西部造船会々報

表紙

原稿種別: 表紙
p. Cover1-
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_Cover1

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目次

原稿種別: 目次
p. Toc1-
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_Toc1

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本会記事

原稿種別: 付録等
p. i-v
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_i

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船尾変動圧力に及ぼすスキュー角の影響について

山崎正三郎, 伊藤政光, 柳田稔

原稿種別: 本文
p. 1-13
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_1

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The number of installing Highly Skewed Propellers (HSP) behind merchant ships have been increasing considerably for the purpose of reducing propeller induced pressure fluctuations. Many results of experiments about the effect of HSP have been reported and the usefulness of HSP to reduce pressure fluctuations has been confirmed. Although the amount of effects seems to be much varied among experiments. The purpose of present report is to find the simple and accurate relations between the skew angle and the amount of reducing propeller induced pressure fluctuations. Two kinds of data were used to find the relations. One is the experiments carried out by authors and the other is the results reported in references. Authors used four model propellers having skew angle 0, 20, 40 and 60 degrees designed to have nearly same spanwise load distributions. Pressure fluctuations on a flat plate above the propellers were measured for four sets of tip clearace and three kinds of simulated wake fields in the cavitation tunnel. The experimental results indicated that tip clearance Z_t/D below 0.25 and the wake distribution have scarcely no effect on the reducing ratio of pressure fluctuations due to skews. Then further attention was payed for the relation between the pitch distribution and the skew angle. After Johnsson the amount of decreasing pitch near the propeller tip required to have same spanwise load distribution for increased skew angle was obtained. Using the above relation, data corresponding to the operating conditions of usual merchant ships, 0.18<K_T<0.22, 1.8<σ_n<3.6 and 0.05<Z_t/D<0.27 were analized. As a result the fairly good relations between the skew angle and the reducing pressure fluctuations under the same spanwise load conditions and the same pitch distributions were obtained

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A Study on Performance of Contrarotating Propellers

中西正治, 池田勉

原稿種別: 本文
p. 15-25
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_15

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The performance of a contrarotating propeller for a medium sized tanker was studied by model experiments both in towing tank and in cavitation tunnel. In this study, the fore propeller was designed to have the same diameter as that of the existing conventional propeller, while a lower speed diesel engine with the same output as the existing one was chosen. Morgan's design procedure based on Lerbs' lifting line theory was applied. To obtain the reliable experimental data, the same dynamometer was used both for open-water and self-propulsion tests. The results of the tests on the contrarotating propeller showed 12% to 14% reduction in power at the design speed in comparison with the corresponding conventional propeller. This rate of power reduction was almost the same as those reported before. Further, no deterioration in cavitation characteristics was expected, judging from the results of cavitation tests. Through the tests, the usefulness of the design method by Morgan was proved.

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定常状態のプロペラに及ぼす粘性の影響(II)

上田耕平

原稿種別: 本文
p. 27-42
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_27

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As the continuation of the previous paper (Transactions of the West-Japan Society of Naval Architects, No.69, 1985), the author calculates numerically the propeller characteristics at seven Propeller Reynords numbers (R_<nD>=n_rD^2/υ) from 7.02×10^3 to 8.12×10^7. Then he examines scale effects of propeller performance.

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Wigley模型の一粘性流モデル(第3報) : 流れの測定・可視化と境界層計算結果の比較

土屋好寛, 金井誠, 梶谷尚

原稿種別: 本文
p. 43-52
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_43

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An expression of outer potential flow of double model approximation was tried for Wigley models in the first report. The inner 3-D boundary layers were computed under a small cross flow assumption in the second report. In the present report, experiments and analyses are conducted at low Froude number F_n=0.13. Velocity components through boundary layers, hull surface pressures are measured in a towing tank, while limiting streamlines are visualized in a circulating water channel. Results are compared with evaluated. Viscous flow characteristics are discussed. The present flow model reproduces viscous flow features well globally. However accounts for free surface effect and more detailed treatment of flow around keel lines are necessary for further analyses.

