著者

西尾 茂 林 祐司

出版者

公益社団法人日本船舶海洋工学会

雑誌

らん : 纜 (ISSN:09160981)

巻号頁・発行日

no.58, pp.25-27, 2002-12-30

著者

Ueno Keizo NAGAMATSU Tetsuro

出版者

公益社団法人日本船舶海洋工学会

雑誌

西部造船会会報 (ISSN:0389911X)

巻号頁・発行日

no.41, pp.1-18, 1971-03-31

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There have been many investigations into the effect of restricted water on wave-making resistance. In numerical calculation of the wave-making resistance, however, ship forms were represented by source distributions obtained for the unbounded water instead of those for the restricted water. In the present study the authors consider the effect of restricted water to obtain source distributions and calculate the wave-making resistance to compare with the results derived from the source distributions in unbounded water. Numerical calculations are carried out on a ship in a canal with rectangular cross section. The ship is represented by stepped distribution of sources and sinks on the centre plane. The side walls aud the bottom of the canal are replaced by infinite series of image sources and sinks. Calculations are made on the following ship form and canal sizes. Ship form Parabolic water line and frame line L/B=L/T=10 Canal size W/L=0.25, 0.5, 0.75, 1.0, 1.5, 2.0 H/L=0.25, 0.5, 0.75, 1.0 where L=ship length, B=ship breadth, T=draft, W=canal width, H=canal depth From the results of the calculations, the following conclusions are derived. (1) The source density representing the same ship form increases with the presence of canal walls and decreases with the presence of canal bottom. (2) For practical purposes, the wave-making resistance in restricted water may be calculated by using the source distribution obtained in unbounded water. (3) When the canal is wider than 3/2・L and is deeper than 3/4・L, the efect of restricted water may be neglected in practical application.

著者

Wu Shukai Bose Neil

出版者

公益社団法人日本船舶海洋工学会

雑誌

関西造船協会誌 (ISSN:03899101)

巻号頁・発行日

no.218, pp.29-40, 1992-09-25

被引用文献数

1

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Difficulties with the calibration and operation of hot-film anemometers in water have prevented their widespread application for towing tank measurements. The potential advantages for measurements such as ship model wake surveys, in terms of their accuracy compared with pitot tubes and their low cost compared with laser-doppler anemometry, have yet to be fully exploited. To this end, a series of calibration experiments with several hot-film probes was done in a towing tank to investigate their calibration characteristics. A nominal wake survey experiment was conducted behind a model of a Newfoundland fishing vessel form by using a wedge-shaped single sensor hot-film probe. The experiment is described. Results obtained of the mean and turbulent axial velocity components within a half propeller disk are presented. The model was towed at a speed of 1.45m/s, which corresponded to a Froude number of 0.33 and full scale vessel speed of 6.4 knots. Techniques associated with use of hot-film probes for wake survey experiments are discussed. The present results indicate the feasibility and potential of hot-film anemometry as a practical, economical, and accurate tool for towing tank applications.

著者

H S.

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協会誌 (ISSN:03861597)

巻号頁・発行日

no.318, pp.38-43, 1955

著者

日立造船株式会社神奈川工場艦船設計室

出版者

公益社団法人日本船舶海洋工学会

雑誌

らん : 纜 (ISSN:09160981)

巻号頁・発行日

no.35, pp.69-71, 1997-03-30

著者

川崎重工業株式会社 神戸工場造船設計部

出版者

公益社団法人日本船舶海洋工学会

雑誌

関西造船協会誌 (ISSN:03899101)

巻号頁・発行日

no.142, pp.52-55, 1971-12-30

著者

編集委員会

出版者

公益社団法人日本船舶海洋工学会

雑誌

Techno marine : bulletin of the Society of Naval Architects of Japan : 日本造船学会誌 (ISSN:09168699)

巻号頁・発行日

no.804, pp.387-420, 1996-06-25

著者

永松 哲郎 児玉 良明 角川 明 高井 通雄 村上 恭二 石川 暁 上入佐 光 荻原 誠功 吉田 有希 鈴木 敏夫 戸田 保幸 加藤 洋治 池本 晶彦 山谷 周二 芋生 秀作 山下 和春

出版者

公益社団法人日本船舶海洋工学会

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

no.192, pp.15-28, 2002-12

参考文献数

11

被引用文献数

7 12

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This paper is the second half of the report on the study on microbubbles carried out by the SR239 project of the Shipbuilding Research Association of Japan, and describes the full-scale experiment using "SEIUN MARU", a 116m-long training ship that belongs to the Institute for Sea Training. Using numerical analysis and the experimental data obtained in the preparatory study described in the first half of the report, the net energy saving of SEIUN MARU by microbubbles at 14kts was estimated to be 2%. In the full-scale experiment, the trajectory of the generated bubbles was observed using underwater TV cameras and was found to shift more upward than predicted. The local skin friction was measured at several locations on the hull surface, and the skin friction increase as well as decrease by the bubbles was measured. The local void ratio was measured at one point on the hull surface, and the bubbles were found to travel slightly away from the hull surface. The change of the ship speed and shaft horsepower by microbubbles was measured, and the decrease or increase of engine power at constant ship speed was analyzed. In the most cases of the experiment the ship speed decreased by the bubble injection, mainly due to the increase of ship resistance and the decrease of propeller efficiency caused by the bubbles going into the working propeller. But, by carefully choosing the bubble injection location and thus avoiding the bubble entrainment into the propeller, the 3% power saving at a constant speed of 14kts was obtained. By taking into account the power needed to inject bubbles against hydrostatic pressure due to water depth at the injection point, this corresponds to the net power saving of 2%. Thus the net power saving by microbubbles was measured on a full-scale ship for the first time in the world.

