著者

山北 和之

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1985, no.157, pp.119-125, 1985 (Released:2010-05-07)

参考文献数

3

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This report presents the longitudinal dynamics of underwater towed body system.Firstly, the longitudinal equations of motion of underwater towed body system were derived by treating the cable as lumped parameter system of discrete masses.Secondary, hydrodynamic characteristics of the hypothetical towed body, which is necessary for the analysis, were obtained experimentally. Utilizing above results, the longitudinal equations of motion of underwater towed body system under external disturbances were solved numerically.As the result, dynamic characteristics of underwater towed body system, mainly towed body response to the heaving towing point, were made clear.

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

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

---

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

白石 隆義

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.125, pp.437-445, 1969-06

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Japanese National Reilways has developed a new type berth fender for railway ferry berth, The fender is mainly composed of a box shaped steel slab whose front surface is smooth, and several water pressure shock absorbers which are made or rubber bags and attached to the back surface of the slab. The shock absorbing and damping properties of the absorber were proved excellent by half scale model tests. The results of the tests were compared with the results of approximate calculation.A trially constructed fender of this type (size=8 m×4 m) was fitted on a railway ferry berth in Uno port. Full size shock tests were carried out on this fender, and the results indicated the allowable breth touching speed might be doubled.

著者

小岩 健 寺尾 貞一 和辻 春樹 氏家 竹次郎

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協會會報 (ISSN:05148499)

巻号頁・発行日

no.69, pp.175-203, 1942-07-20

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For improving the quality of riveted joints, authors studied on matter of MS, HT and SS rivets, by means of chemical, mechanical and photomicrographical method, and concluded the relation of strength between their rivets and riveted joints.

著者

越賀 房夫 田中 甚吉 栗田 義之

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.129, pp.267-276, 1971-06

被引用文献数

2

---

Effects of stress-relieving heat treatment on brittle fracture initiation in welded structures are quantitatively discussed in terms or fracture mechanics. The basic concept employed for discussion is that brittle fracture should initiate when tensile yield zone formed ahead of a pre-existing crack attains a critical size depending on the material. The critical zone size as a function of temperature is predictable from Charpy-V transition temperature. Metallurgical information on welding residual stress and Charpy-V data for various conditions of heat treatment is compiled and put into the proposed logical frame of fracture mechanics. There is a divergence of conclusion for every case of steel type. Cases studied are those of an ordinary mild steel, two kinds of quenched-and-tempered high strength steels and a Mn-Mo steel for nuclear pressure vessels.

著者

豊貞 雅宏 藤井 英輔 野原 和宏 川口 喜昭 有持 和茂 井坂 和実

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1987, no.161, pp.343-356, 1987 (Released:2009-09-16)

参考文献数

20

被引用文献数

8 10

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It is well known that fracture toughness value is affected by strain rate. As for strain rate, the dependency of fracture toughness on fracture parameter rate has been usually studied. In the linear fracture mechanics, fracture parameter rate (dK/dt) is directly related to strain rate. However, in the non-linear fracture mechanics, the relation between fracture parameter rate (dδ/dt, dJ/dt) and strain rate has not yet been made clear. Therefore, in the safety assessment of real structures, non-linear fracture parameter can not be applied in case of which the effect of the strain rate on the fracture toughness needs to be considered.In this paper, fracture initiation point is assumed to be the tip of the intensely deformed non-linear zone defined by Rice, which is considered to show the maximum triaxial constraint. Then the strain rate at the supposed fracture initiation point is given in connection with remote strain rate which corresponds to the strain rate in non-cracked plate. By use of the newly difined strain rate, strain rate-temperature parameter is determined, which represents the effect of strain rate on fracture toughness. Compact tension tests and COD tests with different strain rate and temperature, as well as KId tests are carried out to verify above conception.

