定流势的二阶导数项非常重要。 (2)我们开发了3.D线性兰金面板法作为一种实用的估计方法来预测稳定流和非稳定流之间的相互作用效应，并且通过与实验结果的比较表明该方法是可行的。对于预测高速船舶的适航性非常有用。(3)稳定流对辐射力的影响比衍射力强，特别是在低频范围内。(4)影响。的稳定流必须不仅要考虑自由表面条件，还要考虑船体表面条件，以准确估计船舶上的压力分布。(5)艏部折角可以减小艏部绕射波的振幅，从而减小艏部绕射波的振幅。在高速船舶上，最好在船首部分安装转向节，以减少甲板湿度。(6)随着前进速度的增加，稳定流和非稳定流之间的影响变得更加显着，特别是船首周围的波浪剖面。受到船头耀斑的强烈影响因此，为了准确预测高速船舶的耐波性，有必要开发一种能够考虑静水面以上船艏外倾形状影响的新预测方法。(7)明确了这一点。高速船舶的大部分事故都与高速船舶的不稳定运动密切相关，因此迫切需要明确产生不稳定运动的水动力现象。