西部造船会々報

表紙

原稿種別: 表紙
p. Cover1-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_Cover1

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目次

原稿種別: 表紙
p. Cover2-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_Cover2

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西部造船会役員

原稿種別: 付録等
p. App1-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_App1

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西部造船会編集委員

原稿種別: 付録等
p. App2-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_App2

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本会記事

原稿種別: 付録等
p. i-v
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_i

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超高速域におけるRankine Source法について

安東潤, 片岡克己, 中武一明

原稿種別: 本文
p. 1-10
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_1

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Conventional Rankine Source Method (Normal Method) uses the double model flow as the basic flow. In this paper, we propose another Rankine Source method (Inverse Method) which uses the inverse image flow as the basic flow in the high speed range. The linearized wavemaking resistance theory is available at an arbitrary high speed. We show that Normal Method gives quite different wave profile from the analytical one in the high speed range, while Inverse Method does the same wave profile as the analytical one. As an example, we calculate the wave profile and the wavemaking resistance of a point doublet, a circular cylinder and a 2-D hydrofoil using Normal Method and Inverse Method in the wide range of speed.

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Hydrodynamic Analysis of a Ducted Propeller in Steady Flow Using a Surface Panel Method

川北千春

原稿種別: 本文
p. 11-22
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_11

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A surface panel method to analyze the hydrodynamic properties of a ducted propeller operating in uniform flow is described. The present method solves the problem of an impeller and a duct simultaneously. It is an extension of the potential-based low-order surface panel method for the analysis of open propellers developed by Hoshino. Further, a new wake model for the trailing vortex wake of the ducted propeller is proposed, based on the accurate measurement of flow field by a 3-component Laser Doppler Velocimeter(LDV). The present method can predict the pressure distribution over ducted propeller in detail. And the open-water characteristics of a ducted propeller calculated by the present method show a better agreement with experimental data.

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QCMによる非定常プロペラ性能の実用的計算法

村上光功, 黒井昌明, 安東潤, 中武一明

原稿種別: 本文
p. 23-36
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_23

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This paper presents a practical Quasi-Continuous Method (QCM) to estimate the unsteady characteristics of propeller in a wake based on the modified QCM proposed in the previous paper. Taking into consideration the effect of shed vortex system in addition to bound and trailing vortex system, we obtain the strength of bound vortex distribution and then calculate the unsteady thrust and torque of propeller. As to the pressure distribution on the propeller blade, we newly introduce the concept of unsteadily equivalent 2-D wing and then we calculate the pressure distribution making use of Moriya's method. At first, we apply our method to Wagner problem and next to a conventional propeller (CP) and a highly-skewed propeller (HSP) which were fitted to the training ship "Seiun Maru". Comparing with other numerical and experimental results, we confirm the usefulness of this method.

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プロペラ後方の舵角を有する舵に働く力について

玉島正裕, 楊晨俊, 山崎隆介

原稿種別: 本文
p. 37-48
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_37

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In the previous report, the authors described the calculated results of the flow around a rudder with rudder angle behind a propeller in uniform flow, applying the simplified propeller theory of the infinite number of propeller blades to propeller and the panel method to rudder. The calculated results were compared with the existing measured velocity and pressure distribution. The good agreement of calculated results with measured one were obtaind within the range of rudder angle of 20°. In this report, the forces calculated using the same method as previous one with improvements a little, acting on rudder with rudder angle, and the interaction between propeller and rudder are mainly discussed, comparing with the experimental results over the range of larger rudder angle as harbor use. The calculated results of forces acting on rudder with rudder angle and of effects of rudder angle on propeller performance show good agreement with the experiments within the rudder angle by 20°. More than 30° rudder angle, the tendency of calculated drag and moment acting on rudder is different from that of measurements. It is considered that this is due to different pressure distribution on rudder in between calculation and experiment. Some improvements of calculation method in the large rudder angle behind propeller are necessary, applying a method like massive separation flow model.

