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

高速船舶甲板湿度估算研究

• 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; 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

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

我们已经执行了三年（1996-1998）的研究项目，标题为“高速血管估计甲板淋湿性的研究”。在本研究中获得的主要结论总结如下：（1）清楚地表明，船舶周围的稳定流动强烈影响船上不稳定的流体动力。我们开发了预测它们之间相互作用的新方法。从这项研究中可以明显看出，稳定流量潜力的第二个衍生项在流体动力力上起着重要作用。（2）我们开发了3.D线性Rankine面板方法，以预测稳定和不稳定流量作为实际估计方法之间的相互作用效应。此外，从与实验结果的比较中可以清楚地表明，该方法对于预测高速血管的海务质量很有用。（3）稳定流对辐射力而不是衍射力强烈影响。特别是，它在低频中强烈地出现在它们上。（4）不仅必须考虑到稳定流动的影响不仅要考虑到自由表面状况，而且还要考虑到船体表面状况，以准确估算船上的压力分布。（5）弓形部分的衍射波的放大器可以通过弓形部分的指关节降低。因此，希望将指关节固定在弓部分处，以减少高高的甲板湿度。 （6）随着前进速度的增加，稳定流动和不稳定流量之间的影响变得更加显着。特别是，弓形部位周围的波轮廓受弓形耀斑形式的强烈影响。因此，有必要开发一种新的预测方法，该方法可以考虑到静止水面上方的弓形耀斑形式的作用，以预测高速容器的准确海务质量。（7）很明显，高速容器的大多数事故与高速船只不稳定的摩托车密切相关。因此，迫切需要清晰的流体动力现象产生不稳定的动作。较少的