Development of Flexible Sail to Improve Thrust Performance by Using Oscillation of Sailing Vessel

利用帆船振动提高推力性能的柔性帆的研制

• 批准号: 09651018
• 负责人: MASUYAMA Yutaka
• 金额: $ 1.79万
• 依托单位: Kanazawa Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09651018/
• 关键词: Sailing Vessel; Sailing Yacht; Fluid Dynamic Force on Sail; Lifting Surface Theory; Boat Oscillation; Sail Dynamometer; Full Scale Boat Test; Numerical Simulation

This research aims to investigate an increasing mechanism of sail thrust using distortion of the flexible sail caused by oscillation of a sailing vessel such as pitching or rolling. First, numerical calculations were performed to estimate the variation of sail forces by pitching or rolling motion. The vortex lattice method was adopted as the numerical calculation method, where shedding vortex filaments proceeded downstream in each time. The calculated results showed that the pitching motion and in particular rolling motion improved thrust of sail. On the other hand, sail forces under various kinds of boat motion were measured in a full-scale sailing boat with the use of a sail force dynamometer, which consisted of an aluminum frame fixed to the hull by way of several load cells. The calculated results were compared with the measured and the accuracy of calculation method was confirmed.Then, a sail distortion system was constructed to generate almost same distorted shape due to the boat oscillation. This system consisted of two electric actuators, which were set on the platform of the dynamometer frame. The actuators fed in and out the sail control sheets or mast-bend control wires, and distorted the sail shape continuously in particular twist angle. This system showed that the variation range of sail force caused by the continuous distortion was larger than the case of static change.From this research, it can be considered that the investigate system of an increasing mechanism of sail thrust due to the boat oscillation has been established. The numerical calculations for the continuous distortion of the sail are still continuing, and the calculated results have been compared with the measured.From these results, the required characteristics for the flexible sail to improve thrust performance will become clear in detail.

本研究的目的是探讨利用帆船的纵摇或横摇等振动引起的柔性帆的变形来增加帆推力的机理。首先，进行数值计算以估计由俯仰或横摇运动引起的帆力的变化。数值计算采用涡格法，每次脱落的涡丝都向下游移动。计算结果表明，帆的俯仰运动，特别是横摇运动，增加了帆的推力。另一方面，在全尺寸帆船中使用帆力测力计测量各种船舶运动下的帆力，帆力测力计由通过几个测压元件固定到船体的铝框架组成。将计算结果与实测结果进行了比较，验证了计算方法的准确性。然后，构建了一个风帆变形系统，使风帆在船体振动的作用下产生几乎相同的变形。该系统由两个电动执行机构组成，它们安装在测功机机架的平台上。作动器通过控制帆片或桅杆弯曲控制索的进出，使帆在特定的扭转角下连续变形。该系统的研究结果表明，连续变形引起的帆力变化幅度大于静态变化的情况，可以认为建立了一个由船体振动引起的帆推力增大机理的研究系统。对帆的连续变形进行了数值计算，并将计算结果与实测结果进行了比较，从而明确了柔性帆提高推力性能所需的特性。

项目成果

荻原宗彦: "帆走性能に与えるセール面積変化の影響" 金沢工業大学大学院工学研究科修士論文. 1-55 (1999)

荻原宗彦：“风帆面积变化对航行性能的影响”，金泽工业大学工学研究生院硕士论文，1-55（1999）。

Ito, Taisuke: ""Performance Analysis of Ocean Sailing Yacht and Maneuvering Simulation" (in Japanese)" 27th Meeting for Graduate Research of Student of JSME. 145-146 (1998)

伊藤泰辅：“远洋帆船性能分析与操纵仿真”（日语）第27次JSME研究生研究会。

Hasegawa, Takashi: ""Analysis of Sail Force variation due to Motion of Sailing Boat" (in Japanese)" M.Eng.Thesis, Kanazawa Institute of Technology. (1999)

长谷川隆：““帆船运动引起的风帆力变化分析”（日语）”金泽工业大学工程硕士论文。

増山豊: "セール流体力に関する実船試験と数値計算(第1報)" 日本造船学会論文集. 181号. 1-13 (1997)

Yutaka Masuyama：“有关航行流体力的实际船舶试验和数值计算（第 1 次报告）”日本造船学会汇刊第 181. 1-13 号（1997 年）。

Yutaka Masuyama: "Full Scale Measurement of Sail Force and the Validation of Numerical Calculation Method" The Thirteenth Chesapeaks Sailing Yacht Symposium(SNAME). 13号. 23-36 (1997)

Yutaka Masuyama：“帆力的全尺寸测量和数值计算方法的验证”第十三届切萨皮克帆船研讨会（SNAME）第 13. 23-36 号（1997）。