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# 毕业设计（论文）-航行船舶在浅水中的纵倾变化研究.doc

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2011届本科毕业论文(设计)

Analysis of the navigating ships’change of trim in shallow water

0引言 1
1浅水域的概况 2
1.1浅水区界定 2
1.2浅水效应产生的原因 2
1.3浅水效应产生的现象 2
2船舶纵倾变化的影响因素 3
2.1船舶排水量及排水体积变化的影响 3
2.2船体的线型(船舶的方形系数)的影响 3
2.3舷外水密度变化的影响 4
2.4船速大小的影响 4
3船体下沉量的估计 5
3.1基于傅汝德数的船体升沉和纵倾变化 6
3.2船首下沉量的定量计算 6
4利用纵倾变化提高船舶载货量 7
4.1通过实例计算船舶可加载的载货量 7
4.2提高载货量的具体建议 8
5结束语 10

(专业:航海技术学号:074120126)

Analysis of the navigating ships’change of trim in shallow water
Zheng jianwei
( Navigation Department,Maritime College of Ningbo University
Student number:074120126
Supervisor:Hu Yunping & Zhang yuanqiang)
Abstract: The reseatch of the trim change in shallow water. of course, where is the shallow water should be defined first, and then through the analysis of the conditions, reasons and phenomenon of the shallow water effect leads to the ships’ trim change in shaollow water. For the change of the ship’s trim, we mainly congsider several of the more important factors , such as, displacement tonnage of the ship, ship’s coefficient, the change of water density outboard, ship’s speed, thus we can have a qualitative understanding of the ships’ trim. Then we use the existing theory and empirical formula to calculate the amount of quantitative changes of the ship’s sinking and trimming, and then analyze the results of the calculation to decide the amount of cargo can be loaded due to the trim change and use the example to demonstrate the results. On this basis, and with the specific suggestions, we hope to use the changes of ship’s trim in shallow water to take full advantage of the ship’s cargo capacity and then improve the efficiency of the ship and finally it can bring some efficiency gains to the panies.
Keywords: navigating ship; shollow water effect; the change of ship’s trim; Froude coefficient.
0引言
1987年,渡轮”Herald of Free Enterptis”在Zeebrugge倾覆,导致近200人死亡。相关人员对船舶及自然环境等进行了全面的调查后发现,由于船舶在浅水域中高速航行时,船体下沉导致船首首尖舱进水,淹没了汽车甲板,最终导致了船舶稳性丧失而倾覆【1】。随着航运的发展,此类事件发生的频率日渐增大。究其原因,则归咎于船舶在浅水域航行时所受的影响越来越大。

1浅水域的概况
1.1浅水区界定