日本船舶海洋工学会論文集
Online ISSN : 1881-1760
Print ISSN : 1880-3717
ISSN-L : 1880-3717
11 巻
選択された号の論文の26件中1~26を表示しています
  • 平松 拓郎, 高木 健, 興梠 有人
    2010 年 11 巻 p. 1-6
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Resistance test and oblique towing test in a towing tank with a 1/100 scale model of VLMOS for investigating the effect of interaction among the many struts or between lower hull and struts has been carried out. Experiment to test the stability of course keeping in which we imitate the wind drag force and sail force by adding external forces and the navigation performance of the structure with model sails have also been carried out. Finally we performed navigation simulation using maneuverability coefficient with interaction. These results show that the structure has enough performance of the navigation, although the interaction effect due to vortex occurring at the rear part of strut is not negligible.
  • 陸田 秀実, 栗原 健治, 黒川 剛幸, Suandar Baso, 土井 康明, 施 建剛
    2010 年 11 巻 p. 7-16
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    We have developed an efficient and robust CFD method to compute a strongly nonlinear interaction between wave and ship,such as heave and pitch motions in a severe wave condition, resultant slamming on the surface of a ship and an impact pressure due to green-water phenomena. The proposed method is based on coupling the Eulerian method for fluid phase with the Lagrangian method for solid phase to compute fluid-structure interaction. In this model, two kinds of Lagrangian particles are employed. One is free surface particle located near the free surface to capture a water surface accurately. The other one is SPH particle to compute ship motions in 3D. A fully nonlinear phenomenon with wave breaking is treated on a fixed Eulerian grid with the free surface particles to rebuild density function for capturing an interface between two phases in a filamentary under resolved region. In this study, the proposed model was applied to ship-wave interaction for evaluating of seakeeping of a ship in waves and their results were compared with experimental results and strip theory.
  • -バラスト状態への適用-
    金井 健
    2010 年 11 巻 p. 17-27
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    The neural net work has been actively used in the various fields of technology as an effective tool of non-linear approximation technique. In the previous paper, authors showed that the neural net work could estimate propulsive performance in good accuracy for full load condition of some fine ships. In the present study, author shows the results of the relation between the ship form parameters and propulsive performance investigated with the neural net work by use of 3200 cases of model test results collected from the existing data base. As the results it was shown that propulsive performance of various type of single screw displacement ships in both full load and ballast condition with trim can be estimated in good accuracy.
  • 蓮池 伸宏, 山崎 正三郎, 安東 潤
    2010 年 11 巻 p. 29-40
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Marine propellers are operating in the unsteady ship wake flow, which causes the repeat of cavitation occurrence and disappearance. Such cavitation causes the serious vibration and erosion problems. Therefore, the decrease of the erosion risk is one of the very important issues in the propeller design. Especially, latest propeller design for high efficiency is based on detail estimation of cavitation performance. It is necessary to estimate the process of cavitation disappearance related to both blade cavitation and tip vortex cavitation near the very local tip region for the evaluation of the erosion risk.Recently, RANS method becomes the common useful design tool for the analysis of the flow field around marine propellers, and the application to the cavitation simulation is highly expected. It is thought that it becomes an effective method for the evaluation of the erosion risk, if it may simulate the blade cavitation and the tip vortex cavitation in detail.First of all, numerical simulation of the tip vortex of the DTMB P4119 propeller in non-cavitating condition was performed in order to examine the effectiveness of the adaptive mesh generation. Numerical results of flow field behind the propeller were compared with LDV measurement results.Finally, the cavitation simulation including tip vortex for Seiun Maru .I propellers was performed by and the cavitation patterns were compared with the experiments.
