著者

松田 秋彦 梅田 直哉 鈴木 四郎

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.227, pp.47-55, 1997-03-25

被引用文献数

7

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Heave and pitch motions of a ship model running in following and quartering seas with zero and very low encounter frequency were measured in a seakeeping and manoeuvring basin. Considering that 2D added mass tends to infinity at zero encounter frequency, new formulae to evaluate heave and pitch motions at zero encounter frequency were presented as a limit of a solution set of a strip theory. By comparison of the experiment and some theoretical predictions, it was concluded that, when the ship meets danger for capsizing in following and quartering seas, heave and pitch motions can be approximated by simply tracing their static equilibria. The prediction as the limit of the solution set of the strip theory at zero encounter frequency shows better agreements with the experimental values than the prediction based on the Froude-Krylov assumption. Further, up to the steepness 1/10 the heave and pitch motion with very low encounter frequency can be regarded as linear with respect of wave steepness.

著者

山本 正之 西島 清一郎 石谷 清幹

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.95, pp.37-40, 1959-10-20

著者

高木 健 内藤 林

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.220, pp.111-120, 1993-09-25

被引用文献数

6

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In order to investigate the mutual relation between the above water hull form and deck wetness, experiments are carried out with three models of which above water hull forms are different. Measurements of heave motion, pitch motion and the vertical acceleration at F.P. are performed in regular head waves and the wave steepness is varied. The behavior of the free water on the deck is recorded with a video camera. Measurements of absolute bow motion, relative bow motion and deck wetness in irregular waves are also performed. Results show followings. The effect of the above water hull form on the motion and the acceleration is small. The difference on deck wetness performace is not obvios, however the behavior of free water varies with the above water hull form. The long time experiment is needed to confirm the statistical property of deck wetness in irregular waves.

著者

高川 真一 森鼻 英征 下田 廣一郎 山内 裕 神野藤 保夫 井上 和也

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.214, pp.177-185, 1990-09-25

被引用文献数

1

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The pressure hull of deep submergence research vehicle is an utmost important structure that secures the safety of crew members against the hydrostatic pressure in deep sea, and should be as compact in size and light in weight as possible in order to obtain easy operation and high maneuverability of the vehicle. In design and fabrication of the pressure hull, the application of high strength material which has reliable characteristic for practical use, of design method suitable for such material and fabrication procedure which satisfies the quality requirement of the highest degree have been encouraged. In the develoment of the 6500m deep submergence research vehicle "SHINKAI 6500", which is the latest submergence research vehicle following the 2000m deep submergence research vehicle "SHINKAI 2000" in Japan, the investigation in various fields was carried out in order to adopt titanium alloy, which has superior strength/weight ratio, for the pressure hull. The production procedure of heavy thickness and large size plate and forging material, and the fabrication procedure of the pressure hull were investigated by the fabrication of the full scale model made of titanium alloy and by material tests with specimens cut from the model. The collapse behaviour was examined by collapse tests using scale models of titanium alloy and by nonlinear behaviour analysis with FEM procedure. Finally, in order to confirm both the fabrication procedure and design method in total, the cyclic loading test and collapse test using scale model fabricated according to the procedure equivalent to that for the actual pressure hull. This paper presents the design and fabrication of the pressure hull of "SHINKAI 6500".

著者

末光 哲二 松本 憲洋

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.137-146, 1985-03-30

被引用文献数

3

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A prediction method of motion basd on a simulated calculation in the time domain is usually adopted to design and evaluate dynamic positioning capabilities of offshore structures under varying environmental conditions. In this paper, the prediction method of dynamic positioning motion using hydrodynamic forces and moments obtained from captive model tests was proposed. In addition to this, the sea tria1 of the semi-submersible drilling platform was carried out, and from the acquired data, the dynamic response characterstics of motion to the thruster output were calculated. Comparing the results of the sea trial with the predicted results by the present method, the validity of this prediction method was verified. Then, some simulated calculations concerning the dynamic positioning characteristics under combined environmental conditions of current, wind and waves were carried out. It was shown from the power spectra of motion and thruster output that the wave filtering technique was important for reducing the useless operation of thrusters.

著者

渡辺 四郎 船川 正哉 馬越 立郎 山本 茂 堀川 武

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.141, pp.25-31, 1971-09-30

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A unique technique of measuring the stress of propeller blade under service condition was developed, and applied to the stress measurement of a controllable pitch propeller of an actual ship. In this report, the measuring apparatus and methods are mainly stated, outline of which is as follws; The strain gauge wire is connected from the propeller to the steering engine room through the slip-ring on the rudder-horn. The strain gauge wires are loosened between the blade and propeller boss, and the loosened wire is covered for protection from the damage by the water flow. By this unique method, the measuring can be accomplished without extracting and boring of propeller shaft. Adhesion and coating of strain gauges were studied and it was made clear that epoxy type adhesive for strain gauge adhesion and the coating by rubber type bond are best. The flexibility of the rubber type bond is especially effective to overcome the cracks in the coating even after drying. Stress measurement is conducted under the stational sea-going condition and the crash astern test. The obtained records at these tests are shown. According to these records, the double amplitude of oscillating stress of the blades is in the same extent as the mean stress.

著者

池田 勝

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.138, pp.6-11, 1970-12-30

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As a series of studies on small harbour crafts, the data on small crafts under GT 5 tons are presented in this paper.

著者

日立造船株式会社造船基本設計部

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.125, pp.38-43, 1967-06-30

著者

池田勝船舶事務所

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.179, pp.101-106, 1980-12-30