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粘性抵抗最小形状の研究(第2報)

別所正利, 経塚雄策, 塩川朋久

原稿種別: 本文
p. 53-65
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_53

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Making use of his approximate resistance integral, J.L. Hess tries to search low drag shape in turbulent region. Following his way, the authors try to obtain the condition to minimize the resistance, propose and carry out computations by iteration method developed for this purpose making use of the inverse method solving the potential flow. The present report deals with two dimensional cylinders but the former with axi-symmetrical body. The results are similar in both cases, the optimum shape is nearly a parablola or a circular arc and has less resistance than the ellipe and parabolic cylinder.

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境界要素法による非線形造波問題の数値解析

新開明二, 井関俊夫

原稿種別: 本文
p. 67-76
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_67

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The boundary element technique is applied to the analysis of the three dimensional non-linear water wave which is generated by the flap type wave maker in the towing tank. The proposed method is an extention of the method presented for the sloshing problems. In this method, a linear element scheme is employed for the discretization of the boundary integral equation, and the perturbation technique is introduced in conjunction with the boundary element formula. Several numerical examples are presented by using the proposed method. And experiments are carried out for any conditions, in order to examine the properties of this method. Fairly good agreement is obtained between numerical results and measured experimental results.

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吸収式造波装置の研究

経塚雄策

原稿種別: 本文
p. 77-88
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_77

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Theoretical and experimental investigations on Salter's absorbing wave maker are presented, which could generate waves under given command signals and could act as an absorber to incoming waves at the same time. The problem is formulated for a semi-infinite channel and solutions are determined with the linear-theory. The equation for the complete absorption of waves is derived. Theoretical transfer function of linear filter is pressented, where the flap of the wave maker is driven by D.C. moter controlled by the signal of hydrodynamic force acting on the flap. In order to verify this theory, the following experiments are carried out in a channel of 6m length: (a) measurements of the reflected waves when the movement of the flap is restrained, (b) measurements of the reflected waves when the wave maker is driven as an absorber, (c) measurements of surface elevations in the channel for two cases in which the wave maker acts as an usual one and an absorbing one at one end of the channel and the rigid wall at the other end. From those experiments, it is confirmed that an absorbing wave maker studied here has excellent property compared with an usual wave maker. The reflected wave coefficient attains to 8% by this wave maker at the optimum frequency. In conclusion, a system of this type would be very useful for the improvement of the experimental accuracy in a short tank.

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海洋温度差発電のためのステーションの運動と係留

小寺山亘, 中村昌彦, 大楠丹

原稿種別: 本文
p. 89-97
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_89

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In this paper, motions of a semi-submerged platform for OTEC plant moored in regular waves are investigated experimentally and theoretically. Results of experiments and calculations show that the motions in regular waves are much smaller than those of ship-type platforms and the viscouse forces acting on the cold-water pipe have an great effect on the pitching motion at its resonant freqency. From a point of view on the design of the mooring system, a steady downward force due to a mooring line tensions should be noticed. Semi-submerged platforms have very small water plane area and steady drag forces acting on mooring lines are large because the lines are very long in the case of OTEC.

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船舶の海難位置と津浪位相の統計的関係 : 沿岸海洋波の生成理論(その44)

真鍋大覚

原稿種別: 本文
p. 99-121
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_99

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During past 11 years of 1969-1981, 10 typical huge vessels were damaged in the east coast of Japan. One of the most reliable causes is considered as the shock of unknown Seismic waves. Phase difference between the position of accident and stationary tidal wave are analysed only as 0.064-39.597km for 72 earthquakes in the Pacific Ocean.