  • 新里 英幸, 永田 修一, 豊田 和隆, 島崎 克教
    2010 年 11 巻 p. 41-50
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Many analytical methods have been proposed to calculate hydroelastic responses of a very large pontoon type structure in waves.In relation to the elastic response of such pontoon type structure in waves, Isshiki and Nagata proposed the "Modified Hamilton-Dirichlet's Principle 2", which is expressed only using the velocity potential. It is the variational principles related to motions of the elastic floating plate on a water surface.In this study, in order to calculate the wave-induced responses of an elastic floating plate in waves, a new method was proposed which uses the "Modified Hamilton-Dirichlet's Principle 2"and the eigenfunction expansion method for fluid motion. The velocity potentials in fluid regions with and without the plate are expanded by eigenfunctions in vertical mode which satisfy the governing equations and free-surface conditions, taking into account the presence of the plate in the same manner as Kim and Ertekin. In this method, "Modified Hamilton-Dirichlet's Principle 2" is finally reduced to a variational equation which corresponds to boundary conditions on the plate's edge. The formulation of proposed method is applicable for the floating plate of arbitrary plan geometry.Calculated results of two kinds of rectangular and L-shaped floating plate in an open sea are compared with experimental results.Good agreement is found between computed and experimental results.
  • 鈴木 啓介, 佐久間 俊
    2010 年 11 巻 p. 51-59
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    When a high speed vessel is designed, it is important how we make her sectional area curve effectively on purpose to minimize the hull resistance. But on a sectional area curve, there are, in general, some constraints caused by the requirement of ship arrangement and we cannot reject them simply because we must build not only a small resistance ship but also an easily operable ship. A sectional area curve under these constraints is usually made from the experience of designers by referring one of a type ship, but we don't think we can get a true optimal curve easily only by the experience.In this report, we introduce the linear wave-making resistance theory into the optimal problem and Series 64 model 4793 is chosen as the object for analysis. The sectional area curve of Series 64 model 4793 is expanded into Mathieu function series and the performance is evaluated from the viewpoint of the wave-making resistance. Then we make the optimal curve for the improved hull form theoretically using calculus of variation under some constraints which are established artificially by us.Finally, we carry out resistance experiment of the improved hull form to evaluate our optimal method and it shows good result that the residual resistance of improved hull form becomes around the half of that of the original hull form.
  • -実験水槽における実証実験-
    平川 嘉昭, 平山 次清, 高山 武彦
    2010 年 11 巻 p. 61-71
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
  • 前川 和也, 二瓶 泰範, 片山 徹, 池田 良穂
    2010 年 11 巻 p. 73-79
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Since catamarans can reduce wave-making resistance by making the hulls slender, the ships can be easily speed up at high-speed.However, high-speed catamarans are significantly affected by the sea state because of its light structures and high cruising speed.Therefore, it can be said that it is important for high-speed catamarans to know the seakeeping performances of the ship preliminary design stage. Although linear strip methods are widely used to estimate seakeeping performances of ships, it is thought that those prediction methods are not in work for high-speed catamarans because the ships have unique hull shapes and high forward speed.In the present study, since it was found that ship motions of the high-speed catamarans which operated in waves were significantly influenced by hydrodynamic lift force acting on hulls especially in high advanced speed, a prediction method for wave-induced ship motions, which includes hydrodynamic forces originated from lift force, was developed. The comparison between the predicted and experimental results demonstrates that the proposed method has enough accuracy for estimating ship motions in head seas.
  • 児玉 良明, 日野 孝則, 右近 良孝, 日夏 宗彦
    2010 年 11 巻 p. 81-89
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    The validity of CFD for flows around a ship model under strong wall effect has been tested using a SURF code developed by NMRI,computing cases in which a 6m-long full hull form is installed in the cavitation tunnel of NMRI, and comparing measured and computed wake distributions at the propeller plane. In the experiment where no flow liners were installed in the cavitation tunnel,the wake distribution became thick and strong asymmetry has occurred. In cases where flow liners were installed near the hull stern,the asymmetry in the wake distribution has disappeared and the distribution became thinner than that obtained in the towing tank. In the computation of no flow liner cases, in which only a half side was computed by assuming symmetry, the thickening of the stern boundary layer has been well simulated. In the computation with flow liners the thinning of the stern boundary layer has been well simulated, and good agreement between measurement and computation in the propeller wake has been obtained. The computed propeller wake changed according to small changes in the streamwise location of the flow liners. Thus CFD for flows under strong wall effect has been validated. Also the change in the solution convergence/oscillation behavior due to changes in the pseudo-compressibility and local Courant number parameters for the flow under strong wall effect has been discussed.
