Study on motions of a sailing boat

帆船运动的研究

基本信息

批准号：
04452215
负责人：
KINOSHITA Takeshi
金额：
$ 1.6万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452215/
关键词：
Sailing Boat Yacht VPP Tacking Sail

项目摘要

Research works on sailing boats have a long history, but they are only empirical based on experiences of good sailors and designers. One of the exception is research for America's cup. Even that research is just on steady sailing performance. This research is on unsteady performance such as tacking and pitching, which are crucial for yacht races and ocean cruise. The following results are obtained.1.We developed the tacking simulator based on a mathematical model of four degrees of freedom of motion considering hydrodynamic forces acting on the heeled asymmetrical hull.2.We developed the identification method of the main unsteady hydrodynamic force coefficients of the mathematical model utilizing the recorded motion of the boat tested in real sea.3.We developed the measuring system of the boat motion tested in real sea, and measured it in good accuracy.4.The direction of the wind fun of the basin with wave, wind and current was rearranged in order to carry out free running tests of a radio controled sailing boat model. Speed reduction of the boat due to incident waves was measured. The mechanism of the speed reduction was investigated.5.Forced pitching tests of the sail were carried out in the wind tunnel. Added masses, damping coefficients and lift reduction were measured, and compared with newly developed strip theory based on 2-D oscillating wing theory.Furthermore FRP sandwich structures were analyzed by FEM in order to obtain light, rigid and strong hulls. Partial structures were made to confirm the applicability of the theory as well as to obtain practical production know-how.

关于帆船的研究工作有着悠久的历史，但它们只是基于优秀水手和设计师经验的经验。例外之一是美洲杯帆船赛的研究。即使这项研究也只是针对稳定的航行性能。这项研究针对的是非稳态性能，例如抢风和俯仰，这对于游艇比赛和远洋巡航至关重要。主要研究成果如下：1.开发了基于四自由度数学模型的迎航模拟器，考虑了非对称船体的水动力作用。2.开发了非定常船体主要非定常水动力系数的辨识方法。利用记录的实海试验船运动建立了数学模型。3.开发了实海试验船运动测量系统，测量精度良好。4.确定了流域的风向。波浪、风和水流是重新安排以进行无线电控制帆船模型的自由运行测试。测量了由于入射波浪而导致的船速降低。对其减速机理进行了研究。5.在风洞中进行了帆的强制纵摇试验。测量了增加的质量、阻尼系数和升力减少，并与基于二维振荡翼理论的新开发的条带理论进行了比较。此外，还对FRP夹层结构进行了有限元分析，以获得轻质、刚性和坚固的船体。制作了部分结构以证实该理论的适用性并获得实际的生产知识。