著者

中村 昌彦 浅川 賢一 百留 忠洋 川谷 哲也

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.18, pp.143-156, 2013

被引用文献数

1

---

A prototype of a 3000m-class underwater glider for virtual mooring is being developed by JAMSTEC (Japan Agency for Marine-Earth Science and Technology) with RIAM (Research Institute for Applied Mechanics) of Kyushu University. The vehicle houses an observation equipment and glides back and forth between the sea surface and the seabed collecting ocean data in a specific area (virtual mooring area) for more than one year.This paper summarizes the design concept and an outline of the glider and shows the results of the gliding tests in a towing tank.

著者

児玉 良明 角川 明 高橋 孝仁 石川 暁 川北 千春 金川 健 戸田 保幸 加藤 洋治 地本 晶彦 山下 和春 永松 哲朗

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.1-13, 2002 (Released:2007-05-30)

参考文献数

17

被引用文献数

5 2

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This paper is the first 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 preparatory study for the full-scale experiment using a 116m-long ship. In the present study, first the skin friction reduction effect by microbubbles was investigated including the use of an array-of-holes plate for bubble generation, the effects of streamwise pressure gradient, surface curvature, and vertical plate, the sea-water effect, and the effect of bubble size. Bubble generators for the full-scale experiment were designed and built, and a preliminary injection experiment was carried out. Two new measuring devices for the full-scale experiment were developed; they are skin friction sensors and local void ratio sensors. Microbubble experiments were carried out in a 400m-long towing tank using a 50m-long flat plate ship, in order to obtain the scale effect data and to confirm the validity of the new devices for the full-scale experiment. The use of adhesives to fix measurement devices and cables on the hull surface was tested and established. The hydrodynamic fairing of the cables was also tested and established. Finally, a preliminary microbubble experiment using a small ship was carried out and the bubble behavior was observed.

著者

清水 澄 荒木 睦郎 越賀 房夫

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1961, no.109, pp.417-423, 1961

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The bigger the size of ship becomes, the more complicate questions arise on the hull construction. The gunwale connection in the mammouth ship is one of the most grave questions, because of the poor purchasability of the big size gunwale angles, the hard workmanship on the riveting of large diametres, and etc. As the countermeasures for the above-mentioned questions, the Tee-section or angle built-up by welding, or else the rounded gunwale, were already proposed.<BR>The authors examine the current practices of the gunwale connection in the mammouth ship and propose a new type of welded gunwale, "L-gunwale", as the most promising.

著者

茂里 一紘 土井 康明 伊藤 昌広 岸本 由豆流

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.1991, no.169, pp.143-149, 1991 (Released:2009-09-04)

参考文献数

4

---

A semi-submersible displacement-type high-speed ship with wings is studied on its stability control by flaps.The vehicle, called HSV (High-speed Semi-submersible Vehicle with wings) here, is consisting of a main hull, main and tail wings with flaps, and a strut to support the super-structure. The HSV floats at a certain draft like a conventional ship while it is still, and it submerges when it moves forward due to a downward lift force induced by the main wings. HSV cannot have enough upright moment as conventional ships because of its small waterplane area. HSV is expected to be stable by an active control of flaps.Experiments are carried out to study about the possibility of the stability control by the flaps of the main and tail wings. An automatic control system is developed under which HSV is towed with the heaving, rolling, pitching and yawing motions free. The angles of attack of flaps are controlled after the measured ship motion in order to stabilize the motion.It is concluded that, although the control is not perfect due to the mechanical limitation of the used system, HSV can run stably by the active control of the flaps. The experiments among regular waves made clear that waves could not be a serious factor for the stability of HSV.

著者

福井 順平

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會會報 (ISSN:18842054)

巻号頁・発行日

vol.1926, no.39, pp.129-140, 1926-11-30 (Released:2009-09-04)

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The apparatus is to quickly haul the vessel bodily above water in order to rescue the crew in sunken submarines. Every submarine is attached with a special fitting with a projection which a leading wire and a bouy are joined to. The wire and the bouy have connection to a telephone bouy. If the vessel founders and the telephone bouy lifts, the above mentioned bouy and wire can be picked up. From one side of a salvage vessel another fitting with a tenon is led downward along the wire and clutched to the above mentioned fitting on the submarine. A tackle is joined to this fitting and the fall is led over the salvage vessel to another submarine hunged on the opposite side of the former.A suitable number of such apparatuses are provided on the wrecked submarine, the salvage vessel, and the hunged submarine. On the completion of all apparatuses, the hunged submarine is sunk down by flooding its inside. The weight of the hunged submarine and some pull given by winches are available in hauling the wrecked submarine upon water surface. Afterwards the sunken hunged submarine is again lifted above water by applying pneumatic air.