  • 前川 和也, 二瓶 泰範, 桃木 勉, 松田 秋彦, 池田 良穂
    2010 年 11 巻 p. 91-99
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Since wave-piercing catamarans were developed based on the concept to reduce wave-induced ship motions in high-speed, in Australia, the ships have special features, like two slender demi-hulls with sharp bow to reduce reserve buoyancy above the water surface, a center bow to provide reserve buoyancy in heavy waves and so on. Therefore, it is easily imagined that these features may generate nonlinearity or irregularity of ship motions in rough seas. In order to investigate the nonlinearity and the irregularity in ship motions of the ship, measurements of ship motions in various wave directions, heights and periods by using a model of the ship were carried out. The experimental results demonstrate that nonlinear features to the change in wave height appear in ship motion amplitudes in regular waves and suggest that linear ship motion theories widely used in a design stage of ship building do not work well. In shorter waves, irregular ship motions and twice period ship motions appear even in regular waves. Since the nonlinearity of ship motions is not so strong, the effect of the nonlinearity on the operation of such ships has not been pointed out as a serious problem.To investigate the cause by which the irregular ship motions appear in regular waves, ship motions were calculated by a nonlinear strip method. The results indicate that irregular ship motions of the ship were caused by drastic change of restoring force which acting on the cross deck structure of the ship.
  • 黒田 麻利子, 辻本 勝, 佐々木 紀幸, 大松 重雄, 高木 健
    2010 年 11 巻 p. 101-107
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Added resistance in waves is a predominant component for the estimation of ship speed in actual seas, so that it is necessary to be calculated accurately. The added resistance in waves is influenced by the hull form above water line. However it is difficult to take into consideration the form to the calculation theoretically. As a solution to this matter, the hybrid calculation method which combines a result of tank tests with the calculation was developed. The method includes the hull form above water line with the result of tank tests.In order to investigate the effects of the hull form above water line on the basis of the hybrid calculation method, the tank tests was carried out using three types of container ships with the different form above water line. For the expression of the effect of the hull form above water line on the added resistance in waves, a flare bluntness coefficient is installed as a parameter in the hybrid calculation method. The application for the hull form design is studied. The results of the tank tests and the calculation are compared.
  • 一ノ瀬 康雄, 辻本 勝, 枌原 直人, 柴田 和也, 高木 健
    2010 年 11 巻 p. 109-116
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    As for bulk carriers and tankers it is important to calculate added resistance in waves in a ballasted condition with accuracy,because they are operated in ballasted conditions for half of their operation time. However, it is difficult to estimate the resistance with accuracy by the numerical calculation since wave making phenomena in a ballasted condition are a complex phenomena due to emersion of the bulbous bow.In this paper, we examine the adaptability of the hybrid method to the estimation of added resistance for the ballasted condition,which is practically corrected the added resistance in waves using tank tests. The comparison between calculation and tank test are presented here. Then we investigate the effect of trim which features the ballasted condition, and the effect of draft and frequency as well. Thereafter the influence of the present method on decrease of ship speed in actual seas is evaluated by contrast that derived from the tank tests.
  • 近藤 典夫
    2010 年 11 巻 p. 117-124
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    We present numerical results for vortex-induced vibrations of a two-dimensional circular cylinder which is mounted in a uniform flow. The circular cylinder is treated as a rigid body of two degrees of freedom and is elastically supported by damper-spring systems. In this computation, we assume a low Scruton number between the circular cylinder and the fluid flow. In addition, two kinds of the Reynolds numbers, 104 and 106, are adopted for computations of the vortex-induced vibrations of the circular cylinder,and numerical results which are obtained from two kinds of the Reynolds numbers are discussed. The Navier-Stokes equations are used for computation of fluid flow and spatial discretization of the Navier-Stokes equations is performed by FEM.