著者

小林 英一 末田 高嗣 西村 好之 大江 清登 池上 国広 山瀬 晴義

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.189, pp.347-356, 2001-06

被引用文献数

1

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本実験の結果をまとめると次の通りである。<BR>(1) ガイドフェンス部のテンションメンバ材に剛性の高い鋼製を用いると計算条件の2kn航走時に最大曳航荷重が380kN程度と相当過大になるが,剛性の低いナイロンロープを用いると110kN程度にまで軽減でき,実用性が高まる。<BR>(2) またトラップブームに作用する波浪荷重も剛性の低いナイロンロープを採用すると100kN程度にまで低減できる。<BR>本研究では, 具体的な製品開発に必要なオイルフェンスに作用する波浪荷重計測を行い, 構造設計に必要なデータを取得するとともに, 波浪中の挙動把握を水槽実験で実施した。また荒天下で安全にオイルフェンスを降下揚収できる装置を開発設計するために必要な諸データ取得のためハンドリング予備試験を実施すると共に, オイルフェンスの波浪強度を把握するためのフェンス主要部分模型を製作し, 引っ張り強度試験を実施した。さらにこれら等に基づいて, フェンスシステムの基本設計を行った。<BR>次に高波浪中でも安全かつ効率的にオイルフェンス等をハンドリングできる昇降装置等, およびオイルフェンスの自己膨張メカニズムの基本設計を行った。主要な成果を次にまとめる。<BR>(1) ガイドフェンス部のテンションメンバ材は鋼製を採用すると荷重が多大となり索径が大きくなりハンドリングが難しくなるが, 伸び剛性の低い材料の採用により, 波浪荷重が低減され実用的な設計が可能であることが判明した。<BR>(2) ガイドフェンス曳航力, 油回収装置の係留力等設計に必要な諸データが取得された。<BR>(3) 上記実験結果に基づき曳航索がナイロンロープ, ガイドフェンスがポリエステル繊維材から構成されるオイルフェンスシステムの試設計が完了した。<BR>(4) オイルフェンスを安全に投下・回収させるハンドリング装置設計のための水槽実験を実施しシュータ方式の有効性を実証した。<BR>(5) この実験結果に基づきフェンスの等をハンドリングする展張装置の基本設計を行った。<BR>(6) さらにオイルフェンスの自己膨張メカニズムの基本設計を行った。<BR>(7) 以上により最大波高6mの海域においても十分な滞油性能を有する実用的なオイルフェンスシステムの設計が完了し実用性の見通しが得られた。

著者

平松 秀基 豊田 政男

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.190, pp.591-598, 2001-12

被引用文献数

2 5

---

The importance of investigations of ductile crack initiation characteristics increases in the evaluation of the structure of integrity and the plastic forming of metal materials. A lot of examinations shout ductile crack initiation behavior for ferrite-pearlite steels have been carried out. However, for other structural materials, enough examination has not necessary been carried out. In this study, ductile crack initiation characteristics of SM 490 A, stainless steel SUS 316, high tension steel HT 950 and aluminum alloy A 5083(O) have been investigated by using notched round bar specimens. Dynamic tensile test has also been conducted for SUS 316. And the critical equivalent plastic strain as a function of the stress triaxiality at ductile crack initiation has been estimated by using FE analyses (ABAQUS ver. 5.7). The ductile crack initiation is triggered by the microvoid nucleation for SUS 316 and HT 950, and it was controlled by the void growth for SM 490 A and A 5083(O). The influence of stress triaxiality to critical equivalent plastic strain varies in the material. That relates to the process of ductile crack initiation of the material. The microvoid nucleation is seemed to be affected by stress triaxiality more strongly than the void growth.

著者

下村 芳弘 北沢 孝宗 乾 崇夫 梶谷 尚

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1979, no.146, pp.27-34, 1979 (Released:2009-09-04)

参考文献数

12

---

The low speed wave resistance theory developed by Baba4) and Maruo5) seems to be a promising theory to predict the wave resistance of conventional ships, because it includes the nonlinear effect of the free surface condition. The wave resistance curves calculated by the low speed theory, however, have large humps and hollows, and they do not agree with the measured7) 10) .In this paper, a refinement of the low speed theory is discussed by imposing the more accurate hull surface condition. The wavy source distribution added to satisfy the hull sruface condition is obtained numerically, and the wave resistance, the hull side wave profiles and the velocities around the hull surface are evaluated. The results coincide fairly well with the measured values, especially the humps and the hollows of the calculated wave resistance curves are remarkably reduced.It is ascertained that the added source distribution plays an important role to improve the low speed wave resistance theory, in spite that its strength is one-order smaller than that of the double model source.

