权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

FUNDAMENTAL RESEARCH ON MECHANISM OF CAPSIZING OF SHIPS IN WAVES

船舶波浪倾覆机理基础研究

基本信息

批准号：
03650371
负责人：
SHIN Chanik
金额：
$ 1.02万
依托单位：
NAGASAKI INSTITUTE OF APPLIED SCIENCE
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

In considering the safety plan of the ship, it is important to treat the motions of the inclined ship in waves. When a ship is inclined at an arbitrary angle due to the effect of strong wind or shift of cargo etc., the ship's cross section under the water line is asymmetry. Therefore the coupled effects between symmetric motions and anti-symmetric motions can not be ignored.These the effects was investigated by equation of inclined ship motions and tank test using ship model.In the experiments, it was observed that the inclined ship rolls with large angle in bow sea condition.To develop an analytical method for capsizing of the ship with bulwark, experiments for capsizing of two-dimensional bodies with the bulwark was carried out in regular transverse waves.The experimental results show that capsizing of two-dimensional bodies was caused by the quantity of shipped water on the deck and the effects of bulwark height.The dynamic swell-up due to the disturbance of orbital motion of water particles on the ship's sides in the oblique waves was investigated theoretically.Model experiments on the dynamic swell-up due to the oblique waves were carried out for a ship model with the Lewis form cross sections fixed in the oblique waves. Another model experiments on the safety of ships in the waves were carried out for that ship model and a model of fishing vessel.If deck wetting occurs repeatedly, some amount of shipping water is accumulated on deck. In this situation, stationary oscillation around heeling condition and/or capsizing of the ship occur in waves.

在考虑船舶安全方案时，必须考虑倾斜船舶在波浪中的运动。当船舶由于强风或货物移位等的影响而以任意角度倾斜时，船舶在吃水线以下的横截面是不对称的。本文通过倾斜船舶运动方程和实船模型水舱试验，研究了对称运动和反对称运动的耦合作用对船舶倾覆的影响，发现倾斜船舶在船首浪条件下会发生大角度横摇，为建立舷墙船舶倾覆的分析方法，在规则横浪中进行了带舷墙二维体的倾覆试验，试验结果表明，二维体的倾覆是甲板上的船载水量和舷墙高度共同作用的结果。对斜波中船侧水质点轨道运动扰动引起的动力浮升进行了理论研究，并对固定刘易斯形横截面的船模在斜波中的动力浮升进行了模型试验。对该船模和某渔船船模进行了波浪中船舶安全性的模型试验，若甲板反复湿化，一定量的船舶积水会积聚在甲板上。在这种情况下，船舶在波浪中发生围绕横倾状态和/或倾覆的平稳振荡。