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特殊舵の性能推定に関する研究

小瀬邦治, 細川護久, 山田秀光, 秋藤研二

原稿種別: 本文
p. 49-57
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_49

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To improve maneuvering capability of ships in harbors, widely equipped are special rudders, such as flap rudder, shilling rudder and so on. In the circulating water tank of Hiroshima university, detailed model tests were carried out for measuring hydrodynamic performance of the rudders in open water and also behind a propeller. Both effects of helm angle and drifting angle on the propeller and rudders performance were examined. The mathematical model of so-called MMG type is exployed for describing the measured performance of the propeller and rudders and the parameters for the tested rudders are shown. The rudder's performance in lager angle in helm and drift is also discussed from the viewpoint of maneuvering in harbors.

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Hydrodynamic Interactions among Hull, Rudder and Propeller of a Turning Thin Ship

安川宏紀

原稿種別: 本文
p. 59-83
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_59

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A method was developed to calculate the hydrodynamic forces acting on a turning ship taking the interaction effects among hull, rudder and propeller into account. The lifting surface theory for expressing the hull and rudder, and the simple sink propeller model are adopted under the assumption of the thin ship. A wake vortex model of a turning ship was proposed for accurate evaluation of the hydrodynamic forces. Calculations were made of the hydrodynamic forces acting on the turning and obliquely moving ship with steering by use of the present method. And the following interaction effects among the hull, rudder and propeller were investigated theoretically: (1) propeller effect on hydrodynamic derivatives of ship hull, (2) propeller effect on hull-rudder interaction coefficients, (3) effect of turning motions on hull-rudder interaction coefficients, (4) effect of turning motions on thrust deduction factor. As a result, it was found that the present method is useful for a better understanding of the hydrodynamic interactions among the hull, rudder and propeller for the turning ship.

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浅水域における曳船・被曳船系の針路安定性

貴島勝郎, 前川和義, 田中浩一郎

原稿種別: 本文
p. 85-96
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_85

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The directional stability of tow and towed vessels is very important factor in the scope of marine safety, especially in bay and canal. It is well-known that the directional stability of those vessels will be also affected by the water depth. In general, much longer towing rope is used for improvement of the directional stability on vessel that has poor stability. However, it is difficult to apply such the way in bay and canal overcrowded by many vessels because the total length of tow and towed vessels system is limited in such area. In course changing motion, a deviation is taken between trajectories of tow and towed vessels, and the trajectory of the vessels in shallow water differs from that in deep water. In this paper, we discuss the effect of water depth, length of towing rope and current on the directional stability of the system by numerical simulations. From the simulations, we got the concluding remarks as follows. (1) The directional stability of tow and towed vessels will be affected so much by the water depth comparing with the effect of the towing rope length. Therefore, it will be needed to consider the influence of water depth for tow and towed vessels system. (2) The course of the system is changed by the influence of current, and vessels take much deviation between trajectories of tow and towed vessels especially in against current.

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船の操縦特性に及ぼす載荷状態および水深の影響に関する一考察

貴島勝郎, 田中進, 前川和義, 堀龍明

原稿種別: 本文
p. 97-106
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_97

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It is considered that a loading condition and water depth are important parameters for the prediction of ship manoeuvrability at the initial design stage. For the prediction of ship manoeuvrability with high accuracy, it will be required to estimate the hydrodynamic forces acting on ship accurately in any conditions. At the first, the hydrodynamic forces acting on ship in deep and shallow waters with parameter of loading condition are shown by using of the proposed prediction method from viewpoint of practical design. In the second, the manoeuvring characteristics of a ship in any loading condition are discussed with the effect of water depth. At the last, the manoeuvring performances of full scale ships are discussed and compared with the sea trial results in deep water.