  • 柴田 和也, 越塚 誠一, 酒井 幹夫, 谷澤 克治, 辻本 勝
    2010 年 11 巻 p. 125-136
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    A transparent boundary condition was developed for calculating water waves propagating to a distant area by using a particle method. In front of the boundary, the incident waves were analyzed by Fourier analysis, and the particles on the transparent boundary were forced to move to absorb the incident waves. The characteristics of this study are to introduce the technique of wave analysis used for the wave tanks to the particle simulation and to reduce the calculation cost by employing an inflow and outflow boundary. Water waves were calculated in two wave periods by the developed transparent boundary condition. As the results, it was shown that this transparent boundary transmitted the incident waves without the reflection waves. It was also shown that the calculation cost was smaller than that of the ordinary high viscosity boundary condition.
  • 二瓶 泰範, 福永 恵太, 池田 良穂
    2010 年 11 巻 p. 137-146
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    In the design of a ship, the sailing performances of the ship in waves are carefully surveyed for wide points of views, for example stability, seakeeping and so on. The results of the surveys are given to the ship as a stability booklet and other detailed documents. Navigator, however, usually operate their ships in rough seas on the basis of own skill obtained in long experience. In the real navigating situation in very severe rough seas, it is sometimes difficult for navigators to use such detailed materials mentioned above for safety navigation. Therefore, it is important and helpful to develop some tools to monitor the ship motions and seas on board automatically and to report dangerous situation to navigator.As the first stage of developing such a onboard navigating assistant system for supporting decision making of navigators, the authors proposed a simple and practical method to identify height, frequency and direction of encounter waves. This method is based on the comparison between response function database and measured ship motions. To confirm the accuracy of this method, experiments using a ferry model in tank and a real passenger/vehicle ferry operated in a Japanese domestic route are carried out in the present paper. Both of them showed a good agreement in accuracy between the obtained wave characteristics by the system and the observed ones.
  • 松倉 洋史, 角田 浩平, 大和 裕幸
    2010 年 11 巻 p. 147-155
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    To make appropriate decisions in maritime transportation systems it is necessary to consider a lot of elements like bunker fuel price, interest rates, transit port charges, optimal routes and other factors. There are various combinations of these values that it is difficult to treat the diversifications by conventional deterministic approaches. This research proposes the application of the probabilistic analysis for important and complex enterprise decision making. Inter-factory maritime transportation of a shipbuilding company between Japan and a foreign country is taken up as an example problem. The usefulness of probabilistic approach in this field is shown by demonstrating quantitative and reliable decision making analysis by decision making support system.
  • 瀬田 剛広
    2010 年 11 巻 p. 157-164
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Recently, it becomes more and more important to save fuel consumption on shipping for both economical and environmental reasons. For this purpose, there exist software-type methods like weather routing as well as hardwaretype methods like ship shape optimizing, which are very promising. In this paper, a ship scheduling optimization method, a kind of software-type method, is suggested. The method is based on mathematical programming techniques and so fast that it is appliable to maximal-fleet-sized coastal shipping scheduling problems in Japan, which seems to have been not well solvable by existing methods. A real case example shows the suggested method can optimize a 2-week scheduling of about 30 ships in 1 minuite, reducing fuel consumption by about 5 % compared to the original schedule made by human.
  • -阪神港入港船舶を対象として-
    小葉 武史, 韓 成一, 若林 伸和
    2010 年 11 巻 p. 165-171
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    This paper describes the real condition of vessel's waiting activities in offshore waters using the AIS dataset taken by Kobe university. The findings are as follows; (1) large vessels are less frequently waiting, but once they start waiting, the time of waiting is getting long, (2) vessels are waiting for the start of cargo handling at port so that they start waiting from late afternoon and exit from that status in the next morning. This paper also estimates the density function of the waiting time. Using this estimated density, the paper evaluates the effect of weather routing through the change in waiting activities.