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高速艇の新しい強度計算法

金子幸雄, 木原和之

原稿種別: 本文
p. 123-133
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_123

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In recently years, large high speed craft have been planned and constructed with hull of aluminium alloy for overall economical advantage. Increase in craft length causes relative decrease in rigidity of the hull girder. Therefore, the longitudinal strength of the hull becomes an important factor to be considered for designing large size high speed craft. In this paper, a new guide line of longitudinal bending moment of large high speed craft caused by high speed running in waves is presented. The amounts of beniding moment are explained by numerical calculations, segmented-hull model experiment and measurement on actual ships. The authers point out that special consideration should be paid on low speed, at the neighbourfood of sincronized condition of ship's motion in addition to high speed conditions apart from in case of small high speed craft.

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モジュールのロール・オン作業におけるバラスト調整の一考察

松下雄一, 宮園昌治

原稿種別: 本文
p. 135-152
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_135

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In the last few years, modular plant is widely accepted as construction method, especially in remote area in the world, to minimize as much as possible the quantity of work to be done at construction site, resulting to maintain quality of plant and save total cost. To obtain more merits, unit of module has tendency to be bigger in size and heavier in weight. Newly developed heavy duty transporter and module carrier make it possible to transport vast module safely, from fabrication yard to construction site. One of important and tense work in transportation of module, is roll-on/off it on and from the vessel. In this papers, we will explain details of roll-on/off operation based on our experiences, and introduce simple approximation about quantity of ballast and so on, necessary when roll-on/off is carried out.

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大型高速旅客艇における制振材の効果に関する実船試験

木原和之, 椛田剛, 山本一雄

原稿種別: 本文
p. 153-163
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_153

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In recently years, reduction of noise and vibration has been required for all ships from viewpoint of comfortability. However, the successful reduction on high speed craft is difficult with high power engines to keep high speed. In this paper, study on effect of damping material comprised of two aluminuim plates and thin elastic interlayer for reduction of noise and vibration in high speed craft, is presented. As a step, measurements of noise and vibration on two high speed passenger craft were carried out in both cases with damping materials and without ones to confirm the effects. Furthermore, theoretical calculation were made to study on prediction of effect of damping materials. As a results, it was found that the noise and vibration in high speed craft was reduced considerably with damping materials.

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ジャッキ・アップ・リグの遷移行列法を利用した強度解析

坂田則彦, 服部陽一, 松本亙平, 高岡慎, 山越道郎

原稿種別: 本文
p. 165-186
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_165

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A new method for analyzing the strength of jack-up rigs is proposed. In this paper, we deal a platform with the plane grid structure being supported by the equivalent springs at the junction points between platform and legs and suffering the equivalent loads at the same points. The expressions for the equivalents springs and those for the equivalent loads are obtained by applying the transfer matrix method to the analysis of legs. After we have obtained the displacements of junction points, the bending moments, shearing forces, axial forces and torsional moments of line legs can be calculated at once by the transfer matrix method and then the axial force caused in each member of the actual legs can be obtained by the way shown in our previous paper. The present method has been introduced from the improvement of our previous paper and gives practically sufficient results in shorter computer time of about 1/5〜1/10 in comparison with our previous method.

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TMCP型HT50鋼板溶接継手の曲げおよび圧縮強度に関する検討