著者

永井 保 浜本 剛実 守 国夫

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.1972, no.131, pp.281-295, 1972 (Released:2009-09-04)

参考文献数

10

被引用文献数

2 2

---

Taking pictures of the motion of a water surface at the impact of flat and concaved rectangular plates on the water, we obtained the phenomena which the air was entrapped and compressed between the water surface and plate surface, while blowing out through the contact part of both surfaces. In order to develop the equation of air motion reasonably, we took the energy dissipation due to volume change of entrapped air into consideration, hence, an unknown coefficient was herein introduced. It was suitably determined from measured data by the dropping test already done by one of authors. The aspect ratio of rectangular plate was chosen beyond about three, and plates have one-third or full scale when compared with the plate panels of both destroyers and torpedo boats. We finally obtained the experimental formula of impulsive water pressure covering M/ρl2 from about 2 through 7, which might be considered most useful for practical purpose.To get the elasto-plastic response of concaved rectangular plates, the damping effect due to compressed air was also introduced into the theoretical treatment, and this damping coefficient was approximately determined so as to satisfy the critical damping condition of the plate, such as the case of flat plates. We therefore obtained the experimental formula of the response.Within plate scantlings used in our experiment, if the plate is repeatedly dropped on the water from the same height the induced concavity will finally converge to the certain magnitude. And hence, applying those two formulae obtained above to solve such phenomena, reasonable coincidences concerning concavities after each drop were obtained between the computed results by numerical analysis and measured data.

著者

恵美 洋彦 湯浅 通史 熊野 厚 山本 規雄 有馬 俊朗 海野 昌俊

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.1993, no.174, pp.735-744, 1993 (Released:2009-09-04)

参考文献数

7

被引用文献数

9 9

---

Protections of corrosion in main hull structures and offshore structures have a great influence on their life. The authors have studied on protective means of the corrosions with investigation of actual conditions of aging effects to coatings in water ballast tanks for 22 ships aged 4 to 20 years.In the report, is described, i) a tendency of secular deterioration of the coatings, ii) primary factor of infulence to the deterioration, iii) forecast method of the coating conditions with aging effects, and iv) a proposal of the best specification and a maintenance for a long life service of ships.

著者

林 昌奎 小林 豪毅 山西 一臣 鈴木 文博

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.2003, no.194, pp.241-246, 2003 (Released:2007-05-30)

参考文献数

8

被引用文献数

2

---

Microwave remote sensing is effective technique for sea surface measurement. For example, it enables us to know the wind vector on global scale. In order to develop more advanced measurement, it is necessary to understand the mechanism of microwave scattering at sea surface. This phenomenon consists of two physical processes. One is the formation of sea surface by the composite action of wind, waves and currents, and the other is microwave scattering at that surface. Because these processes are so complicated, appropriate models are not established. In this paper, the relation between sea surface condition and microwave scattering is investigated. Microwave scattering from wind wave surfaces is measured in the experimental tank and the results are analyzed by scattering coefficients and Doppler spectra. In order to connect these values with water surface parameters, surface condition is investigated minutely. The energy of high frequency waves is expressed by the friction velocity, and so it is presumed that there is the universal law between friction velocity and scattering coefficient. Since wind-generated current exist, the usual dispersion relation is not available. Furthermore, very high frequency components move at the phase velocity of components near the spectral peak. The results of Doppler spectra agree with that phenomenon.