  • 滝沢 尚士, 武市 祥司, 秋元 博路
    2010 年 11 巻 p. 173-179
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    The number of shipping services by very large container ships is decreasing in Japan because they are avoiding the inefficiency of picking cargos at distributed Japanese ports. On the other hand, China and Korea have concentrated their investment on a few large ports to create hub-spoke networks and to keep their influences on the physical distributions in East Asia region. This paper describes a container logistics simulation for designing of international container transportation networks. We discuss the economical benefit of concentrating international cargos in one or two major Japanese hub ports by evaluating the total shipping cost of shippers and shipping companies. The result shows the suitable selection of Japanese hub ports and its benefit to domestic and foreign shippers.
  • 村山 雅子, 小林 英一, 水ノ江 隆志, 近藤 英昭, 越村 俊一, 大澤 輝夫
    2010 年 11 巻 p. 181-188
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    In the near future, it is estimated that the TouNankai and Nankai huge earthquake will occurs along the Nankai Trough. The earthquake generates tsunami attack over a wide range such as Seto Inland Sea where is dotted with islets and so many ships are navigating. In addition that many ships evacuate from port areas to safe area when the tsunami attacks. Sea traffic congestion is concerned about in such the evacuation.In this study, first, we analyzed the traffic density in Bisan Seto on the basis of AIS received data. Then we carried out several kinds of preliminary simulation of ship evacuation from tsunami attack in Bisan Seto for the purpose of consideration of evacuation scenarios. An algorithm of collision avoidance by reducing propeller rotation was introduced to the ships evacuation simulation.Finally, it is found that many ships can evacuate to safer place on time when the tsunami attack in Seto inland sea in safe.
  • 柴原 正和, 旦 越雄, Yanming WU, 畝田 道雄, 正岡 孝治, 村川 英一
    2010 年 11 巻 p. 189-197
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    To achieve high efficiency and cost reduction, large heat input welding such as submerged arc welding (SAW) and metal inert gas arc welding (MIG) using large currents are employed. However, the large heat input given to the weld may produce coarse grains in the HAZ and a reduction of toughness. To avoid these problems, narrow gap welding (NGW) which is effective in reducing heat input and achieving high productivity is often employed. However, the pear-shaped bead cracking may form according to the welding condition in the case of narrow gap welding. Therefore, the welding conditions must be carefully selected to prevent the cracks.In this study, the influences of the heat input parameters, such as heat input width, heat input depth and the total amount of heat input on the pear-shaped bead crack formation under narrow gap welding are investigated using the Thermal-elastic-plastic FEM with temperature dependent interface element. Furthermore, to find the optimum values of the heat input parameters, the optimization system which can consider the formation of pear-shaped bead cracking is developed.As optimization methods, Complex Method (CM) and Genetic Algorithm (GA) are adopted. Using these methods, the ideal heat input distribution to achieve deeper penetration with small heat input and without cracking can be computed. As a result, the superiority of the welding using narrow gap can be shown in the viewpoint of heat input efficiency.
  • 孝岡 祐吉, 矢木 誠一郎, 熊本 喜, 吉川 孝男
    2010 年 11 巻 p. 199-206
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    A comparative collision study of a conventional bulbous bow and a sharp entrance angle bow structure was conducted using elasto-plastic finite element analysis to demonstrate the superior collision buffer bow characteristics of the sharp entrance angle bow structure. Further improvements that optimize the design and energy absorption of the sharp entrance angle bow structure by replacing the longitudinal stiffened steel panels of outer shells with hybrid structures composed of polyurethane elastomer cores and steel faceplates were proposed. In addition, the stem structure replaced with the hybrid structure with a polyurethane foam core was also proposed. The new structures eliminate the number of framing members to simplify construction to enhance the collision buffer characteristic of the present conventional structure.