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船の転覆限界のフラクタル性に及ぼす復原力変動の影響

田口晴邦, 菅信

原稿種別: 本文
p. 107-120
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_107

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The stability of a ship travelling in following or quartering seas varies with the relative position of the ship to the wave. In general, it is decreased when the wave crest is amidship and increased when the wave trough is amidship. If we use a polynomial with a linear term and a cubic term in rolling angle φ to fit the stability curve in still water, there are two simple expressions for such stability variation. One is an expression that all terms of the polynomial are varied with an encounter period, and another is only the linear term of the polynomial is varied. In this paper, we call the former N type variation and the latter L type one. In both cases the single-degree-of-freedom equation of motion for roll results in a forced Mathieu type capsize equation. In the previous paper, on the basis of the nonlinear dynamical systems theory the authors studied numerically the forced Mathieu type capsize equation with the N type stability variation. It was clarified that there were many different characteristics from the non-Mathieu type capsize equation without stability variation in phenomena such as bifurcation diagrams, metamorphoses of safe basin in the initial value plane and fractal-like capsize boundaries in the control parameter plane. In this paper, in order to clarify the difference between the two expressions for stability variation, we have carried out similar numerical studies for the L type forced Mathieu capsize equation and compared with the result of the N type. It is showed that although for the same magnitude of the stability variation, the result for the L type variation is more dangerous for capsizing than that for the N type, yet the difference between the two types is not essential. And some examples of super-subharmonics rolling in the fourth and fifth unstable regions and bifurcation diagrams with the slowly varied forcing frequency are also illustrated. By these numerical studies the totality of the global and local characteristics of the solution of the forced Mathieu type capsize equation has been more clarifed.

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外乱下における浮体構造物の定点保持について(続報)

貴島勝郎, 古川芳孝

原稿種別: 本文
p. 121-129
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_121

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Dynamic Positioning Systems (DPS) are used in offshore platforms to keep their positional stability in deep waters where the use of conventional mooring systems is generally not available. An offshore platform controlled by a DPS is usually under the influence of several unsteady external forces whereby it becomes essential to have a sufficiently detailed knowledge of its responses under such forces. In the previous paper, we examined the motion of an offshore platform under the unsteady external forces such as ocean currents and wind. Furthermore, we compared the performance of a control system for DPS that employs the linear optimal regulator control theory with that of the PID control system. The thrusters of the DPS produce an inherent time lag between the actuation and the final response that thrusters produce required control forces. This time lag is caused mainly due to two reasons. The first one is that required power output can't be gotten rapidly and the second reason is the inherent limitation in the angular velocity of the rotatable thrusters. Thus, here we take into account of the time lag in the thruster response to evaluate the performance of the control system for DPS. As the result of numerical simulations, we obtained the following conclusion. The rate of change of the thruster power output, the first one of the two reasons mentioned above, is found to have a nearly dominating influence on the total performance of the control system as compared to the other factor.

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剥離渦層を流出しながら任意運動をしている物体に働く流体力

野中晃二

原稿種別: 本文
p. 131-141
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_131

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The purpose of this paper is to show exact expressions of hydrodynamic forces and moments acting on a moving body with separating thin vortex layers, in a form of velocity potential integral, and to show accuracy and validity of slender body approximate expressions by deducing them from exact expressions. Prediction of hydrodynamic forces and moments acting on a body is one of important research themes in hydrodynamics, and we want exact and simple expressions of hydrodynamic forces and moments, which are easy to calculate and convenient to understand flow field phenomena. In a hydrodynamic research on a ship manoeuvring motion, we often use a simple flow model in which separation flow is approximated by thin free vortex layers. In this kind of lifting potential flow problems, there are several cases in which calculation of hydrodynamic forces from velocity potential itself is more convenient than calculation them from pressure distribution. Under these considerations, I examined three dimensional lifting potential flow subjects, and got following results. First, exact and simple expressions of hydrodynamic forces and moments in a three dimensional lifting potential flow were obtained. These expressions are the same forms as ones in nonlifting potential flow, if separation vortex sheets are excluded from velocity potential integral area. Second, after a long time arbitrary motion of a body, it is practically impossible to calculate hydrodynamic forces and moments by use of above obtained exact and simple expressions. So, more practical expressions appropriate to such cases were obtained. Third, applying these exact and practical expressions to gentle or small motions around a constant advancing motion of a slender body, approximate expressions were obtained. This analyzing process shows that usually used approximate expressions of lift and moment in a slender body theory are correct to second order and are exact for some special cases. Finally, we often use up-and-down symmetric flow model between two parallel planes, in hydrodynamic research of shallow water effect to a ship manoeuvring motion. It was shown that the above obtained expressions of hydrodynamic forces and moments acting on a moving body can be applied to this shallow water problem in the same form as ones in an unbounded fluid region.