著者

平松 秀基 道場 康二 豊田 政男

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.2002, no.192, pp.563-571, 2002 (Released:2007-05-30)

参考文献数

16

被引用文献数

7 8

---

Significance of investigation of ductile crack initiation characteristics in the evaluation of structure of integrity is on the increase. It is significant to predict ductile crack initiation in plastic forming of metal materials. A lot of examinations about ductile crack initiation behavior under high stress triaxiality for structural steels have been conducted using notched round bar tensile specimens. Satisfactory examination under low stress triaxiality, however, has not necessary been conducted thus far.Ductile crack initiation characteristics of aluminum alloy A 5083-O and high strength steel HT 950 under low stress triaxiality have been investigated using plate tensile specimens in this study. The critical equivalent plastic strain as a function of the stress triaxiality at ductile crack initiation has been estimated using FE analyses.The ductile crack initiation is triggered by secondary void nucleation under low stress triaxiality, and it is controlled by initial void growth under high stress triaxiality for A 5083-O. The ductile crack initiation is triggered by void nucleation under the wide range of stress triaxiality. The critical diameter of void at ductile crack initiation varies with stress triaxiality for both materials. The critical equivalent plastic strain at ductile crack initiation under low stress triaxiality is seemed to be overestimated by extrapolation using curve fitted to test results under high stress triaxiality on the assumption that critical void diameter would be constant.

著者

平賀 譲

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協會會報 (ISSN:05148499)

巻号頁・発行日

no.40, pp.209-228, 1927-03-15

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The Navy Experimental Tank was destroyed by the earthquake, 1923. The building of new large tank is now going on, but a few years more will be required for completion. So that as a means of the exigency, following an example of Viscount Tokugawa's small tank (25'×3'×2')in his residence for his own experimental work, a small tank (100'×6'×4') has been constructed, provided with the carriage, dynamometer &c. all in the principle of Froude's Tank. In spite of the small value of VL, the measured resistances of 4 feet and 5 feet ship models were found very steady and accurate. In comparing with the results of the Mitsubishi Tank and those of the late navy tank for the same models or similar models applying the Froude's law of friction, the new small tank gave pleasingly good results. The author from his own experience on the design of ships emphasizes an advantage of providing such a tank in a shipyard for the personal guidance of its naval architects, although he, by no means, entertains an idea that small tank shall have the same reliability and accuracy of a large one. It is interesting however that there are certain unique advantages on the side of a small tank, and the experiments to utilize these advantages have been planned and some of them already undertaken, such as the investigations of ships resistance on (a) the effect of the temperature or viscosity to throw some light on the law of friction by simply beating or cooling water in the tank, (b) the effect of the density by easily changing the quality of water, (c) the effect of the depth and width of water by means of simply lowering or raising the dynamometer and a part of the carriage and providing false sides to the tank, all these will be immensely expensive to do for large tanks if not impossible.

著者

山内 重樹 手塚 研治

出版者

日本造船学会

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

no.178, pp.707-712, 1995

参考文献数

4

被引用文献数

4 6

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Nesting in shipbuilding is work that complicated parts of various sizes are arranged in steel plate as many as possible. The work has been done by experts. We have developed the automatic nesting system by use of Genetic Algorithm (GA) and new algorithm which are introduced from heuristic rules which the experts have. We call the algorithm "geometrical simplification of parts pairing algorithm" and "grouping algorithm". This paper describes that the combination with GA and new algorithm which we propose is effective to the processing speed of the system and the scrap ratio of nesting and that the system is available for practical use.

著者

金 相賢 大和 裕幸

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.2000, no.188, pp.211-223, 2000 (Released:2009-09-16)

参考文献数

12

---

In this paper, the longitudinal control system for full-submerged hydrofoil based on wave prediction was proposed to exclude human operation and to improve the performance of contouring waves. The proposed control system consists of optimal preview servo system, Kalman filter and generation of future reference input and future wave disturbance.In the proposed control system, the wave disturbance and the wave elevation were filtered and predicted by using sensor signals, Kalman filter, 30th linear prediction model and the augmented system. Then the future reference input and the future wave disturbance were generated by using predicted wave disturbance and wave elevation, and were used to calculate the feedforward control input in the optimal preview servo system. And also the future reference was modified based on the significant wave height for ship height control.The simulation results show that the proposed control system has good performance of contouring waves in the follow sea and the hydrofoil regulates heave and pitch motion in low significant wave height and contours the waves in high significant wave height without human operation. And also the experiment was performed to confirm the algorithm of filtering of wave disturbance and hydrofoil motion, and calculation of wave elevation.

著者

土井 康明 上田 隆浩 茂里 一紘 二宮 伸治

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.186, pp.89-96, 1999-12

被引用文献数

3 2

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A numerical simulation method of the motion of a rowing race boat is developed in order to evaluate the performance of oar size and rowing pattern. The driving force of blade is measured experimentally. The resistance of the boat is referred to the experimental result carried out in a towing tank. The motion of crew, which is most important in the simulation, is evaluated from the equation of a boat motion where the other terms are experimentally measured. These measured external forces are modeled by Fourier series or polynominal expressions. The equation of a boat motion is numerically solved by use of Runge-Kutta method. The Simulated boat velocity and force acting on blade are compared with the measured ones. The experiment was carried out in cooperation with the crew at Hiroshima University. Good agreement with the simulated results and measured ones shows that the present simulation method has merit to evaluate the rowing performance. Through the present simulation method, outboard length, blade area, stroke rage and phase of catch are evaluated.