著者

加藤 弘

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1956, no.89, pp.59-64, 1956 (Released:2007-05-28)

参考文献数

11

被引用文献数

2 2

---

The natural period of roll of ships in any condition can in general be obtained by the well known formula T=2πK√<gm>, where K is the transverse radius of gyration of ship, m the metacentric height and g the acceleration due to gravity. The radius of gyration has hitherto been expressed by the breadth moulded and recently by the breadth and depth moulded, but these simple methods can not afford satisfactory results. After investigations of rolling materials of many vessels, new formulae for K have been found to give sufficiently accurate values. For merchant vessels the formula is written as(K/B)2=f[Cbcu+1.10Cu(1-Cb)(H/d-2.20)+H/B2].where B is the breadth moulded, Cb the block coefficient, Cu the upper deck area coefficient, H the effective depth, i e, the depth moulded plus mean height of projected areas on Profile of erections and deckhouses, d the mean draught and f the coefficient depending on the type of ship. The value of f is 0.125 for passenger, passenger and cargo, and cargo vessels. The formula for K of warships is of the same form as for merchant vessels. The errors of K-values obtained by the new formulae have been shown within the limits of about 3 per cent.

著者

山本 熙

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1956, no.90, pp.189-208, 1956 (Released:2009-09-16)

参考文献数

36

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A hundred years ago, a train-ferry service across the Firth of Forth in Scotland was born, and fourty years have passed since the Japanese Government Railways inaugurated a car-float service between Shimonoseki and Moji.On this occasion, it is of interest to look back on the development of this facility in foreign countries and in Japan.Since the first train-ferry the “Leviathan” crossed the Firth of Forth (1), similar services were inaugurated on the River Rhine (2), the Susquehanna River in the United States and also across the Nile Rever (3) in Egypt.In this paper, the stages of this development are arranged as undermentioned, and various kinds of landing means are classified as follows : 1. The cradle age of train ferries. -In the first 16 years, the train ferry services were in their infancy, all operating across rivers or firths.2. The epock making train-ferry. -In 1868, this facility was carried out on the Lake Constance in Switzerland (4), where the crossing was exposed and rough, so that people got an idea on the trustworthiness of the train-ferry service even on an open sea.All these installations were commenced in the last 17 years, paving the way for the train-ferries of the future.Kinds of Landing Arrangement of train-ferries : -(1) Shipway or Slope Type a. Shipway and Travelling Platform.b. Stepped Slopeways.(2) Crane or Elevator Type a. Elevator ashore.b. Elevator aboard.(3) Elevating or Tidal Deck Type(4) Movable Bridge Type3. The development of train-ferry services in Denmark.4. The development of the train-ferries on Lake Michigan.5. The technically noteworthy development of the installations of the Warnemunde-Gedser and Sassnity-Tralleborg lines.6. The popularization and development of train-ferries in twentieth century.7. Train ferries in Japan.From the history of train-ferries, the methods of laying tracks on deck are classified as follows : -1. Through Track Type T2. Head Terminal Type B (from bow) S (from stern) 3. Isolated Track Type I4. Athwart Track Type AThe types of tracks on deck are mostly determined by the local conditions of the berths ; some were obliged to select an inferior method due to the original landing arrangement when further improvement was required. This is a point worthy of special consideration when designing ferry boat and landing arrangement in the future.

著者

川島 敏彦 芳村 康男 鈴木 四郎 大本 耕司

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.2003, no.193, pp.1-9, 2003 (Released:2007-05-30)

参考文献数

7

被引用文献数

3

---

Fishing boats have several restrictions on their machinery arrangements and space utility on deck. For the improvement of the stability and the deck utility, the fitting of a bulge on sidewall of the vessel is one of the solutions. However, the bulge generally makes a significant increase of hull resistance and loss of speed.At the principal design stage of the elongation of the fisheries research ship“Ushio-maru”, the University of Hokkaido, the authors examined the suitable form of the bulge to improve the stability without increase of the hull resistance. For this purpose, systematic calculations of wave making resistance by Rankine's source method and model experiments using a circulating water channel have been conducted. In this process, it has been found that the optimized bulge form can decrease the hull resistance.In this paper, the authors discuss about the mechanism of the hull resistance decrease by a bulge based on the view point of flow field around hull and propose the suitable method to design the bulge form. Thistechnique has been applied to the actual elongation design of“Ushio-maru”, and then it has been confirmed by the experimental model tests as well as the full scale trials.