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風力補助推進装置(ウィングセール)の試設計と性能解析(続)

新開明二, 瀧本努, 江熊寿典

原稿種別: 本文
p. 143-152
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_143

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This report deals with detailed analysis of aero-dynamic characteristic of a new windpropulsion assisted-apparatus which has been presented in the former report. The new propulsion assisted-apparatus (the Compositive Wing Sails) is twin sail systems which consist of two or three wing sails (Main sail, Flap, Slat) twin. Aero-dynamic characteristic of the apparatus are examined in detail by using the numerical method based upon the Vortex Distribution Method. A series of numerical calculations are executed for a variety of combinations with main sail, flap and slat. And its performance of the ship fitted with one set of the Composititve Wing Sails is estimated under varying condition of wind. It is confirmed that the apparatus is a useful device for saving the propulsion power of a ship.

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有限差分法を用いた数値実験による動揺軽減タンクの特性解析

山口悟, 新開明二

原稿種別: 本文
p. 153-162
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_153

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This paper deals with fluid dynamic analysis of liquid in tanks in preparation for studies of stabilization of ship rolling motion by an activated anti-rolling tank which is equipped with impellers on the channel's center of tank. Fluid dynamic motion in the tank is analyzed based on a numerical simulation, and the transient response and the frequency characteristics of liquid in tanks are investigated to design a tank control system. The computer program for the numerical calculations is newly remade on the basis of the SOLA-SURF scheme. Sveral problems of numerical calculations for fluid dynamic motion in activated anti-rolling tanks are discussed. And, a series of numerical computations are executed for three anti-rolling tanks by using the newly remade computer program, and effects of tank shape upon the transient response and the frequency characteristics of anti-rolling tanks are shown in detail.

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C言語による設計支援エキスパートシステムに関する基礎的研究 : ボックスガーダの最適設計を題材にして

北村充, 信川寿, 窪田学

原稿種別: 本文
p. 163-169
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_163

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An object oriented base expert system aiding structural design is studied in this paper. Since a structural design needs large computational efforts, an expert shell written by C language is proposed here. In order to have interence capability in the system, we preferred introducing a sensivity analysis rather than production system. Since the expert shell is completely made by C language, this sensitivity can be computed within reasonable time. Sensitivity analysis gives us an guide line to update design variables resulting in improving an objective function. In order to see the preformance of the proposed expert shell, we created an expert system for structual design of a box girder. The system worked well such that we obtained 12% of reduction in its weight which is an objective function for this design problem.

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Elastoplastic Reanalysis of Plane Truss Applying Repeated Sensitivity Analysis

M.Abdul Rahim, Kouichi Taniguchi, Masahiko Fujikubo, Tetsuya Yao

原稿種別: 本文
p. 171-180
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_171

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Elastoplastic reanalysis of plane truss structures is performed applying the repeated sensitivity analysis procedure considering the element cross-sectional area as design variable. Both structural and sensitivity analyses are performed using the incremental finite element method, and structural reanalysis is performed using the Taylor series expansion method considering up to the third-order sensitivities. The characteristics of elastoplastic reanalysis solution, the application of repeated sensitivity analysis procedure, and the accuracy of the reanalysis method using the Taylor series expansion are examined on plane truss structures. A five-bar and a twenty-eight-bar trusses are considered for analyses. Ill-conditioning that is likely to occur in the estimation of the allowable change in design variable, and the requirement and magnitude of limits on design change are discussed.

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パネルフラッターに関する基礎的研究

安澤幸隆, 大高勝夫, 山口高典

原稿種別: 本文
p. 181-193
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_181

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The dynamic instability of a rectangular plate in contact with rapidly flowing incompressible fluid has been studied, for the purpose of examining the possibility of panel flutter in such a high speed ship as Techno Super Liner currently under development in Japan. In addition to the bending, membrane stress is taken into account in the plate characteristics. Three dimensional analysis as well as two dimensional one for the fluid was carried out. The following results were obtained: (1) Divergence can take place at the speed slightly lower than the flutter speed. (2) Critical speed at which instability appears is lowered by the compressive membrane stress, and (3) Possibility of instability is seen in the ship plating of practical scantlings and within attainable speed range in case of high speed ships. Some wind tunnel experiments were carried out to check the analysis.