川野始, 井上好章, 矢島浩, 仁藤弘, 阪井大輔, 十河泰雄, 佐藤邦彦, 豊田政男

原稿種別: 本文
p. 187-198
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_187

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Recently Thermo-Mechanical Control Process steels, that is TMCP steels, have begun to pervade as ship hull materials. TMCP steel plate, that have less carbon equivalent (Ceq.), is generally superior to conventional steel with same strength level in respect to weld cracking property, joint toughness etc.. And selection of these steels also seems to be promoted by a strong demand of ship owners and shipbuilders on hull weight saving and fabrication efficiency improvement. So that, hereafter, it seems that these steels are increasing more and more in ship and off-shore structure building. TMCP steel joints, however, subject to large heat input which is desirable from fabricating efficient point of view are apt to have soft heat affected zone (soft HAZ) which might weaken joint strength. In these circumstences, the authors have investigated the effect of soft HAZ on several kinds of strength characteristics essential to structural design. And in this report, bending and compressive strength of TMCP type HT50 steel welded joints are shown. Especially, following four items are considered. 1. Effect on collapse load by a plastic analysis in which hinge mechanism is considered. 2. Estimate of allowable soft HAZ to maintion load-carring capability in bending. 3. Effect on buckling stress as an eigen value. 4. Effect on ultimate strength in compression. And those were conducted 4 point bend test using TMCP type HT50 welded joints whose Ceq. are 0.25% and 0.32%, and several kinds of numerical analyses. As a result of this study, it has shown that the degraded bending strength by soft HAZ would be compensable by careful consideration on the work hardening of the material and the drop of compressive strength due to the soft HAZ would be rather small in contrast with some other factors such as initial deflections.

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溶接継手部の疲労き裂伝播シミュレーション解析

後川理

原稿種別: 本文
p. 199-208
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_199

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Recently, the fatigue design taking stress concentration due to welding bead into account have been applied to LNG carriers and offshore structures. In case of adopting this design criteria, the deviation of stress concentration factor at weld toe plays an important role. And the deviation of this stress concentration factor is usually larger than that of fatigue fracture life. This is because that fatigue crack propagation life does not largely deviate by the irregularity of stress concentration factor due to welding bead. Generally, on the fracture mechanics approach for fatigue crack propagation, a simple calculation model of stress intensity factor is used, and the fatigue strength is calculated by deterministic approach. The approach of this paper is as follows; Applying of probabilistic approach (Monte Carlo method) for fracture mechanics, the fatigue crack propagation behavior of multi-cracks under irregular stress field of welded joints is numerically simulated. Using this developed computer simulating system, the fatigue tests of welded joints can be numerically carried out. As the results of numerical fatigue tests for non-load-carrying fillet welded joints of aluminum alloy. 5083-O, the following conclusions are obtained. a) The fatigue lives by numerical analysis are in approximate agreement with experimental data. In this analysis, the practical statistical parameters from measured weld bead shape data to calculate stress concentration factor, the available experimental data of fatigue crack initiation life for smooth specimens and available material constants are used. b) Though the calculated deviation of fatigue crack initiation life is comparatively large, the standard deviations of fatigue fracture life are small as 0.064-0.101. These values are almost same as experimental data of 0.07. c) Comparing to conventional fatigue crack propagation approach with assumption of calculating model of single crack under uniform stress field, this approach can reasonably simulate the fatigue behavior of multi-cracks at each stage of crack initiation, crack propagation and crack coalescence. The fatigue crack coalescence make fatigue crack propagation life shorten.

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新制御圧延鋼の疲労強度におよぼすセパレーション発生量の影響と評価

勝田順一, 中島正樹, 出口明雄, 多田益男, 矢島浩, 束田幸四郎

原稿種別: 本文
p. 209-220
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_209

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Our previous paper made it clear that the brittle crack propagation-arrest characteristic of TMCP steel plate would be enhanced with the increase in its maximum separation index (SI_<max>). However, in order to successfully utilize the TMCP steel plate which are prone to the separation, it is necessary to investigate the effect of the separation on the strength of large welded structures. A study therefore was performed with an emphasis on evaluateing the effect of the separation on the fatigue strength of TMCP steel plate, with the results as encapsulated in the following. (1) The fatigue life tends to increase with the separation index. (2) The fatigue strength is influenced by the angle between progressing direction of fatigue crack and ferrite-pearlite layer. (3) The effect of the separation on the fatigue strength in the direction of plate thickness is not recognizable. (4) At low temperatures, the bending fatigue strength of TMCP steel plate is nearly equal to that of conventional steel plate.