著者

高橋 芳明

出版者

公益社団法人日本船舶海洋工学会

雑誌

らん : 纜 (ISSN:09160981)

巻号頁・発行日

no.61, pp.66-67, 2003-09-30

著者

南波 松太郎 小佐田 哲男

出版者

公益社団法人日本船舶海洋工学会

雑誌

関西造船協会誌 (ISSN:03899101)

巻号頁・発行日

no.102, pp.1-10, 1961-06-30

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"Cement carriers" or "cement tankers" are bulk cargo ships which carry cement in bulk. They have become to be noticed in our country after the War, and now are being built one by one, and are serving for almost all of the long way transportation of cement. These ships have some problems awaiting solution caused by the peculiarity of cement and cement industry. In this paper we discuss these problems, and will consider of the fundamental design of these ships. At the next opportunity we will refer to their practical construction and the self-unloading apparatus.

著者

野原 勉 松浦 正巳

出版者

公益社団法人日本船舶海洋工学会

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

no.183, pp.115-121, 1998-06

参考文献数

9

被引用文献数

1 1

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This paper describes the generation of the irregular wave specified by the spectrum of the wave envelope using a wave maker in a test basin. An effective generation algorithm for the irregular wave specified by the wave envelope spectrum is proposed. The design for mooring systems of a vessel in a port as well as a floating offshore structure is important because the long period wave happens to cause the break of mooring lines in spite of relatively calm ocean conditions. In very large floating structures, such as the mega-float case, especially, this problem will become a severe one due to no past experience in real design. The long period wave can be induced by the irregular wave specified by the spectrum of the wave envelope. The proposed algorithm is verified by the computer simulation. The experiment results using a pontoon model are also presented.

著者

川瀕 晃

出版者

公益社団法人日本船舶海洋工学会

雑誌

Techno marine : bulletin of the Society of Naval Architects of Japan : 日本造船学会誌 (ISSN:09168699)

巻号頁・発行日

no.880, 2004-07-10

著者

和爾 俊樹

出版者

公益社団法人日本船舶海洋工学会

雑誌

日本造船学会誌 (ISSN:03861597)

巻号頁・発行日

no.749, pp.696-698, 1991-11-25

著者

門井 弘行

出版者

公益社団法人日本船舶海洋工学会

雑誌

日本造船学会誌 (ISSN:03861597)

巻号頁・発行日

no.613, 1980-07-25

著者

高橋 雄 有永 真司 石井 哲郎

出版者

公益社団法人日本船舶海洋工学会

雑誌

西部造船会会報 (ISSN:0389911X)

巻号頁・発行日

no.72, pp.213-226, 1986-08-25

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As a high-speed passenger ship, a new concept "Hi-Stable Cabin Craft" is introduced and its technical feasibility was investigated. The "Hi-Stable Cabin" implies highly motion-stabilized cabin, which is mechanically supported by the main ship hull by means of a hydraulic supporting system, with which ship's vertical motion is automatically controlled so as to be suppressed into zero. Therefore, acceleration in the cabin is well minimized so that the passengers will enjoy a trip even in a rough seaway. Computer simulation was carried out regarding the motion control of the Hi-Stable Cabin Craft in waves, and it was confirmed that high degree of stabilization was possible. Model experiment was carried out by use of 3.8 meter-long ship model of the Hi-Stable Cabin Craft equiped with a electroservo mechasism supporting system. Measured pitching motion of the cabin was less than 1/8 of that of the main hull, and remarkable reduction of motion of the cabin was attained. Technical feasibility in practical design of the Hi-Stable Cabin Craft was studied from various aspect such as, general arrangement, hydraulic system, cabin structure, stability, economy of operation, etc. compared with a conventional high-speed craft. As a result, it was considered that the Hi-Stable Cabin Craft appeared to be one of the promissing concept of the advanced marine vehicle for the future.

著者

S.A.

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協会雑纂 (ISSN:03861597)

巻号頁・発行日

no.215, pp.83-92, 1940-02-15

著者

編集委員会

出版者

公益社団法人日本船舶海洋工学会

雑誌

Techno marine : bulletin of the Society of Naval Architects of Japan : 日本造船学会誌 (ISSN:09168699)

巻号頁・発行日

no.868, pp.385-419, 2002-01-10

著者

大塚 耕司

出版者

公益社団法人日本船舶海洋工学会

雑誌

らん : 纜 (ISSN:09160981)

巻号頁・発行日

no.30, pp.21-28, 1995-12-30

著者

塙 友雄

出版者

公益社団法人日本船舶海洋工学会

雑誌

関西造船協会誌 (ISSN:03899101)

巻号頁・発行日

no.205, pp.59-69, 1987-06-30

著者

三井造船株式会社玉野造船工場造船設計部

出版者

公益社団法人日本船舶海洋工学会

雑誌

関西造船協会誌 (ISSN:03899101)

巻号頁・発行日

no.196, pp.177-178, 1985-03-30