著者

上田 武志 岩崎 泰典 按田 正樹 箙 一之

出版者

公益社団法人日本船舶海洋工学会

雑誌

関西造船協会論文集 (ISSN:13467727)

巻号頁・発行日

no.243, pp.1-7, 2005-03-25

---

"SEA-Arrow", developed by Kawasaki Shipbuilding Corporation, is an advanced new bow form for medium-speed ships such as LPG carriers. The bow end form of SEA-Arrow around the loaded draught is much sharper than that of conventional hull ships. With SEA-Arrow, bow waves are greatly reduced in loaded condition compared with conventional hull ships. Model tank test results show that SEA-Arrow can reduce the wave resistance to a half and the required main engine horsepower by 6-10%. On the other hand, the superiority of SEA-Arrow ships' propulsive performance in loaded condition cannot be verified in sea trial because actual ships' speed tests in sea trials are generally carried out in ballast condition except oil tankers. Therefore, the authors have analyzed, to confirm the high propulsive performance of SEA-Arrow ships, the voyage data of three SEA-Arrow ships and one conventional hull ship, which are sister ships of 59,200m3 LPG carriers. The results show that the propulsive performance of the SEA-Arrow ships is superior to that of the conventional hull ship and that its analyzed speed advantage agrees with the estimate from the model tank test results.

著者

柏木 正 杉本 健 上田 武志 山崎 啓市 東濱 清 木村 校優 山下 力蔵 伊東 章雄 溝上 宗二

出版者

公益社団法人日本船舶海洋工学会

雑誌

関西造船協会論文集 (ISSN:13467727)

巻号頁・発行日

no.241, pp.67-82, 2004-03-25

被引用文献数

4

---

A prediction and analysis system for the performance of a ship in real seas is proposed and constructed, with EUT (Enhanced Unified Theory) adopted as the main calculation method. The proposed system can compute the frequency-domain response functions of the wave-induced ship motions, the distribution of the pressure and global wave loads, the relative wave height, and etc. In addition, the added resistance, wave-induced steady lateral force and yaw moment can be predicted, including effects of the bow wave diffraction, the forward speed and 3-D interactions in a rational manner. By using these results and a wave spectrum representing real irregular seas, the short-term prediction of linear responses, the averaged added resistance, and the resultant speed loss of a ship in irregular waves can be calculated with the present system. Good performance of the system is demonstrated with some comparisons to experimental results and some applications to the speed correction in the speed trial and the prediction of the speed loss in actual voyages.