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デルタ列関数を用いた相変化を含む熱拡散問題の解析法

福地信義

原稿種別: 本文
p. 221-231
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_221

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About 10 percent of the crude oil imported into Japan is high pour point oil which tends to be solidified at a normal temperature. The oil tankers carrying high pour point crude oil are almost equiped with the tank heating system composed of meandering steam pipe to make easy cargo oil handling by keeping fluidity. However, the accidents of oil solidification occasionally occur during pumping up cargo oil for the sake of inadequate oil heating system or unskillful pump operation. In this case, the heat energy of steam in heating coil is transfered to crude oil in solid state for fusion. In order to investigate the heat transfer with moving boundary of solid and liquid phase, so-called Stefan problem, the method of numerical analysis by the finite element method with fixed mesh is proposed in which the enthalpy in heat transfer equation is expressed continuously by using the function of delta-sequence at interface of both phases. This analytical method has a characteristic that a fairly large margin of discretization errors caused by the interface element located at phase boundary will be introduced during solving the simultaneous equations on heat transfer. But the errors due to interface element are decreased by means of dividing into fine mesh of domain about twice or three times than usual. The spreaded melting zone, the oil temperature and flow velocity in liquid phase are calculated about two examinable models and two tank bottom models for judging the justice of analytical method.

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外気温度及び大気圧力変化によるLNG蒸発量の変動予測(その1)

古林義弘, 遠藤賢

原稿種別: 本文
p. 233-239
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_233

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For the LNG carrier, the rate of LNG evaporation (hereinafter boil off rate, BOR) is settled under certain design conditions of temperature, pressure, cargo component, etc., for instance 0.25%/day, and the particulars of LNG handling equipments and the properties of tank insulation are decided accordingly. During the actual sea voyage, however, the temperature of atmosphere and sea water and the atmosphere pressure are not constant and vary with time. Thermal variation results in the change of heat gain to the tank and the pressure variation results in the distortion of equilibrium state of LNG which was stable at a saturated state, because the vapor pressure in the tank is controlled in close connection with the atmosphere pressure. These two influential factors lead to the change of LNG BOR in a short term. According to this change of BOR adjustment of LNG, gas handling machinery and the pre-estimated consumption of LNG should be modified. In this paper authors stated the theory of estimation method of LNG BOR necessary for a satisfactory operation of machinery and a more accurate estimation of LNG consumption during voyage. As a result, authors indicated that daily or hourly variation of BOR could be calculated with the knowledge of temperature and pressure in advance, and the control of BOR could be possible within a certain range. Numerical studies should be further done analyzing the empirical or actual ship data for the confirmation of the theory and the establishment of correlation coefficient.

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キャビテーションを利用した洗浄法

重富宏義, 三田糾, 北山法明, 戸村隆, 綾部久文, 国本悦夫, 横田源弘

原稿種別: 本文
p. 241-248
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_241

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Cleaning job of deposit from machinary components is of great importance in repairing work from ships. Years of experience have shown us that removing out of obstinate growth of deposit on surfaces in combution chambers in diesel engine needs manual, chemical or water jet cleaning which are costly high and less efficient. This investigation presents a unique and highly efficient cleaning machine introducing the characteristic of cavitation effect with high speed spray in water through substantial operational tests in the model machine.

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西部造船会技術研究会経過報告

原稿種別: 付録等
p. 249-253
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_249

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CONTENTS

原稿種別: 目次
p. Toc2-
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_Toc2

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奥付

原稿種別: 目次
p. Toc3-
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_Toc3

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裏表紙

原稿種別: 表紙
p. Cover2-
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_Cover2

会議録・要旨集フリー

PDF形式でダウンロード (66K)
CONTENTS

原稿種別: 表紙
p. Cover3-
発行日: 1985/08/24
公開日: 2018/02/25

DOIhttps://doi.org/10.14856/wjsna.70.0_Cover3

会議録・要旨集フリー

PDF形式でダウンロード (66K)

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