Prediction of the Seakeeping of High speed Ships

高速船舶适航性预测

基本信息

批准号：
02402039
负责人：
OHKUSU Makoto
金额：
$ 6.46万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

Objective of this research is to develop a methodology to predict and evaluate seakeeping of high speed ships such as SES,SWATH and hydrofoil boats in the perspective of overcoming their vulnerability to the rough seas. The results are:1. (1) We developed a new theory to predict hydrodynamic forces and wave exciting forces on high speed ships of catamaran hull form in waves at high Froude number. This theory accounts correctly the high speed effects on the hydrodynamic forces despite light computational loads compared with other sophisticated techniques. It is straightforward with this theory to incorporate the effect of hydrofoils attached to the main hull into hydrodynamic forces. (2) Validity of the theory was confirmed by model tests in the water tank. First we found that the added mass and damping coefficients of heave and pitch predicted by the present theory are in good corelation with those obtained by forced motion test. Characteristics of waves produced by the radiation and the diffraction of high speed catamaran were measured and analyzed by new experimental technique we developed. Those characteristics are closely related to added resistance of high speed ships in waves. They were confirmed to be correlated to the theoretical. (3) We developed a theory to predict the hydrodynamic forces acting on a hydrofoil running at high speed under waves with shallow depth of submergence. This can be easily combined with the theory described in (1) and (2). 2.We completed a computer program by which we can compute and evaluate the motions and wave forces of a catamaran running in oblique or short crested waves at very fast speed. This program is a useful tool to design high speed ships with better performances in a seaway.

本研究的目的是开发一种方法来预测和评估高速船舶（如 SES、SWATH 和水翼船）的耐波性，以克服其在波涛汹涌的大海中的脆弱性。结果是： 1． (1)我们发展了一种新的理论来预测双体船体高速船舶在高弗劳德数波浪中的水动力和波浪激振力。尽管与其他复杂技术相比计算负荷较轻，但该理论正确地解释了高速对水动力的影响。利用该理论可以很简单地将附着在主船体上的水翼的效应纳入水动力中。 (2)通过水箱模型试验验证了理论的有效性。首先我们发现本理论预测的垂荡和纵摇的附加质量和阻尼系数与受迫运动试验得到的结果有很好的相关性。通过我们开发的新实验技术测量和分析了高速双体船的辐射和衍射产生的波浪特性。这些特性与高速船舶在波浪中增加的阻力密切相关。它们被证实与理论相关。 (3)我们发展了一种理论来预测作用在浅水深波浪下高速行驶的水翼上的水动力。这可以很容易地与（1）和（2）中描述的理论结合起来。 2.我们完成了一个计算机程序，通过该程序我们可以计算和评估双体船在斜波或短波峰中以非常快的速度运行的运动和波浪力。该程序是设计在海上具有更好性能的高速船舶的有用工具。