著者

藤田 譲 堀 徹 井上 清 村田 修二 摩嶋 禎規

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.1989, no.165, pp.215-224, 1989 (Released:2009-09-16)

参考文献数

9

---

Wooden ships up to around 55 m in length have been so far designed and built with hulls of double skin planking which consists of each single layer of longitudinal planking and diagonal planking crossing with an angle of 45°. Based on successful operation of these ships, large-scaled wooden ships of around 70 m are recently under consideration adopting hulls of triple skin planking. The triple skin planking consists of the outer skin of a single layer of longitudinal planking and the inner skin of double layers of diagonal planking wihch cross the longitudinal planks with angles (θ) of ±45°.Experiments and theoretical investigation as listed in the followings have been made in order to establish design formulae for the longitudinal bending and shear strength of hulls of the triple skin planking : (1) Simplified formulae are induced for calculating the rigidities and the stresses of the triple skin planking, and the practical methods are shown on the longitudinal and shear strength of hulls.(2) The results of the structural loading tests of the box-shaped ship model sizing 6.54 × 0.9 × 1.04 m are compared with the structural analyses by the three-dimensional (3D) truss model. The structural members of the test model are in 1/2 scale of those of a prototype ship except the overall dimensions.(3) The results of the same kind of 3D truss analyses made for the whole hull of the prototype ship are compared with the calculations by simplified formulae.It is concluded as follows : ·The 3D truss model reasonably represents the behaviour of the triple skin planking.The simplified calculation methods can be applied to actual ship design.·The effectiveness of the diagonal planking on the longitudinal bending strenth is 25 % theoretically when θ= ±45°, and a practical value of 20 % is proposed.·The inner skin of two layers of diagonal planking predominantly carries shear forces. The axial stresses of diagonal planks are simply obtained by doubling the shear stresses when θ= ±45°.·Longitudinal members such as gunwale, chine and keel contribute to the shear strength of a hull by their sectional areas multiplied by a factor of 4G/E theoretically when the rotations of the sections are restrained by neighbouring members. The actual degree of contribution is subject to further investigation.

著者

Yuzuru Hiraga

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會會報 (ISSN:18842054)

巻号頁・発行日

vol.1934, no.55, pp.159-199, 1934 (Released:2007-05-29)

被引用文献数

1 4

著者

村重 淳 木下 健

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.1990, no.168, pp.183-192, 1990 (Released:2009-09-16)

参考文献数

12

被引用文献数

1 2

---

Wave focusing has been attracting ocean engineers as one of the most promising techniques to control ocean waves. It creates a calm sea area and helps efficient utilization of wave energy. In the present work, a hydrodynamic singularity distribution which expresses a wave focusing lens is derived by the method of matched asymptotic expansion, assuming slenderness of the lens and high frequency of incident waves. The singularity distribution gives the following necessary conditions for scattered waves in each section of the lens : there is no reflection from the lens and the transmitted waves suffer a phase shift in passing the lens. The phase shift is given by the wavenumber and the distance between the section and the focus. From these conditions, we examine a sectional shape of the lens and determine the whole geometry.It is shown by experiments and numerical computations using the two dimensional doublet distribution method that a submerged chevron shape plate, which is suitably folded, scatters a wave system which satisfies the above conditions at a certain wave frequency, but not in wide band of wave frequencies because of dispersion of water waves.Then it is shown by experiments that a certain number of submerged circular cylinders, which are horizontally arranged at intervals just like a raft, transmits waves which have enough phase shift to focus waves but reflects almost no waves in wide band of wave frequencies.Finally, we examine performances of three types of lens, namely, submerged flat plate, submerged chevron shape plate, and submerged circular cylinders, in both regular and irregular waves. It is shown by numerical computations that the wave focusing efficiency of the lens consisting of circular cylinders is about twice that of the flat plate type lens and that the drift force acting on the former is less than half of that on the latter in irregular waves.

著者

武藤 昌太郎 宮田 貞一 阿部 武

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1964, no.116, pp.169-183, 1964 (Released:2009-07-23)

参考文献数

4

被引用文献数

1

---

In recent years, the productivity in shipbuilding has greatly been increased by means of “block” or subassembly method with aid of advanced welding technique and more fruitful results may well be expected through “three dimensional block” method in lieu of conventional flat block method.However, when composing the massive, three dimedsional block is thought of, various problems must be solved such as the accuracy in dimension & shape of block, the area of assembly yard, crane capacity, and lifting pads etc.The present paper is concerned with the three dimensional block method which has been established and placed successfully in use of cargo ship construction in this yard as the first attempt in the ordinary shipyard except the newly built, special shipyard in Denmark.