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制振技術へのファジィ理論の適用に関する研究(その1)

香川洸二, 山崎幸治, 柳和久

原稿種別: 本文
p. 195-208
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_195

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Active control systems based on a modern linear control theory were studied in a field of ship vibration as well as other engineerings. It is difficult, however, to get a satisfactory effect of control in the case of characteristics of vibration system isn't clear or alters largely. On the other hand many kinds of process control systems made use of fuzzy control theory. The fuzzy control theory applies fuzzy theory and intelligence engineering to the plant process control without mathematical model. In this paper as the first step the authers try to apply the fuzzy control to the vibration of structure simulated by a vibration sysytem of 1D.O.F, and examine the features and the adaptability of fuzzy control to the vibration control. The conclusions are as follows (1) It is comfirmed that fuzzy control can be applied to vibration control without mathematical model. (2) The influence of some membership functions and fuzzy rules is clarified. (3) Fuzzy control of the vibration system is available to some types of non-linear feedback gain. (4) The effect of fuzzy control is nearly equal to that of optimal control in the case of impulsive excitation.

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小型動吸振器の開発

伊藤護, 野田伸

原稿種別: 本文
p. 209-218
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_209

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This paper presents the development of a small-size dynamic damper to reduce the vibration of main fittings and local structure on ships. The authors manufactured the passive mass damper which consists of plate spring with sliding support and removable viscous-damper, and confirmed the vibration characteristics by the experiment using test structure and exciter. Then they were applied to actual fittings of ship to verify the efficiencies. The conclusions obtained are as follows. (1) The required specifications as a damper for the fittings and local structure of ship were cleared. (2) The performance of newly developed passive type dynamic damper was confirmed to satisfy the required specification by the experiment using test structure and exciter. (3) From the experiments of the ships, it was confirmed that the vibration of funnel was reduced to about 1/2.9 by fitting the dynamic damper without viscous-damper and the vibration of supprort-structure for cell guides was reduced to about 1/5.5 by fitting the dynamic damper with viscous-damper.

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外部電源法による陰極防食下の塗装鋼板における過防食域について

岩田光正, 黄一, 藤本由紀夫

原稿種別: 本文
p. 219-225
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_219

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In the impressed-current method used for cathodic protection of ship hull, the overprotection field around the anode reaches 40〜50m^2, because the electric current of a few tens of ampere is supplied from one anode. Thereupon, the insulated coatings of 2〜8 times of the thickness in comparison with other portion on ship hull surface should be applied to this region. In the numerical analysis of a electric field in the cathodic protection by impressed-current method, the scope of the insulated resigons requared for avioding overprotection around anodes must be given as input data. In this paper, the estimation formula giving areas of the insulated resigons based on the shape of the protected body and the anticipated protection electric current was established. Although the insulated area has been empirially obtained in practice, this formurization may be very useful for the automatical optimization of the impressed-current cathodic protection system with aid of computer.

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快適な海域環境を創る流況制御技術 : ミチゲーションプランを実現する海域環境創造技術

上嶋英機

原稿種別: 本文
p. 227-232
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_227

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Trial Analysis for Semi-Submerged Catamaran (SWATH) "Ohtori" Based on 1978 ITTC Performance Prediction Method

Kinya Tamura

原稿種別: 本文
p. 233-237
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_233

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Lift Based Propeller Scale Effect and Its Influence On Propulsive Characteristics of Ships

Jan Szantyr

原稿種別: 本文
p. 239-246
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_239

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The paper presents computational analysis of the lift based propeller scale effect corrections and their influence on propulsive characteristics of ships. The analysis is performed for three single screw cargo vessels of different size. Resulting propulsive characteristics of ships and ship trials prognoses are presented, compared with sea trials results and discussed.

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会告

原稿種別: 付録等
p. 247-249
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_247

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複写をされる方に

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p. 250-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_250_1

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Notice about photocopying

原稿種別: 付録等
p. 250-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_250_2

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会告

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p. 251-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_251

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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. 253-257
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_253

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平成5年度春季講演会論文募集要領

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p. App3-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_App3

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奥付

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p. App4-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_App4

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CONTENTS

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p. Toc1-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_Toc1

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裏表紙

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p. Cover3-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_Cover3

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CONTENTS

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p. Cover4-
発行日: 1992/09/04
公開日: 2018/03/01

DOIhttps://doi.org/10.14856/wjsna.84.0_Cover4

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