著者

正田 茂

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協會會報 (ISSN:05148499)

巻号頁・発行日

no.35, pp.83-135, 1924-12-15

著者

藤崎 廣 小野 暢三 吉識 雅夫 福田 啓二

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協會會報 (ISSN:05148499)

巻号頁・発行日

no.82, pp.87-96, 1950-07

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It is said that electrification of the auxiliaries on small cargo ship is more useful than that of steam drive. The O.S.K steamer"Ondo Maru"(680 gross tons) had installed a main diesel engine of 600 B.H.P., steam driven auxiliary engines and an oil burning boiler. The fuel consumption was too much and so the next ship of same type"Mihara Maru"had installed the electric driven auxiliaries of d.c. system, and got good result. These valuable experiences tell us that the electrification is more useful than steam drive. The electrification of the auxiliaries had almost adapted the d.c. system, by the reason that the characteristics for winch and windlass are more suitable than a.c. system. Therefore, the a.c. system for auxiliaries of cargo ship has been disregarded. However, it is considered that the a.c. system for the auxiliaries of small cargo ship is worth studing. Now, our company decided to build two small cargo ships of"F"type (about 510 gross tons) and I am planning the electrification of the a.c. 230 volts, 60 cycles, 3 phase, for the auxiliaries. Here we call, temporarily, the ship less than 500 gross tons, as the"small cargo ship". The ship of"F"type is installed a main Diesel engine of 550 B.H.P. and following auxiliares, The generater for the source of these auxiliaries are two sets of 55 k.v.a. which are drived by a Diesel engine respectively. (a) Winches 4 sets of 15 k.w. (b) Windlass 1 sets of 15 k.w. (c) Capstan 1 sets of 2 k.w. (d) Pumps 6 sets of 0.75 to 5 k.w. There are other electric installations as follows : (a) Room heaters. (b) Ordinary illuminating lamps and navigating lamps etc. (c) Wireless telegraphy. (d) Radio direction finder. (e) Echo sounding equipment. The electrification of winch, windlass and capstan by the induction motors of pole change wound rotor type, shall have many points of consideration. In this paper, it is concluded that the electrification of the auxiliaries on small cargo ship by a.c. system is rather suitable for quick building of ship, and cheapness of equipments and easy maintenance of auxiliaries.

著者

清水 菊平 河相 清

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協會會報 (ISSN:05148499)

巻号頁・発行日

no.53, pp.119-139, 1934-03-31

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This engine is of two-cycle airless-injection type and has been developed by Mitsubishi Zosen Kaisha after about five years of experiments and studies. The first four sets of the engine were adopted by Osaka Shosen Kaisha for their M. Ss. "NANKAI MARU" and "HOKKAI MARU" and the actual service records have now been obtained. This paper deals with some special features of the engine, such as the scavenging, combustion, mechanical efficiency and construction.

著者

矢ケ崎 正經

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協會會報 (ISSN:05148499)

巻号頁・発行日

no.37, pp.5-14, 1925-10

著者

徳川 武定 鬼頭 史城 西山 哲男 丸尾 孟 田宮 真 谷 初蔵 木下 昌雄

出版者

公益社団法人日本船舶海洋工学会

雑誌

造船協會論文集 (ISSN:05148499)

巻号頁・発行日

no.94, pp.69-79, 232, 1954-02

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As is only too well known, the quick diving is one of the essential qualities of the presentday submarines. In this paper, first of all, the authors have made an analytical study on the diving motion of a submarine. In the next, the question may be solved as to how much degree the trim angle of the vessel does alter, when the vessel submerges with constant speed Vo, along the specified course, into the given depth of immersion D, in the duration of time T, under the regulation by a pair of horizontal rudders with a certain rudder angle. Fortunate to say, we have still on hand the underwater-performance curves based on the experimental results of the several types of submarine-models, and using them, we obtained numerical values of both the trim and rudder angles of submarine when she performs the diving motion as mentioned above. In conclusion, it is shown that, if we try to make the time duration needed T, as short as possible, the allowance in inclination of hull matters more, rather than the addition of rudder angle.