著者

丸尾 孟 石井 正夫

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1964, no.116, pp.22-29, 1964 (Released:2010-01-20)

参考文献数

3

被引用文献数

1

---

It is theoretically well known that when the two bodies are running in the same direction and in a pair in water and/or on water surface, sometimes their total wave making resistance becomes smaller than that of the individual body due to the mutual interference of the waves caused.The proposed semi-submerged ship of the least wave resistance consists of the submerged main hull of the so-called Rankine's ovoid and the surface piercing bridge having sectional area of square cosine curve.Theoretically and experimentally, the combined hull form as mentioned above thus proves its capability of reducing the wave resistance tremendously in a certain specific speed range, i. e., the dimensions of bridge can be chosen so that the waves caused by the submerged hull running near surface may be diminished by the waves of the bridge at the specific speed.Furthermore, it is investigated that the upper limit of the optimum speed range of this type of vessel is between 0.35 and 0.40 in Froude's number.

著者

渡辺 四郎 坂尾 稔 小丸 捧 小西 績男

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1967, no.122, pp.36-42, 1967 (Released:2009-09-04)

参考文献数

2

---

Aiming to reduce the viscous resistance of fat and low speed ships as tankers, new ship form encouraging buttock flow is proposed.Resistance and self-propulsion tests of Cb=0.88 and 0.84 model are proceeded. Characteristics of the new ship form are remarkably less profile drag and less wake gain.The latter defect can be improved by properly designed skeg form and bilge corner form.

著者

山本 善之 角 洋一 鈴木 和夫 鈴木 政直 鈴木 隆男

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.1985, no.158, pp.291-300, 1985 (Released:2009-09-04)

参考文献数

16

被引用文献数

1 1

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In 1935 the Forth Fleet of the Imperial Navy encountered a typhoon in the occasion of the naval grand maneuvers in the Pacific Ocean off the northern coast of Honshu Island of Japan, and many naval vessels of the fleet were damaged. Destroyers “HATSUYUKI” and “YUGIRI” lost their fore bodies being splitted in front of bridges with 51 crews on board. They were designed on the basis of the theories and experiments of those days ; they had long forecastles with large flare for high performance in rough seas, and their section moduli were designed to be in proportion to the estimated longitudinal bending moment for the reduction of hull weight.In this paper the authors attempt to analyze the disaster of the two destroyers theoretically with the aid of the knowledge available today. The wave bending moments acting on the destroyers are calculated for several wave conditions by TSLAM based on the nonlinear theory of ship motions, and they are compared with the ultimate moment. It is shown from the calculated results that the sagging moments are increased by slamming to the flare and buoyancy of the long forecastle dipped into a wave. If the longitudinal strength were designed in such a manner that the section modulus had an almost constant value sufficiently far towards the fore body of the vessel, the disaster of the two destroyers could have been avoided.

著者

中井 裕司 田畑 光敏

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.1990, no.168, pp.623-628, 1990

被引用文献数

3

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SHIP & OCEAN FOUNDATION studies on Pilot Model for CIM in shipbulding. One of the subjects in this project, we researched on modeling for Piping Arrangement in Shipbuilding. This paper proposed Piping Arrangement Model based on Object Oriented and Entity-Relationship method. Following this concept, we developed Prototype System by Smalltalk80, this is object oriented program language and enviroment.<BR>The Prototype System applied to midship part of oil tanker and obtained efficiency of proposed Piping Arrangement Model.

著者

松本 喜太郎

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會會報 (ISSN:18842054)

巻号頁・発行日

vol.1951, no.73, pp.115-128, 1951 (Released:2009-09-04)

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The shell plating of any ship near her screw propeller must be exposed to the statical water pressure due to her draft and flow of water around as well as the dynamical water pressure coursed by the screw propeller in action.If some part of the structure of the ship is inadequately weak, this part may be destroyed.Regarding to this point, the author tried to find out how we can select the safe and adequate thickness of shell plating of this part.