  • - 解析法-
    野瀬 幹夫, 野崎 慎一郎
    2010 年 11 巻 p. 207-214
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    The authors are developing the simple and easy structural design system which investigates rapidly the design spiral in the stage of early design. In this system, initial scantlings and dimensions are determined through the total strength analysis system before performing FE analysis. The shear flow analysis is carried out by identifying the cross-section shape of hull girder using the number of representative points in a cross-section, the shape of closed circuits and the property of the shear flow on each member.The coefficients of the expression to shear flow distribution are automatically calculated. However, to apply this analysis to more complicated and various cross-sections within fore and aft portion of ships, it is important to develop a more generalized shear flow analysis method.In this paper, the authors propose a new shear flow analysis method using the basic concept of graph theory, where a pattern of networks is expressed by connections between points and edges, mainly applied to electric circuit network.In this first report, the authors give a concrete description for the formulation of the new analysis and the analytical procedure using a cross-section with three closed circuits.
  • 平林 紳一郎, 佐藤 徹, 渡辺 雄二, 西堀 文康, 井岡 昇
    2010 年 11 巻 p. 215-220
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Energy dissipation rate of turbulent kinetic energy was estimated by combining the time series of vertical shear measured by a moored ADCP and numerical simulations. The ADCP was moored at the depth of 2000 m off Joban coast and vertical profiles of velocity were measured for 3 days. The extracted vertical shears were used as time-varying forcing components in LES to reproduce turbulent.eddies Energy dissipation rates obtained from the simulated flow field were in good agreement with those estimated by a conventional model using 10-m shear components. Vertical diffusivity was calculated by simulating the diffusion of dye in the reproduced flow field by LES. Mixing efficiency estimated by comparing the direct and indirect estimates of vertical diffusivities from the results of LES becomes 0.51, which is 2.5 times larger than its upper bound It is found that temporarily large dissipation enhances mean vertical diffusivity, indicating that consideration of temporal variation of flow field is necessary.
  • 吉本 治樹, 多部田 茂, 白田 慶一郎
    2010 年 11 巻 p. 221-227
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Artificial upwelling is a technology aiming to increase the marine productivity by uplifting bottom seawater with rich nutrient to euphotic zone using artificial structure. The environmental impacts of an artificial upwelling technology using a seabed mound is inclusively assessed by using the Triple I (III: Inclusive Impact Index). Triple I is calculated based on ecological footprint (EF),biocapacity, ecological risk, human risk, cost, and benefit. In the calculation of EF, environmental impacts due to CO2 emission is estimated using input-output analysis considering indirect effects through the whole economy, which could be several times larger than the direct effects. It is also found that increase of biocapacity due to the enhancement of primary production will much greater than EF increase due to the construction of seabed mound. The value of III could significantly affected by the parameter γ which converts economic value (cost or benefit) to environmental value (EF). Based on a detail consideration about the parameter , a new method to calculate γ was proposed in which marginal abatement costs of CO2 emission and GDP produced by each industrial categories are utilized. III with proposed γ indicates that the artificial upwelling technology will be sustainable when the indirect effect is considered.
  • -既存船舶情報に基づいた構造最適設計-
    中森 隆一, 北村 充, 濱田 邦裕
    2010 年 11 巻 p. 229-238
    発行日: 2010年
    公開日: 2011/01/28
    ジャーナル フリー
    Usually, the design of the hull structure is held after the principal particulars represented by the length, width and depth of a ship and the arrangement of holds and ballast tanks are decided. At this time, the scantling of the longitudinal stiffeners and their space and the thickness of the plate are left as design variables in the optimization of the hull structure. There is a possibility to get a more suitable plan if the dimensions of the compartment are given as design variables in the design of the hull structure. Hence, an optimal design of midship section with rearrangement of compartment is investigated here.Furthermore, when the building cost of the hull is classified roughly in the material cost and the assembling cost, these costs are influenced by the age and surrounded environment even though the same vessel is constructed. For example, the assembling cost is influenced by change of the construction method and increase of facilities and material cost is influenced by the steel unit price. Therefore, it is important to examine the influence which the rate of each cost of construction at the building cost gives to the design. In this study, the influence of design variables in the optimization of the midship section of bulk carrier is also investigated and the material cost and assembling costs of the optimized design plan is reported. The genetic algorithm is adopted as an optimization method.
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